San Mateo, CA Weather - Forecast & Monthly Averages

TEMPERATURE	56
HUMIDITY	93
PRESSURE	101630
WIND COND.	130 16.6

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Weather Quick Facts

The highest monthly average temperature in San Mateo for September is 63.3 degrees
The lowest monthly average temperature in San Mateo for January is 50.7 degrees
The most monthly precipitation in San Mateo occurs in December with 4.4 inches
The air quality index in San Mateo is 2% worse than the national average
The pollution index in San Mateo is 254% worse than the national average

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San Mateo 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	58°F	51°F	3.2"
February	46°F	62°F	53°F	3.4"
March	47°F	64°F	54°F	2.7"
April	49°F	67°F	56°F	1.7"
May	51°F	69°F	58°F	0.3"
June	54°F	72°F	61°F	0.2"
July	56°F	73°F	62°F	0.0"
August	56°F	73°F	62°F	0.0"
September	56°F	76°F	63°F	0.1"
October	54°F	73°F	62°F	1.0"
November	49°F	65°F	56°F	1.7"
December	44°F	58°F	51°F	4.4"

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San Mateo 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 Mateo	California	National
Air quality index	43	55	42
Pollution index	9,645,610	10,473,190	2,726,193

San Mateo air quality

Measurement	Total
Days measured	365
Days with good air quality	263
Days with moderate air quality	98
Days w/ poor A.Q. for sensitive groups	4
Days with unhealthy air quality	0

Air quality details

Pollutant	Total
Arsenic	0.140%
Benzene	0.070%
Carbon Tetrachloride	0.000%
Lead	0.100%
Mercury	0.020%

Average monthly San Mateo temperature with heat index

San Mateo monthly precipitation with daily maximum

San Mateo monthly snow depth with daily maximum

San Mateo monthly wind speed information

Nearby cities with good air quality

City	Population	Air Quality Index	National Avg.
Ashland, CA	23,566	40	20.0%
Alameda, CA	79,827	40	20.0%
San Francisco, CA	874,784	40	20.0%
Castro Valley, CA	64,392	40	20.0%
San Leandro, CA	90,489	40	20.0%
San Mateo, CA	103,619	43	14.0%

Cities with similar population

City	Population	Air Quality Index	National Avg.
Rialto, CA	103,549	89	78.0%
Burbank, CA	103,411	72	44.0%
El Cajon, CA	103,249	64	28.0%
Allen, TX	104,040	51	2.0%
Las Cruces, NM	102,950	51	2.0%
San Mateo, CA	103,619	43	14.0%

Source: The San Mateo, 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.