Parts of Britain are set to experience exceptionally warm weather today with temperatures reaching 27°C, followed by an unusual "tropical night" where temperatures may not fall below 20°C – both significantly above average for late September. This unseasonable warmth will be short-lived, however, as a "weather bomb" moves in tomorrow, bringing heavy rain and 50mph gusts across the country.

The extreme weather system, classified as a "weather bomb" due to a pressure drop of 32 millibars in 24 hours (from 987mb to 955mb), originates from a deep low-pressure area in the Atlantic Ocean. As the weather front moves from west to east, it will bring approximately 40mm of rain, with some areas receiving over 40mm, particularly on south-facing hills in the west, alongside gusty winds exceeding 50mph in exposed coastal areas. After conditions remain unsettled through Thursday and Friday, high pressure is expected to build over the weekend, bringing drier weather and temperatures returning to average levels.