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Riverside September Weather

Averages and records for weather in Riverside, California in the month of September.

Typical Riverside September Weather 1991–2020
Average daily high	92.2 °F
Average daily low	61.6 °F
Average monthly precipitation	0.1 inches
Daily chance of precipitation	1.8%

Riverside September Weather Records 1893–2024
Highest temperature	117 °F	September 6, 2020
Lowest temperature	37 °F	September 15, 1902
Highest daily low	80 °F	September 4, 2022
Lowest daily high	62 °F	September 24, 1934
Hottest average high temperature	98.4 °F	1922
Coldest average high temperature	83.8 °F	1976
Most daily precipitation	1.8 inches	September 15, 2015
Most monthly precipitation	3.9 inches	1963

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	94.6	63.7	112	46
September 2	94.4	63.6	111	46
September 3	94.3	63.4	112	45
September 4	94.2	63.3	110	42
September 5	94.1	63.2	117	42
September 6	93.9	63.1	117	46
September 7	93.7	62.9	110	44
September 8	93.4	62.8	109	45
September 9	93.3	62.6	111	43
September 10	93.1	62.4	109	44
September 11	93.0	62.3	108	45
September 12	92.8	62.1	111	40
September 13	92.6	62.0	113	42
September 14	92.4	61.8	109	41
September 15	92.2	61.7	108	37
September 16	92.1	61.5	110	44
September 17	91.9	61.4	112	43
September 18	91.6	61.2	108	42
September 19	91.3	60.9	106	42
September 20	90.8	60.6	106	44
September 21	90.4	60.4	109	42
September 22	90.1	60.1	113	43
September 23	89.9	59.8	109	41
September 24	89.8	59.6	109	42
September 25	89.5	59.4	108	41
September 26	89.3	59.2	110	39
September 27	89.0	59.0	113	40
September 28	88.8	58.7	106	42
September 29	88.6	58.6	106	41
September 30	88.4	58.4	108	42

Weather Station Details

Years	Station	Coordinates
1999–2024	Riverside Municipal Airport	location
1893–1998	Riverside Fire Station	location