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Best time to visit · California, United States
For the most comfortable weather in Napa, aim for April – June and September – November. October tops our comfort score at 100/100, with highs around 75°F (24°C) and 1.3 in (34 mm) of rain. July & August are good shoulder-season months. The toughest months are December & January, mainly because of rain.
Highs run from 54°F to 89°F across the year, and the yearly total is about 27.1 in (689 mm) of rain.
| Month | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high | 54°F12°C | 56°F14°C | 60°F16°C | 65°F18°C | 73°F23°C | 83°F28°C | 89°F32°C | 88°F31°C | 85°F30°C | 75°F24°C | 62°F17°C | 54°F12°C |
| Avg low | 37°F3°C | 39°F4°C | 41°F5°C | 43°F6°C | 47°F9°C | 53°F11°C | 56°F13°C | 55°F13°C | 54°F12°C | 49°F9°C | 42°F5°C | 37°F3°C |
| Rain | 4.7 in120 mm | 4.8 in123 mm | 3.8 in97 mm | 1.9 in47 mm | 0.9 in22 mm | 0.2 in6 mm | 0.0 in1 mm | 0.0 in1 mm | 0.1 in3 mm | 1.3 in34 mm | 2.8 in72 mm | 6.4 in163 mm |
| Humidity | 84% | 82% | 81% | 76% | 69% | 56% | 49% | 49% | 47% | 54% | 71% | 82% |
| Cloud | 55% | 53% | 52% | 44% | 35% | 22% | 19% | 21% | 21% | 31% | 45% | 57% |
| Comfort | 65 | 69 | 79 | 95 | 98 | 94 | 82 | 83 | 90 | 100 | 88 | 59 |
Source: NASA POWER (public domain), 2001–2025 monthly averages on a ~50 km satellite and reanalysis grid, so coasts and valleys can differ from what's shown. The grid cell sits at about 266 m (873 ft), close to Napa's own ~271 m. Precipitation includes snow as melted water; daylight is calculated from latitude. Check a forecast before you go.
The cold peaks here: highs of 54–56°F (12–14°C), and nights reach 37°F (3°C). It's the wettest season, with about 16.0 in (406 mm) of rain, 59% of the year's total. It holds the toughest stretch on our comfort score (December & January), averaging 64/100.
Temperatures climb through the season, from 60°F highs in March to 73°F by May. About 6.5 in (166 mm) of rain falls across these months, 24% of the year's total. Lows bottom out around 41°F (5°C). Comfort peaks here: April & May rank with the year's best, and the season averages 91/100.
The warmest stretch of the year, with highs of 83–89°F (28–32°C). It's the driest season, with only about 0.3 in (8 mm) of rain, 1% of the year's total. Lows bottom out around 53°F (11°C). June is among the best-scoring months (season average 86/100).
Temperatures slide from 85°F highs in September to 62°F by November. About 4.3 in (109 mm) of rain falls across these months, 16% of the year's total. Lows bottom out around 42°F (5°C). Comfort peaks here: September – November rank with the year's best, and the season averages 93/100.
By comfort score: 9 Great, 2 Good and 1 Fair. Great months: March – November. Tap a month for its own guide.
For the most comfortable weather in Napa, aim for April – June and September – November. October tops our comfort score at 100/100, with highs around 75°F (24°C) and 1.3 in (34 mm) of rain. July & August are good shoulder-season months. The toughest months are December & January, mainly because of rain.
December is the wettest month, averaging about 6.4 in (163 mm) of rain. July is the driest, with less than 0.1 in (3 mm). The yearly total is around 27.1 in (689 mm).
January is the coldest, with average lows of 37°F (3°C) and highs of 54°F (12°C). The warmest is July, with average highs of 89°F (32°C).
Not very: summer (June – August) humidity averages 51%, and highs peak around 89°F (32°C), so heat matters more than mugginess.
Not on average: even in January, the coldest month, lows average 37°F (3°C). Individual cold snaps can still dip lower.
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