However, as sunny skies develop more widely, the combination of strong sunshine and light winds will help temperatures to peak on either Wednesday or Thursday, and be the highest of the year so far in each of the four nations.
23C is the expected high in parts of Scotland and Northern Ireland, 25C in Wales and 27C in England.
London, the Home Counties and Cambridgeshire are the areas expected to record the warmest of the conditions.
With sea temperatures around the UK still relatively low at the moment, coastal areas where sea breezes develop will feel cooler, but UV levels will remain high.
