Weather maps indicate that parts of Britain could experience 20C heat around noon on Saturday, September 20, as a surge of warm air moves in from northwestern Europe. The warm spell is expected to bring a final taste of summer, mainly to southern and central England, with cities including Cambridge, London and Norwich forecast to reach highs of 20C continuing into the evening.
Temperatures are predicted to fall to the high teens on September 21, before settling around the monthly average of 17C in subsequent days. This comes after September has been characterised by a dip in temperatures, heavy rainfall and storms, following the hottest summer on record in the UK.
The Met Office confirmed that 2025 was the hottest summer on record, with a mean temperature of 16.01C across the nation. The highest temperature of the summer was recorded in Faversham, Kent, on July 1, reaching 35.8C.
However, the weather experts have forecast generally more unsettled conditions throughout September. Deputy chief meteorologist Tom Crabtree said: 'We are keeping an eye on a deepening area of low-pressure which will develop over the North Atlantic during the coming days and might bring impactful weather to the UK, most likely on Sunday and Monday.'
BBC Weather's outlook for the rest of the week states that the weekend will be warm but breezy, with showery rain from west to east on Sunday. Next week is expected to bring further unsettled weather, with sunshine and sharp showers on Monday, followed by more widespread rain on Tuesday, locally heavy and thundery with blustery winds.
Through the second half of next week, further showers or sustained periods of rain are likely, some occasionally heavy with a risk of thunderstorms and hail. Winds will be strong and gusty at times, and temperatures will fluctuate just above the September average, with no significant cool-down anticipated.
