The Met Office issued yellow weather warnings from Monday afternoon up to Wednesday.
Temperatures will still be high reaching up to 31 degrees Celsius.
On the Met Office website it said: “Some places are likely to see severe thunderstorms early next week.
“There is a small chance that homes and businesses could be flooded quickly, with damage to some buildings from floodwater, lightning strikes and large hail.
“Where flooding or lightning strikes occur, there is a chance of delays and some cancellations to public transport.
“Spray and sudden flooding could lead to difficult driving conditions and increased chance of accidents.
“There is a slight chance that power cuts could occur and other services to some homes and businesses could be lost.”