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

TEMPERATURE	53
HUMIDITY	94
PRESSURE
WIND COND.

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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 5% better than the national average
The pollution index in Downtown is 202% 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 Francisco	California
Air quality index	40	40	55
Pollution index	8,232,360	8,232,360	10,473,190

Downtown air quality

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

Air quality details

Pollutant	Total
Arsenic	0.010%
Benzene	0.060%
Carbon Tetrachloride	0.000%
Lead	0.010%
Mercury	0.010%

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.
San Leandro, CA	90,489	40	20.0%
Piedmont, CA	11,454	40	20.0%
Belvedere, CA	2,246	40	20.0%
Marin City, CA	3,040	40	20.0%
Stinson Beach, CA	583	40	20.0%
San Francisco, CA	874,784	40	20.0%

Cities with similar population

City	Population	Air Quality Index	National Avg.
Charlotte, NC	873,570	49	2.0%
Indianapolis, IN	869,387	54	8.0%
Columbus, OH	889,079	46	8.0%
Fort Worth, TX	892,221	51	2.0%
Jacksonville, FL	902,488	43	14.0%
San Francisco, CA	874,784	40	20.0%

Source: The Downtown, San Francisco, 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.