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Monthly climate in Sunnyvale, California, United States

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification Sunnyvale features a warm-summer Mediterranean climate (Csb).Temperatures typically range between 10 °C (50 °F) and 19 °C (67 °F) through the year, but rarely can drop to -1 °C (30 °F) or can rise to as high as 41 °C (106 °F).The average annual precipitation amounts to about 654 mm (25.8 inches) and receives 49 rainy days on the 1 mm (0.04 inches) threshold annually.Sunnyvale enjoys an average of 3450 hours of sunshine throughout the year, and daylight varies from 9 hours 38 minutes to 14 hours 39 minutes per day.

Monthly average temperatures in Sunnyvale, California, United States §

The warmest months in Sunnyvale are July, August and September, with daily mean temperatures ranging from 19 to 19 °C (66 - 67 °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, Sunnyvale experiences 67 days above 25 °C (77.0 °F) and 0 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Sunnyvale, 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
(75°F)		 25°C
(77°F)		 26°C
(79°F)		 31°C
(88°F)		 32°C
(90°F)		 37°C
(99°F)		 34°C
(93°F)		 39°C
(102°F)		 41°C
(106°F)		 34°C
(94°F)		 28°C
(83°F)		 24°C
(76°F)
Mean maximum 20°C
(68°F)		 22°C
(72°F)		 24°C
(76°F)		 27°C
(81°F)		 29°C
(85°F)		 33°C
(91°F)		 32°C
(89°F)		 34°C
(94°F)		 35°C
(96°F)		 31°C
(88°F)		 25°C
(77°F)		 21°C
(70°F)
Average high 15°C
(58°F)		 16°C
(61°F)		 17°C
(62°F)		 19°C
(66°F)		 21°C
(70°F)		 24°C
(76°F)		 26°C
(78°F)		 26°C
(79°F)		 26°C
(79°F)		 24°C
(75°F)		 19°C
(66°F)		 15°C
(59°F)
Daily mean 10°C
(51°F)		 11°C
(52°F)		 11°C
(53°F)		 13°C
(56°F)		 15°C
(59°F)		 18°C
(64°F)		 19°C
(66°F)		 19°C
(67°F)		 19°C
(67°F)		 17°C
(63°F)		 13°C
(56°F)		 10°C
(50°F)
Average low 6°C
(44°F)		 6°C
(43°F)		 7°C
(45°F)		 9°C
(48°F)		 10°C
(51°F)		 12°C
(55°F)		 13°C
(56°F)		 14°C
(58°F)		 14°C
(57°F)		 12°C
(53°F)		 8°C
(47°F)		 6°C
(43°F)
Mean minimum 1°C
(34°F)		 1°C
(34°F)		 2°C
(36°F)		 4°C
(40°F)		 7°C
(44°F)		 9°C
(48°F)		 11°C
(52°F)		 12°C
(53°F)		 9°C
(49°F)		 7°C
(45°F)		 3°C
(37°F)		 1°C
(35°F)
Minimum -0°C
(32°F)		 -1°C
(30°F)		 1°C
(34°F)		 3°C
(38°F)		 5°C
(40°F)		 8°C
(47°F)		 10°C
(50°F)		 11°C
(52°F)		 7°C
(45°F)		 5°C
(42°F)		 1°C
(34°F)		 1°C
(34°F)

Compare climate in Sunnyvale with other places

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

Monthly average precipitation in Sunnyvale, California, United States §

Sunnyvale usually has the most precipitation in January, February and December, with an average of 8 rainy days and 131 mm (5.2 inches) of precipitation per month.The driest months in Sunnyvale are June, July and August. On average, 1 mm (0.0 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Sunnyvale, 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) 145 (5.7) 133 (5.2) 114 (4.5) 37 (1.4) 24 (0.9) 1 (0.0) 0 (0.0) 0 (0.0) 3 (0.1) 25 (1.0) 56 (2.2) 116 (4.6)
Average precipitation days (≥ 1 mm) 8 8 12 4 2 0 0 0 0 1 5 9

Monthly sunshine hours in Sunnyvale, California, United States §

The sunniest months in Sunnyvale are May, June and July, when the sun shines an average of 12 hours 5 minutes a day.Least sunny months in Sunnyvale: January, February and December receive an average of 6 hours 28 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Sunnyvale, 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 161 222 268 302 360 373 379 347 310 286 232 205
Mean daily daylight hours 9h 55m 10h 49m 11h 59m 13h 10m 14h 10m 14h 39m 14h 23m 13h 30m 12h 21m 11h 10m 10h 9m 9h 38m

Solar UV radiation in Sunnyvale, California, United States §

Sunnyvale experiences the highest level of ultraviolet (UV) radiation in May, June and July, when the maximum UV index can reach values of 11 - 11, which corresponds to the Extreme category of sun exposure.January, February and December are in the Moderate exposure category. In these months, the maximum values of the UV index do not exceed 5. For more detailed information, check out our hourly Sunnyvale UV Index data.

Average daily maximum UV levels by month for Sunnyvale, 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) 4 5 8 9 11 11 11 10 9 7 5 3