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Key findings

  • The highest monthly average temperature in National Harbor for July is 80.8 degrees
  • The lowest monthly average temperature in National Harbor for January is 37.1 degrees
  • The most monthly precipitation in National Harbor occurs in June with 5.3 inches
  • The air quality index in National Harbor is 5% better than the national average
  • The pollution index in National Harbor is 2% worse than the national average

Compare National Harbor, MD Weather

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      National Harbor 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
      January28°F47°F37°F2.7"
      February29°F50°F38°F2.3"
      March37°F60°F47°F3.2"
      April47°F71°F58°F3.4"
      May56°F78°F67°F4.6"
      June67°F87°F77°F5.3"
      July72°F91°F81°F4.2"
      August70°F90°F79°F3.2"
      September63°F83°F72°F3.5"
      October52°F72°F61°F5.0"
      November40°F61°F50°F2.5"
      December33°F52°F42°F3.8"

      National Harbor 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.
      IndexNational HarborMarylandNational
      Air quality index474350
      Pollution index2,776,5905,342,3672,726,193

      National Harbor air quality information

      MeasurementTotal
      Days measured365
      Days with good air quality209
      Days with moderate air quality145
      Days w/ poor A.Q. for sensitive groups10
      Days with unhealthy air quality1

      National Harbor air quality information

      PollutantTotal
      Arsenic0.070%
      Benzene0.020%
      Carbon Tetrachloride0.010%
      Lead0.020%
      Mercury0.030%

      Average monthly National Harbor temperature with heat index

      National Harbor monthly precipitation with daily maximum

      National Harbor monthly snow depth with daily maximum

      National Harbor monthly wind speed information

      Nearby cities with good air quality

      CityPopulationAir Quality IndexNational Avg.
      Baden, MD1,906476.0%
      Andrews AFB, MD3,336476.0%
      Kettering, MD12,960476.0%
      Marlton, MD9,564476.0%
      Upper Marlboro, MD694476.0%
      National Harbor, MD4,279476.0%

      Cities with similar population

      CityPopulationAir Quality IndexNational Avg.
      Slatington, PA4,2784216.0%
      Sparta, MI4,2803824.0%
      Spackenkill, NY4,2803628.0%
      University Gardens, NY4,280512.0%
      Scottdale, PA4,2773628.0%
      National Harbor, MD4,279476.0%
      Source: The National Harbor, MD 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.