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Key findings

  • The highest monthly average temperature in South San Francisco for September is 63.3 degrees
  • The lowest monthly average temperature in South San Francisco for January is 50.7 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 20% better than the national average
  • The pollution index in South San Francisco is 254% worse than the national average

Compare South San Francisco, CA Weather

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      South San Francisco Average Temperature

      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"

      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 index405550
      Pollution index9,645,61010,473,1902,726,193

      South San Francisco air quality information

      MeasurementTotal
      Days measured365
      Days with good air quality290
      Days with moderate air quality74
      Days w/ poor A.Q. for sensitive groups1
      Days with unhealthy air quality0

      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

      CityPopulationAir Quality IndexNational Avg.
      San Leandro, CA89,0394020.0%
      Brisbane, CA4,5684020.0%
      Daly City, CA105,5434020.0%
      Muir Beach, CA2484020.0%
      Ashland, CA24,2884020.0%
      South San Francisco, CA66,5874020.0%

      Cities with similar population

      CityPopulationAir Quality IndexNational Avg.
      Camarillo, CA66,630468.0%
      Palo Alto, CA66,6494314.0%
      Portland, ME66,6494020.0%
      Port Coquitlam, BC66,485n/a 
      Woodbury, MN66,699468.0%
      South San Francisco, CA66,5874020.0%
      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.