September weather in Livermore, CA
The average temperature in Livermore in September is 70.3°F (54.7°F–85.9°F). Average precipitation: 0.09 inches.
September is a fall month in Livermore, and is warmer than the annual average of 60.4°F. Daily temperatures swing about 31.2°F between overnight low and afternoon high. Expect about 1 days with precipitation. Daylight averages about 12h 14m. For travel, September is a comfortable month to visit.
Avg High
85.9°F
Avg Low
54.7°F
Precipitation
0.09 in
Daylight
12h 14m
September records in Livermore
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 109.0°F (1952) | 41.0°F (1960) | 0.15 in (2000) |
| September 2 | 111.0°F (1950) | 45.0°F (1910) | 0.01 in (2000) |
| September 3 | 115.0°F (1950) | 44.1°F (1970) | 0.05 in (1912) |
| September 4 | 113.0°F (1950) | 43.0°F (1970) | 0.03 in (1912) |
| September 5 | 116.1°F (2022) | 44.1°F (1914) | 0.02 in (1978) |
| September 6 | 116.1°F (2022) | 45.0°F (1911) | 0.39 in (1912) |
| September 7 | 108.0°F (1904) | 43.0°F (1946) | 0.01 in (1919) |
| September 8 | 113.0°F (2022) | 44.1°F (1946) | 0.12 in (1985) |
| September 9 | 109.0°F (1944) | 43.0°F (1915) | 0.10 in (1998) |
| September 10 | 107.1°F (1951) | 43.0°F (1915) | 0.06 in (2025) |
| September 11 | 105.1°F (1948) | 41.0°F (1977) | 0.10 in (1952) |
| September 12 | 105.1°F (1983) | 37.0°F (1970) | 3.97 in (1918) |
| September 13 | 109.0°F (1971) | 39.9°F (1910) | 1.48 in (1918) |
| September 14 | 109.0°F (1971) | 37.0°F (1970) | 0.26 in (2009) |
| September 15 | 109.0°F (1971) | 39.0°F (1970) | 0.04 in (1982) |
| September 16 | 109.9°F (1913) | 43.0°F (1970) | 0.53 in (1989) |
| September 17 | 111.0°F (1913) | 43.0°F (1908) | 0.23 in (1940) |
| September 18 | 111.0°F (1913) | 41.0°F (1965) | 0.36 in (1959) |
| September 19 | 104.0°F (1917) | 41.0°F (1916) | 1.53 in (1959) |
| September 20 | 107.1°F (1917) | 37.0°F (1912) | 0.46 in (2022) |
| September 21 | 104.0°F (1943) | 39.9°F (1960) | 0.33 in (2013) |
| September 22 | 963.0°F (1914) | 39.9°F (1960) | 0.21 in (2007) |
| September 23 | 107.1°F (1949) | 42.1°F (1972) | 0.78 in (1904) |
| September 24 | 106.0°F (1936) | 41.0°F (1948) | 0.24 in (1982) |
| September 25 | 100.9°F (1944) | 39.0°F (1934) | 0.55 in (1923) |
| September 26 | 102.9°F (1952) | 41.0°F (1934) | 0.47 in (1904) |
| September 27 | 105.1°F (1963) | 41.0°F (1929) | 0.57 in (1972) |
| September 28 | 105.1°F (2010) | 42.1°F (1911) | 0.79 in (1976) |
| September 29 | 102.0°F (2010) | 39.0°F (1986) | 0.39 in (1989) |
| September 30 | 99.0°F (1952) | 35.1°F (1950) | 1.02 in (1983) |