Last updated: May 6, 2024
Under the Köppen–Geiger climate classification San Francisco features a tropical savanna climate (Aw).Temperatures typically range between 23 °C (73 °F) and 28 °C (83 °F) through the year, but rarely can drop to 10 °C (50 °F) or can rise to as high as 36 °C (96 °F).The average annual precipitation amounts to about 986 mm (38.8 inches) and receives 150 rainy days on the 1 mm (0.04 inches) threshold annually.San Francisco enjoys an average of 3623 hours of sunshine throughout the year, and daylight varies from 10 hours 52 minutes to 13 hours 21 minutes per day.
The warmest months in San Francisco are June, July and August, with daily mean temperatures ranging from 28 to 28 °C (82 - 83 °F) throughout the day. The coldest temperatures usually occur in January, November and December, when daily mean temperatures range from 23 to 24 °C (73 - 76 °F) throughout the day. On average each year, San Francisco experiences 322 days above 25 °C (77.0 °F) and 0 days below 0 °C (32.0 °F).
Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
---|---|---|---|---|---|---|---|---|---|---|---|---|
Maximum | 33°C (92°F) | 33°C (91°F) | 33°C (92°F) | 35°C (95°F) | 34°C (94°F) | 36°C (96°F) | 35°C (96°F) | 35°C (96°F) | 35°C (95°F) | 33°C (93°F) | 32°C (90°F) | 32°C (89°F) |
Mean maximum | 31°C (87°F) | 31°C (89°F) | 33°C (91°F) | 34°C (93°F) | 34°C (93°F) | 33°C (92°F) | 34°C (94°F) | 34°C (94°F) | 34°C (93°F) | 33°C (92°F) | 31°C (88°F) | 31°C (88°F) |
Average high | 28°C (82°F) | 29°C (85°F) | 30°C (87°F) | 32°C (90°F) | 32°C (90°F) | 32°C (89°F) | 33°C (92°F) | 33°C (91°F) | 32°C (91°F) | 31°C (88°F) | 29°C (85°F) | 28°C (83°F) |
Daily mean | 23°C (73°F) | 24°C (76°F) | 25°C (77°F) | 27°C (81°F) | 28°C (82°F) | 28°C (82°F) | 28°C (83°F) | 28°C (83°F) | 27°C (82°F) | 26°C (80°F) | 24°C (76°F) | 23°C (74°F) |
Average low | 19°C (67°F) | 20°C (69°F) | 21°C (69°F) | 23°C (73°F) | 24°C (75°F) | 25°C (77°F) | 24°C (76°F) | 24°C (76°F) | 24°C (76°F) | 23°C (74°F) | 21°C (70°F) | 19°C (67°F) |
Mean minimum | 12°C (54°F) | 14°C (57°F) | 15°C (59°F) | 17°C (64°F) | 20°C (68°F) | 23°C (74°F) | 23°C (73°F) | 23°C (73°F) | 22°C (73°F) | 19°C (67°F) | 16°C (61°F) | 13°C (55°F) |
Minimum | 10°C (51°F) | 10°C (50°F) | 14°C (57°F) | 15°C (60°F) | 16°C (60°F) | 22°C (72°F) | 22°C (72°F) | 22°C (73°F) | 22°C (72°F) | 16°C (61°F) | 13°C (56°F) | 11°C (52°F) |
Compare temperature, precipitation, sunshine, UV index in San Francisco, Quintana Roo, Mexico with other places around the world.
San Francisco usually has the most precipitation in June, September and October, with an average of 20 rainy days and 162 mm (6.4 inches) of precipitation per month.The driest months in San Francisco are February, March and December. On average, 23 mm (0.9 inches) of precipitation falls during these months.
Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
---|---|---|---|---|---|---|---|---|---|---|---|---|
Average precipitation mm (inches) | 38 (1.5) | 19 (0.8) | 15 (0.6) | 38 (1.5) | 89 (3.5) | 164 (6.5) | 87 (3.4) | 110 (4.3) | 148 (5.8) | 174 (6.9) | 67 (2.6) | 35 (1.4) |
Average precipitation days (≥ 1 mm) | 7 | 5 | 2 | 5 | 14 | 18 | 16 | 18 | 22 | 22 | 12 | 9 |
The sunniest months in San Francisco are April, May and July, when the sun shines an average of 10 hours 47 minutes a day.Least sunny months in San Francisco: January, February and October receive an average of 8 hours 48 minutes of sunshine daily.
Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
---|---|---|---|---|---|---|---|---|---|---|---|---|
Mean monthly sunshine hours | 230 | 280 | 323 | 323 | 341 | 297 | 329 | 322 | 298 | 290 | 292 | 294 |
Mean daily daylight hours | 11h 0m | 11h 27m | 12h 2m | 12h 37m | 13h 7m | 13h 21m | 13h 13m | 12h 47m | 12h 13m | 11h 38m | 11h 7m | 10h 52m |
San Francisco experiences the highest level of ultraviolet (UV) radiation in April, May and June, when the maximum UV index can reach values of 13 - 13, which corresponds to the Extreme category of sun exposure.January, November and December are in the High / Very High exposure category. In these months, the maximum values of the UV index do not exceed 8. For more detailed information, check out our hourly San Francisco UV Index data.
Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
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UV Index (month maximum) | 8 | 10 | 12 | 13 | 13 | 13 | 12 | 12 | 12 | 11 | 8 | 7 |