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San Luis Obispo September Weather

Averages and records for weather in San Luis Obispo, California in the month of September.

Typical San Luis Obispo September Weather 1991–2020
Average daily high	80.5 °F
Average daily low	53.5 °F
Average monthly precipitation	0.1 inches
Daily chance of precipitation	3.0%

San Luis Obispo September Weather Records 1893–2024
Highest temperature	117 °F	September 6, 2020
Lowest temperature	38 °F	September 5, 1930
Highest daily low	75 °F	September 22, 1939
Lowest daily high	58 °F	September 1, 1942
Hottest average high temperature	88.7 °F	1984
Coldest average high temperature	73.6 °F	1933
Most daily precipitation	2.0 inches	September 29, 1994
Most monthly precipitation	3.9 inches	1976

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

Day	Average (°F)		Record (°F)
Day	High	Low	High	Low
September 1	80.2	54.5	106	42
September 2	80.2	54.4	114	46
September 3	80.2	54.3	105	42
September 4	80.2	54.3	103	41
September 5	80.2	54.2	101	38
September 6	80.3	54.1	117	43
September 7	80.3	54.1	108	43
September 8	80.3	54.0	103	44
September 9	80.3	53.9	101	44
September 10	80.4	53.9	101	44
September 11	80.4	53.9	102	43
September 12	80.5	53.9	107	45
September 13	80.5	53.8	101	42
September 14	80.5	53.8	112	43
September 15	80.5	53.7	100	43
September 16	80.4	53.6	105	45
September 17	80.4	53.5	99	43
September 18	80.4	53.5	103	41
September 19	80.3	53.4	99	41
September 20	80.2	53.4	100	44
September 21	80.0	53.3	107	45
September 22	80.0	53.3	105	43
September 23	80.1	53.1	104	41
September 24	80.2	53.0	102	42
September 25	80.2	52.9	105	42
September 26	80.1	52.8	104	40
September 27	80.1	52.6	111	44
September 28	80.1	52.5	110	43
September 29	80.3	52.5	104	42
September 30	80.3	52.4	107	41

Weather Station Details

Years	Station	Coordinates
1999–2024	San Luis Obispo Airport	location
1893–1998	San Luis Obispo Poly	location