TODAY FEB26
TEMPERATURE
HUMIDITY
PRESSURE
WIND COND.253 1.6
  • 3818Sat
  • 4521Sun
  • 4823Mon20%
  • 4523Tue
  • 5027Wed
daynightWeather update from DENTEN CREEK at

Key findings

  • The highest monthly average temperature in Portola for July is 63 degrees
  • The lowest monthly average temperature in Portola for January is 26 degrees
  • The most monthly precipitation in Portola occurs in February with 13.5 inches
  • The air quality index in Portola is 12% better than the national average
  • The pollution index in Portola is 426% worse than the national average

Compare Portola, CA Weather

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      Portola 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
      January15°F41°F26°F13.4"
      February19°F45°F30°F13.5"
      March22°F49°F35°F8.0"
      April26°F55°F39°F5.9"
      May30°F64°F47°F4.9"
      June36°F74°F56°F3.2"
      July41°F82°F63°F6.3"
      August39°F81°F61°F3.8"
      September34°F75°F55°F3.6"
      October27°F63°F43°F11.2"
      November22°F51°F35°F6.3"
      December16°F41°F27°F10.8"

      Portola 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.
      IndexPortolaCaliforniaNational
      Air quality index445550
      Pollution index26,667,30018,106,7265,066,862

      Portola air quality information

      MeasurementTotal
      Days measured361
      Days with good air quality273
      Days with moderate air quality83
      Days w/ poor A.Q. for sensitive groups5
      Days with unhealthy air quality0

      Portola air quality information

      PollutantTotal
      Arsenic0.360%
      Benzene0.250%
      Carbon Tetrachloride0.100%
      Lead0.250%
      Mercury0.260%

      Average monthly Portola temperature with heat index

      Portola monthly precipitation with daily maximum

      Portola monthly snow depth with daily maximum

      Portola monthly wind speed information

      Nearby cities with good air quality

      City, StatePopulationAir Quality IndexNational Avg.
      Whitehawk, CA654412%
      C-Road, CA1164412%
      Graeagle, CA6364412%
      Mabie, CA454412%
      Loyalton, CA9164412%
      Portola, CA2,0824412%

      Cities with similar population

      City, StatePopulationAir Quality IndexNational Avg.
      Arlington, MN2,082468%
      Andrews, NC2,0823040%
      Gibbon, NE2,0811962%
      Three Forks, MT2,0832550%
      Hunter, TN2,0814510%
      Portola, CA2,0824412%
      Source: The Portola, 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.