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Following a period of unexpectedly warm conditions, the UK is bracing for a marked drop in temperatures, with the coldest night this autumn expected by the middle of the week. As Arctic air moves southwards, some regions will experience their first frost, with overnight lows potentially hovering just a couple of degrees above freezing by Thursday morning. Alongside the cooler air, rain is set to arrive across England and Wales, providing some relief for areas that have been unusually dry.
For much of this autumn, the jet stream has stayed to the north, allowing warm south and south-westerly winds to dominate, particularly in southern parts of the UK. However, this situation is changing as the jet stream shifts further south, ushering in colder winds from the north. While the temperature drop will be noticeable compared to recent weeks, daytime highs will largely be close to typical autumn levels or slightly below. For instance, on Wednesday, temperatures are forecast to reach between 12C and 14C in Scotland and Northern Ireland, and between 14C and 16C across England and Wales.
In the northern half of the country, temperatures have largely been on track with seasonal averages this month, but the south has experienced bouts of warmth, with daily highs exceeding 20C since mid-June. Temperatures on Thursday morning will bring a more distinct chill, with minimums generally between 5C and 7C. Some of the coldest spots—particularly in northern and eastern England and eastern Scotland—could see temperatures only slightly above freezing, resulting in frost on grass and car windscreens.
The colder spell is accompanied by much-needed precipitation, particularly over England and Wales. A frontal system will bring cloudy and wet conditions on Wednesday, especially affecting East Anglia and the far south-east, where rainfall between 20 and 30mm could fall. This amount could equal half a month’s average rainfall within a single day. Currently, large parts of England and all of Wales remain in drought conditions. Authorities have indicated that a consistent increase in rainfall—about 20% above average for several months—will be required to fully resolve the drought. Despite the onset of chill, by Thursday afternoon many areas may enjoy bright and dry conditions, and warmer weather is expected to return by Friday as milder westerly winds push temperatures up, potentially reaching 20C in eastern England
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