September weather in Riverside, TX
The average temperature in Riverside in September is 77.2°F (67.3°F–87.1°F). Average precipitation: 4.47 inches.
September is a fall month in Riverside, and is warmer than the annual average of 66.5°F. Daily temperatures swing about 19.8°F between overnight low and afternoon high. Expect about 7 days with precipitation. Daylight averages about 12h 11m. For travel, September is a comfortable month to visit.
Avg High
87.1°F
Avg Low
67.3°F
Precipitation
4.47 in
Daylight
12h 11m
September records in Riverside
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 106.0°F (2000) | 57.9°F (1915) | 3.20 in (1981) |
| September 2 | 105.1°F (2000) | 53.1°F (1967) | 4.20 in (2003) |
| September 3 | 102.9°F (1951) | 54.0°F (1967) | 2.08 in (1943) |
| September 4 | 106.0°F (2000) | 54.0°F (1974) | 1.60 in (1923) |
| September 5 | 108.0°F (2000) | 48.9°F (1913) | 2.87 in (1973) |
| September 6 | 102.9°F (2000) | 50.0°F (1974) | 2.06 in (1962) |
| September 7 | 100.9°F (1947) | 50.0°F (1974) | 1.35 in (1933) |
| September 8 | 104.0°F (2023) | 50.0°F (2025) | 2.52 in (1977) |
| September 9 | 105.1°F (2023) | 54.0°F (1918) | 2.52 in (2001) |
| September 10 | 100.0°F (1905) | 51.1°F (1907) | 2.00 in (1990) |
| September 11 | 100.0°F (1905) | 55.0°F (1918) | 1.92 in (1998) |
| September 12 | 99.0°F (1963) | 48.9°F (1940) | 7.05 in (1961) |
| September 13 | 100.0°F (2011) | 39.9°F (1908) | 1.91 in (1913) |
| September 14 | 102.0°F (2011) | 53.1°F (1945) | 7.09 in (1974) |
| September 15 | 100.0°F (1965) | 52.0°F (1945) | 1.90 in (1949) |
| September 16 | 99.0°F (1980) | 53.1°F (1945) | 3.75 in (1966) |
| September 17 | 99.0°F (2006) | 48.9°F (1903) | 3.80 in (1964) |
| September 18 | 99.0°F (2006) | 48.0°F (1903) | 2.30 in (1923) |
| September 19 | 99.0°F (1905) | 51.1°F (1903) | 2.84 in (1996) |
| September 20 | 100.0°F (1956) | 42.1°F (1913) | 5.60 in (1979) |
| September 21 | 99.0°F (1937) | 41.0°F (1918) | 3.70 in (2019) |
| September 22 | 99.0°F (1944) | 42.1°F (1918) | 3.40 in (1995) |
| September 23 | 99.0°F (2005) | 43.0°F (1918) | 2.77 in (1997) |
| September 24 | 96.1°F (2022) | 46.0°F (1918) | 3.40 in (1941) |
| September 25 | 96.1°F (1954) | 45.0°F (1909) | 4.40 in (1960) |
| September 26 | 99.0°F (2005) | 46.0°F (2000) | 1.40 in (1951) |
| September 27 | 100.9°F (2005) | 42.1°F (1942) | 3.26 in (1996) |
| September 28 | 100.9°F (1953) | 39.0°F (2025) | 1.60 in (1976) |
| September 29 | 100.9°F (1953) | 44.1°F (1908) | 1.40 in (2013) |
| September 30 | 97.0°F (1953) | 41.0°F (1972) | 1.50 in (1934) |