The hottest day of the year has already been recorded on Tuesday as Londoners continue to bake in sweltering heat.
Frittenden in Kent reached 33.6C, at 11.19am, while temperatures at Heathrow Airport have reached 33.2C.
Both temperatures beat Monday's peak of 33.1C also recorded at Heathrow
It is expected to get hotter with forecasters predicting temperatures of 34C or even higher for the capital- and even 35C elsewhere.
The scorching forecast came as Britons endured a miserable sleep during the warmest night of the year so far.
Parts of capital saw temperatures no lower than 23C through the night. It was what meteorologists describe as a “tropical night” - when the mercury doesn’t drop lower than 20C - which are more commonly found in the Mediterranean and Caribbean.
And the heatwave is continuing on Tuesday, with Met Office weather charts showing the mercury is set to hit 34C (92F) by mid-afternoon.
See also: London can't cope with the heat — here's why
Meanwhile, amber heat health alerts have been extended by the UK Health Security Agency for swathes of England, including London, until 9am on Wednesday.
The agency has also warned of significant impacts across health and social care services.
The UKHSA urged people to check vulnerable groups, particularly the elderly, and take "sensible precautions while enjoying the sun".
Tennis fans bathed in the sunshine on Monday as Wimbledon got under way, with its warmest opening day ever.
A temperature of 32.3C (90.1F) was recorded at Kew Gardens, west London — the nearest observation site to the All England Club — setting a provisional record for the hottest start to The Championships.
It surpassed the previous record of 29.3C (84.7F) set on day one of tournament in 2001.
The heat on Monday was too much for one spectator who collapsed during Carlos Alcaraz’s first-round victory against Italy’s Fabio Fognini on Centre Court.
After 4 sets of tennis in a heatwave, Carlos Alcaraz still makes the effort to help when a fan is unwell in the stands—checking on them and running to get water.
— Daily Alcaraz (@alcarazdaily) June 30, 2025
Moments like these show what kind of person he is. 🤍
pic.twitter.com/eQ3DBjt8Y6
However, cooler conditions are set to return by Wednesday, bringing the chance of thundery downpours later in the week.
The hottest day of 2025 so far was recorded on June 21 in Charlwood near London Gatwick Airport when temperatures hit 33.2C (91.8F).
Thomas Goodall, assistant commissioner of the London Fire Brigade, has warned of wildfires in the capital during the hot spell and urged the public to “act responsibly”.
So far this year, the force have responded to 14 wildfires in the city, and there have been “countless callouts” to smaller fires involving grass, trees and in other outdoor spaces.
In London, a heatwave is triggered when a location records at least three consecutive days where the daily maximum temperature meets or exceeds 28C (82F).
