It's still very warm in the east today but the change back to cooler weather is underway from the west.
After the wonderful weather over the Bank Holiday, a change is on the way, but much of the day will still be fine over central and eastern England, where high U.V and pollen levels are likely once again.
Early mist and patchy fog soon clear, to leave much of England and East Wales with another fine morning. Hazy sun quickly lifts temperatures making it very warm or hot again in central and eastern areas by the afternoon where some cloud will develop later. This could produce a few sharp showers possibly with thunder, but many places will stay dry. Further West it's a different story, with mist and low cloud extensive across the South West, the South and West of Wales and around Irish Sea coasts. This'll persist for a while, before bursts of rain already over parts of Northern Ireland, move into North West England, parts of Wales and Scotland through the day. Further South any rain should be light and patchy, with Northern Ireland seeing clearer, fresher weather moving in by early afternoon, this spreading to some other more western areas later.
It'll quickly become very warm or hot in central and eastern areas, where temperatures will reach 25 to 28C. Further West it'll turn somewhat cooler and fresher through the day, as West or South Westerly breezes move in. Here 18 to 21C is more likely, with temperatures getting no higher than 12 to 14C where it remains grey for much of the day.
Eastern areas see patchy cloud into the evening where there's the risk of catching a sharp shower, even a thunderstorm. Many places should stay dry though, with clearer, fresher weather moving in from the West overnight, although Norfolk, Suffolk and Kent may keep some cloud.
Elsewhere apart from a few showers towards Highland and across the Northern Isles, clearing skies and light winds will allow it to turn chilly in rural areas as temperatures fall to between 5 and 9C. Across East Anglia and the South East, however, the thermometer will probably sink no lower than 10 to 12C. Towards morning, Northern Ireland will see increasing cloud, as a southerly wind begins to freshen.
Cloud and the odd shower could still be affecting some places towards North Sea coasts, but this should eventually move away. Most of England, Wales and East Scotland though will start Wednesday dry and bright with some sunshine. It should remain this way for most of the day across much of the Midlands and eastern England, but with increasing cloud. Elsewhere cloud and eventually outbreaks of rain will arrive, with some heavy bursts over Cumbria and the North and West of Scotland during the afternoon. Across Northern Ireland after a wet morning, the rain should clear during the afternoon to leave sunny intervals and a few showers, these mostly over Derry and towards Donegal.
Light winds in the East at first freshen from the South, with Northern Ireland and West Scotland perhaps becoming quite blustery later. Although still pleasantly warm in the East with highs of around 20 or 21C, it'll feel noticeably cooler and fresher everywhere. As a result, top temperatures of 13 or 14C over Northern Ireland and Scotland and 16 to 18C in the West will be down on recent values.
Many eastern areas could still be dry into the evening, but cloud will bring some wet weather after dark, much of it probably light and patchy in the South. Elsewhere after some rain, the weather will improve from the West to leave clearing skies. It'll also become mainly dry, apart from a few showers over Cumbria, western Scotland and Northern Ireland. Here a South West wind will be moderate or fresh, with lighter breezes elsewhere probably from the West or North West towards the South East. Although feeling fresh, it's not expected to be a cold night, with lowest temperatures mostly in the range 5 to 9C.
