Digital Map Data:
© Collins Bartholomew Ltd (2006)
Postcode information:
© Royal Mail Group PLC (2006)
Snowdonia: forecast temperature
Saturday, 25 May 2013: dawn to dusk
Printable view Forecast issued: 0335 on Saturday, 25 May 2013
Overview for Saturday
After a cold start, it will become a dry and fine day with some good spells of sunshine developing, particularly later in the afternoon on coastal hills.
| Hazards | Risk | Explanation |
|---|---|---|
| Blizzards | No Risk | |
| Heavy snow | No Risk | |
| Storm force winds | No Risk | |
| Gales | No Risk | |
| Severe chill effect | No Risk | |
| Persistent and extensive hill fog | No Risk | |
| Thunderstorms | No Risk | |
| Heavy persistent rain | No Risk | |
| Strong Sunlight | Medium | Given the prolonged sunny periods and the time of year, risk of sunburn during the day. |
key to hazards and forecast content
| Dawn to 0900 | 0900 to 1200 | 1200 to 1500 | 1500 to dusk |
 Cloudy |
 Sunny intervals |
Sunny intervals |
 Sunny |
| 0% | 0% | 30% | 10% |
Detailed mountain weather forecast: Snowdonia
Saturday
Weather
Some early valley mist and low cloud will soon clear leaving a dry and bright day with prolonged sunny spells, particularly later in the day and across coastal hills. Small risk of a light passing shower during the late morning and early afternoon period. Easterly winds will be much lighter and it will feel warmer than of late.
Visibility
Generally very good or excellent, but poor in any mist and very poor in hill fog first thing.
Hill fog
Low cloud may well shroud some of the mountains through the early morning period. However, this will soon lift and disperse with summits becoming cloud free into the afternoon.
Maximum winds above 500m
Generally easterly 10-20mph, but sea breezes will affect wind direction on coastal hills.
Temperature
| Valleys | Plus 2 becoming 15 Celsius |
| 900 m | Plus 1 becoming 5 Celsius |
| Freezing level | Above the summits, but locally frosty through the valley floors around dawn. |
Sunday
Weather
Early valley mist will clear to leave another dry and bright day with some sunny spells developing, especially across eastern hills. However, always more in the way of cloud across western hills, especially in the morning. This cloud may well be thick enough for a shower or two in the afternoon.
Visibility
Generally good or very good, but poor in any mist and very poor in hill fog first thing.
Hill fog
Low cloud will affect western hills through the morning resulting in extensive hill fog, especially on coastal hills. However, this should lift and disperse through the afternoon, with many summits becoming cloud free, but some cloud may shroud coastal hills and highest summits at times.
Maximum winds above 500m
Southwesterly 10-20mph.
Temperature
| Valleys | Plus 2 becoming 15 Celsius |
| 900 m | Plus 3 becoming 6 Celsius |
| Freezing level | Above summits, but locally frosty through sheltered valleys around dawn. |
Outlook
Monday
Turning cloudier and more unsettled with a band of rain arriving from the west during the morning, this may well be heavy at times and continue into the afternoon. Winds will increase markedly during the morning with widespread upland gales developing, easing later in the day.
Tuesday
Remaining unsettled through Tuesday with sunshine and showers, some of which may well be on the heavy side with the risk of thunder. Moderate southeasterly southeasterly winds, becoming fresh to strong southwesterly later.
Wednesday
The showery theme will continue as low pressure dominates the weather pattern. Some of the showers will again be on the heavy side with the risk of the odd rumble of thunder. The winds are likely to strengthen through the afternoon.
Observations
Webcams
The Met Office is not responsible for the content of external sites. If you would like to consider adding a link to your webcam, please contact us.
The Enhanced Mountain forecast for Snowdonia has been discontinued. All forecast information for these locations can be found in the standard Mountain forecast above.
RSS warnings and alerts
Regional warning and alert feeds
Weather gadgets
Vista weather gadget
Firefox weather gadget
Related internet links
Avalanche Information for Scotland
The Met Office is not responsible for the content of external internet sites.
