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London Heathrow September Weather

Averages and records for weather in London Heathrow, United Kingdom in the month of September.

Typical London Heathrow September Weather 1991–2020
Average daily high	20.2 °C
Average daily low	11.6 °C
Average monthly precipitation	5.0 cm
Daily chance of precipitation	42.6%

London Heathrow September Weather Records 1959–2024
Highest temperature	33.0 °C	September 8, 2023
Lowest temperature	2.4 °C	September 30, 1974
Highest daily low	18.9 °C	September 10, 2023
Lowest daily high	10.0 °C	September 26, 1993
Hottest average high temperature	24.4 °C	2023
Coldest average high temperature	17.1 °C	1993
Most daily precipitation	4.6 cm	September 22, 1992
Most monthly precipitation	14.0 cm	1974

Note: Daily averages are a moving average which includes 14 days before and after

Day	Average (°C)		Record (°C)
Day	High	Low	High	Low
September 1	21.8	12.8	28.6	6.6
September 2	21.6	12.7	26.8	8.5
September 3	21.5	12.6	30.0	7.2
September 4	21.4	12.5	30.5	6.0
September 5	21.2	12.4	31.6	5.5
September 6	21.2	12.3	32.3	5.5
September 7	21.1	12.2	30.5	5.5
September 8	20.9	12.1	33.0	6.1
September 9	20.8	12.1	30.3	5.1
September 10	20.7	11.9	28.5	4.5
September 11	20.6	11.8	30.2	5.6
September 12	20.5	11.8	32.8	6.9
September 13	20.4	11.7	29.5	6.1
September 14	20.4	11.6	29.4	4.7
September 15	20.2	11.6	27.0	6.0
September 16	20.1	11.6	27.9	4.0
September 17	20.0	11.5	28.3	4.9
September 18	19.8	11.4	25.2	4.2
September 19	19.6	11.3	27.0	5.2
September 20	19.5	11.2	26.8	3.9
September 21	19.3	11.1	27.8	3.9
September 22	19.1	11.0	25.2	4.3
September 23	19.0	10.9	24.6	4.3
September 24	18.9	10.8	23.0	4.0
September 25	18.7	10.7	24.4	3.3
September 26	18.6	10.6	23.6	3.6
September 27	18.5	10.6	25.9	4.0
September 28	18.4	10.5	28.1	3.9
September 29	18.2	10.5	28.5	4.5
September 30	18.0	10.4	28.8	2.4

Weather Station Details

Years	Station	Coordinates
1959–2024	London Heathrow Airport	location