Bethel Island, CA Weather - Forecast & Monthly Averages

Get 300+ Local Insights for Any Address in Bethel Island, CA

Get Access to 300+ Local Data Points

TEMPERATURE
HUMIDITY
PRESSURE
WIND COND.	128 12.9

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

Compare Neighborhoods & Addresses

Why stop at city-to-city? With Local Insights, you can compare neighborhoods, zip codes, or even exact addresses. Access 300+ hyperlocal data points—from schools and crime to housing and amenities—to see which area is the better fit.

UNLOCK FULL COMPARISON →

Write a review to give others more information about this area.

See all Bethel Island poll results

Bethel Island Average Temperature

In the event that the weather data was unavailable for this city, estimates based upon nearby cities were used.
Month	Temp. _(min)	Temp. _(max)	Temp. _(avg)	Precipitation
January	39°F	60°F	48°F	2.5"
February	42°F	65°F	53°F	2.6"
March	46°F	69°F	56°F	2.7"
April	48°F	74°F	60°F	1.5"
May	52°F	79°F	63°F	0.1"
June	56°F	87°F	69°F	0.4"
July	58°F	90°F	71°F	0.0"
August	58°F	88°F	70°F	0.0"
September	57°F	88°F	70°F	0.1"
October	52°F	80°F	64°F	0.7"
November	44°F	67°F	54°F	1.6"
December	39°F	60°F	49°F	3.1"

The best places in California

Here are the best places to live in California

Check out the 10 most dangerous cities in California

Most Dangerous States In The US

Most Dangerous Cities In The US

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.
Index	Bethel Island	California	National
Air quality index	45	55	42
Pollution index	13,698,500	10,473,190	2,726,193

Bethel Island air quality

Measurement	Total
Days measured	365
Days with good air quality	229
Days with moderate air quality	123
Days w/ poor A.Q. for sensitive groups	12
Days with unhealthy air quality	1

Air quality details

Pollutant	Total
Arsenic	0.040%
Benzene	0.110%
Carbon Tetrachloride	0.330%
Lead	0.070%
Mercury	0.120%

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	Population	Air Quality Index	National Avg.
Pittsburg, CA	71,723	40	20.0%
Antioch, CA	111,468	45	10.0%
Knightsen, CA	1,100	45	10.0%
Isleton, CA	495	45	10.0%
Brentwood, CA	63,013	45	10.0%
Bethel Island, CA	2,015	45	10.0%

Cities with similar population

City	Population	Air Quality Index	National Avg.
Presquille, LA	2,015	41	18.0%
St. Bonaventure, NY	2,015	9	82.0%
Jonestown, TX	2,015	44	12.0%
Wilson-Conococheague, MD	2,014	40	20.0%
Steep Falls, ME	2,016	40	20.0%
Bethel Island, CA	2,015	45	10.0%

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.