September weather in Mount Shasta, CA
The average temperature in Mount Shasta in September is 61.0°F (44.2°F–77.9°F). Average precipitation: 0.53 inches.
September is a fall month in Mount Shasta, and is warmer than the annual average of 50°F. Daily temperatures swing about 33.7°F between overnight low and afternoon high. Expect about 3 days with precipitation. Daylight averages about 12h 16m. For travel, September is a comfortable month to visit.
Avg High
77.9°F
Avg Low
44.2°F
Precipitation
0.53 in
Daylight
12h 16m
September records in Mount Shasta
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 100.9°F (1950) | 34.0°F (1999) | 1.10 in (2023) |
| September 2 | 102.9°F (1955) | 30.9°F (1964) | 1.10 in (2023) |
| September 3 | 100.0°F (1955) | 34.0°F (2020) | 0.11 in (2000) |
| September 4 | 100.9°F (1955) | 35.1°F (2020) | 0.14 in (1952) |
| September 5 | 97.0°F (1955) | 37.9°F (1954) | 0.93 in (1978) |
| September 6 | 95.0°F (2020) | 32.0°F (1996) | 0.26 in (1978) |
| September 7 | 93.0°F (1981) | 32.0°F (2002) | 0.86 in (1985) |
| September 8 | 91.9°F (2008) | 34.0°F (1978) | 0.73 in (1958) |
| September 9 | 96.1°F (2020) | 35.1°F (1964) | 1.90 in (1978) |
| September 10 | 95.0°F (1953) | 33.1°F (1986) | 0.17 in (1980) |
| September 11 | 97.0°F (2009) | 30.0°F (1985) | 0.18 in (2025) |
| September 12 | 96.1°F (2020) | 30.0°F (1972) | 0.42 in (1963) |
| September 13 | 93.9°F (1953) | 32.0°F (1994) | 0.47 in (1950) |
| September 14 | 96.1°F (2020) | 28.0°F (1970) | 0.98 in (1997) |
| September 15 | 96.1°F (1981) | 30.9°F (1955) | 0.46 in (2019) |
| September 16 | 95.0°F (2020) | 30.9°F (2006) | 0.47 in (1961) |
| September 17 | 95.0°F (2020) | 25.0°F (1965) | 1.37 in (1986) |
| September 18 | 96.1°F (2020) | 28.9°F (1965) | 1.23 in (1959) |
| September 19 | 93.0°F (1951) | 26.1°F (1965) | 1.08 in (1977) |
| September 20 | 93.0°F (1952) | 30.9°F (1972) | 0.11 in (2004) |
| September 21 | 93.9°F (1974) | 28.9°F (1993) | 1.16 in (2013) |
| September 22 | 93.0°F (1949) | 32.0°F (1986) | 0.85 in (1983) |
| September 23 | 96.1°F (2009) | 28.9°F (2000) | 0.12 in (1983) |
| September 24 | 95.0°F (2009) | 28.0°F (1958) | 0.24 in (1986) |
| September 25 | 93.0°F (2009) | 28.9°F (2005) | 1.46 in (2001) |
| September 26 | 95.0°F (2009) | 30.0°F (1948) | 3.40 in (1957) |
| September 27 | 95.0°F (2009) | 27.0°F (1986) | 2.98 in (1957) |
| September 28 | 90.0°F (1967) | 30.0°F (1999) | 0.53 in (1962) |
| September 29 | 90.0°F (2008) | 28.0°F (2007) | 0.21 in (1971) |
| September 30 | 87.1°F (1975) | 26.1°F (1950) | 0.31 in (2013) |