Wales will cloud over from the west during the late afternoon and evening and showers will develop, mainly over the hills. It will stay quite cloudy and mild overnight, with one or two more showers. Minimum temperature 12 °C.
Showers will become more widespread and heavy during Wednesday. There will be sunny spells too, especially in Cardiff and the southeast, which may avoid the showers altogether. Maximum temperature 20 °C.
Outlook for Thursday to Saturday:
After some rain in northwest Wales on Thursday, dry and bright weather will dominate the country. It will become warm into the weekend.
UK long range weather forecast
Sunday is expected to be dry, bright and warm across most of the UK. Temperatures will be well above average across the southeast, but remain closer to normal in the northwest. The odd shower is possible but most people won't see one. On Monday (the Bank Holiday except in Scotland), warm dry weather is expected again in the south and east, but it may be wetter and windier in the far northwest. In the following days, dry warm weather may well continue in the south and east, though there is a risk of some thundery showers moving up from the near continent. Northern parts of the UK may see further spells of wet and windy weather, though some drier warmer spells are likely here too.
Confidence remains rather low during this period. Southern areas are most likely to see the driest and sunniest weather in the early days of September, perhaps with some lingering wet and windy conditions affecting the north. However, longer spells of dry and sunny weather may occasionally develop across all parts. Temperatures are generally likely to be warmer than average, although there is little indication of anything exceptional at this time.