July weather in St. Helena, CA
The average temperature in St. Helena in July is 72.4°F (56.0°F–88.7°F). Average precipitation: 0.01 inches.
July is a summer month in St. Helena, and is warmer than the annual average of 61°F. Daily temperatures swing about 32.7°F between overnight low and afternoon high. Expect about 0 days with precipitation. Daylight averages about 14h 26m. For travel, July is hot.
Avg High
88.7°F
Avg Low
56.0°F
Precipitation
0.01 in
Daylight
14h 26m
July records in St. Helena
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| July 1 | 107.1°F (1950) | 37.9°F (2019) | 0.00 in (1909) |
| July 2 | 109.0°F (1991) | 41.0°F (1910) | 0.00 in (1909) |
| July 3 | 109.0°F (1931) | 37.9°F (2019) | 0.01 in (2015) |
| July 4 | 114.1°F (1931) | 37.9°F (2019) | 0.05 in (1925) |
| July 5 | 107.1°F (1931) | 39.0°F (1955) | 0.00 in (1909) |
| July 6 | 111.9°F (1921) | 41.0°F (1909) | 0.06 in (1936) |
| July 7 | 111.0°F (1919) | 39.9°F (1924) | 0.01 in (1936) |
| July 8 | 109.9°F (1921) | 41.0°F (1924) | 1.01 in (1974) |
| July 9 | 109.0°F (1925) | 39.9°F (1924) | 0.07 in (1974) |
| July 10 | 111.9°F (1925) | 42.1°F (1924) | 0.02 in (1952) |
| July 11 | 115.0°F (1913) | 41.0°F (1935) | 0.03 in (2007) |
| July 12 | 107.1°F (1990) | 41.0°F (1930) | 0.00 in (1909) |
| July 13 | 115.0°F (1972) | 39.0°F (1930) | 0.00 in (1909) |
| July 14 | 115.0°F (1972) | 43.0°F (1909) | 0.00 in (1909) |
| July 15 | 109.0°F (1926) | 44.1°F (1919) | 0.21 in (1975) |
| July 16 | 107.1°F (1926) | 37.0°F (1930) | 0.00 in (1909) |
| July 17 | 108.0°F (1961) | 33.1°F (1917) | 0.00 in (1909) |
| July 18 | 109.0°F (1931) | 42.1°F (1923) | 0.09 in (2007) |
| July 19 | 107.1°F (1933) | 43.0°F (1909) | 0.01 in (1956) |
| July 20 | 106.0°F (1917) | 39.0°F (2002) | 0.00 in (1909) |
| July 21 | 108.0°F (1939) | 43.0°F (1929) | 0.00 in (1909) |
| July 22 | 108.0°F (1916) | 39.9°F (1922) | 0.00 in (1909) |
| July 23 | 107.1°F (1942) | 39.9°F (1922) | 0.00 in (1909) |
| July 24 | 106.0°F (2006) | 26.1°F (2001) | 0.16 in (1937) |
| July 25 | 109.9°F (1975) | 39.9°F (1921) | 0.15 in (1946) |
| July 26 | 107.1°F (1973) | 42.1°F (1925) | 0.00 in (1909) |
| July 27 | 109.9°F (1923) | 42.1°F (1908) | 0.00 in (1909) |
| July 28 | 109.0°F (1954) | 42.1°F (1935) | 0.49 in (1958) |
| July 29 | 109.0°F (1977) | 42.1°F (1912) | 0.00 in (1909) |
| July 30 | 109.0°F (1977) | 39.9°F (1924) | 0.05 in (1966) |
| July 31 | 106.0°F (1908) | 39.9°F (1925) | 0.02 in (1949) |