London Weather In September 2024 Uk. Expect 19°c daytime maximum temperatures in the shade with on average 5 hours of sunshine per day in london in september. The temperature now descends from 19.3°c (66.7°f) to 12.5°c.

London weather in september 2024. The temperatures in london in september are usually low and can range between 53°f and 66°f.