Despite a change to much fresher, cooler weather over the past few days, many places are still desperately in need of rain. Parts of the East Midlands, in particular, have seen little if any rain so far this month although most places should at least catch a shower today.
After a chilly start, the Midlands, East Anglia and the South East together with Moray and Aberdeenshire have the best of the sunshine at first. There are already showers though particularly around the Severn Estuary, over northern England, and in the West and they'll become more widespread through the morning. Some will be heavy and perhaps lengthy giving thunder in places by the afternoon. Between times there'll be sunny intervals, with the showers probably tending to become lighter and fewer over Northern Ireland later.
A mostly moderate South West wind will be gusty in heavier showers, and it'll feel fresh everywhere. As a result, temperatures over most of Scotland and Northern Ireland will get no higher than 13 to 16C, with 18 to 22C more likely over parts of the East and South which is on the chilly side for August.
There'll continue to be a few showers 'dotted' about into the evening, but they'll fade to leave a dry night in most parts with clearing skies. As winds become light, it'll turn quite chilly with temperatures across the country falling into single figures quite widely. A few short-lived mist patches could also form towards dawn, when it may have turned cold enough even for a touch of grass frost in a few sheltered Scottish glens. More generally though, lowest temperatures will be between 4 and 7C in northern and some central areas and 7 to 11C further South. The exception will be the South West where you'll keep more cloud, with the Channel Isles seeing patchy rain or drizzle but here it'll be milder.
Tomorrow sees frontal systems moving in from the South West, after a fine if though chilly start in most places.
Morning sunshine will soon lift temperatures, but cloud in the South West will work its way slowly North and East through the day, bringing some rain to central southern England, much of Wales and Northern Ireland later. Elsewhere apart from isolated showers, it should stay dry, but probably with more in the way of cloud later after a fine morning. Light winds at first will freshen a little from the South or South East, become blustery across Northern Ireland, the Isle of Man and in the West later, with top temperatures 14 to 17C in the North and West and 19 to 23C in the East and South East.
Much of Scotland should have a dry evening and night, with any showers soon fading. It'll turn chilly again particularly in sheltered Highland glens, as temperatures fall to mostly between 5 and 8C. Across England, Wales and Northern Ireland, it'll be more cloudy and unsettled with showery bursts of rain, especially in the West. Southern parts though may see a few breaks in the cloud sheet at times.
Winds will be light over Scotland and from a southerly quarter elsewhere, with the West and South West probably quite blustery at times. South of the Scottish border though it'll be a milder night, with minimum temperatures mostly in the range 9 to 14C.
It'll remain unsettled into the working week with occasional rain or showers, especially in the North. There are signs though of another finer, very warm spell developing across the East and South towards next weekend.