Sydenham (County Antrim) weather
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Forecast days
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Today. Maximum daytime temperature: 19 degrees Celsius; Minimum nighttime temperature: 12 degrees Celsius. Cloudy changing to sunny intervals in the afternoon. Sunrise: ; Sunset: . UV: Moderate; Pollution: Low; Pollen: Low.Today. Maximum daytime temperature: 19 degrees Celsius; Minimum nighttime temperature: 12 degrees Celsius. Cloudy changing to sunny intervals in the afternoon. Sunrise: ; Sunset: . UV: Moderate; Pollution: Low; Pollen: Low.
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Monday 13 May. Maximum daytime temperature: 14 degrees Celsius; Minimum nighttime temperature: 12 degrees Celsius. Cloudy changing to light rain by lunchtime. Sunrise: ; Sunset: . UV: Moderate; Pollution: Low; Pollen: Low.Monday 13 May. Maximum daytime temperature: 14 degrees Celsius; Minimum nighttime temperature: 12 degrees Celsius. Cloudy changing to light rain by lunchtime. Sunrise: ; Sunset: . UV: Moderate; Pollution: Low; Pollen: Low.
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Tuesday 14 May. Maximum daytime temperature: 15 degrees Celsius; Minimum nighttime temperature: 11 degrees Celsius. Cloudy changing to light rain by late morning. Sunrise: ; Sunset: . UV: Moderate; Pollution: Low; Pollen: Low.Tuesday 14 May. Maximum daytime temperature: 15 degrees Celsius; Minimum nighttime temperature: 11 degrees Celsius. Cloudy changing to light rain by late morning. Sunrise: ; Sunset: . UV: Moderate; Pollution: Low; Pollen: Low.
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Wednesday 15 May. Maximum daytime temperature: 17 degrees Celsius; Minimum nighttime temperature: 11 degrees Celsius. Sunny intervals. Sunrise: ; Sunset: . UV: High; Pollution: Low; Pollen: Low.Wednesday 15 May. Maximum daytime temperature: 17 degrees Celsius; Minimum nighttime temperature: 11 degrees Celsius. Sunny intervals. Sunrise: ; Sunset: . UV: High; Pollution: Low; Pollen: Low.
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Thursday 16 May. Maximum daytime temperature: 18 degrees Celsius; Minimum nighttime temperature: 10 degrees Celsius. Sunny changing to light showers by lunchtime. Sunrise: ; Sunset: . UV: High; Pollution: Low; Pollen: Low.Thursday 16 May. Maximum daytime temperature: 18 degrees Celsius; Minimum nighttime temperature: 10 degrees Celsius. Sunny changing to light showers by lunchtime. Sunrise: ; Sunset: . UV: High; Pollution: Low; Pollen: Low.
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Friday 17 May. Maximum daytime temperature: 16 degrees Celsius; Minimum nighttime temperature: 9 degrees Celsius. Sunny intervals changing to cloudy by late morning. Sunrise: ; Sunset: . UV: High;Friday 17 May. Maximum daytime temperature: 16 degrees Celsius; Minimum nighttime temperature: 9 degrees Celsius. Sunny intervals changing to cloudy by late morning. Sunrise: ; Sunset: . UV: High;
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Saturday 18 May. Maximum daytime temperature: 16 degrees Celsius; Minimum nighttime temperature: 10 degrees Celsius. Sunny intervals. Sunrise: ; Sunset: . UV: Moderate;Saturday 18 May. Maximum daytime temperature: 16 degrees Celsius; Minimum nighttime temperature: 10 degrees Celsius. Sunny intervals. Sunrise: ; Sunset: . UV: Moderate;
Seven day forecast for Sydenham
| Time | 13:00 | 14:00 | 15:00 | 16:00 | 17:00 | 18:00 | 19:00 | 20:00 | 21:00 | 22:00 | 23:00 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Weather symbols |
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Chance of precipitation
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<5% | 10% | 10% | <5% | <5% | <5% | <5% | <5% | <5% | <5% | <5% |
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18°
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18°
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18°
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18°
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19°
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19°
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18°
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17°
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16°
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14°
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13°
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17° | 17° | 17° | 17° | 18° | 17° | 17° | 16° | 15° | 13° | 13° |
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SSE
8
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SSE
8
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SSE
8
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SSE
7
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S
7
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S
9
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S
7
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S
8
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SSE
6
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SE
6
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SE
6
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12 | 12 | 12 | 11 | 11 | 13 | 10 | 10 | 8 | 8 | 8 |
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G | M | G | G | G | G | M | M | M | M | M |
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Humidity
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69% | 69% | 69% | 67% | 66% | 65% | 68% | 72% | 78% | 84% | 87% |
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UV
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5 | 5 | 4 | 4 | 3 | 2 | 1 | 1 | 1 | - | - |
| Time | 00:00 | 01:00 | 02:00 | 03:00 | 04:00 | 05:00 | 06:00 | 07:00 | 08:00 | 09:00 | 10:00 | 11:00 | 12:00 | 13:00 | 14:00 | 15:00 | 16:00 | 17:00 | 18:00 | 19:00 | 20:00 | 21:00 | 22:00 | 23:00 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Weather symbols |
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Chance of precipitation
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<5% | <5% | 10% | 10% | 10% | 10% | 10% | 10% | 10% | 10% | 10% | 10% | 50% | 10% | 40% | 80% | 80% | 80% | 90% | 90% | 90% | 80% | 50% | 50% |
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13°
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13°
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12°
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12°
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12°
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12°
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12°
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12°
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12°
