TODAY AUG14
TEMPERATURE71
HUMIDITY
PRESSURE
WIND COND.229 12
  • 8959Tue
  • 9060Wed
  • 9360Thu
  • 9460Fri
  • 9460Sat
daynightWeather update from BLACK DIAMOND at

Bethel Island 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
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"

Did you know?

  • The highest monthly average temperature in Bethel Island for July is 71 degrees.
  • The lowest monthly average temperature in Bethel Island for January is 48 degrees.
  • The most monthly precipitation in Bethel Island occurs in December with 3.1 inches.
  • The air quality index in Bethel Island is 14% worse than the national average.
  • The pollution index in Bethel Island is 170% worse than the national average.

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Compare Bethel Island, CA Weather To Other Cities

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 index575550
Pollution index13,698,50018,106,7265,066,862

Bethel Island air quality information

MeasurementTotal
Days measured365
Days with good air quality128
Days with moderate air quality207
Days w/ poor A.Q. for sensitive groups21
Days with unhealthy air quality9

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, CA67,9984314%
Brentwood, CA56,9235714%
Knightsen, CA1,6065714%
Terminous, CA3785714%
Byron, CA1,4295714%
Bethel Island, CA2,1995714%

Cities with similar population

City, StatePopulationAir Quality IndexNational Avg.
Abram, TX2,2003628%
Wellington, TX2,2004020%
Idalou, TX2,2002648%
St. Hedwig, TX2,2004510%
Lynchburg, MS2,1974412%
Bethel Island, CA2,1995714%
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.