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Basel September Weather

Averages and records for weather in Basel, Switzerland in the month of September.

Typical Basel September Weather 1991–2020
Average daily high	20.7 °C
Average daily low	11.0 °C
Average monthly precipitation	7.0 cm
Daily chance of precipitation	39.8%

Basel September Weather Records 1901–2024
Highest temperature	35.0 °C	September 6, 1949
Lowest temperature	-1.3 °C	September 25, 1931
Highest daily low	20.6 °C	September 4, 2006
Lowest daily high	7.6 °C	September 24, 2002
Hottest average high temperature	26.7 °C	1947
Coldest average high temperature	14.1 °C	1912
Most daily precipitation	7.1 cm	September 13, 2008
Most monthly precipitation	20.8 cm	1940

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	23.2	13.0	33.8	3.9
September 2	23.0	12.9	32.7	5.5
September 3	22.8	12.7	34.1	5.4
September 4	22.6	12.5	33.7	4.4
September 5	22.4	12.4	34.1	4.7
September 6	22.2	12.2	35.0	3.4
September 7	22.1	12.1	30.4	4.7
September 8	21.9	11.9	31.0	3.8
September 9	21.7	11.8	31.5	3.3
September 10	21.5	11.6	31.9	2.7
September 11	21.3	11.5	33.9	2.3
September 12	21.1	11.4	34.7	3.4
September 13	21.0	11.2	33.6	3.8
September 14	20.9	11.1	32.8	2.6
September 15	20.8	11.1	33.7	-0.2
September 16	20.7	11.0	32.9	1.9
September 17	20.5	10.9	33.3	0.5
September 18	20.4	10.8	33.1	2.4
September 19	20.3	10.7	34.5	3.3
September 20	20.1	10.6	30.4	1.1
September 21	19.9	10.5	29.2	1.4
September 22	19.8	10.4	29.4	2.0
September 23	19.6	10.4	30.2	2.0
September 24	19.3	10.3	29.1	-0.8
September 25	19.1	10.2	28.2	-1.3
September 26	18.9	10.1	29.3	0.5
September 27	18.7	9.9	28.2	0.6
September 28	18.6	9.8	27.9	0.9
September 29	18.5	9.7	27.8	-1.2
September 30	18.3	9.6	27.5	-0.1

Weather Station Details

Years	Station	Coordinates
1901–2024	Basel Binningen	location