TODAY OCT10
TEMPERATURE50
HUMIDITY
PRESSURE101771.49
WIND COND.113 5.5
  • 6551Fri50%
  • 6650Sat40%20%
  • 6449Sun
  • 6449
  • 6348Tue
daynightWeather update from Eureka WFO at
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Weather Quick Facts

  • The highest monthly average temperature in Arcata for August is 56.5 degrees
  • The lowest monthly average temperature in Arcata for December is 46.6 degrees
  • The most monthly precipitation in Arcata occurs in December with 7.3 inches
  • The air quality index in Arcata is 36% better than the national average
  • The pollution index in Arcata is 107% worse than the national average

Compare Arcata, CA Weather

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      Arcata 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
      January38°F56°F47°F6.0"
      February39°F56°F48°F5.3"
      March40°F56°F48°F6.9"
      April40°F57°F49°F3.6"
      May44°F59°F52°F1.2"
      June47°F62°F55°F0.7"
      July50°F63°F56°F0.2"
      August50°F64°F57°F0.2"
      September47°F65°F56°F0.5"
      October45°F64°F54°F3.4"
      November42°F59°F51°F5.2"
      December37°F55°F47°F7.3"

      Arcata 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.
      IndexArcataCaliforniaNational
      Air quality index275542
      Pollution index5,642,31010,473,1902,726,193

      Arcata air quality

      MeasurementTotal
      Days measured363
      Days with good air quality353
      Days with moderate air quality10
      Days w/ poor A.Q. for sensitive groups0
      Days with unhealthy air quality0

      Air quality details

      PollutantTotal
      Arsenic0.060%
      Benzene0.080%
      Carbon Tetrachloride0.000%
      Lead0.050%
      Mercury0.050%

      Average monthly Arcata temperature with heat index

      Arcata monthly precipitation with daily maximum

      Arcata monthly snow depth with daily maximum

      Arcata monthly wind speed information

      Nearby cities with good air quality

      CityPopulationAir Quality IndexNational Avg.
      Eureka, CA26,9382746.0%
      Manila, CA7622746.0%
      Westhaven-Moonstone, CA1,3022746.0%
      Humboldt Hill, CA3,4352746.0%
      Bayview CDP (Contra Costa County), CA1,7532746.0%
      Arcata, CA18,2662746.0%

      Cities with similar population

      CityPopulationAir Quality IndexNational Avg.
      Hyattsville, MD18,267476.0%
      Bensenville, IL18,2735510.0%
      San Carlos Park, FL18,2563628.0%
      Schofield Barracks, HI18,2763040.0%
      Menasha, WI18,2803726.0%
      Arcata, CA18,2662746.0%
      Source: The Arcata, 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.