Six people have been killed by the fires, which are some of the largest in state history.
Large swathes of England and Wales are covered by yellow weather warnings for the entire weekend.
The Met Office warns "severe thunderstorms" could cause flash flooding across parts of England over the next few days.
The mercury could once again rise to 35C on Sunday in some parts of the UK.
Thunderstorms swept across London, the south of England, Wales and the Midlands on Tuesday, with some areas hit by a week’s rain in just an hour.
A yellow weather warning is in place until Wednesday night as rain causes flooding and landslides in Scottish Highlands.
Forecasters warned of the potential for up to 40mm of rain to fall in just an hour or two on Sunday afternoon.
Communities across North Yorkshire have been affected by the summer storms, which saw nearly a month's worth of rain fall within 24 hours.
Thunder and lightning are expected to continue this week ⛈