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Forecasters said the biggest downpours this Easter are most likely to be in southern and western parts of the UK, although these areas could also see some drier and brighter spells.
The UK was hotter than many European holiday hotspots including Corfu which hit 17C (63F) today, while Menorca was 16C (61F), Madrid 15C (59F) and Nice 14C (57F).
The Met Office has issued the warning which will come into place at 11am tomorrow and last the rest of the day.
Londoners could see temperatures reach up to 16°C by the end of the week.
The Met Office said conditions will 'feel more like spring' from tomorrow as winds from the Azores bring warmer air, especially to the Midlands and South East England.