Last updated: May 6, 2024
Under the Köppen–Geiger climate classification San Francisco features a tropical monsoon climate (Am).Temperatures typically range between 24 °C (75 °F) and 31 °C (87 °F) through the year, but rarely can drop to 12 °C (54 °F) or can rise to as high as 44 °C (112 °F).The average annual precipitation amounts to about 1363 mm (53.6 inches) and receives 177 rainy days on the 1 mm (0.04 inches) threshold annually.San Francisco enjoys an average of 3364 hours of sunshine throughout the year, and daylight varies from 11 hours 7 minutes to 13 hours 6 minutes per day.
The warmest months in San Francisco are April, May and August, with daily mean temperatures ranging from 28 to 31 °C (83 - 87 °F) throughout the day. The coldest temperatures usually occur in January, November and December, when daily mean temperatures range from 24 to 25 °C (75 - 77 °F) throughout the day. On average each year, San Francisco experiences 321 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) | 40°C (104°F) | 40°C (104°F) | 44°C (111°F) | 44°C (112°F) | 40°C (105°F) | 39°C (103°F) | 42°C (107°F) | 38°C (101°F) | 37°C (99°F) | 35°C (95°F) | 36°C (96°F) |
Mean maximum | 34°C (94°F) | 36°C (98°F) | 39°C (102°F) | 42°C (108°F) | 43°C (109°F) | 38°C (100°F) | 38°C (100°F) | 38°C (100°F) | 36°C (98°F) | 35°C (96°F) | 33°C (92°F) | 34°C (93°F) |
Average high | 29°C (84°F) | 32°C (90°F) | 35°C (94°F) | 38°C (100°F) | 38°C (101°F) | 34°C (94°F) | 35°C (94°F) | 35°C (95°F) | 34°C (93°F) | 32°C (89°F) | 29°C (85°F) | 29°C (85°F) |
Daily mean | 24°C (75°F) | 25°C (78°F) | 27°C (81°F) | 30°C (87°F) | 31°C (87°F) | 28°C (83°F) | 28°C (83°F) | 28°C (83°F) | 28°C (82°F) | 27°C (80°F) | 25°C (77°F) | 24°C (75°F) |
Average low | 19°C (67°F) | 20°C (68°F) | 21°C (70°F) | 24°C (75°F) | 25°C (77°F) | 24°C (76°F) | 24°C (75°F) | 24°C (75°F) | 24°C (75°F) | 23°C (74°F) | 21°C (70°F) | 20°C (67°F) |
Mean minimum | 15°C (58°F) | 15°C (59°F) | 17°C (63°F) | 20°C (67°F) | 23°C (73°F) | 23°C (73°F) | 22°C (72°F) | 22°C (72°F) | 22°C (72°F) | 20°C (69°F) | 18°C (64°F) | 15°C (58°F) |
Minimum | 13°C (56°F) | 12°C (54°F) | 16°C (61°F) | 17°C (62°F) | 21°C (69°F) | 22°C (71°F) | 21°C (71°F) | 22°C (71°F) | 22°C (72°F) | 18°C (65°F) | 16°C (61°F) | 13°C (55°F) |
Compare temperature, precipitation, sunshine, UV index in San Francisco, Petén, Guatemala with other places around the world.
San Francisco usually has the most precipitation in June, September and October, with an average of 23 rainy days and 221 mm (8.7 inches) of precipitation per month.The driest months in San Francisco are February, March and April. On average, 31 mm (1.2 inches) of precipitation falls during these months.
Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
---|---|---|---|---|---|---|---|---|---|---|---|---|
Average precipitation mm (inches) | 43 (1.7) | 23 (0.9) | 31 (1.2) | 40 (1.6) | 104 (4.1) | 247 (9.7) | 136 (5.4) | 158 (6.2) | 215 (8.4) | 200 (7.9) | 110 (4.3) | 55 (2.2) |
Average precipitation days (≥ 1 mm) | 9 | 5 | 4 | 5 | 13 | 24 | 19 | 24 | 24 | 23 | 16 | 11 |
The sunniest months in San Francisco are May, July and August, when the sun shines an average of 10 hours 11 minutes a day.Least sunny months in San Francisco: January, February and November receive an average of 7 hours 56 minutes of sunshine daily.
Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
---|---|---|---|---|---|---|---|---|---|---|---|---|
Mean monthly sunshine hours | 205 | 256 | 300 | 309 | 320 | 279 | 313 | 314 | 288 | 269 | 252 | 256 |
Mean daily daylight hours | 11h 14m | 11h 35m | 12h 2m | 12h 31m | 12h 54m | 13h 6m | 12h 59m | 12h 38m | 12h 11m | 11h 43m | 11h 19m | 11h 7m |
San Francisco experiences the highest level of ultraviolet (UV) radiation in April, August and September, 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 exposure category. In these months, the maximum values of the UV index do not exceed 10. 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) | 9 | 11 | 13 | 14 | 13 | 13 | 13 | 13 | 13 | 12 | 10 | 8 |