September weather in Ross, CA
The average temperature in Ross in September is 67.4°F (52.7°F–82.1°F). Average precipitation: 0.09 inches.
September is a fall month in Ross, and is warmer than the annual average of 59.3°F. Daily temperatures swing about 29.4°F between overnight low and afternoon high. Expect about 1 days with precipitation. Daylight averages about 12h 14m. For travel, September is a comfortable month to visit.
Avg High
82.1°F
Avg Low
52.7°F
Precipitation
0.09 in
Daylight
12h 14m
September records in Ross
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 107.1°F (2017) | 39.9°F (1910) | 0.45 in (1916) |
| September 2 | 108.0°F (2017) | 39.9°F (1910) | 0.02 in (2023) |
| September 3 | 107.1°F (2017) | 41.0°F (1928) | 0.15 in (1940) |
| September 4 | 102.0°F (2008) | 42.1°F (1928) | 0.11 in (1907) |
| September 5 | 107.1°F (2022) | 41.0°F (1914) | 0.66 in (1912) |
| September 6 | 109.9°F (2022) | 41.0°F (1951) | 3.20 in (1912) |
| September 7 | 108.0°F (2020) | 39.0°F (1910) | 0.30 in (1912) |
| September 8 | 102.9°F (1936) | 39.9°F (1928) | 0.44 in (1919) |
| September 9 | 106.0°F (2022) | 37.9°F (1928) | 1.09 in (1978) |
| September 10 | 100.9°F (2015) | 39.0°F (1927) | 0.74 in (1978) |
| September 11 | 100.0°F (1924) | 39.0°F (1915) | 0.10 in (1952) |
| September 12 | 102.9°F (1979) | 37.9°F (1929) | 1.13 in (1918) |
| September 13 | 105.1°F (1971) | 35.1°F (1910) | 1.96 in (1918) |
| September 14 | 106.0°F (1971) | 37.0°F (1985) | 0.32 in (2009) |
| September 15 | 104.0°F (1971) | 39.0°F (1927) | 0.70 in (1910) |
| September 16 | 104.0°F (1913) | 39.9°F (1936) | 0.60 in (1989) |
| September 17 | 98.1°F (1935) | 39.9°F (1922) | 0.96 in (1989) |
| September 18 | 100.9°F (2000) | 39.0°F (1924) | 3.85 in (1959) |
| September 19 | 104.0°F (1919) | 37.9°F (1911) | 1.65 in (1959) |
| September 20 | 102.0°F (1939) | 39.9°F (1911) | 0.26 in (1973) |
| September 21 | 102.9°F (1939) | 37.0°F (1924) | 0.58 in (2013) |
| September 22 | 104.0°F (1939) | 39.0°F (1924) | 0.50 in (1973) |
| September 23 | 102.9°F (1939) | 39.0°F (1931) | 2.77 in (1904) |
| September 24 | 98.1°F (1936) | 37.9°F (1931) | 1.05 in (1904) |
| September 25 | 100.0°F (1964) | 37.9°F (1929) | 1.00 in (1904) |
| September 26 | 99.0°F (1921) | 36.0°F (1926) | 0.41 in (1904) |
| September 27 | 102.9°F (1921) | 34.0°F (1926) | 1.22 in (1957) |
| September 28 | 102.0°F (1921) | 36.0°F (1929) | 0.86 in (1977) |
| September 29 | 98.1°F (2020) | 36.0°F (1929) | 1.24 in (1909) |
| September 30 | 95.0°F (1966) | 37.9°F (1903) | 0.62 in (1983) |