September weather in Pasadena, CA
The average temperature in Pasadena in September is 75.8°F (61.6°F–89.9°F). Average precipitation: 0.22 inches.
September is a fall month in Pasadena, and is warmer than the annual average of 66°F. Daily temperatures swing about 28.3°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
89.9°F
Avg Low
61.6°F
Precipitation
0.22 in
Daylight
12h 12m
September records in Pasadena
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 109.0°F (2017) | 48.9°F (1917) | 0.09 in (1913) |
| September 2 | 108.0°F (1982) | 48.9°F (1916) | 0.20 in (2023) |
| September 3 | 109.0°F (1988) | 46.9°F (1913) | 0.02 in (1931) |
| September 4 | 111.0°F (2022) | 43.0°F (1912) | 0.41 in (1963) |
| September 5 | 113.0°F (2020) | 44.1°F (1912) | 0.25 in (1978) |
| September 6 | 115.0°F (2020) | 42.1°F (1983) | 0.50 in (1965) |
| September 7 | 113.0°F (2020) | 45.0°F (1912) | 0.02 in (1976) |
| September 8 | 108.0°F (2024) | 43.0°F (1911) | 0.14 in (2014) |
| September 9 | 107.1°F (2024) | 45.0°F (1911) | 0.12 in (1982) |
| September 10 | 107.1°F (1948) | 45.0°F (1911) | 1.10 in (1976) |
| September 11 | 105.1°F (1971) | 46.9°F (1893) | 2.16 in (1976) |
| September 12 | 109.0°F (1971) | 44.1°F (1916) | 0.10 in (1923) |
| September 13 | 109.0°F (1971) | 45.0°F (1916) | 0.24 in (1918) |
| September 14 | 106.0°F (1971) | 46.9°F (1893) | 0.39 in (1918) |
| September 15 | 105.1°F (2014) | 46.0°F (1915) | 1.50 in (2015) |
| September 16 | 108.0°F (2000) | 45.0°F (1921) | 0.40 in (2015) |
| September 17 | 109.0°F (1913) | 45.0°F (1908) | 0.78 in (1950) |
| September 18 | 105.1°F (1939) | 45.0°F (1933) | 0.54 in (1929) |
| September 19 | 105.1°F (1939) | 44.1°F (1911) | 0.72 in (1989) |
| September 20 | 107.1°F (1939) | 43.0°F (1911) | 0.26 in (2005) |
| September 21 | 107.1°F (1987) | 46.0°F (1908) | 0.17 in (1983) |
| September 22 | 107.1°F (1943) | 48.0°F (1893) | 1.50 in (2007) |
| September 23 | 105.1°F (1944) | 45.0°F (1924) | 0.32 in (2000) |
| September 24 | 106.0°F (1978) | 43.0°F (1916) | 1.81 in (1908) |
| September 25 | 108.0°F (1963) | 44.1°F (1934) | 4.90 in (1939) |
| September 26 | 108.0°F (1963) | 42.1°F (1911) | 1.48 in (1982) |
| September 27 | 111.0°F (2010) | 41.0°F (1911) | 1.15 in (1919) |
| September 28 | 109.0°F (2010) | 42.1°F (1915) | 0.57 in (2002) |
| September 29 | 104.0°F (1999) | 42.1°F (1909) | 1.76 in (1911) |
| September 30 | 106.0°F (2001) | 43.0°F (1915) | 1.61 in (1983) |