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St. Helena May Weather

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

Typical St. Helena May Weather 1991–2020
Average daily high	78.5 °F
Average daily low	50.2 °F
Average monthly precipitation	1.1 inches
Average monthly snow	none
Daily chance of precipitation	10.6%
Daily chance of snow	0%

St. Helena May Weather Records 1907–2023
Highest temperature	107 °F	May 30, 1919
Lowest temperature	31 °F	May 5, 1933
Highest daily low	76 °F	May 15, 2008
Lowest daily high	50 °F	May 3, 1930
Hottest average high temperature	88.1 °F	2001
Coldest average high temperature	68.3 °F	1998
Most daily precipitation	2.0 inches	May 18, 2005
Most monthly precipitation	5.2 inches	1915
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
May 1	76.2	48.1	98	34
May 2	76.4	48.3	95	33
May 3	76.5	48.5	97	32
May 4	76.7	48.6	97	32
May 5	76.9	48.7	100	31
May 6	77.1	48.8	102	33
May 7	77.3	48.9	101	32
May 8	77.4	49.0	97	34
May 9	77.7	49.1	98	33
May 10	77.8	49.3	100	34
May 11	77.8	49.4	97	35
May 12	77.9	49.5	103	36
May 13	78.0	49.7	100	36
May 14	78.1	49.8	98	36
May 15	78.2	49.9	99	34
May 16	78.3	50.0	98	33
May 17	78.5	50.1	99	36
May 18	78.7	50.2	104	33
May 19	78.9	50.4	101	35
May 20	79.1	50.5	99	37
May 21	79.3	50.7	99	35
May 22	79.5	50.8	99	35
May 23	79.6	50.9	101	35
May 24	79.8	50.9	99	32
May 25	80.0	51.1	100	36
May 26	80.2	51.3	101	33
May 27	80.4	51.4	105	31
May 28	80.6	51.6	104	37
May 29	80.9	51.7	106	38
May 30	81.2	51.8	107	35
May 31	81.5	52.0	106	35

Weather Station Details

Years	Station	Coordinates
1907–2023	Saint Helena	location