TODAY NOV24
TEMPERATURE
HUMIDITY
PRESSURE
WIND COND.232 14.5
  • 6247Sun50%80%
  • 5849Mon80%80%
  • 5944Tue70%50%
  • 5940Wed
  • 5841
daynightWeather update from LAS TRAMPAS at
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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

Compare Walnut Creek, CA Weather

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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.
      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"

      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 index405542
      Pollution index13,698,50010,473,1902,726,193

      Walnut Creek air quality

      MeasurementTotal
      Days measured365
      Days with good air quality290
      Days with moderate air quality74
      Days w/ poor A.Q. for sensitive groups1
      Days with unhealthy air quality0

      Air quality details

      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

      CityPopulationAir Quality IndexNational Avg.
      Alhambra Valley, CA1,0514020.0%
      Lafayette, CA25,9494020.0%
      Pacheco, CA4,7754020.0%
      San Miguel CDP (San Luis Obispo County), CA2,6964020.0%
      Ashland, CA23,5664020.0%
      Walnut Creek, CA69,8364020.0%

      Cities with similar population

      CityPopulationAir Quality IndexNational Avg.
      Passaic, NJ69,789512.0%
      Glen Burnie, MD69,649468.0%
      Greenville, SC69,648468.0%
      Marysville, WA69,6292452.0%
      Lynwood, CA69,6257244.0%
      Walnut Creek, CA69,8364020.0%
      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.