UK weather: High temperatures forecast in parts of England but cooler weather elsewhere
In England, seven areas have been issued with amber heat health alerts: Yorkshire and the Humber, East Midlands, West Midlands, East of England, London and both south England regions.
The warnings indicate public services like hospitals and transport could be significantly impacted. Meanwhile, London Ambulance Service has urged people to take extra precautions to deal with the heat.
A less serious yellow heat health alert is in place for north west England.
Tuesday's temperatures come after a sweltering end to June, with London Heathrow recording a temperature of 33.1C on Monday.
It was a very warm night across many parts of the country with temperatures staying in the mid to high teens.
It is likely some parts of East Anglia and south-east England will have had a "tropical night," which occurs when the temperature does not fall below 20C.
Tuesday night will be a more comfortable night for sleeping across most areas except the south-east, where it will stay very warm for most of the night.
By Wednesday, the heatwave will be over across the UK with temperatures in the south-east falling to the mid-20s - at levels more typical for the beginning of July.
There will be some heavy showers across the far south-east of England, north-east England and eastern Scotland.
Wimbledon in particular will welcome the respite after the hottest start to the tennis tournament on record with tennis players seen holding ice bags on their heads to keep themselves cool.
This is the second UK heatwave of 2025.
The highest temperature of the year so far was recorded on 21 June in Charlwood, Surrey. However, this temperature is likely to be exceeded on Tuesday.
An official heatwave is declared when locations reach a certain temperature for three consecutive days. The thresholds vary from 25C to 28C in different parts of the country.
While this heatwave is a result of a large area of high pressure getting "stuck" over Europe – dubbed a "heat dome" by some - high temperatures are becoming increasingly common in the UK.
Scientists have emphasised the role of climate change in these sizzling summers, saying that heatwaves will likely become more frequent and hotter in the future.
