Temperatures will be rising back to summer levels this week but weather conditions will stay wet for many, say forecasters.
The mercury could top 20C in London and the south east on Thursday and Friday, according to BBC Weather, making it considerably warmer than usual for the end of October.
Cardiff and Manchester will also see numbers in the high teens midweek, though this will be accompanied by the arrival of a rainy front that will likely last through until the weekend.