September weather in Atascadero, CA
The average temperature in Atascadero in September is °F (°F–°F). Average precipitation: 0.12 inches.
September is a fall month in Atascadero, and is cooler than the annual average of 0°F. Expect about 1 days with precipitation. Daylight averages about 12h 13m.
Avg High
°F
Avg Low
°F
Precipitation
0.12 in
Daylight
12h 13m
September records in Atascadero
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 100.0°F (2014) | 43.0°F (1975) | 0.11 in (1964) |
| September 2 | 100.0°F (2014) | 43.0°F (1975) | 0.20 in (1967) |
| September 3 | 93.0°F (2013) | 43.0°F (1975) | 0.07 in (1967) |
| September 4 | 93.9°F (2012) | 46.0°F (2011) | 0.06 in (2017) |
| September 5 | 98.1°F (1975) | 48.0°F (2011) | 1.05 in (1978) |
| September 6 | 104.0°F (1975) | 46.9°F (2014) | 0.02 in (1969) |
| September 7 | 107.1°F (2011) | 48.9°F (2014) | 0.52 in (1958) |
| September 8 | 104.0°F (2011) | 53.1°F (1975) | 0.32 in (1958) |
| September 9 | 99.0°F (2012) | 46.0°F (2014) | 0.03 in (1985) |
| September 10 | 100.9°F (2012) | 45.0°F (1975) | 0.11 in (1976) |
| September 11 | 99.0°F (2014) | 52.0°F (1975) | 1.74 in (1976) |
| September 12 | 97.0°F (2014) | 48.0°F (1975) | 0.00 in (1946) |
| September 13 | 105.1°F (2014) | 46.9°F (1975) | 0.00 in (1946) |
| September 14 | 99.0°F (2013) | 46.9°F (1975) | 0.01 in (1978) |
| September 15 | 100.9°F (2013) | 46.0°F (1975) | 0.00 in (1946) |
| September 16 | 107.1°F (2012) | 45.0°F (1975) | 0.69 in (1982) |
| September 17 | 106.0°F (2014) | 44.1°F (2011) | 0.32 in (1989) |
| September 18 | 93.0°F (2014) | 46.0°F (2011) | 0.19 in (1959) |
| September 19 | 93.9°F (2011) | 46.9°F (2011) | 2.44 in (1959) |
| September 20 | 99.0°F (2011) | 46.0°F (1975) | 0.53 in (2022) |
| September 21 | 100.0°F (2011) | 48.0°F (1975) | 0.03 in (1990) |
| September 22 | 98.1°F (2011) | 48.0°F (2013) | 0.69 in (1990) |
| September 23 | 98.1°F (1975) | 50.0°F (2013) | 0.35 in (1958) |
| September 24 | 100.0°F (1975) | 51.1°F (1975) | 0.44 in (2025) |
| September 25 | 102.0°F (1975) | 46.0°F (2012) | 1.20 in (1986) |
| September 26 | 98.1°F (1975) | 41.0°F (2013) | 0.72 in (1982) |
| September 27 | 89.1°F (1975) | 41.0°F (2013) | 0.05 in (1957) |
| September 28 | 99.0°F (2011) | 42.1°F (1975) | 0.48 in (1994) |
| September 29 | 99.0°F (2011) | 44.1°F (1975) | 2.30 in (1976) |
| September 30 | 95.0°F (2012) | 44.1°F (1975) | 0.59 in (1966) |