September weather in Atwater, CA
The average temperature in Atwater in September is 72.7°F (56.1°F–89.3°F). Average precipitation: 0.07 inches.
September is a fall month in Atwater, and is warmer than the annual average of 61.6°F. Daily temperatures swing about 33.2°F between overnight low and afternoon high. Expect about 1 days with precipitation. Daylight averages about 12h 14m. For travel, September is hot.
Avg High
89.3°F
Avg Low
56.1°F
Precipitation
0.07 in
Daylight
12h 14m
September records in Atwater
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 106.0°F (1905) | 45.0°F (1959) | 0.28 in (1983) |
| September 2 | 108.0°F (1903) | 46.9°F (1905) | 0.09 in (2025) |
| September 3 | 108.0°F (1903) | 44.1°F (1905) | 0.13 in (1912) |
| September 4 | 107.1°F (1903) | 44.1°F (1905) | 0.05 in (1978) |
| September 5 | 106.0°F (1904) | 41.0°F (1905) | 0.41 in (1978) |
| September 6 | 108.0°F (1904) | 42.1°F (1905) | 0.04 in (2012) |
| September 7 | 109.0°F (1904) | 42.1°F (1905) | 0.00 in (1899) |
| September 8 | 109.9°F (1904) | 41.0°F (1900) | 0.00 in (1899) |
| September 9 | 106.0°F (1904) | 44.1°F (1927) | 0.00 in (1899) |
| September 10 | 106.0°F (1944) | 45.0°F (1901) | 0.25 in (1978) |
| September 11 | 106.0°F (1904) | 44.1°F (1952) | 0.84 in (1976) |
| September 12 | 104.0°F (1922) | 45.0°F (1905) | 0.04 in (1918) |
| September 13 | 102.9°F (1922) | 45.0°F (1928) | 0.30 in (1963) |
| September 14 | 102.9°F (1922) | 41.0°F (1927) | 0.44 in (1918) |
| September 15 | 102.9°F (1929) | 39.9°F (1903) | 0.06 in (2009) |
| September 16 | 105.1°F (1909) | 45.0°F (1903) | 0.33 in (1982) |
| September 17 | 104.0°F (1937) | 39.0°F (2006) | 0.41 in (1989) |
| September 18 | 108.0°F (1913) | 35.1°F (1978) | 0.68 in (1959) |
| September 19 | 109.9°F (1913) | 39.9°F (1905) | 0.72 in (1959) |
| September 20 | 104.0°F (1939) | 39.0°F (2004) | 0.05 in (2005) |
| September 21 | 105.1°F (1905) | 42.1°F (1903) | 0.20 in (2005) |
| September 22 | 105.1°F (1905) | 32.0°F (1906) | 0.36 in (1923) |
| September 23 | 104.0°F (1939) | 44.1°F (1981) | 1.25 in (1904) |
| September 24 | 105.1°F (1939) | 42.1°F (1931) | 0.55 in (1904) |
| September 25 | 102.0°F (1975) | 26.1°F (1983) | 0.32 in (1939) |
| September 26 | 104.0°F (1963) | 37.9°F (1948) | 0.30 in (1939) |
| September 27 | 102.9°F (1963) | 39.9°F (1948) | 0.20 in (1938) |
| September 28 | 104.0°F (2009) | 39.9°F (1905) | 0.20 in (1994) |
| September 29 | 102.0°F (1906) | 35.1°F (1905) | 0.76 in (1989) |
| September 30 | 100.9°F (1999) | 37.0°F (1905) | 1.04 in (1919) |