May weather in Napa, CA
The average temperature in Napa in May is 63.2°F (49.9°F–76.6°F). Average precipitation: 1.08 inches.
May is a spring month in Napa, and is warmer than the annual average of 60.3°F. Daily temperatures swing about 26.7°F between overnight low and afternoon high. Expect about 4 days with precipitation. Daylight averages about 14h 5m. For travel, May is a comfortable month to visit.
Avg High
76.6°F
Avg Low
49.9°F
Precipitation
1.08 in
Daylight
14h 5m
May records in Napa
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| May 1 | 97.0°F (2015) | 33.1°F (1899) | 0.83 in (1995) |
| May 2 | 93.9°F (2017) | 34.0°F (1921) | 1.05 in (1905) |
| May 3 | 93.9°F (2017) | 32.0°F (1950) | 1.52 in (2003) |
| May 4 | 91.9°F (1990) | 34.0°F (1917) | 0.88 in (1951) |
| May 5 | 96.1°F (1987) | 32.0°F (1950) | 0.55 in (1956) |
| May 6 | 96.1°F (1987) | 33.1°F (1964) | 0.66 in (1994) |
| May 7 | 98.1°F (1987) | 34.0°F (1930) | 0.86 in (1994) |
| May 8 | 97.0°F (1931) | 34.0°F (1930) | 0.53 in (2005) |
| May 9 | 97.0°F (1931) | 32.0°F (1918) | 0.55 in (2005) |
| May 10 | 93.9°F (1941) | 34.0°F (1918) | 0.49 in (1917) |
| May 11 | 93.9°F (2021) | 34.0°F (1976) | 0.51 in (1942) |
| May 12 | 102.9°F (1976) | 37.9°F (1918) | 0.68 in (1925) |
| May 13 | 100.0°F (1976) | 39.0°F (1917) | 1.00 in (1941) |
| May 14 | 96.1°F (1976) | 32.0°F (1918) | 0.31 in (1944) |
| May 15 | 100.0°F (2008) | 34.0°F (1917) | 1.04 in (1996) |
| May 16 | 102.0°F (2008) | 36.0°F (1917) | 1.85 in (1996) |
| May 17 | 100.0°F (1997) | 37.0°F (1919) | 0.59 in (1944) |
| May 18 | 100.0°F (1997) | 30.0°F (1974) | 0.90 in (1925) |
| May 19 | 99.0°F (1897) | 36.0°F (1939) | 1.13 in (2019) |
| May 20 | 99.0°F (1931) | 34.0°F (1918) | 0.68 in (1912) |
| May 21 | 98.1°F (2000) | 37.0°F (1930) | 0.84 in (2006) |
| May 22 | 95.0°F (1943) | 37.0°F (2010) | 1.00 in (1958) |
| May 23 | 99.0°F (1943) | 36.0°F (1949) | 1.30 in (1960) |
| May 24 | 102.0°F (1982) | 37.0°F (1953) | 1.26 in (1931) |
| May 25 | 98.1°F (1951) | 37.0°F (1953) | 0.93 in (1906) |
| May 26 | 99.0°F (2020) | 32.0°F (1918) | 0.45 in (1946) |
| May 27 | 102.0°F (1984) | 37.0°F (1918) | 1.14 in (1906) |
| May 28 | 99.0°F (2020) | 37.0°F (1927) | 1.18 in (1990) |
| May 29 | 102.9°F (1950) | 39.0°F (1927) | 0.64 in (1921) |
| May 30 | 104.0°F (1910) | 39.0°F (1923) | 0.96 in (1940) |
| May 31 | 102.9°F (2001) | 39.0°F (1923) | 1.55 in (1995) |