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Sunday is off to a fine start in southern and central regions but in the north there is more cloud. Through the day patchy outbreaks of rain affect central and northern Scotland at times. Elsewhere there will be sunny periods with the best of them in the south.

Temperatures range from 15C (59F) in western Scotland to 30C (86F) in the south. See the rain and lightning radar for the latest view

Meteo France Arpege, forecast cloud cover, 16:00 BST Sun 5th August

Forecast short cuts

The month ahead - August

Winter 2018/19 weather

Tonight more persistent spells of rain spread eastwards across much of Scotland and possibly into Northern Ireland. Elsewhere it remains dry with clear periods and in the south it stays very muggy.

Tomorrow the hot and sunny weather continues in southern and central regions. In the north thicker cloud bring some patchy rain but brighter and cooler conditions follow on into western Scotland and Northern Ireland. In the south temperatures could reach a hot and humid 32C (90F).

Meteo France Arpege, forecast temperatures, 16:00 BST Mon 6th August

Cooler weather spreading southwards

Tuesday brings more hot weather to the south but the risk of thunderstorms increases through the day. Northern regions will be cooler and there could be some patchy rain. During Wednesday the cooler air continues to push down from the northwest but the southeastern corner may still be very warm or hot. 

During the rest of the week weather systems in the Atlantic affect the UK's weather in a way they haven't done for much of the summer. Temperatures in all of the UK are expected to become close to the seasonal average and by the weekend there is a risk of more prolonged periods of rain in all regions. 

GFS, forecast pressure and precipitation, 16:00 BST Fri 10th August

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Meteo France Arpege forecast charts

Global Forecast System (GFS) forecast charts

16 day GEFS ensembles at a glance

Mostly dry and very warm weather is show in the south during the first week but there is a greater risk of rain in the north. Beyond that cooler conditions are favoured and there is an increasing chance of more changeable spells, particularly in the north. View latest GEFS.