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Livermore September Weather

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

Typical Livermore September Weather 1991–2020
Average daily high	85.9 °F
Average daily low	55.4 °F
Average monthly precipitation	0.1 inches
Daily chance of precipitation	2.0%

Livermore September Weather Records 1903–2024
Highest temperature	115 °F	September 3, 1950
Lowest temperature	35 °F	September 30, 1950
Highest daily low	76 °F	September 3, 2017
Lowest daily high	58 °F	September 30, 1930
Hottest average high temperature	93.0 °F	1984
Coldest average high temperature	74.1 °F	1925
Most daily precipitation	4.0 inches	September 12, 1918
Most monthly precipitation	5.7 inches	1918

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	87.2	56.6	109	41
September 2	87.0	56.5	111	45
September 3	86.9	56.4	115	44
September 4	86.9	56.3	113	43
September 5	86.9	56.3	113	44
September 6	86.9	56.2	113	45
September 7	86.8	56.1	112	43
September 8	86.7	56.0	112	44
September 9	86.7	55.9	109	43
September 10	86.6	55.8	108	43
September 11	86.4	55.7	105	41
September 12	86.3	55.6	105	37
September 13	86.2	55.5	109	40
September 14	86.1	55.5	109	37
September 15	86.0	55.4	109	39
September 16	85.7	55.3	110	43
September 17	85.4	55.2	111	43
September 18	85.2	55.1	111	41
September 19	85.0	54.9	104	41
September 20	84.6	54.8	103	37
September 21	84.2	54.7	104	40
September 22	83.9	54.5	106	40
September 23	83.8	54.3	107	42
September 24	83.7	54.1	106	41
September 25	83.6	54.0	101	39
September 26	83.3	53.8	103	41
September 27	83.0	53.6	105	41
September 28	82.9	53.3	105	42
September 29	82.8	53.2	102	39
September 30	82.8	53.1	101	35

Weather Station Details

Years	Station	Coordinates
1999–2024	Livermore Municipal Airport	location
1903–1998	Livermore	location