Thermograph

How unusual is the weather? Graded against ~45 years of local climate history.

Weather in London in September

In an average September, London sees a daily high around 22°C and a low around 12°C, based on 1980–2026 of local climate records.

Average high22°C
Typical high range17°C to 27°C
Average low12°C
Typical low range6°C to 18°C
Average daily precipitation3 mm

September records

The most extreme September on record for each metric, across 1980–2026. For rainfall, the wettest and driest are by total September accumulation.

High

Highest 33°C 2013-09-10
Lowest 9°C 1981-09-30

Low

Highest 24°C 2016-09-08
Lowest -2°C 1993-09-30

Feels-like

Highest 45°C 2013-09-10
Lowest -7°C 1993-09-30

Humidity

Highest 21.2 g/m³ 2016-09-07
Lowest 4.3 g/m³ 1993-09-30

Wind

Highest 40 km/h 2003-09-27
Lowest 6 km/h 1996-09-03

Gust

Highest 93 km/h 2003-09-27
Lowest 13 km/h 2014-09-28

Precip

Wettest 243 mm 1986
Driest 30 mm 1998

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