A weather warning for thunderstorms has been issued by the Met Office.
Issued for Tuesday evening, it comes as Wales is expected to experience the with temperatures of around 32°C.
It is warning of scattered thunderstorms moving north on Tuesday night and early on Wednesday morning affecting most of Wales and a large part of the UK.
The chief forecaster said: "Scattered thunderstorms are expected to affect parts of south-west and southern England this evening, moving north quickly across the UK overnight, clearing Scotland and eastern England by mid-morning on Wednesday.
"Although some places will miss the thunderstorms altogether, where they do occur there is the potential for frequent lightning, hail and gusty winds, as well as sudden downpours in a few places."
The warning, which is in place from 6pm on Tuesday until 9am on Wednesday, also says:
- 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 of damage to property from lightning strikes, hail or strong winds
- There is a small chance of a few homes and businesses likely, leading to some damage to buildings or structures
- There is a small chance driving conditions will be affected by spray, standing water and/or hail, leading to longer journey times by car and bus
Wales is on track for the hottest day of the year so far with highs of 32°C before thunderstorms move in overnight.
The Met Office has said a three-day heatwave is expected across the UK with highs of 36°C in some parts of the UK by Thursday.
The sweltering heat is the result of an 'African plume' sweeping in from the south and there will be high temperatures across Europe too.
