September weather in Barstow, CA
The average temperature in Barstow in September is 78.3°F (63.3°F–93.3°F). Average precipitation: 0.25 inches.
September is a fall month in Barstow, and is warmer than the annual average of 65.7°F. Daily temperatures swing about 30°F between overnight low and afternoon high. Expect about 1 days with precipitation. Daylight averages about 12h 12m. For travel, September is hot.
Avg High
93.3°F
Avg Low
63.3°F
Precipitation
0.25 in
Daylight
12h 12m
September records in Barstow
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 108.0°F (2022) | 55.0°F (1999) | 0.03 in (1998) |
| September 2 | 109.9°F (2022) | 54.0°F (1989) | 0.13 in (1987) |
| September 3 | 109.0°F (1995) | 52.0°F (1983) | 2.25 in (1997) |
| September 4 | 106.0°F (2020) | 54.0°F (1985) | 0.71 in (1998) |
| September 5 | 108.0°F (2020) | 52.0°F (1985) | 0.01 in (1997) |
| September 6 | 109.9°F (2020) | 53.1°F (1985) | 0.40 in (2002) |
| September 7 | 111.9°F (2020) | 53.1°F (1985) | 0.60 in (1981) |
| September 8 | 107.1°F (2021) | 51.1°F (1987) | 0.03 in (2014) |
| September 9 | 106.0°F (1993) | 52.0°F (2018) | 0.08 in (2013) |
| September 10 | 107.1°F (2021) | 48.0°F (1985) | 0.31 in (1980) |
| September 11 | 105.1°F (1990) | 43.0°F (1985) | 1.36 in (1984) |
| September 12 | 104.0°F (1990) | 43.0°F (1985) | 0.44 in (1984) |
| September 13 | 105.1°F (2021) | 50.0°F (1985) | 0.04 in (1984) |
| September 14 | 104.0°F (1995) | 42.1°F (1982) | 0.00 in (1980) |
| September 15 | 102.9°F (1983) | 52.0°F (1986) | 0.27 in (2015) |
| September 16 | 102.9°F (1995) | 50.0°F (1987) | 0.12 in (2008) |
| September 17 | 102.9°F (2000) | 48.9°F (2006) | 0.00 in (1980) |
| September 18 | 104.0°F (2000) | 48.9°F (1996) | 0.56 in (1999) |
| September 19 | 102.9°F (1991) | 46.9°F (1989) | 0.50 in (2025) |
| September 20 | 100.9°F (2000) | 48.9°F (1986) | 0.70 in (2005) |
| September 21 | 100.0°F (2000) | 45.0°F (1986) | 0.02 in (2024) |
| September 22 | 100.0°F (2002) | 43.0°F (1986) | 0.07 in (1999) |
| September 23 | 100.0°F (1992) | 44.1°F (1986) | 0.21 in (1987) |
| September 24 | 100.0°F (1989) | 45.0°F (1980) | 0.00 in (1980) |
| September 25 | 100.9°F (1991) | 48.0°F (2005) | 0.82 in (1997) |
| September 26 | 100.9°F (2015) | 50.0°F (2007) | 0.35 in (1997) |
| September 27 | 100.9°F (2003) | 46.9°F (2013) | 0.11 in (2025) |
| September 28 | 102.0°F (2010) | 46.0°F (1982) | 0.01 in (2025) |
| September 29 | 100.9°F (2010) | 42.1°F (1989) | 0.00 in (1980) |
| September 30 | 100.0°F (1980) | 39.9°F (1982) | 0.09 in (1983) |