Later this month, certain regions of the United Kingdom might experience temperatures reaching 20C as warm air is expected to move in according to weather forecasts. Maps from WXCharts suggest that the temperature increase will begin on Saturday, September 20, marking the transition to autumn in many areas of the country following a notably hot summer.
Although September has been marked by cooler temperatures, heavy rain, and storms, a shift is anticipated with a warm spell approaching from northwestern Europe. This final taste of summer is predicted to bring higher temperatures, especially to southern and central England, with cities like Cambridge, London, and Norwich likely to see highs of 20C extending into the evening.
The previous month, the Met Office confirmed that 2025 was the hottest summer on record in the UK, with the mean temperature across the nation averaging 16.01C. The peak temperature of the season was recorded in Faversham, Kent, at 35.8C on July 1.
Weather experts are monitoring the development of a deepening area of low pressure over the North Atlantic, which could result in impactful weather for the UK, particularly on Sunday and Monday. The forecast indicates the likelihood of heavy rain and strong winds, mainly affecting the northern regions of the country.
Looking ahead, the BBC Weather outlook for the upcoming week predicts warmth but increasing breeziness leading up to showery rain on Sunday. The following week is expected to bring continued unsettled weather with a mix of sunshine, scattered showers, and more widespread rain, potentially heavy and thundery with blustery winds.
Further into the week, additional low-pressure systems are forecasted to bring showers, sustained periods of rain, and a risk of thunderstorms and hail. Temperatures are expected to remain above the September average, with fluctuating conditions and no significant cooling trend anticipated. Any dry spells are unlikely to persist for long.