San Dimas, CA Weather - Forecast & Monthly Averages

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Weather Quick Facts

The highest monthly average temperature in San Dimas for August is 77.8 degrees
The lowest monthly average temperature in San Dimas for December is 54.5 degrees
The most monthly precipitation in San Dimas occurs in December with 2.6 inches
The air quality index in San Dimas is 111% worse than the national average
The pollution index in San Dimas is 5017% worse than the national average

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San Dimas 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	44°F	69°F	56°F	2.3"
February	45°F	70°F	57°F	2.0"
March	48°F	74°F	60°F	1.2"
April	51°F	77°F	62°F	0.7"
May	55°F	81°F	66°F	0.4"
June	60°F	88°F	72°F	0.0"
July	65°F	94°F	77°F	0.1"
August	65°F	95°F	78°F	0.0"
September	64°F	93°F	76°F	0.2"
October	57°F	84°F	69°F	0.4"
November	49°F	77°F	62°F	0.6"
December	43°F	68°F	55°F	2.6"

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San Dimas 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	San Dimas	California	National
Air quality index	89	55	42
Pollution index	139,490,000	10,473,190	2,726,193

San Dimas air quality information

Measurement	Total
Days measured	365
Days with good air quality	42
Days with moderate air quality	178
Days w/ poor A.Q. for sensitive groups	79
Days with unhealthy air quality	58

San Dimas air quality information

Pollutant	Total
Arsenic	0.200%
Benzene	0.950%
Carbon Tetrachloride	0.080%
Lead	1.320%
Mercury	0.440%

Average monthly San Dimas temperature with heat index

San Dimas monthly precipitation with daily maximum

San Dimas monthly snow depth with daily maximum

San Dimas monthly wind speed information

Nearby cities with good air quality

City	Population	Air Quality Index	National Avg.
Industry, CA	264	72	44.0%
South San Jose Hills, CA	19,104	72	44.0%
West Covina, CA	105,808	72	44.0%
La Mirada, CA	48,260	72	44.0%
Whittier, CA	84,821	72	44.0%
San Dimas, CA	33,812	89	78.0%

Cities with similar population

City	Population	Air Quality Index	National Avg.
Ken Caryl, CO	33,815	58	16.0%
Newark, DE	33,822	42	16.0%
LaSalle, ON	33,838	n/a
Kearney, NE	33,783	19	62.0%
Dana Point, CA	33,782	89	78.0%
San Dimas, CA	33,812	89	78.0%

Source: The San Dimas, 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.