September weather in Grand Terrace, CA
The average temperature in Grand Terrace in September is 77.1°F (60.8°F–93.4°F). Average precipitation: 0.23 inches.
September is a fall month in Grand Terrace, and is warmer than the annual average of 66.6°F. Daily temperatures swing about 32.6°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
93.4°F
Avg Low
60.8°F
Precipitation
0.23 in
Daylight
12h 12m
September records in Grand Terrace
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 111.9°F (2002) | 50.0°F (1965) | 0.01 in (1995) |
| September 2 | 113.0°F (2007) | 48.9°F (1970) | 0.01 in (1967) |
| September 3 | 111.9°F (2007) | 48.9°F (1965) | 0.04 in (1950) |
| September 4 | 107.1°F (1984) | 46.0°F (1970) | 0.15 in (1963) |
| September 5 | 108.0°F (1984) | 50.0°F (1962) | 0.38 in (1963) |
| September 6 | 104.0°F (1977) | 48.0°F (1970) | 0.98 in (1978) |
| September 7 | 104.0°F (2004) | 50.0°F (1961) | 0.02 in (1958) |
| September 8 | 109.0°F (1979) | 44.1°F (1965) | 0.01 in (1982) |
| September 9 | 113.0°F (1979) | 44.1°F (1965) | 0.04 in (1984) |
| September 10 | 107.1°F (1979) | 46.9°F (1965) | 0.50 in (1976) |
| September 11 | 108.0°F (1979) | 46.9°F (1965) | 1.84 in (1976) |
| September 12 | 109.9°F (2000) | 44.1°F (1965) | 0.00 in (1948) |
| September 13 | 111.9°F (1971) | 45.0°F (1966) | 0.00 in (1948) |
| September 14 | 113.0°F (1971) | 44.1°F (1966) | 0.08 in (1997) |
| September 15 | 102.9°F (1979) | 46.0°F (1970) | 0.09 in (1997) |
| September 16 | 108.0°F (2000) | 48.0°F (1970) | 0.04 in (1982) |
| September 17 | 104.0°F (1958) | 51.1°F (1969) | 0.24 in (1963) |
| September 18 | 102.9°F (1979) | 48.0°F (1970) | 1.62 in (1963) |
| September 19 | 102.9°F (1979) | 43.0°F (1970) | 1.46 in (1963) |
| September 20 | 102.9°F (1958) | 42.1°F (1970) | 0.34 in (2005) |
| September 21 | 108.0°F (2003) | 42.1°F (1965) | 0.00 in (1948) |
| September 22 | 106.0°F (2002) | 46.0°F (1965) | 0.09 in (2000) |
| September 23 | 109.0°F (2002) | 46.9°F (1970) | 0.37 in (1987) |
| September 24 | 105.1°F (2001) | 46.0°F (1961) | 0.12 in (1986) |
| September 25 | 106.0°F (2009) | 48.0°F (1970) | 0.50 in (1997) |
| September 26 | 109.0°F (1963) | 46.9°F (1986) | 0.13 in (1982) |
| September 27 | 105.1°F (1963) | 48.0°F (1970) | 0.05 in (1982) |
| September 28 | 106.0°F (1963) | 46.9°F (1971) | 0.30 in (1951) |
| September 29 | 107.1°F (1963) | 44.1°F (1965) | 0.57 in (1983) |
| September 30 | 109.0°F (1980) | 46.9°F (1961) | 0.67 in (1983) |