September weather in Pomona, CA
The average temperature in Pomona in September is 74.6°F (60.4°F–88.7°F). Average precipitation: 0.01 inches.
September is a fall month in Pomona, and is warmer than the annual average of 65.1°F. Daily temperatures swing about 28.3°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
88.7°F
Avg Low
60.4°F
Precipitation
0.01 in
Daylight
12h 12m
September records in Pomona
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 109.9°F (1955) | 43.0°F (1941) | 0.00 in (1894) |
| September 2 | 109.9°F (1955) | 43.0°F (1914) | 0.00 in (1894) |
| September 3 | 109.0°F (1955) | 44.1°F (1921) | 0.16 in (1945) |
| September 4 | 107.1°F (1955) | 45.0°F (1925) | 0.61 in (1963) |
| September 5 | 109.0°F (1955) | 41.0°F (1919) | 0.15 in (1985) |
| September 6 | 111.9°F (1955) | 42.1°F (1933) | 1.43 in (1978) |
| September 7 | 109.9°F (1949) | 42.1°F (1933) | 0.07 in (1978) |
| September 8 | 109.9°F (1984) | 43.0°F (1914) | 0.10 in (1976) |
| September 9 | 105.1°F (1956) | 42.1°F (1900) | 0.09 in (1982) |
| September 10 | 113.0°F (1948) | 43.0°F (1920) | 0.57 in (1976) |
| September 11 | 107.1°F (1898) | 43.0°F (1919) | 2.11 in (1976) |
| September 12 | 105.1°F (1898) | 42.1°F (1952) | 0.07 in (1976) |
| September 13 | 108.0°F (1938) | 43.0°F (1916) | 0.02 in (1925) |
| September 14 | 107.1°F (1971) | 42.1°F (1939) | 0.04 in (1918) |
| September 15 | 106.0°F (1937) | 43.0°F (1914) | 0.02 in (1918) |
| September 16 | 108.0°F (1922) | 42.1°F (1921) | 0.10 in (1984) |
| September 17 | 109.9°F (1922) | 42.1°F (1919) | 0.94 in (1963) |
| September 18 | 106.0°F (1939) | 41.0°F (1933) | 0.55 in (1963) |
| September 19 | 106.0°F (1899) | 39.9°F (1925) | 0.85 in (1963) |
| September 20 | 108.0°F (1939) | 41.0°F (1925) | 0.40 in (1988) |
| September 21 | 106.0°F (1939) | 41.0°F (1924) | 0.50 in (1988) |
| September 22 | 109.0°F (1989) | 42.1°F (1924) | 0.03 in (1934) |
| September 23 | 109.9°F (1949) | 39.0°F (1941) | 0.09 in (1958) |
| September 24 | 106.0°F (1978) | 41.0°F (1923) | 1.25 in (1908) |
| September 25 | 108.0°F (1963) | 41.0°F (1934) | 2.60 in (1939) |
| September 26 | 109.0°F (1978) | 37.9°F (1948) | 1.35 in (1939) |
| September 27 | 111.0°F (2010) | 39.0°F (1948) | 0.63 in (1919) |
| September 28 | 107.1°F (1963) | 39.9°F (1934) | 0.14 in (1951) |
| September 29 | 105.1°F (1963) | 42.1°F (1913) | 0.68 in (1983) |
| September 30 | 104.0°F (1980) | 41.0°F (1925) | 1.00 in (1919) |