Last updated: May 6, 2024
Under the Köppen–Geiger climate classification San Francisco features a tropical rainforest climate (Af).Temperatures typically range between 23 °C (73 °F) and 26 °C (80 °F) through the year, but rarely can drop to 17 °C (62 °F) or can rise to as high as 32 °C (89 °F).The average annual precipitation amounts to about 2310 mm (90.9 inches) and receives 243 rainy days on the 1 mm (0.04 inches) threshold annually.San Francisco enjoys an average of 3580 hours of sunshine throughout the year, and daylight varies from 11 hours 12 minutes to 13 hours 1 minutes per day.
The warmest months in San Francisco are May, June and September, with daily mean temperatures ranging from 26 to 26 °C (79 - 80 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from 23 to 23 °C (73 - 74 °F) throughout the day. On average each year, San Francisco experiences 270 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 | 29°C (85°F) | 29°C (84°F) | 29°C (84°F) | 31°C (88°F) | 31°C (88°F) | 32°C (89°F) | 30°C (85°F) | 31°C (88°F) | 30°C (87°F) | 30°C (86°F) | 28°C (83°F) | 28°C (84°F) |
Mean maximum | 28°C (82°F) | 28°C (82°F) | 28°C (83°F) | 30°C (86°F) | 30°C (87°F) | 30°C (86°F) | 29°C (84°F) | 29°C (85°F) | 29°C (85°F) | 30°C (86°F) | 27°C (82°F) | 27°C (81°F) |
Average high | 25°C (77°F) | 26°C (78°F) | 26°C (79°F) | 27°C (82°F) | 28°C (83°F) | 29°C (84°F) | 28°C (82°F) | 28°C (83°F) | 28°C (83°F) | 27°C (81°F) | 25°C (78°F) | 25°C (77°F) |
Daily mean | 23°C (73°F) | 23°C (74°F) | 24°C (75°F) | 25°C (78°F) | 26°C (79°F) | 26°C (80°F) | 26°C (79°F) | 26°C (79°F) | 26°C (79°F) | 25°C (78°F) | 24°C (75°F) | 23°C (73°F) |
Average low | 21°C (70°F) | 21°C (70°F) | 22°C (71°F) | 23°C (74°F) | 24°C (76°F) | 24°C (76°F) | 24°C (75°F) | 24°C (76°F) | 24°C (76°F) | 23°C (74°F) | 22°C (72°F) | 21°C (70°F) |
Mean minimum | 19°C (66°F) | 19°C (66°F) | 20°C (68°F) | 21°C (70°F) | 22°C (72°F) | 23°C (74°F) | 23°C (73°F) | 23°C (73°F) | 23°C (73°F) | 22°C (72°F) | 20°C (69°F) | 19°C (66°F) |
Minimum | 18°C (64°F) | 17°C (62°F) | 19°C (66°F) | 20°C (68°F) | 21°C (70°F) | 22°C (72°F) | 23°C (73°F) | 23°C (73°F) | 23°C (73°F) | 20°C (69°F) | 19°C (67°F) | 18°C (65°F) |
Compare temperature, precipitation, sunshine, UV index in San Francisco, Atlántida, Honduras with other places around the world.
San Francisco usually has the most precipitation in October, November and December, with an average of 23 rainy days and 337 mm (13.3 inches) of precipitation per month.The driest months in San Francisco are February, March and April. On average, 98 mm (3.9 inches) of precipitation falls during these months.
Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
---|---|---|---|---|---|---|---|---|---|---|---|---|
Average precipitation mm (inches) | 222 (8.7) | 112 (4.4) | 97 (3.8) | 85 (3.4) | 122 (4.8) | 178 (7.0) | 132 (5.2) | 167 (6.6) | 184 (7.3) | 333 (13.1) | 416 (16.4) | 262 (10.3) |
Average precipitation days (≥ 1 mm) | 16 | 10 | 11 | 10 | 22 | 25 | 25 | 27 | 27 | 27 | 24 | 19 |
The sunniest months in San Francisco are May, July and August, when the sun shines an average of 10 hours 34 minutes a day.Least sunny months in San Francisco: January, November and December receive an average of 8 hours 23 minutes of sunshine daily.
Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
---|---|---|---|---|---|---|---|---|---|---|---|---|
Mean monthly sunshine hours | 227 | 282 | 319 | 315 | 330 | 310 | 327 | 326 | 310 | 287 | 266 | 278 |
Mean daily daylight hours | 11h 18m | 11h 37m | 12h 2m | 12h 29m | 12h 51m | 13h 1m | 12h 55m | 12h 36m | 12h 11m | 11h 45m | 11h 23m | 11h 12m |
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 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 | |
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UV Index (month maximum) | 10 | 12 | 14 | 14 | 14 | 13 | 13 | 13 | 13 | 12 | 10 | 9 |