Weather in London in September
September in London is cool with average temperatures around 14.9°C (58.8°F). Light rainfall with only 44mm expected.
Data Note: Temperature values are 2001–2020 satellite/reanalysis grid averages from NASA POWER and may differ from airport station normals by a few degrees.
Temperature
High
19.7°C
67.5°F
Low
10.1°C
50.2°F
Precipitation
44 mm
1.7 inches
~9 rainy days
Conditions
Humidity
81%
Comparison to Adjacent Months
September is 2.5°C cooler than August, 21mm drier than August.
September is 3.3°C warmer than October, 29mm drier than October.