Napa, CA
Climate overview — based on NOAA 1991-2020 normals from NAPA STATE HOSPITAL, CA US.
Year-round temperatures (°F)
Climate summary
Napa has an annual average temperature of 60.3°F with about 26.7 inches of precipitation per year. The warmest month is September (average high 84.4°F), and the coldest is December (average low 39.7°F). December is typically the wettest month (5.53 in) and July the driest (0.00 in).
Best time to visit Napa
Full guide →Climate change signal
All-time records →40 of 366 (10.9%) of Napa's all-time daily heat records have been set since 2015. If records were spread evenly across the station's history, only about 5% would fall in any given decade.
| 1890s | 14 | |
| 1900s | 21 | |
| 1910s | 15 | |
| 1920s | 42 | |
| 1930s | 34 | |
| 1940s | 27 | |
| 1950s | 31 | |
| 1960s | 32 | |
| 1970s | 26 | |
| 1980s | 27 | |
| 1990s | 20 | |
| 2000s | 30 | |
| 2010s | 20 | |
| 2020s | 27 |
Bars: number of all-time daily heat records still standing that were set in each decade.
Monthly averages
| Month | Avg High | Avg Low | Avg Temp | Precipitation | Snow | Rainy days |
|---|---|---|---|---|---|---|
| January | 58.6°F | 40.1°F | 49.4°F | 4.98 in | — | 12 |
| February | 63.2°F | 41.9°F | 52.5°F | 5.13 in | — | 11 |
| March | 67.5°F | 43.6°F | 55.5°F | 3.67 in | — | 10 |
| April | 72.1°F | 45.6°F | 58.8°F | 1.72 in | — | 7 |
| May | 76.6°F | 49.9°F | 63.2°F | 1.08 in | — | 4 |
| June | 82.3°F | 53.7°F | 68.0°F | 0.29 in | — | 1 |
| July | 83.3°F | 55.5°F | 69.4°F | 0.00 in | — | 0 |
| August | 83.7°F | 55.5°F | 69.6°F | 0.06 in | — | 0 |
| September | 84.4°F | 53.4°F | 68.9°F | 0.09 in | — | 1 |
| October | 78.1°F | 49.3°F | 63.7°F | 1.34 in | — | 4 |
| November | 66.2°F | 43.6°F | 54.9°F | 2.77 in | — | 8 |
| December | 58.5°F | 39.7°F | 49.1°F | 5.53 in | — | 12 |
Climate twins of Napa
Why these? →The most climatically similar US cities at least 140 miles away (by monthly temperature + precipitation pattern).