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13°
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13°
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13°
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13°
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14°
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13°
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13°
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13°
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13°
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13°
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13°
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13°
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13°
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13°
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13°
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12° | 12° | 12° | 11° | 11° | 11° | 10° | 10° | 11° | 11° | 11° | 11° | 11° | 12° | 12° | 11° | 11° | 11° | 11° | 11° | 11° | 11° | 11° | 12° |
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SE
6
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SE
5
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SE
6
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SE
6
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SE
7
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SE
8
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SE
9
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SE
9
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SSE
10
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SE
10
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SE
10
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SE
11
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SE
11
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SE
11
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ESE
11
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ESE
10
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ESE
10
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ESE
11
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ESE
11
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ESE
11
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ESE
10
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ESE
10
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SE
9
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SE
7
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8 | 8 | 8 | 10 | 12 | 13 | 15 | 16 | 16 | 16 | 18 | 19 | 19 | 20 | 19 | 18 | 18 | 19 | 19 | 19 | 19 | 19 | 17 | 12 |
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M | M | M | M | M | M | M | G | G | G | G | G | G | G | G | M | M | M | M | M | M | M | G | G |
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Humidity
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90% | 93% | 93% | 94% | 94% | 93% | 93% | 90% | 87% | 85% | 82% | 81% | 80% | 79% | 81% | 85% | 87% | 89% | 90% | 91% | 92% | 92% | 94% | 94% |
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UV
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- | - | - | - | - | - | 1 | 1 | 1 | 2 | 2 | 2 | 2 | 3 | 2 | 2 | 2 | 1 | 1 | 1 | 1 | 1 | - | - |
| Time | 00:00 | 01:00 | 04:00 | 07:00 | 10:00 | 13:00 | 16:00 | 19:00 | 22:00 |
|---|---|---|---|---|---|---|---|---|---|
| Weather symbols |
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Chance of precipitation
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50% | 50% | 50% | 10% | 40% | 80% | 50% | 50% | 20% |
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13°
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12°
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12°
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12°
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13°
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13°
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14°
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14°
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13°
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12° | 12° | 11° | 11° | 12° | 13° | 13° | 13° | 12° |
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SE
7
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SE
6
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SE
5
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ESE
4
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ENE
6
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ENE
6
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ENE
6
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ENE
6
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E
6
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12 | 11 | 9 | 7 | 9 | 10 | 12 | 11 | 10 |
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G | G | G | M | M | M | G | M | G |
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Humidity
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95% | 95% | 95% | 95% | 90% | 89% | 90% | 90% | 94% |
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UV
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- | - | - | 1 | 2 | 3 | 2 | 1 | - |
| Time | 01:00 | 04:00 | 07:00 | 10:00 | 13:00 | 16:00 | 19:00 | 22:00 |
|---|---|---|---|---|---|---|---|---|
| Weather symbols |
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Chance of precipitation
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10% | 10% | 10% | <5% | <5% | <5% | <5% | <5% |
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12°
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11°
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12°
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14°
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16°
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16°
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16°
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13°
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11° | 11° | 11° | 13° | 14° | 15° | 16° | 13° |
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E
5
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ESE
5
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E
5
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ESE
9
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ESE
9
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ESE
8
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E
5
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NE
4
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9 | 9 | 9 | 16 | 17 | 16 | 10 | 7 |
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G | G | G | VG | VG | VG | VG | VG |
