CA · climate averages
San Francisco Weather by Month
These are climate averages, not a forecast. Station San Francisco DWTN (USW00023272), 1.4 miles from downtown, elevation 150 ft.
San Francisco's warmest month is September (avg high 70.2°F), coldest is January (avg low 46.6°F) and wettest is December (4.76 in), per NOAA 1991–2020 climate normals.
- Warmest high September 70.2°F
- Coldest low January 46.6°F
- Wettest month December 4.76 in
- Year of rain 12 months 22.89 in
Monthly Averages
San Francisco's 12 monthly precipitation normals add up to 22.89 inches a year.
July is the driest month, with a precipitation normal of 0.01 inches.
San Francisco averages 71.2 days a year with at least 0.01 inch of precipitation.
| Month | Avg high | Avg low | Precipitation | Days ≥ 0.01 in |
|---|---|---|---|---|
| January | 57.8°F | 46.6°F | 4.40 in | 11.2 |
| February | 60.4°F | 47.9°F | 4.37 in | 10.8 |
| March | 62.1°F | 48.9°F | 3.15 in | 10.8 |
| April | 63.0°F | 49.7°F | 1.60 in | 6.8 |
| May | 64.1°F | 51.4°F | 0.70 in | 4.0 |
| June | 66.5°F | 53.0°F | 0.20 in | 1.6 |
| July | 66.3°F | 54.4°F | 0.01 in | 0.7 |
| August | 67.9°F | 55.5°F | 0.06 in | 1.1 |
| September | 70.2°F | 55.6°F | 0.10 in | 1.2 |
| October | 69.8°F | 54.4°F | 0.94 in | 3.5 |
| November | 63.7°F | 50.7°F | 2.60 in | 7.9 |
| December | 57.9°F | 47.0°F | 4.76 in | 11.6 |
Warmest, Coldest and Wettest Months
The warmest month is September, with an average high of 70.2°F.
The coldest month is January, with an average low of 46.6°F.
The wettest month is December, at 4.76 inches of precipitation over about 11.6 days.
No month in San Francisco reaches an average high of 80°F. The highest is 70.2°F in September.
In San Francisco, the warmest average high is only 23.6°F above the coldest average low.
In September, the average high in San Francisco is 14.6°F above the average low.
Best Months to Visit San Francisco for Weather
June, July, August, September and October meet the weather rule on this page: an average high from 65 to 85°F and precipitation below 1.91 inches.
The rule keeps a month when the average high is from 65 to 85°F and precipitation is below 1.91 inches, the mean of the twelve monthly precipitation normals.
- June · 66.5°F
- July · 66.3°F
- August · 67.9°F
- September · 70.2°F
- October · 69.8°F
Nearby cities
Los Angeles is the closest other city on this site, 347.7 miles away. Its July average high is 82.0°F, 15.7°F warmer than San Francisco.
| City | Miles | Avg high | Avg low | Precipitation |
|---|---|---|---|---|
| Los Angeles | 347.7 | 82.0°F | 64.7°F | 0.02 in |
| San Diego | 453.0 | 75.3°F | 66.1°F | 0.08 in |
About This Data
Source: NOAA National Centers for Environmental Information (NCEI), U.S. Climate Normals 1991–2020. Station: SAN FRANCISCO DWTN (USW00023272), 1.4 mi from downtown, elevation 150 ft. Climate normals are 30-year averages, not forecasts. MonthSky is not affiliated with NOAA.
Palecki, Michael; Durre, Imke; Applequist, Scott; Arguez, Anthony; Lawrimore, Jay (2021). U.S. Climate Normals 2020: U.S. Monthly Climate Normals (1991-2020). NOAA National Centers for Environmental Information. Dataset. https://doi.org/10.25921/wck8-er13. Accessed 2026-10-21.
U.S. Government work.
NOAA and NCEI cannot provide any warranty as to the accuracy, reliability, or completeness of furnished data. Users assume responsibility to determine the usability of these data. The user is responsible for the results of any application of this data for other than its intended purpose.
NOAA and NCEI make no warranty, expressed or implied, regarding these data, nor does the fact of distribution constitute such a warranty. NOAA and NCEI cannot assume liability for any damages caused by any errors or omissions in these data. If appropriate, NCEI can only certify that the data it distributes are an authentic copy of the records that were accepted for inclusion in the NCEI archives.
These pages are built automatically from public NOAA data.
U.S. Monthly Climate Normals (1991-2020) dataset
NCEI dataset landing page for the monthly normals
FAQ
What is the hottest month in San Francisco?
September is the warmest, with an average high of 70.2°F.
What is the wettest month in San Francisco?
December is the wettest, at 4.76 inches over about 11.6 days.
How many rainy days does San Francisco get a year?
The monthly counts of days with at least 0.01 inch of precipitation add up to 71.2 days.
When is the best time to visit San Francisco for weather?
June, July, August, September and October meet the rule used on this page: average high from 65 to 85°F and precipitation below the monthly mean of 1.91 inches.