Climateby Month

San Francisco vs Portland weather

San Francisco, CA and Portland, OR · 536 mi apart

July highs: 66°F in San Francisco, 80°F in Portland (Portland is 14°F warmer). January highs: 58°F and 47°F (San Francisco is 11°F warmer). San Francisco has about 71 wet days a year, Portland about 156. Snow: 0.0 in a year in San Francisco, 4.2 in in Portland.

San Francisco, CA

30°40°50°60°70°80°90° 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

Portland, OR

30°40°50°60°70°80°90° January: normal high 47°F (8°C), low 37°F (3°C) February: normal high 51°F (11°C), low 39°F (4°C) March: normal high 56°F (13°C), low 41°F (5°C) April: normal high 61°F (16°C), low 44°F (7°C) May: normal high 68°F (20°C), low 49°F (9°C) June: normal high 73°F (23°C), low 53°F (12°C) July: normal high 80°F (27°C), low 58°F (14°C) August: normal high 81°F (27°C), low 59°F (15°C) 81° 59° September: normal high 75°F (24°C), low 55°F (13°C) October: normal high 63°F (17°C), low 48°F (9°C) November: normal high 52°F (11°C), low 42°F (6°C) December: normal high 46°F (8°C), low 37°F (3°C) 46° 37° JFMAMJJASOND

Best months: June

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 80°F)
  • Fewer wet days: San Francisco (71 a year vs 156 a year)
  • Less snow: San Francisco (0.0 in vs 4.2 in)
  • Longer growing season: San Francisco (365 frost-free days vs 247 frost-free days)
  • More comfortable days: San Francisco (151 a year vs 104 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 PortlandWet days San FranciscoWet days Portland
Winter (Dec-Feb)59°F48°F3453
Spring (Mar-May)63°F62°F2248
Summer (Jun-Aug)67°F78°F316
Fall (Sep-Nov)68°F63°F1338

Side by side over a year

San FranciscoPortland
Hot days (90°F+)312
Freezing nights018
Muggy days00
Comfortable days151104
Precipitation22.9 in36.9 in
Snowfall0.0 in4.2 in
Frost datesfrost-freelast Mar 13, first Nov 19
Daylight in June / December14.7 h / 9.6 h15.6 h / 8.8 h
Best monthsJuly, AugustJune

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 PortlandWet days San FranciscoWet days Portland
January58°F47°F1119
February60°F51°F1116
March62°F56°F1118
April63°F61°F717
May64°F68°F413
June67°F73°F29
July66°F80°F14
August68°F81°F14
September70°F75°F17
October70°F63°F414
November64°F52°F818
December58°F46°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.
  • Portland, OR: temperature from Portland Kgw-Tv (USC00356749), 0.7 mi WSW of the city center; precipitation from Portland Intl Airport (USW00024229). NOAA 1991-2020 normals and daily records.

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