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Monthly climate in Sonoma, California, United States

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification Sonoma features a warm-summer Mediterranean climate (Csb).Temperatures typically range between 10 °C (50 °F) and 20 °C (68 °F) through the year, but rarely can drop to -1 °C (30 °F) or can rise to as high as 39 °C (102 °F).The average annual precipitation amounts to about 573 mm (22.5 inches) and receives 51 rainy days on the 1 mm (0.04 inches) threshold annually.Sonoma enjoys an average of 3393 hours of sunshine throughout the year, and daylight varies from 9 hours 31 minutes to 14 hours 46 minutes per day.

Monthly average temperatures in Sonoma, California, United States §

The warmest months in Sonoma are July, August and September, with daily mean temperatures ranging from 20 to 20 °C (68 - 68 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from 10 to 11 °C (50 - 52 °F) throughout the day. On average each year, Sonoma experiences 88 days above 25 °C (77.0 °F) and 1 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Sonoma, California, United States.Generated using Copernicus Climate Change Service information.Data for period from January 2017 to June 2022.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Maximum 24°C
(76°F)		 26°C
(79°F)		 27°C
(80°F)		 30°C
(86°F)		 34°C
(93°F)		 37°C
(99°F)		 36°C
(96°F)		 36°C
(98°F)		 39°C
(102°F)		 34°C
(94°F)		 27°C
(81°F)		 23°C
(73°F)
Mean maximum 20°C
(68°F)		 22°C
(72°F)		 24°C
(76°F)		 28°C
(82°F)		 30°C
(87°F)		 34°C
(93°F)		 33°C
(92°F)		 34°C
(93°F)		 35°C
(95°F)		 31°C
(88°F)		 24°C
(75°F)		 20°C
(67°F)
Average high 14°C
(58°F)		 17°C
(62°F)		 17°C
(63°F)		 20°C
(68°F)		 23°C
(73°F)		 26°C
(79°F)		 27°C
(80°F)		 27°C
(80°F)		 27°C
(80°F)		 24°C
(76°F)		 18°C
(65°F)		 14°C
(58°F)
Daily mean 10°C
(50°F)		 11°C
(52°F)		 12°C
(54°F)		 14°C
(58°F)		 17°C
(62°F)		 20°C
(68°F)		 20°C
(68°F)		 20°C
(68°F)		 20°C
(68°F)		 17°C
(63°F)		 12°C
(55°F)		 10°C
(50°F)
Average low 6°C
(43°F)		 6°C
(43°F)		 7°C
(45°F)		 9°C
(49°F)		 11°C
(52°F)		 14°C
(57°F)		 14°C
(57°F)		 14°C
(58°F)		 14°C
(57°F)		 11°C
(52°F)		 7°C
(46°F)		 6°C
(42°F)
Mean minimum 1°C
(33°F)		 0°C
(33°F)		 2°C
(36°F)		 4°C
(40°F)		 7°C
(46°F)		 11°C
(52°F)		 12°C
(53°F)		 12°C
(53°F)		 10°C
(50°F)		 6°C
(42°F)		 2°C
(36°F)		 1°C
(35°F)
Minimum -1°C
(31°F)		 -1°C
(30°F)		 1°C
(34°F)		 3°C
(38°F)		 5°C
(41°F)		 10°C
(50°F)		 11°C
(53°F)		 11°C
(52°F)		 9°C
(48°F)		 4°C
(40°F)		 1°C
(33°F)		 0°C
(33°F)

Compare climate in Sonoma with other places

Compare temperature, precipitation, sunshine, UV index in Sonoma, California, United States with other places around the world.

Monthly average precipitation in Sonoma, California, United States §

Sonoma usually has the most precipitation in January, February and December, with an average of 8 rainy days and 115 mm (4.5 inches) of precipitation per month.The driest months in Sonoma are July, August and September. On average, 1 mm (0.0 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Sonoma, California, United States.Generated using Copernicus Climate Change Service information.Data for period from January 2017 to January 2022.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Average precipitation mm (inches) 125 (4.9) 127 (5.0) 84 (3.3) 36 (1.4) 21 (0.8) 1 (0.1) 0 (0.0) 0 (0.0) 1 (0.0) 33 (1.3) 50 (2.0) 94 (3.7)
Average precipitation days (≥ 1 mm) 9 8 10 5 3 0 0 0 0 2 5 9

Monthly sunshine hours in Sonoma, California, United States §

The sunniest months in Sonoma are May, June and July, when the sun shines an average of 12 hours 20 minutes a day.Least sunny months in Sonoma: January, February and December receive an average of 5 hours 53 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Sonoma, California, United States.Generated using Copernicus Atmosphere Monitoring Service information.Data for period from January 2017 to January 2022.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Mean monthly sunshine hours 141 209 256 295 356 384 394 355 314 279 219 185
Mean daily daylight hours 9h 49m 10h 46m 11h 59m 13h 13m 14h 16m 14h 46m 14h 29m 13h 34m 12h 22m 11h 8m 10h 4m 9h 31m

Solar UV radiation in Sonoma, California, United States §

Sonoma experiences the highest level of ultraviolet (UV) radiation in June, July and August, when the maximum UV index can reach values of 10 - 11, which corresponds to the Very High / Extreme category of sun exposure.January, November and December are in the Moderate exposure category. In these months, the maximum values of the UV index do not exceed 4. For more detailed information, check out our hourly Sonoma UV Index data.

Average daily maximum UV levels by month for Sonoma, California, United States.Generated using Copernicus Atmosphere Monitoring Service information.Data for period from January 2022 to January 2023.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
UV Index (month maximum) 3 5 7 9 10 11 11 10 9 6 4 3