TODAY AUG19
TEMPERATURE55
HUMIDITY89
PRESSURE29.98
WIND COND.
  • 6458Mon
  • 6657Tue
  • 6656Wed
  • 6755Thu
  • 6555Fri
daynightWeather update from San Francisco, San Francisco International Airport at

South San Francisco Average Weather

In the event that the weather data was unavailable for this city, estimates based upon nearby cities were used.
MonthTemp. (min)Temp. (max)Temp. (avg)Precipitation
January44°F58°F51°F3.2"
February46°F62°F53°F3.4"
March47°F64°F54°F2.7"
April49°F67°F56°F1.7"
May51°F69°F58°F0.3"
June54°F72°F61°F0.2"
July56°F73°F62°F0.0"
August56°F73°F62°F0.0"
September56°F76°F63°F0.1"
October54°F73°F62°F1.0"
November49°F65°F56°F1.7"
December44°F58°F51°F4.4"

Did you know?

  • The highest monthly average temperature in South San Francisco for September is 63 degrees.
  • The lowest monthly average temperature in South San Francisco for January is 51 degrees.
  • The most monthly precipitation in South San Francisco occurs in December with 4.4 inches.
  • The air quality index in South San Francisco is 13% better than the national average.
  • The pollution index in South San Francisco is 90% worse than the national average.

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Compare South San Francisco, CA Weather To Other Cities

South San Francisco air quality index & pollution index

In the event that the air quality/pollution data was unavailable for this city, estimates based upon nearby cities were used.
IndexSouth San FranciscoCaliforniaNational
Air quality index435550
Pollution index9,645,61018,106,7265,066,862

South San Francisco air quality information

MeasurementTotal
Days measured365
Days with good air quality241
Days with moderate air quality115
Days w/ poor A.Q. for sensitive groups9
Days with unhealthy air quality

South San Francisco air quality information

PollutantTotal
Arsenic0.140%
Benzene0.070%
Carbon Tetrachloride0.000%
Lead0.100%
Mercury0.020%

Average monthly South San Francisco temperature with heat index

South San Francisco monthly precipitation with daily maximum

South San Francisco monthly snow depth with daily maximum

South San Francisco monthly wind speed information

Nearby cities with good air quality

City, StatePopulationAir Quality IndexNational Avg.
Marin City, CA3,1154314%
Moraga, CA16,9774314%
Oakland, CA412,0404314%
San Leandro, CA89,0394314%
Alameda, CA77,4094314%
South San Francisco, CA66,5874314%

Cities with similar population

City, StatePopulationAir Quality IndexNational Avg.
Camarillo, CA66,630484%
Portland, ME66,6493824%
Palo Alto, CA66,649484%
Woodbury, MN66,6994412%
Oshkosh, WI66,7133628%
South San Francisco, CA66,5874314%
Source: The South San Francisco, CA weather data displayed above is derived from the NOAA (National Oceanic and Atmospheric). Air quality and pollution data is derived from the EPA (United States Environmental Protection Agency). Air quality and pollution levels measured in a particular area may not be representative of the entire county.