September weather in Yountville, CA
The average temperature in Yountville in September is 68.0°F (51.2°F–84.8°F). Average precipitation: 0.07 inches.
September is a fall month in Yountville, and is warmer than the annual average of 59°F. Daily temperatures swing about 33.6°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
84.8°F
Avg Low
51.2°F
Precipitation
0.07 in
Daylight
12h 14m
September records in Yountville
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 109.9°F (1955) | 39.9°F (1957) | 0.01 in (2000) |
| September 2 | 107.1°F (1955) | 39.9°F (1957) | 0.06 in (2000) |
| September 3 | 102.9°F (1963) | 42.1°F (1964) | 0.00 in (1893) |
| September 4 | 105.1°F (1975) | 41.0°F (1954) | 0.08 in (1900) |
| September 5 | 107.1°F (2022) | 39.9°F (1969) | 0.00 in (1893) |
| September 6 | 109.9°F (2020) | 42.1°F (1973) | 0.38 in (1893) |
| September 7 | 109.0°F (1957) | 42.1°F (1952) | 0.02 in (1985) |
| September 8 | 107.1°F (1984) | 39.0°F (1952) | 0.32 in (1985) |
| September 9 | 109.0°F (1984) | 41.0°F (1964) | 0.36 in (1978) |
| September 10 | 106.0°F (1979) | 39.0°F (1952) | 0.07 in (1952) |
| September 11 | 105.1°F (1979) | 37.0°F (1952) | 0.08 in (1893) |
| September 12 | 109.0°F (1979) | 37.0°F (1893) | 0.03 in (1963) |
| September 13 | 109.9°F (1971) | 36.0°F (1970) | 0.00 in (1893) |
| September 14 | 109.0°F (1971) | 35.1°F (1970) | 0.55 in (1955) |
| September 15 | 106.0°F (1971) | 36.0°F (1970) | 0.18 in (1997) |
| September 16 | 102.9°F (1971) | 36.0°F (1970) | 0.77 in (1989) |
| September 17 | 102.9°F (1984) | 39.0°F (1970) | 0.36 in (1989) |
| September 18 | 100.9°F (2000) | 35.1°F (1965) | 2.70 in (1959) |
| September 19 | 102.0°F (1964) | 35.1°F (1965) | 0.40 in (1977) |
| September 20 | 100.0°F (1967) | 34.0°F (1965) | 0.26 in (1973) |
| September 21 | 102.0°F (2003) | 37.0°F (1965) | 0.35 in (2013) |
| September 22 | 102.9°F (2003) | 39.9°F (1965) | 0.20 in (1973) |
| September 23 | 102.0°F (1964) | 36.0°F (1972) | 1.92 in (1904) |
| September 24 | 102.9°F (1975) | 39.9°F (1958) | 0.94 in (1904) |
| September 25 | 102.0°F (1975) | 41.0°F (1955) | 0.83 in (1904) |
| September 26 | 102.9°F (1963) | 39.9°F (1953) | 0.57 in (1972) |
| September 27 | 100.0°F (1963) | 35.1°F (1955) | 1.44 in (1957) |
| September 28 | 102.0°F (1966) | 37.0°F (1971) | 0.50 in (1976) |
| September 29 | 100.0°F (1966) | 39.0°F (1954) | 0.30 in (1909) |
| September 30 | 102.0°F (2001) | 37.0°F (1953) | 0.65 in (1983) |