TODAY AUG19
TEMPERATURE
HUMIDITY
PRESSURE
WIND COND.248 8
  • 8656Mon
  • 8356Tue
  • 8656Wed
  • 8555Thu
  • 8455Fri
daynightWeather update from LAS TRAMPAS at

Walnut Creek Average Weather

In the event that the weather data was unavailable for this city, estimates based upon nearby cities were used.
MonthTemp. (min)Temp. (max)Temp. (avg)Precipitation
January39°F58°F48°F3.3"
February43°F62°F52°F3.0"
March45°F67°F54°F1.8"
April47°F71°F57°F1.9"
May52°F78°F63°F0.6"
June56°F85°F68°F0.0"
July58°F90°F71°F0.0"
August57°F90°F70°F0.0"
September56°F86°F68°F0.0"
October50°F77°F62°F1.4"
November45°F68°F55°F1.2"
December40°F57°F47°F2.3"

Did you know?

  • The highest monthly average temperature in Walnut Creek for July is 71 degrees.
  • The lowest monthly average temperature in Walnut Creek for December is 47 degrees.
  • The most monthly precipitation in Walnut Creek occurs in January with 3.3 inches.
  • The air quality index in Walnut Creek is 13% better than the national average.
  • The pollution index in Walnut Creek is 170% worse than the national average.

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Compare Walnut Creek, CA Weather To Other Cities

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.
IndexWalnut CreekCaliforniaNational
Air quality index435550
Pollution index13,698,50018,106,7265,066,862

Walnut Creek air quality information

MeasurementTotal
Days measured365
Days with good air quality241
Days with moderate air quality115
Days w/ poor A.Q. for sensitive groups9
Days with unhealthy air quality

Walnut Creek air quality information

PollutantTotal
Arsenic0.040%
Benzene0.110%
Carbon Tetrachloride0.330%
Lead0.070%
Mercury0.120%

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, StatePopulationAir Quality IndexNational Avg.
Alhambra Valley, CA5014314%
Benicia, CA27,7804314%
Castle Hill, CA1,2024314%
Concord, CA126,9384314%
Diablo, CA8074314%
Walnut Creek, CA67,5684314%

Cities with similar population

City, StatePopulationAir Quality IndexNational Avg.
Eau Claire, WI67,654355610%
Redondo Beach, CA67,6647448%
Yorba Linda, CA67,3628570%
Jackson, TN67,162335570%
Bossier City, LA67,1524314%
Walnut Creek, CA67,5684314%
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.