September weather in Alameda, CA
The average temperature in Alameda in September is 64.8°F (55.5°F–74.1°F). Average precipitation: 0.10 inches.
September is a fall month in Alameda, and is warmer than the annual average of 58.1°F. Daily temperatures swing about 18.6°F between overnight low and afternoon high. Expect about 2 days with precipitation. Daylight averages about 12h 14m. For travel, September is one of the best months of the year to visit.
Avg High
74.1°F
Avg Low
55.5°F
Precipitation
0.10 in
Daylight
12h 14m
September records in Alameda
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 100.9°F (2017) | 50.0°F (1948) | 0.16 in (2000) |
| September 2 | 100.9°F (2017) | 46.9°F (2011) | 0.00 in (1948) |
| September 3 | 95.0°F (1961) | 48.0°F (2011) | 0.00 in (1948) |
| September 4 | 97.0°F (1961) | 48.9°F (2000) | 0.01 in (2001) |
| September 5 | 97.0°F (2022) | 48.9°F (2000) | 0.00 in (1948) |
| September 6 | 104.0°F (2020) | 48.9°F (2011) | 0.00 in (1948) |
| September 7 | 99.0°F (2020) | 45.0°F (2011) | 0.00 in (1948) |
| September 8 | 95.0°F (2015) | 51.1°F (2002) | 0.18 in (1985) |
| September 9 | 93.0°F (1951) | 48.9°F (2011) | 0.19 in (1978) |
| September 10 | 91.9°F (2017) | 50.0°F (2000) | 0.01 in (1985) |
| September 11 | 93.9°F (1974) | 50.0°F (1961) | 0.07 in (2017) |
| September 12 | 98.1°F (1979) | 50.0°F (2000) | 0.28 in (1963) |
| September 13 | 98.1°F (2003) | 50.0°F (1955) | 0.17 in (2009) |
| September 14 | 96.1°F (1971) | 50.0°F (1970) | 0.01 in (1954) |
| September 15 | 91.0°F (1971) | 46.9°F (1955) | 0.00 in (1948) |
| September 16 | 93.9°F (1968) | 46.9°F (2006) | 0.32 in (1961) |
| September 17 | 91.0°F (2000) | 48.9°F (2006) | 0.10 in (1985) |
| September 18 | 89.1°F (2016) | 48.0°F (1955) | 3.18 in (1959) |
| September 19 | 91.0°F (2011) | 48.9°F (1955) | 0.48 in (1977) |
| September 20 | 95.0°F (1949) | 46.9°F (2004) | 0.35 in (1973) |
| September 21 | 95.0°F (2003) | 48.0°F (2004) | 0.61 in (2013) |
| September 22 | 96.1°F (1949) | 46.9°F (2012) | 0.16 in (2007) |
| September 23 | 91.0°F (2025) | 1.2°F (2009) | 0.01 in (2001) |
| September 24 | 93.0°F (1978) | 1.2°F (2009) | 0.30 in (2001) |
| September 25 | 96.1°F (2019) | 44.1°F (1948) | 0.43 in (2014) |
| September 26 | 97.0°F (1958) | 44.1°F (1948) | 0.57 in (1972) |
| September 27 | 99.0°F (2020) | 46.0°F (1948) | 0.58 in (1957) |
| September 28 | 100.0°F (2010) | 48.9°F (1948) | 0.32 in (1976) |
| September 29 | 89.1°F (1978) | 46.9°F (1950) | 0.05 in (1971) |
| September 30 | 93.0°F (1980) | 41.0°F (1950) | 0.46 in (1983) |