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San Sebastián September Weather

Averages and records for weather in San Sebastián, Spain in the month of September.

Typical San Sebastián September Weather 1991–2020
Average daily high	21.2 °C
Average daily low	14.8 °C
Average monthly precipitation	11.7 cm
Daily chance of precipitation	46.2%

San Sebastián September Weather Records 1916–2024
Highest temperature	36.3 °C	September 8, 1966
Lowest temperature	4.8 °C	September 23, 1931
Highest daily low	25.3 °C	September 2, 1930
Lowest daily high	12.4 °C	September 22, 1979
Hottest average high temperature	24.8 °C	2023
Coldest average high temperature	17.5 °C	1931
Most daily precipitation	16.7 cm	September 30, 1949
Most monthly precipitation	31.2 cm	1949

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	22.3	15.9	32.7	8.4
September 2	22.2	15.9	34.5	7.6
September 3	22.2	15.8	34.0	9.8
September 4	22.1	15.7	32.8	10.6
September 5	22.0	15.6	32.0	10.2
September 6	21.9	15.5	32.5	9.2
September 7	21.9	15.5	35.6	10.2
September 8	21.8	15.4	36.3	9.8
September 9	21.7	15.4	33.0	10.4
September 10	21.6	15.3	31.2	9.8
September 11	21.5	15.1	33.9	8.6
September 12	21.4	15.0	34.0	10.0
September 13	21.3	14.9	33.4	10.0
September 14	21.3	14.9	34.1	10.2
September 15	21.2	14.8	34.5	8.9
September 16	21.2	14.8	35.0	9.4
September 17	21.1	14.7	33.0	9.0
September 18	21.1	14.7	31.4	7.6
September 19	21.0	14.6	33.2	8.0
September 20	20.9	14.5	30.4	8.3
September 21	20.8	14.4	32.2	7.6
September 22	20.7	14.3	28.0	7.9
September 23	20.6	14.2	31.4	4.8
September 24	20.5	14.2	31.0	6.9
September 25	20.3	14.1	30.4	6.6
September 26	20.2	14.0	29.6	7.1
September 27	20.2	13.9	28.7	7.9
September 28	20.1	13.9	29.8	8.1
September 29	20.1	13.8	28.8	7.2
September 30	20.0	13.7	31.0	7.0

Weather Station Details

Years	Station	Coordinates
1916–2024	San Sebastian - Igueldo	location