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St. Helena August Weather

Averages and records for weather in St. Helena, California in the month of August.

Typical St. Helena August Weather 1991–2020
Average daily high	88.6 °F
Average daily low	55.3 °F
Average monthly precipitation	0.0 inches
Average monthly snow	none
Daily chance of precipitation	0.46%
Daily chance of snow	0%

St. Helena August Weather Records 1907–2023
Highest temperature	112 °F	August 28, 1915
Lowest temperature	38 °F	August 27, 1942
Highest daily low	73 °F	August 16, 2020
Lowest daily high	61 °F	August 25, 1920
Hottest average high temperature	94.9 °F	1969
Coldest average high temperature	83.0 °F	1954
Most daily precipitation	0.7 inches	August 20, 1997
Most monthly precipitation	0.8 inches	1965
Most daily snow	none	-
Most monthly snow	none	-

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

Day	Average (°F)		Record (°F)
Day	High	Low	High	Low
August 1	89.1	55.8	111	41
August 2	89.2	55.8	109	40
August 3	89.2	55.8	108	42
August 4	89.2	55.8	107	43
August 5	89.3	55.7	107	40
August 6	89.1	55.7	108	42
August 7	89.0	55.6	108	42
August 8	89.0	55.6	106	40
August 9	88.9	55.6	105	41
August 10	88.9	55.6	108	43
August 11	88.8	55.6	110	42
August 12	88.8	55.5	107	41
August 13	88.8	55.5	105	41
August 14	88.9	55.5	109	42
August 15	88.9	55.5	106	40
August 16	88.9	55.5	105	41
August 17	88.8	55.5	108	41
August 18	88.9	55.4	107	41
August 19	88.9	55.4	111	40
August 20	89.0	55.4	106	41
August 21	89.0	55.4	103	40
August 22	89.1	55.3	104	40
August 23	89.2	55.3	108	40
August 24	89.2	55.2	110	41
August 25	89.2	55.1	107	40
August 26	89.1	55.1	107	40
August 27	89.0	55.0	109	38
August 28	88.8	54.9	112	40
August 29	88.8	54.9	107	42
August 30	88.6	54.8	106	40
August 31	88.4	54.8	107	40

Weather Station Details

Years	Station	Coordinates
1907–2023	Saint Helena	location