Walnut Creek, CA Weather - Forecast & Monthly Averages

TEMPERATURE	59
HUMIDITY	27
PRESSURE
WIND COND.	49 6.4

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Weather Quick Facts

The highest monthly average temperature in Walnut Creek for July is 70.8 degrees
The lowest monthly average temperature in Walnut Creek for December is 47.3 degrees
The most monthly precipitation in Walnut Creek occurs in January with 3.3 inches
The air quality index in Walnut Creek is 5% better than the national average
The pollution index in Walnut Creek is 402% worse than the national average

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Walnut Creek 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	39°F	58°F	48°F	3.3"
February	43°F	62°F	52°F	3.0"
March	45°F	67°F	54°F	1.8"
April	47°F	71°F	57°F	1.9"
May	52°F	78°F	63°F	0.6"
June	56°F	85°F	68°F	0.0"
July	58°F	90°F	71°F	0.0"
August	57°F	90°F	70°F	0.0"
September	56°F	86°F	68°F	0.0"
October	50°F	77°F	62°F	1.4"
November	45°F	68°F	55°F	1.2"
December	40°F	57°F	47°F	2.3"

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Walnut Creek 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	Walnut Creek	California	National
Air quality index	40	55	42
Pollution index	13,698,500	10,473,190	2,726,193

Walnut Creek 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	0.040%
Benzene	0.110%
Carbon Tetrachloride	0.330%
Lead	0.070%
Mercury	0.120%

Average monthly Walnut Creek temperature with heat index

Walnut Creek monthly precipitation with daily maximum

Walnut Creek monthly snow depth with daily maximum

Walnut Creek monthly wind speed information

Nearby cities with good air quality

City	Population	Air Quality Index	National Avg.
Piedmont, CA	11,454	40	20.0%
Crockett, CA	3,205	40	20.0%
Vallejo, CA	121,275	40	20.0%
El Cerrito CDP, CA	5,699	40	20.0%
Castle Hill, CA	1,164	40	20.0%
Walnut Creek, CA	69,836	40	20.0%

Cities with similar population

City	Population	Air Quality Index	National Avg.
Passaic, NJ	69,789	51	2.0%
Glen Burnie, MD	69,649	46	8.0%
Greenville, SC	69,648	46	8.0%
Marysville, WA	69,629	24	52.0%
Lynwood, CA	69,625	72	44.0%
Walnut Creek, CA	69,836	40	20.0%

Source: The Walnut Creek, 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.