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Key findings

  • The highest monthly average temperature in Boise for August is 70 degrees
  • The lowest monthly average temperature in Boise for December is 40 degrees
  • The most monthly precipitation in Boise occurs in November with 6.2 inches
  • The air quality index in Boise is 24% better than the national average
  • The pollution index in Boise is 63% better than the national average

Compare Portland, OR Weather

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      Boise 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
      January34°F48°F40°F4.9"
      February36°F53°F43°F3.4"
      March39°F58°F48°F4.8"
      April42°F63°F52°F3.0"
      May48°F71°F58°F2.8"
      June53°F76°F63°F1.7"
      July57°F84°F69°F0.5"
      August58°F85°F70°F0.5"
      September53°F78°F64°F1.8"
      October47°F66°F55°F3.7"
      November40°F55°F47°F6.2"
      December34°F47°F40°F6.2"

      Boise 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.
      IndexBoisePortlandOregon
      Air quality index383832
      Pollution index1,899,4101,899,4105,374,527

      Boise air quality information

      MeasurementTotal
      Days measured365
      Days with good air quality285
      Days with moderate air quality77
      Days w/ poor A.Q. for sensitive groups3
      Days with unhealthy air quality0

      Boise air quality information

      PollutantTotal
      Arsenic0.003%
      Benzene0.020%
      Carbon Tetrachloride0.010%
      Lead0.010%
      Mercury0.002%

      Average monthly Boise temperature with heat index

      Boise monthly precipitation with daily maximum

      Boise monthly snow depth with daily maximum

      Boise monthly wind speed information

      Nearby cities with good air quality

      City, StatePopulationAir Quality IndexNational Avg.
      Maywood Park, OR9393824%
      Camas, WA21,3933824%
      Orchards, WA21,2493824%
      Garden Home-Whitford, OR6,2913824%
      Lake Oswego, OR38,0653824%
      Portland, OR620,5893824%

      Cities with similar population

      City, StatePopulationAir Quality IndexNational Avg.
      Baltimore, MD621,000468%
      Oklahoma City, OK620,015484%
      Las Vegas, NV613,295548%
      Louisville, KY611,573492%
      Milwaukee, WI598,6724412%
      Portland, OR620,5893824%
      Source: The Boise, Portland, OR 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.