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Best time to visit · California, United States
On the climate data, the best time to visit Sonoma is April – June and October & November, scoring up to 100/100 with highs around 78°F (26°C) and 1.3 in (34 mm) of rain in October. March and September are good shoulder-season months. The toughest month is December, mainly because of rain.
Highs run from 57°F to 92°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 | 57°F14°C | 59°F15°C | 63°F17°C | 67°F20°C | 76°F24°C | 86°F30°C | 92°F33°C | 91°F33°C | 88°F31°C | 78°F26°C | 65°F19°C | 57°F14°C |
| Avg low | 40°F5°C | 42°F5°C | 44°F7°C | 46°F8°C | 50°F10°C | 55°F13°C | 58°F15°C | 58°F15°C | 57°F14°C | 52°F11°C | 45°F7°C | 40°F5°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 | 70 | 74 | 84 | 95 | 98 | 88 | 75 | 76 | 83 | 100 | 91 | 63 |
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. Temperatures were adjusted from the grid cell's ~266 m (873 ft) to Sonoma's ~26 m (85 ft) elevation using the standard lapse rate of 6.5°C per 1,000 m. Precipitation includes snow as melted water; daylight is calculated from latitude. Check a forecast before you go.
The coldest season, with highs of 57–59°F (14–15°C) and lows down to 40°F (5°C). It's the wettest season, with about 16.0 in (406 mm) of rain, 59% of the year's total. Comfort scores bottom out in December; the season averages 69/100.
Temperatures climb through the season, from 63°F highs in March to 76°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 44°F (7°C). Comfort peaks here: April & May rank with the year's best, and the season averages 92/100.
The warmest stretch of the year, with highs of 86–92°F (30–33°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 55°F (13°C). June is among the best-scoring months (season average 80/100).
Temperatures slide from 88°F highs in September to 65°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 45°F (7°C). Comfort peaks here: October & November rank with the year's best, and the season averages 91/100.
By comfort score: 9 Great and 3 Good. Great months: March – November. Tap a month for its own guide.
On the climate data, the best time to visit Sonoma is April – June and October & November, scoring up to 100/100 with highs around 78°F (26°C) and 1.3 in (34 mm) of rain in October. March and September are good shoulder-season months. The toughest month is December, 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 40°F (5°C) and highs of 57°F (14°C). The warmest is July, with average highs of 92°F (33°C).
Not very: summer (June – August) humidity averages 51%, and highs peak around 92°F (33°C), so heat matters more than mugginess.
Not on average: even in January, the coldest month, lows average 40°F (5°C). Individual cold snaps can still dip lower.
Poll the group on April – June and October & November dates, then plan the days, packing and costs together.