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Humidity
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94% | 94% | 94% | 84% | 75% | 71% | 72% | 87% |
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UV
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- | - | 1 | 3 | 6 | 4 | 1 | - |
| Time | 01:00 | 04:00 | 07:00 | 10:00 | 13:00 | 16:00 | 19:00 | 22:00 |
|---|---|---|---|---|---|---|---|---|
| Weather symbols |
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Chance of precipitation
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<5% | <5% | <5% | <5% | 30% | 30% | <5% | <5% |
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12°
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11°
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12°
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16°
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17°
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17°
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17°
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13°
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11° | 11° | 12° | 15° | 16° | 16° | 16° | 12° |
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NW
3
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WNW
3
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W
3
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NNE
4
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E
6
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ESE
7
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E
5
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NNW
6
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5 | 5 | 5 | 9 | 12 | 14 | 11 | 10 |
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VG | G | G | VG | VG | VG | VG | M |
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Humidity
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90% | 90% | 90% | 78% | 72% | 66% | 66% | 88% |
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UV
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- | - | 1 | 4 | 6 | 4 | 1 | - |
| Time | 01:00 | 04:00 | 07:00 | 10:00 | 13:00 | 16:00 | 19:00 | 22:00 |
|---|---|---|---|---|---|---|---|---|
| Weather symbols |
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Chance of precipitation
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<5% | <5% | <5% | 10% | <5% | <5% | <5% | <5% |
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12°
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11°
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12°
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14°
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15°
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15°
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14°
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11°
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11° | 10° | 10° | 12° | 13° | 13° | 11° | 9° |
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NW
6
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NW
8
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NNW
10
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NNW
11
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NNW
12
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NNW
13
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NNW
13
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NNW
11
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10 | 12 | 16 | 20 | 21 | 22 | 22 | 18 |
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G | M | VG | VG | VG | VG | VG | VG |
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Humidity
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90% | 91% | 88% | 78% | 69% | 67% | 69% | 77% |
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UV
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- | - | 1 | 4 | 6 | 4 | 1 | - |
| Time | 01:00 | 04:00 | 07:00 | 10:00 | 13:00 | 16:00 | 19:00 | 22:00 |
|---|---|---|---|---|---|---|---|---|
| Weather symbols |
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Chance of precipitation
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<5% | <5% | <5% | <5% | <5% | <5% | <5% | <5% |
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10°
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10°
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10°
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13°
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15°
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15°
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15°
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13°
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8° | 8° | 9° | 11° | 13° | 14° | 13° | 11° |
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NW
9
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NW
9
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NW
8
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NW
9
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NW
10
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NNW
10
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NNW
10
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NW
8
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15 | 14 | 13 | 16 | 18 | 18 | 17 | 13 |
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VG | VG | VG | VG | VG | VG | VG | VG |
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Humidity
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86% | 87% | 85% | 77% | 70% | 68% | 70% | 80% |
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UV
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- | - | 1 | 3 | 5 | 3 | 1 | - |
Our weather symbols tell you the weather conditions for any given hour in the day or night. This means that the symbol for 9am shows you what you will see from 9am to 10am.
Chance of precipitation represents how likely it is that rain (or other types of precipitation, such as sleet, snow, hail or drizzle) will fall from the sky at a certain time.
This number shows the air temperature for the time period. You can see the temperature in Celsius or Fahrenheit by using the dropdown menu.
Feels like temperature considers other factors, such as wind speed and humidity. This gives you a better idea of how the temperature will actually feel at the time.
Wind gust shows the highest wind speed that you should encounter at that time, as winds peak and lull.
Strong winds are shown in bold for speeds of 29 mph or more.
The arrow shows the direction the wind is blowing. The letters show the direction the wind is blowing from (on a standard 16-point compass).
