TODAY MAR30
TEMPERATURE44
HUMIDITY69
PRESSURE
WIND COND.29 16.1
  • 6239Sat
  • 6541Sun
  • 7246Mon
  • 7948Tue
  • 6835Wed
daynightWeather update from OTHELLO at
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Weather Quick Facts

  • The highest monthly average temperature in Mattawa for July is 80.3 degrees
  • The lowest monthly average temperature in Mattawa for January is 29.9 degrees
  • The most monthly precipitation in Mattawa occurs in September with 2.3 inches
  • The air quality index in Mattawa is 10% better than the national average
  • The pollution index in Mattawa is 2% better than the national average

Compare Mattawa, WA Weather

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      Mattawa 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
      January23°F37°F30°F0.7"
      February28°F49°F38°F1.2"
      March37°F61°F49°F1.8"
      April40°F67°F54°F0.9"
      May50°F78°F65°F1.7"
      June55°F83°F69°F1.4"
      July64°F95°F80°F1.1"
      August60°F92°F76°F1.4"
      September51°F80°F66°F2.3"
      October42°F64°F53°F1.8"
      November32°F47°F40°F1.5"
      December25°F37°F31°F2.1"

      Mattawa 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.
      IndexMattawaWashingtonNational
      Air quality index383642
      Pollution index2,683,4104,541,8502,726,193

      Mattawa air quality information

      MeasurementTotal
      Days measured365
      Days with good air quality227
      Days with moderate air quality128
      Days w/ poor A.Q. for sensitive groups10
      Days with unhealthy air quality0

      Mattawa air quality information

      PollutantTotal
      Arsenic0.000%
      Benzene0.040%
      Carbon Tetrachloride0.004%
      Lead0.030%
      Mercury0.000%

      Average monthly Mattawa temperature with heat index

      Mattawa monthly precipitation with daily maximum

      Mattawa monthly snow depth with daily maximum

      Mattawa monthly wind speed information

      Nearby cities with good air quality

      CityPopulationAir Quality IndexNational Avg.
      Royal City, WA2,3841864.0%
      Vantage, WA02354.0%
      Desert Aire, WA2,7163824.0%
      Mattawa, WA5,0403824.0%

      Cities with similar population

      CityPopulationAir Quality IndexNational Avg.
      Gretna, NE5,0394020.0%
      Delhi Hills, OH5,041548.0%
      Rainsville, AL5,0383922.0%
      Hudson, TX5,0383628.0%
      Coverdale, NB5,038n/a 
      Mattawa, WA5,0403824.0%
      Source: The Mattawa, WA 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.