TODAY MAY12
TEMPERATURE73
HUMIDITY37
PRESSURE
WIND COND.270 14.5
  • 8753Thu
  • 8252Fri
  • 8255Sat
  • 8254Sun
  • 8053Mon
daynightWeather update from BLACK DIAMOND at

Key findings

  • 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 10% better than the national average
  • The pollution index in Bethel Island is 170% 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 index455550
      Pollution index13,698,50018,106,7265,066,862

      Bethel Island air quality information

      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

      Bethel Island air quality information

      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

      City, StatePopulationAir Quality IndexNational Avg.
      Pittsburg, CA67,9984020%
      Rio Vista, CA8,0554510%
      Byron, CA1,4294510%
      Terminous, CA3784510%
      Discovery Bay, CA14,7654510%
      Bethel Island, CA2,1994510%

      Cities with similar population

      City, StatePopulationAir Quality IndexNational Avg.
      Abram, TX2,2004216%
      Wellington, TX2,2004412%
      Idalou, TX2,2002550%
      St. Hedwig, TX2,200492%
      Lynchburg, MS2,1974510%
      Bethel Island, CA2,1994510%
      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.