The number represents the average wind speed expected at that time.
The arrow shows the direction of the wind (up is north). If the arrow points from land to sea, the wind will be blowing out to sea (‘offshore’). The number is the average wind speed.
Beware of offshore winds if you are using inflatables, paddle boards or kayaks. These winds can blow you out to sea. Read more about how wind will affect you at the beach.
Visibility measures the distance at which an object can be clearly seen.
| VP (Very Poor) | Less than 1 km |
| P (Poor) | 1.1 km to 4 km |
| M (Moderate) | 4.1 km to 10 km |
| G (Good) | 10.1 km to 20 km |
| VG (Very Good) | 20.1 km to 40 km |
| E (Excellent) | Greater than 40 km |
Humidity is the amount of water vapor in the air. If there is a lot of water vapour, the humidity will be high. The higher the percentage of humidity, the wetter it will feel outside.
UV exposure index and the protection required to help keep you safe:
No risk of UV - It’s safe to stay outside. Low - You can safely stay outside. Consider sunscreen in direct sunlight. Moderate - Take care during midday hours and do not spend too much time in the sun unprotected. Sunscreen advised. High - Seek shade during midday hours, cover up and wear sunscreen. Very high - Spend time in the shade between 11am and 3pm. Shirt, sunscreen and hat are essential. Extreme - Avoid being outside during midday hours. Shirt, sunscreen and hat essential.
This is the average height of the waves, 1-2 miles out to sea. The height of the waves can vary. The individual waves out to sea or at the beach can be higher than this number. If you are close to the water, keep an eye on the waves to stop you or your belongings being swept away.
Read more about calculating the expected height of the waves at the beach.
This is the average number of seconds between one wave and the next, 1-2 miles out to sea. A long wave period (more than 10 seconds) means the waves at the beach may be more powerful. Lifeguards can give you advice on waves if you’re planning to go into the water.
Read more about the period of waves.
The arrow shows the average direction of the waves 1-2 miles out to sea. It indicates how sheltered the beach will be from these waves. If the arrow points towards land, most of the waves’ power will reach the beach. If the arrow is parallel to or pointing away from land, the wave height is likely to be lower on the beach than it is offshore.
Lifeguards can give you advice on waves if you’re planning to go into the water.
Forecast row information
UK video forecast
Northern Ireland weather forecast
Headline:
Sunday starting dry, bright. Heavy showers developing, especially in west.
Today:
Dry and bright start but scattered showers soon developing in the west. These showers will become heavy and possibly thundery by afternoon, gradually extending eastwards later. Maximum temperature 22 °C.
Tonight:
Cloudy with any lingering showers soon dying out. Then a few clearer spells possible before low cloud spreads in through the early hours, with coastal fog in places. Minimum temperature 9 °C.
Monday:
A dry but cloudy start on Monday. Persistent and at times heavy rain pushes north through the afternoon, lasting through the evening. Maximum temperature 16 °C.
Outlook for Tuesday to Thursday:
Persistent and a times heavy rain on Tuesday will gradually ease through the evening. Generally brighter Wednesday and Thursday with scattered afternoon showers developing between sunny spells.
Updated:
UK long range weather forecast
Changeable with showers developing by day across the UK during the latter part of the week and over the weekend. The heaviest showers and greatest risk of thunderstorms across southern parts. Temperatures generally around or just a little above average, though with winds tending to be light, still feeling warm in sunnier areas. Over the weekend there are signs that showers may start to ease from the north with drier, more settled conditions probably becoming established for a time. Confidence lowers into the following week with signals unclear how prolonged the influence of higher pressure will be. So after a potentially more settled spell of weather, unsettled conditions are likely to return during the week with the wettest conditions in the west. Above average temperatures more likely than below.
Updated:
Signals during this period are weak and offer limited guidance beyond climatology. Similar weather conditions to those of the preceding few days are most likely to characterise this period to the end of May; a mixture of unsettled periods with rain and showers and settled interludes in-between. By early June, the chances of above and below average rainfall are evenly balanced. There is a slightly higher likelihood of above average temperatures compared with below average temperatures, such that the chance of hot spells, although still very small, is slightly higher than normal too.
Updated:
