TODAY MAY06
TEMPERATURE50
HUMIDITY93
PRESSURE
WIND COND.34 3.2
  • 7048Thu
  • 7147Fri
  • 8050Sat
  • 7750Sun
  • 8151Mon
daynightWeather update from LOS ALTOS at

Key findings

  • The highest monthly average temperature in Atherton for July is 66.7 degrees
  • The lowest monthly average temperature in Atherton for January is 50.4 degrees
  • The most monthly precipitation in Atherton occurs in December with 2.6 inches
  • The air quality index in Atherton is 14% better than the national average
  • The pollution index in Atherton is 90% worse than the national average

Compare Atherton, CA Weather

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      Atherton 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
      January42°F61°F50°F2.4"
      February45°F63°F53°F2.4"
      March47°F67°F56°F2.0"
      April49°F70°F58°F1.3"
      May53°F73°F61°F0.3"
      June56°F77°F65°F0.2"
      July59°F78°F67°F0.0"
      August59°F78°F66°F0.0"
      September57°F80°F67°F0.1"
      October53°F75°F63°F0.7"
      November47°F67°F56°F1.3"
      December42°F60°F51°F2.6"

      Atherton 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.
      IndexAthertonCaliforniaNational
      Air quality index435550
      Pollution index9,645,61018,106,7265,066,862

      Atherton air quality information

      MeasurementTotal
      Days measured365
      Days with good air quality263
      Days with moderate air quality98
      Days w/ poor A.Q. for sensitive groups4
      Days with unhealthy air quality0

      Atherton air quality information

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

      Average monthly Atherton temperature with heat index

      Atherton monthly precipitation with daily maximum

      Atherton monthly snow depth with daily maximum

      Atherton monthly wind speed information

      Nearby cities with good air quality

      City, StatePopulationAir Quality IndexNational Avg.
      Pescadero, CA1,0403530%
      Loma Mar, CA1503530%
      South San Francisco, CA66,5874020%
      San Lorenzo, CA24,7904020%
      Hayward, CA154,5074314%
      Atherton, CA7,1274314%

      Cities with similar population

      City, StatePopulationAir Quality IndexNational Avg.
      Putnam, CT7,1293334%
      LaFayette, GA7,1304020%
      La Follette, TN7,1313922%
      Providence, UT7,1224412%
      Seward, NE7,1333138%
      Atherton, CA7,1274314%
      Source: The Atherton, 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.