Downtown, San Mateo, CA Weather - Forecast & Monthly Averages

TEMPERATURE	56
HUMIDITY	77
PRESSURE	101860
WIND COND.	280 20.5

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Weather Quick Facts

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

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Downtown 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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Downtown 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	Downtown	San Mateo	California
Air quality index	43	43	55
Pollution index	9,645,610	9,645,610	10,473,190

Downtown 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 Downtown temperature with heat index

Downtown monthly precipitation with daily maximum

Downtown monthly snow depth with daily maximum

Downtown monthly wind speed information

Nearby cities with good air quality

City	Population	Air Quality Index	National Avg.
Castro Valley, CA	64,392	40	20.0%
San Lorenzo, CA	30,117	40	20.0%
Brisbane, CA	4,645	40	20.0%
Daly City, CA	107,197	40	20.0%
Alameda, CA	79,827	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 Downtown, 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.