The Met Office has issued a yellow weather warning for thunderstorms and torrential downpours.
As a result of an influx of cooler Atlantic air, the mercury is predicted to drop across Scotland, Wales, Northern Ireland and the majority of England. Wednesday will see highs of 28C to 29C, but the hot weather across England will be replaced by "thundery showers" on Thursday.
The Met Office expects the thunderstorms to hit the North West of England - with Cheshire most affected.
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The Met Office said: "Thunderstorms are likely to break out in some areas, particularly during the afternoon and early evening. While most places will probably miss them, where thunderstorms do occur there is a chance that in a few places up to 40 mm of rain could fall in an hour or so and 40 to 60 mm could fall in two or three hours.
"These torrential downpours may be accompanied by frequent lightning, whilst gusty winds and hail may also affect a few places. The exact location of the thunderstorms will be hard to pinpoint, so the warning area will be kept under review and updated if necessary."
The weather warning is in place from 10am on Thursday to 11.59pm.
What to expect
- There is a small chance that homes and businesses could be flooded quickly, with damage to some buildings from floodwater, lightning strikes, hail or strong winds
- There is a small chance of fast flowing or deep floodwater causing danger to life
- Where flooding or lightning strikes occur, there is a chance of delays and some cancellations to train and bus services
- Spray and sudden flooding could lead to difficult driving conditions and some road closures
- There is a slight chance that power cuts could occur and other services to some homes and businesses could be lost
- There is a small chance that some communities become cut off by flooded roads
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