Last updated: May 6, 2024
Under the Köppen–Geiger climate classification San Francisco features a tropical savanna climate (Aw).Temperatures typically range between 28 °C (83 °F) and 30 °C (86 °F) through the year, but rarely can drop to 22 °C (71 °F) or can rise to as high as 40 °C (105 °F).The average annual precipitation amounts to about 699 mm (27.5 inches) and receives 147 rainy days on the 1 mm (0.04 inches) threshold annually.San Francisco enjoys an average of 3666 hours of sunshine throughout the year, and daylight varies from 11 hours 30 minutes to 12 hours 43 minutes per day.
The warmest months in San Francisco are July, August and September, with daily mean temperatures ranging from 30 to 30 °C (85 - 86 °F) throughout the day. The coldest temperatures usually occur in January, October and November, when daily mean temperatures range from 28 to 29 °C (83 - 84 °F) throughout the day. On average each year, San Francisco experiences 329 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 | 36°C (97°F) | 37°C (98°F) | 37°C (99°F) | 37°C (99°F) | 40°C (105°F) | 37°C (99°F) | 37°C (100°F) | 37°C (100°F) | 37°C (99°F) | 36°C (97°F) | 35°C (96°F) | 35°C (96°F) |
Mean maximum | 35°C (95°F) | 36°C (97°F) | 36°C (97°F) | 36°C (97°F) | 36°C (97°F) | 36°C (97°F) | 37°C (98°F) | 37°C (98°F) | 36°C (98°F) | 35°C (95°F) | 34°C (94°F) | 35°C (95°F) |
Average high | 33°C (92°F) | 34°C (93°F) | 34°C (93°F) | 34°C (93°F) | 33°C (93°F) | 33°C (92°F) | 34°C (94°F) | 34°C (93°F) | 34°C (93°F) | 33°C (91°F) | 32°C (90°F) | 33°C (92°F) |
Daily mean | 28°C (83°F) | 29°C (84°F) | 29°C (84°F) | 29°C (85°F) | 29°C (85°F) | 29°C (85°F) | 30°C (86°F) | 30°C (86°F) | 30°C (85°F) | 29°C (84°F) | 28°C (83°F) | 29°C (84°F) |
Average low | 25°C (77°F) | 25°C (77°F) | 25°C (78°F) | 26°C (79°F) | 26°C (80°F) | 26°C (80°F) | 27°C (80°F) | 27°C (80°F) | 26°C (80°F) | 26°C (78°F) | 25°C (78°F) | 25°C (78°F) |
Mean minimum | 23°C (75°F) | 23°C (74°F) | 24°C (75°F) | 24°C (76°F) | 25°C (77°F) | 25°C (77°F) | 24°C (76°F) | 25°C (77°F) | 24°C (76°F) | 24°C (76°F) | 23°C (74°F) | 23°C (75°F) |
Minimum | 23°C (73°F) | 23°C (73°F) | 22°C (73°F) | 23°C (74°F) | 24°C (76°F) | 23°C (74°F) | 23°C (74°F) | 25°C (77°F) | 24°C (75°F) | 24°C (75°F) | 22°C (71°F) | 23°C (73°F) |
Compare temperature, precipitation, sunshine, UV index in San Francisco, Zulia, Venezuela with other places around the world.
San Francisco usually has the most precipitation in May, October and November, with an average of 19 rainy days and 106 mm (4.2 inches) of precipitation per month.The driest months in San Francisco are January, February and December. On average, 8 mm (0.3 inches) of precipitation falls during these months.
Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
---|---|---|---|---|---|---|---|---|---|---|---|---|
Average precipitation mm (inches) | 8 (0.3) | 3 (0.1) | 22 (0.9) | 40 (1.6) | 97 (3.8) | 80 (3.2) | 58 (2.3) | 74 (2.9) | 83 (3.3) | 117 (4.6) | 104 (4.1) | 13 (0.5) |
Average precipitation days (≥ 1 mm) | 2 | 0 | 3 | 9 | 18 | 19 | 14 | 17 | 22 | 22 | 17 | 4 |
The sunniest months in San Francisco are March, July and December, when the sun shines an average of 10 hours 41 minutes a day.Least sunny months in San Francisco: January, May and June receive an average of 9 hours 14 minutes of sunshine daily.
Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
---|---|---|---|---|---|---|---|---|---|---|---|---|
Mean monthly sunshine hours | 268 | 310 | 333 | 300 | 291 | 291 | 327 | 323 | 299 | 292 | 295 | 332 |
Mean daily daylight hours | 11h 34m | 11h 46m | 12h 3m | 12h 21m | 12h 36m | 12h 43m | 12h 39m | 12h 26m | 12h 9m | 11h 52m | 11h 37m | 11h 30m |
San Francisco experiences the highest level of ultraviolet (UV) radiation in March, April and August, when the maximum UV index can reach values of 13 - 14, which corresponds to the Extreme category of sun exposure.January, November and December are in the Very High / Extreme exposure category. In these months, the maximum values of the UV index do not exceed 11. 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 | |
---|---|---|---|---|---|---|---|---|---|---|---|---|
UV Index (month maximum) | 11 | 12 | 14 | 13 | 13 | 12 | 12 | 13 | 12 | 13 | 10 | 10 |