TODAY DEC22
TEMPERATURE52
HUMIDITY100
PRESSURE
WIND COND.184 4.8
  • 6454Mon80%
  • 6042Tue100%
  • 5545
  • 5648Thu
  • 5651Fri
daynightWeather update from BLACK DIAMOND at
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Weather Quick Facts

  • The highest monthly average temperature in Bethel Island for July is 70.8 degrees
  • The lowest monthly average temperature in Bethel Island for January is 48.3 degrees
  • The most monthly precipitation in Bethel Island occurs in December with 3.1 inches
  • The air quality index in Bethel Island is 7% worse than the national average
  • The pollution index in Bethel Island is 402% worse than the national average

Compare Bethel Island, CA Weather

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      Bethel Island 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
      January39°F60°F48°F2.5"
      February42°F65°F53°F2.6"
      March46°F69°F56°F2.7"
      April48°F74°F60°F1.5"
      May52°F79°F63°F0.1"
      June56°F87°F69°F0.4"
      July58°F90°F71°F0.0"
      August58°F88°F70°F0.0"
      September57°F88°F70°F0.1"
      October52°F80°F64°F0.7"
      November44°F67°F54°F1.6"
      December39°F60°F49°F3.1"

      Bethel Island 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.
      IndexBethel IslandCaliforniaNational
      Air quality index455542
      Pollution index13,698,50010,473,1902,726,193

      Bethel Island air quality

      MeasurementTotal
      Days measured365
      Days with good air quality229
      Days with moderate air quality123
      Days w/ poor A.Q. for sensitive groups12
      Days with unhealthy air quality1

      Air quality details

      PollutantTotal
      Arsenic0.040%
      Benzene0.110%
      Carbon Tetrachloride0.330%
      Lead0.070%
      Mercury0.120%

      Average monthly Bethel Island temperature with heat index

      Bethel Island monthly precipitation with daily maximum

      Bethel Island monthly snow depth with daily maximum

      Bethel Island monthly wind speed information

      Nearby cities with good air quality

      CityPopulationAir Quality IndexNational Avg.
      Pittsburg, CA71,7234020.0%
      Antioch, CA111,4684510.0%
      Knightsen, CA1,1004510.0%
      Isleton, CA4954510.0%
      Brentwood, CA63,0134510.0%
      Bethel Island, CA2,0154510.0%

      Cities with similar population

      CityPopulationAir Quality IndexNational Avg.
      Presquille, LA2,0154118.0%
      St. Bonaventure, NY2,015982.0%
      Jonestown, TX2,0154412.0%
      Wilson-Conococheague, MD2,0144020.0%
      Steep Falls, ME2,0164020.0%
      Bethel Island, CA2,0154510.0%
      Source: The Bethel Island, 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.