Climateby Month

San Francisco vs Seattle weather

San Francisco, CA and Seattle, WA · 679 mi apart

July highs: 66°F in San Francisco, 77°F in Seattle (Seattle is 11°F warmer). January highs: 58°F and 47°F (San Francisco is 11°F warmer). San Francisco has about 71 wet days a year, Seattle about 163. Snow: 0.0 in a year in San Francisco, 3.8 in in Seattle.

San Francisco, CA

30°40°50°60°70°80° 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

Best months: July, August

Seattle, WA

30°40°50°60°70°80° January: normal high 47°F (8°C), low 37°F (3°C) 47° 37° February: normal high 50°F (10°C), low 37°F (3°C) March: normal high 54°F (12°C), low 39°F (4°C) April: normal high 59°F (15°C), low 43°F (6°C) May: normal high 65°F (18°C), low 48°F (9°C) June: normal high 70°F (21°C), low 53°F (12°C) July: normal high 77°F (25°C), low 57°F (14°C) 77° 57° August: normal high 77°F (25°C), low 57°F (14°C) September: normal high 71°F (22°C), low 53°F (12°C) October: normal high 61°F (16°C), low 47°F (8°C) November: normal high 52°F (11°C), low 41°F (5°C) December: normal high 47°F (8°C), low 37°F (3°C) JFMAMJJASOND

Best months: June, July, August

Which city for what

  • Milder winters: San Francisco (January high 58°F vs January high 47°F)
  • Cooler summers: San Francisco (July high 66°F vs July high 77°F)
  • Fewer wet days: San Francisco (71 a year vs 163 a year)
  • Less snow: San Francisco (0.0 in vs 3.8 in)
  • Longer growing season: San Francisco (365 frost-free days vs 259 frost-free days)
  • More comfortable days: San Francisco (151 a year vs 117 a year)

Listed only where the difference is at least 3°F in highs, 10 days a year or 3 in of snow.

Season by season

SeasonAvg high San FranciscoAvg high SeattleWet days San FranciscoWet days Seattle
Winter (Dec-Feb)59°F48°F3453
Spring (Mar-May)63°F59°F2246
Summer (Jun-Aug)67°F75°F322
Fall (Sep-Nov)68°F61°F1342

Side by side over a year

San FranciscoSeattle
Hot days (90°F+)32
Freezing nights025
Muggy days00
Comfortable days151117
Precipitation22.9 in37.8 in
Snowfall0.0 in3.8 in
Frost datesfrost-freelast Mar 8, first Nov 23
Daylight in June / December14.7 h / 9.6 h15.9 h / 8.5 h
Best monthsJuly, AugustJune, July, August

Day counts from each city's daily records, 1991-2020. Comfortable days: highs 65-80°F and dew point under 60°F.

Month by month

MonthHigh San FranciscoHigh SeattleWet days San FranciscoWet days Seattle
January58°F47°F1119
February60°F50°F1116
March62°F54°F1118
April63°F59°F716
May64°F65°F412
June67°F70°F211
July66°F77°F15
August68°F77°F16
September70°F71°F19
October70°F61°F415
November64°F52°F819
December58°F47°F1219

Both charts use the same temperature scale.

Where the numbers come from

  • San Francisco, CA: temperature from San Francisco Downtown (USW00023272), 0.5 mi SW of the city center; precipitation from San Francisco Downtown (USW00023272). NOAA 1991-2020 normals and daily records.
  • Seattle, WA: temperature from Seattle Sand Pt WSFO (USW00094290), 6.6 mi NNE of the city center; precipitation from Seattle Sand Pt WSFO (USW00094290). NOAA 1991-2020 normals and daily records.

Every station for each city, including humidity and frost, is listed on the city page. Methodology.