This is estimated to be hotter than Ibiza, which is forecast to have highs of 27 °C
The Met Office and the UK Health Security Agency (UKHSA) have issued an amber heat-health alert (HHA) for all regions of England, including London.
Sunny conditions will last for much of the weekend, with some clouds at certain hours of the day.
The Met Office reported that Thursday (June 19) was the hottest day of 2025, with temperatures having reached 32.2C in Kew and Heathrow.
Here’s the hour-by-hour forecast for Saturday (June 21).
- 6am – Sunny intervals, 20 °C
- 7am – Sunny intervals, 21 °C
- 8am – Sunny intervals, 22 °C
- 9am – Sunny intervals, 24 °C
- 10am – Sunny intervals, 26 °C
- 11am – Sunny intervals, 28 °C
- 12pm – Sunny intervals, 29 °C
- 1pm – Sunny intervals, 30 °C
- 2pm – Sunny intervals, 31 °C
- 3pm – Cloudy, 31 °C
- 4pm – Sunny intervals, 31 °C
- 5pm – Sunny intervals, 31 °C
- 6pm – Sunny intervals, 32 °C
- 7pm – Sunny intervals, 31 °C
- 8pm – Sunny intervals, 30 °C
- 9pm – Partly cloudy, 29 °C
- 10pm – Partly cloudy, 27 °C
- 11pm – Partly cloudy, 26 °C
The Met Office forecast in full:
Cloud building from the west, with a few isolated showers possible later, but most parts staying dry.
Hot again, especially in any sunny spells.
Perhaps the odd thunderstorm overnight.
Maximum temperature 33 °C.
Sunday:
- 4am – Sunny, 20 °C
- 7am – Sunny, 18 °C
- 10am – Sunny, 22 °C
- 1pm – Sunny, 26 °C
- 4pm – Sunny, 27 °C
- 7pm – Cloudy, 24 °C
- 10pm – Light rain, 20 °C
The Met Office forecast in full:
Any showers clearing to sunny spells Sunday.
Feeling fresher, but still rather warm.
