September weather in Chico, CA
The average temperature in Chico in September is 72.9°F (54.9°F–90.9°F). Average precipitation: 0.25 inches.
September is a fall month in Chico, and is warmer than the annual average of 61.7°F. Daily temperatures swing about 36°F between overnight low and afternoon high. Daylight averages about 12h 15m. For travel, September is hot.
Avg High
90.9°F
Avg Low
54.9°F
Precipitation
0.25 in
Daylight
12h 15m
September records in Chico
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 111.0°F (1950) | 45.0°F (1999) | 0.74 in (1964) |
| September 2 | 109.0°F (2017) | 46.0°F (1964) | 0.24 in (2000) |
| September 3 | 109.0°F (1950) | 45.0°F (1910) | 0.17 in (1912) |
| September 4 | 114.1°F (1988) | 45.0°F (1912) | 0.13 in (1912) |
| September 5 | 106.0°F (1943) | 43.0°F (1920) | 0.01 in (1936) |
| September 6 | 109.0°F (1944) | 44.1°F (1922) | 0.90 in (1978) |
| September 7 | 115.0°F (2022) | 41.0°F (1985) | 0.70 in (1919) |
| September 8 | 111.9°F (1944) | 43.0°F (1927) | 1.60 in (1985) |
| September 9 | 111.9°F (2022) | 45.0°F (1927) | 0.44 in (1985) |
| September 10 | 108.0°F (1922) | 43.0°F (2010) | 0.24 in (1985) |
| September 11 | 108.0°F (2015) | 39.0°F (1978) | 0.09 in (1976) |
| September 12 | 109.9°F (2011) | 43.0°F (1983) | 0.37 in (1918) |
| September 13 | 109.0°F (1971) | 39.0°F (1910) | 1.68 in (1918) |
| September 14 | 107.1°F (1971) | 39.0°F (1970) | 0.60 in (1918) |
| September 15 | 107.1°F (2025) | 42.1°F (1970) | 0.75 in (1910) |
| September 16 | 107.1°F (1913) | 44.1°F (1906) | 0.25 in (1961) |
| September 17 | 109.0°F (1913) | 41.0°F (1906) | 1.96 in (1989) |
| September 18 | 107.1°F (1913) | 39.9°F (1907) | 1.86 in (1959) |
| September 19 | 105.1°F (1913) | 41.0°F (1926) | 0.82 in (1977) |
| September 20 | 106.0°F (2000) | 41.0°F (1924) | 0.64 in (2022) |
| September 21 | 107.1°F (1943) | 37.9°F (1968) | 0.01 in (1930) |
| September 22 | 109.0°F (1943) | 39.9°F (2010) | 0.40 in (1916) |
| September 23 | 105.1°F (2009) | 39.0°F (1978) | 1.17 in (1983) |
| September 24 | 102.9°F (1936) | 37.9°F (1978) | 0.44 in (1982) |
| September 25 | 105.1°F (1944) | 37.0°F (1948) | 1.26 in (1923) |
| September 26 | 108.0°F (1944) | 39.9°F (1908) | 0.39 in (1939) |
| September 27 | 102.0°F (1991) | 35.1°F (1986) | 2.20 in (1957) |
| September 28 | 102.0°F (2009) | 35.1°F (1986) | 0.97 in (1938) |
| September 29 | 106.0°F (1966) | 39.9°F (1955) | 0.50 in (1989) |
| September 30 | 106.0°F (2010) | 37.9°F (1971) | 0.56 in (2019) |