September weather in Big Bear Lake, CA
The average temperature in Big Bear Lake in September is 58.5°F (44.0°F–73.0°F). Average precipitation: 0.40 inches.
September is a fall month in Big Bear Lake, and is warmer than the annual average of 48°F. Daily temperatures swing about 29°F between overnight low and afternoon high. Expect about 2 days with precipitation. Daylight averages about 12h 12m. For travel, September is a comfortable month to visit.
Avg High
73.0°F
Avg Low
44.0°F
Precipitation
0.40 in
Daylight
12h 12m
September records in Big Bear Lake
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 86.0°F (1978) | 30.9°F (1963) | 0.68 in (1998) |
| September 2 | 87.1°F (1978) | 19.0°F (1964) | 0.29 in (2025) |
| September 3 | 86.0°F (1978) | 26.1°F (1964) | 0.28 in (2007) |
| September 4 | 87.1°F (2020) | 32.0°F (1962) | 0.63 in (1963) |
| September 5 | 87.1°F (2020) | 28.0°F (1961) | 0.83 in (1963) |
| September 6 | 87.1°F (2020) | 28.9°F (1961) | 0.56 in (1969) |
| September 7 | 86.0°F (2021) | 28.0°F (1965) | 0.52 in (2013) |
| September 8 | 86.0°F (2021) | 24.1°F (1965) | 0.12 in (1975) |
| September 9 | 84.9°F (2021) | 24.1°F (1965) | 0.27 in (2013) |
| September 10 | 84.0°F (1993) | 27.0°F (1961) | 2.34 in (1976) |
| September 11 | 84.0°F (1971) | 28.9°F (1965) | 2.01 in (1976) |
| September 12 | 84.9°F (1971) | 26.1°F (1965) | 0.23 in (2022) |
| September 13 | 84.0°F (1971) | 30.9°F (1972) | 0.25 in (2011) |
| September 14 | 84.9°F (1971) | 28.0°F (1964) | 0.45 in (1997) |
| September 15 | 82.9°F (1971) | 32.0°F (1963) | 1.27 in (2015) |
| September 16 | 84.9°F (2000) | 28.9°F (1964) | 0.20 in (1978) |
| September 17 | 84.0°F (2000) | 30.9°F (1961) | 1.27 in (1963) |
| September 18 | 82.0°F (2000) | 23.0°F (1961) | 1.94 in (2025) |
| September 19 | 82.9°F (2000) | 24.1°F (1961) | 0.55 in (1984) |
| September 20 | 82.9°F (2000) | 24.1°F (1965) | 0.75 in (2005) |
| September 21 | 82.9°F (2000) | 24.1°F (1986) | 0.14 in (2016) |
| September 22 | 82.9°F (2003) | 26.1°F (1968) | 0.07 in (1999) |
| September 23 | 82.9°F (1982) | 25.0°F (1961) | 0.30 in (1987) |
| September 24 | 82.9°F (1982) | 21.0°F (1986) | 0.20 in (1976) |
| September 25 | 82.0°F (1960) | 24.1°F (1961) | 1.30 in (1986) |
| September 26 | 84.0°F (1960) | 25.0°F (1961) | 0.27 in (1997) |
| September 27 | 84.0°F (2003) | 27.0°F (2013) | 0.48 in (1985) |
| September 28 | 82.0°F (2010) | 24.1°F (1971) | 0.07 in (1967) |
| September 29 | 81.0°F (2009) | 19.9°F (1964) | 0.05 in (2008) |
| September 30 | 80.1°F (1980) | 21.0°F (1964) | 0.50 in (1967) |