Temperatures are set to hit 28C for the first week of Wimbledon - but forecasters are also warning of more flash floods.
The week will get off to a dry start but the Environment Agency has issued five flood warnings, four in the North East and one in the North West.
With the ground already saturated after a month of wet weather, the flooding risk when the rain returns will be higher than normal, forecasters said.
Downpours and thunderstorms across northern England, Scotland and parts of Wales are predicted for Thursday.
However, parts of Britain should expect temperatures to rise to 28C on either Wednesday or Thursday, before any rain.
As the tennis tournament moves into its second week, it will be slightly cooler, with bands of rain coming at roughly 12-hour intervals.
Cumbria, Lancashire and West Yorkshire suffered widespread flooding on Friday night, but river levels have since dropped.
In some places, a month's rain fell in 24 hours, leaving hundreds of homes swamped in dirty water.
It prompted forecasters to say the country could be on course for one of the wettest Junes of the past 100 years.
The River Yarrow burst its banks in Croston, flooding around 70 homes, which had to be evacuated.
Sky News weather presenter Isobel Lang said: "There will be some heavy rain around this week, especially in western and northwestern parts, with the risk of some local flooding.
"However, this should move through quite quickly and therefore not bring the extreme totals of last week.
"On a more cheery note, it will turn warmer as we draw in more humid air from the near continent.
"Thursday is set to be the warmest day of the week with a high of around 28C (82F).
"The warmth isn't expected to last into the coming weekend though as low pressure sweeps in to bring a mix of sunshine, blustery showers and below average temperatures."