September weather in Riverside, CA
The average temperature in Riverside in September is 77.4°F (61.8°F–93.0°F). Average precipitation: 0.15 inches.
September is a fall month in Riverside, and is warmer than the annual average of 66.9°F. Daily temperatures swing about 31.2°F between overnight low and afternoon high. Expect about 0 days with precipitation. Daylight averages about 12h 12m. For travel, September is hot.
Avg High
93.0°F
Avg Low
61.8°F
Precipitation
0.15 in
Daylight
12h 12m
September records in Riverside
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 111.0°F (2007) | 46.0°F (1917) | 0.81 in (1893) |
| September 2 | 111.0°F (1982) | 46.0°F (1916) | 0.07 in (1945) |
| September 3 | 111.9°F (1955) | 45.0°F (1916) | 0.08 in (1931) |
| September 4 | 111.0°F (2007) | 42.1°F (1912) | 0.61 in (1963) |
| September 5 | 111.9°F (1955) | 42.1°F (1912) | 0.57 in (1978) |
| September 6 | 115.0°F (1955) | 46.0°F (1911) | 0.58 in (1978) |
| September 7 | 109.9°F (1904) | 44.1°F (1912) | 1.00 in (2014) |
| September 8 | 109.0°F (1944) | 45.0°F (1901) | 0.28 in (1982) |
| September 9 | 111.0°F (1979) | 43.0°F (1911) | 0.44 in (2015) |
| September 10 | 109.0°F (1948) | 44.1°F (1911) | 1.36 in (1976) |
| September 11 | 108.0°F (1955) | 45.0°F (1901) | 0.66 in (1976) |
| September 12 | 111.0°F (1971) | 39.9°F (1916) | 0.16 in (1939) |
| September 13 | 113.0°F (1971) | 42.1°F (1916) | 0.02 in (1959) |
| September 14 | 109.0°F (1938) | 35.1°F (1902) | 0.07 in (1918) |
| September 15 | 108.0°F (1913) | 37.0°F (1902) | 1.31 in (2015) |
| September 16 | 109.9°F (1922) | 44.1°F (1893) | 0.08 in (1982) |
| September 17 | 111.9°F (1922) | 43.0°F (1893) | 1.27 in (1963) |
| September 18 | 108.0°F (1917) | 42.1°F (1933) | 1.37 in (1963) |
| September 19 | 106.0°F (1939) | 42.1°F (1925) | 0.65 in (1963) |
| September 20 | 106.0°F (1943) | 44.1°F (1925) | 0.05 in (1988) |
| September 21 | 109.0°F (1943) | 42.1°F (1924) | 0.02 in (1914) |
| September 22 | 113.0°F (1943) | 43.0°F (1944) | 0.18 in (2007) |
| September 23 | 109.0°F (1949) | 41.0°F (1941) | 0.17 in (1987) |
| September 24 | 109.0°F (1949) | 42.1°F (1923) | 0.72 in (1908) |
| September 25 | 108.0°F (1921) | 41.0°F (1934) | 0.50 in (1997) |
| September 26 | 109.9°F (1921) | 39.0°F (1948) | 0.32 in (1982) |
| September 27 | 111.0°F (1921) | 39.9°F (1948) | 0.55 in (1919) |
| September 28 | 106.0°F (1924) | 42.1°F (1915) | 0.61 in (1919) |
| September 29 | 106.0°F (1924) | 41.0°F (1894) | 0.14 in (1919) |
| September 30 | 108.0°F (1980) | 42.1°F (1915) | 1.72 in (1921) |