Last updated: May 6, 2024
Under the Köppen–Geiger climate classification San Francisco features a tropical savanna climate (Aw).Temperatures typically range between 27 °C (82 °F) and 30 °C (87 °F) through the year, but rarely can drop to 21 °C (71 °F) or can rise to as high as 39 °C (102 °F).The average annual precipitation amounts to about 1957 mm (77.0 inches) and receives 158 rainy days on the 1 mm (0.04 inches) threshold annually.San Francisco enjoys an average of 3710 hours of sunshine throughout the year, and daylight varies from 11 hours 22 minutes to 12 hours 51 minutes per day.
The warmest months in San Francisco are February, March and April, with daily mean temperatures ranging from 30 to 30 °C (86 - 87 °F) throughout the day. The coldest temperatures usually occur in September, October and November, when daily mean temperatures range from 27 to 28 °C (82 - 83 °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 | 37°C (99°F) | 39°C (102°F) | 38°C (101°F) | 38°C (101°F) | 38°C (100°F) | 37°C (99°F) | 38°C (100°F) | 37°C (99°F) | 35°C (95°F) | 35°C (94°F) | 36°C (96°F) | 36°C (98°F) |
Mean maximum | 36°C (98°F) | 37°C (99°F) | 38°C (100°F) | 38°C (101°F) | 36°C (98°F) | 35°C (95°F) | 37°C (98°F) | 36°C (97°F) | 34°C (94°F) | 34°C (93°F) | 35°C (95°F) | 36°C (97°F) |
Average high | 34°C (94°F) | 35°C (96°F) | 36°C (97°F) | 35°C (95°F) | 33°C (92°F) | 33°C (91°F) | 34°C (94°F) | 33°C (92°F) | 32°C (90°F) | 31°C (89°F) | 32°C (91°F) | 34°C (94°F) |
Daily mean | 29°C (85°F) | 30°C (86°F) | 30°C (87°F) | 30°C (86°F) | 29°C (84°F) | 28°C (83°F) | 30°C (85°F) | 29°C (84°F) | 28°C (82°F) | 27°C (82°F) | 28°C (83°F) | 29°C (85°F) |
Average low | 25°C (78°F) | 25°C (78°F) | 26°C (79°F) | 26°C (79°F) | 26°C (78°F) | 25°C (78°F) | 26°C (79°F) | 25°C (78°F) | 25°C (77°F) | 25°C (77°F) | 25°C (78°F) | 25°C (78°F) |
Mean minimum | 23°C (73°F) | 23°C (73°F) | 24°C (75°F) | 24°C (76°F) | 24°C (75°F) | 24°C (76°F) | 24°C (75°F) | 24°C (75°F) | 24°C (75°F) | 23°C (74°F) | 23°C (74°F) | 23°C (73°F) |
Minimum | 21°C (71°F) | 22°C (72°F) | 23°C (73°F) | 23°C (74°F) | 24°C (75°F) | 23°C (74°F) | 23°C (74°F) | 23°C (74°F) | 23°C (74°F) | 23°C (73°F) | 23°C (73°F) | 22°C (72°F) |
Compare temperature, precipitation, sunshine, UV index in San Francisco, Chinandega, Nicaragua with other places around the world.
San Francisco usually has the most precipitation in June, September and October, with an average of 25 rainy days and 373 mm (14.7 inches) of precipitation per month.The driest months in San Francisco are January, February and March. On average, 5 mm (0.2 inches) of precipitation falls during these months.
Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
---|---|---|---|---|---|---|---|---|---|---|---|---|
Average precipitation mm (inches) | 4 (0.2) | 4 (0.2) | 6 (0.2) | 35 (1.4) | 257 (10.1) | 361 (14.2) | 125 (4.9) | 298 (11.7) | 341 (13.4) | 417 (16.4) | 103 (4.1) | 6 (0.2) |
Average precipitation days (≥ 1 mm) | 1 | 1 | 1 | 9 | 23 | 23 | 16 | 21 | 27 | 26 | 9 | 1 |
The sunniest months in San Francisco are March, July and December, when the sun shines an average of 10 hours 40 minutes a day.Least sunny months in San Francisco: January, February and October receive an average of 9 hours 22 minutes of sunshine daily.
Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
---|---|---|---|---|---|---|---|---|---|---|---|---|
Mean monthly sunshine hours | 264 | 296 | 331 | 323 | 314 | 297 | 332 | 319 | 302 | 291 | 309 | 328 |
Mean daily daylight hours | 11h 27m | 11h 42m | 12h 3m | 12h 24m | 12h 42m | 12h 51m | 12h 46m | 12h 30m | 12h 10m | 11h 49m | 11h 31m | 11h 22m |
San Francisco experiences the highest level of ultraviolet (UV) radiation in March, April and May, when the maximum UV index can reach values of 14 - 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 | 14 | 14 | 14 | 13 | 13 | 13 | 13 | 10 | 9 |