Castro Valley, CA Weather - Forecast & Monthly Averages

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Key findings

The highest monthly average temperature in Castro Valley for August is 64.4 degrees
The lowest monthly average temperature in Castro Valley for December is 49.2 degrees
The most monthly precipitation in Castro Valley occurs in January with 3.5 inches
The air quality index in Castro Valley is 20% better than the national average
The pollution index in Castro Valley is 136% worse than the national average

Compare Castro Valley, CA Weather

Castro Valley 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	42°F	58°F	50°F	3.5"
February	46°F	61°F	53°F	3.3"
March	46°F	64°F	54°F	2.6"
April	48°F	66°F	56°F	1.8"
May	52°F	69°F	59°F	0.6"
June	56°F	73°F	62°F	0.1"
July	57°F	75°F	64°F	0.0"
August	58°F	76°F	64°F	0.0"
September	57°F	76°F	64°F	0.2"
October	53°F	72°F	61°F	1.4"
November	48°F	66°F	56°F	1.3"
December	42°F	58°F	49°F	3.2"

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Castro Valley 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	Castro Valley	California	National
Air quality index	40	55	50
Pollution index	6,427,290	10,473,190	2,726,193

Castro Valley air quality information

Measurement	Total
Days measured	365
Days with good air quality	290
Days with moderate air quality	74
Days w/ poor A.Q. for sensitive groups	1
Days with unhealthy air quality	0

Castro Valley air quality information

Pollutant	Total
Arsenic	0.010%
Benzene	0.110%
Carbon Tetrachloride	0.010%
Lead	0.010%
Mercury	0.003%

Average monthly Castro Valley temperature with heat index

Castro Valley monthly precipitation with daily maximum

Castro Valley monthly snow depth with daily maximum

Castro Valley monthly wind speed information

Nearby cities with good air quality

City	Population	Air Quality Index	National Avg.
Castle Hill, CA	1,202	40	20.0%
Orinda, CA	18,936	40	20.0%
Shell Ridge, CA	1,123	40	20.0%
San Lorenzo, CA	24,790	40	20.0%
Alameda, CA	77,409	40	20.0%
Castro Valley, CA	62,825	40	20.0%

Cities with similar population

City	Population	Air Quality Index	National Avg.
Bowling Green, KY	62,824	43	14.0%
Greenville, SC	62,776	46	8.0%
Cheyenne, WY	62,879	43	14.0%
South Jordan, UT	62,751	51	2.0%
Waltham, MA	62,699	43	14.0%
Castro Valley, CA	62,825	40	20.0%

Source: The Castro Valley, 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.