Climateby Month

San Francisco, CA climate by month

NOAA 1991-2020 normals · 55 ft elevation · also covers Oakland, Berkeley, Richmond, Daly City

Highs in San Francisco peak at 70°F in September (mild) and bottom out at 58°F in January (cool). The wettest month is December (about 12 wet days) and the driest is July (about 1). The most comfortable time to visit is July and August.

Warmest month
70°F
September normal high
Coldest month
47°F
January normal low
Wet days a year
71
22.9 in of precipitation
Muggy days a year
0
dew point 65°F or higher

How warm is San Francisco?

Normal highs range from 58°F in January to 70°F in September.

40°50°60°70° January: normal high 58°F (14°C), low 47°F (8°C) 58° 47° February: normal high 60°F (16°C), low 48°F (9°C) March: normal high 62°F (17°C), low 49°F (9°C) April: normal high 63°F (17°C), low 50°F (10°C) May: normal high 64°F (18°C), low 51°F (11°C) June: normal high 67°F (19°C), low 53°F (12°C) July: normal high 66°F (19°C), low 54°F (12°C) August: normal high 68°F (20°C), low 56°F (13°C) September: normal high 70°F (21°C), low 56°F (13°C) 70° 56° October: normal high 70°F (21°C), low 54°F (12°C) November: normal high 64°F (18°C), low 51°F (11°C) December: normal high 58°F (14°C), low 47°F (8°C) JFMAMJJASOND

Bars run from the normal low to the normal high for each month.

How rainy is San Francisco?

December has the most wet days (about 12); the year brings about 23 in of precipitation.

January: 11 wet days February: 11 wet days March: 11 wet days April: 7 wet days May: 4 wet days June: 2 wet days July: 1 wet days 1 August: 1 wet days September: 1 wet days October: 4 wet days November: 8 wet days December: 12 wet days 12 JFMAMJJASOND

Wet day: at least 0.01 in of rain or melted snow, counted from daily records 1991-2020.

How humid is San Francisco?

Muggy days (dew point 65°F or higher) are rare in any month.

January: 0 muggy days 0 February: 0 muggy days March: 0 muggy days April: 0 muggy days May: 0 muggy days June: 0 muggy days July: 0 muggy days August: 0 muggy days September: 0 muggy days October: 0 muggy days November: 0 muggy days December: 0 muggy days JFMAMJJASOND

Muggy day: daily mean dew point of 65°F or higher, from hourly observations 1991-2020 at San Francisco International Airport, 11 mi SSE of the city center.

How much daylight?

Daylight ranges from about 9.6 hours in December to 14.7 hours in June.

January: 9.9 hours of daylight February: 10.8 hours of daylight March: 12.0 hours of daylight April: 13.2 hours of daylight May: 14.2 hours of daylight June: 14.7 hours of daylight 14.7 July: 14.5 hours of daylight August: 13.6 hours of daylight September: 12.4 hours of daylight October: 11.2 hours of daylight November: 10.2 hours of daylight December: 9.6 hours of daylight 9.6 JFMAMJJASOND
See all numbers
Monthly climate normals and day counts for San Francisco, 1991-2020
MonthHighLowPrecip.Wet daysMuggy daysDaylight
January 58°F47°F 4.4 in11 0 9.9 h
February 60°F48°F 4.4 in11 0 10.8 h
March 62°F49°F 3.1 in11 0 12.0 h
April 63°F50°F 1.6 in7 0 13.2 h
May 64°F51°F 0.7 in4 0 14.2 h
June 67°F53°F 0.2 in2 0 14.7 h
July 66°F54°F 0.01 in1 0 14.5 h
August 68°F56°F 0.06 in1 0 13.6 h
September 70°F56°F 0.1 in1 0 12.4 h
October 70°F54°F 0.9 in4 0 11.2 h
November 64°F51°F 2.6 in8 0 10.2 h
December 58°F47°F 4.8 in12 0 9.6 h

High and low: NOAA 1991-2020 normal daily high and low. Wet days: at least 0.01 in of rain or melted snow. Muggy days: daily mean dew point 65°F or higher.

Best months to visit San Francisco

By our comfort score, the best months are July and August.

Comfort score by month (0-100) and its parts, in days per month
MonthScoreComfortableNotable rainHot or cold
Jan 46480
Feb 53780
Mar 591070
Apr 64940
May 711120
Jun 801610
Jul 842000
Aug 842100
Sep 771901
Oct 721821
Nov 601250
Dec 44380

Score = 40 × share of comfortable days + 25 × share of days without notable rain + 20 × share of days neither hot (90°F+) nor cold (high 40°F or below) + 15 × daylight. How the score works.

Frost dates in San Francisco

San Francisco is frost-free: NOAA's 1991-2020 normals record no nights at 32°F or below at San Francisco Downtown.

Station: San Francisco Downtown (USW00023272), NOAA 1991-2020 freeze probabilities. Frost dates for every city in California.

Hottest and coldest readings, 1991-2020

The highest reading was 106°F (September 1, 2017); the lowest was 34°F (December 21, 1998).

From the temperature station's daily records with NOAA quality flags removed. Not an all-time record.

Near San Francisco

Similar climates elsewhere

Also covers

Oakland, Berkeley, Richmond and Daly City use the same temperature and rain stations as San Francisco, so their monthly numbers are the ones on this page.

Where the numbers come from

  • Temperature, rain and frost dates: San Francisco Downtown (USW00023272), 0.5 mi SW of the city center, 150 ft (95 ft higher than the city). NOAA normals and daily records, 1991-2020.
  • Snowfall and snow depth: San Francisco Oceanside (USC00047767), 5.7 mi SW of the city center, 8 ft . NOAA normals and daily records, 1991-2020.
  • Humidity and wind by hour and cloud cover: San Francisco Intl Airport (USW00023234), 11 mi SSE of the city center, 8 ft . NOAA normals and daily records, 1991-2020.
  • Daily humidity and wind: San Francisco International Airport (724940-23234), 11 mi SSE of the city center, 10 ft . Hourly observations, 1991-2020.

Distances from the city center (USGS). Methodology · Report an error