Best year time to visit National Harbor

General weather information about National Harbor

Average annual temperature is 14.9 °C

Absolute maximum temperature: 37.8 °C

Absolute minimum temperature: -8.5 °C

Number of sunny days: 185 days

Number of rainy days: 178 days

Number of snow days: 2 days

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* Weather data for National Harbor United States is based on climate observations for 2026 year

National Harbor air temperature forecast for each month

JanFebMarAprMayJunJulAugSepOctNovDec
Absolute maximum temperature (°C)18.723.924.531.728.333.237.833.736.728.326.316.8
Average daytime temperature (°C)10.512.413.522.122.627.831.730.326.821.614.011.1
Average temperature (°C)6.27.17.915.616.921.825.924.721.515.88.36.4
Average night temperature (°C)2.82.83.110.311.716.621.220.317.211.13.92.7
Absolute minimum temperature (°C)-3.0-8.5-3.92.26.412.618.416.311.14.9-5.1-3.1

National Harbor monthly weather indicators

JanFebMarAprMayJunJulAugSepOctNovDec
Daylight maximum duration (h)10.011.012.013.014.014.014.014.013.011.010.09.0
Daylight mean duration (h)9.810.812.013.214.314.814.613.612.411.210.19.5
Daylight minimum duration (h)9.010.011.012.013.014.014.013.011.010.09.09.0
Sunshine mean duration (h)5.36.57.79.210.811.112.010.68.48.87.65.4
Precipitation (mm)7867601445810596631054661173
Sunny days15161717161181316192116
Rainy days16121413151923181412814
Snow days000000000011

National Harbor - weather forecast by months

National Harbor weather in januaryNational Harbor weather in februaryNational Harbor weather in marchNational Harbor weather in aprilNational Harbor weather in mayNational Harbor weather in juneNational Harbor weather in julyNational Harbor weather in augustNational Harbor weather in septemberNational Harbor weather in octoberNational Harbor weather in novemberNational Harbor weather in december

Best time to visit National Harbor:

The best time to visit National Harbor during the most sunny months:

  • May — 10.8(h)
  • June — 11.1(h)
  • July — 12.0(h)

The largest precipitation sum in National Harbor is at

  • April — 144(mm)
  • December — 173(mm)

    • Weather forecast in the closest to National Harbor admin centers

    Weather forecast in the closest towns to National Harbor

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    MapTrains schedule
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    Frequently asked questions

    When is the best time to visit National Harbor?
    The historical weather data above shows the warmest, sunniest and driest months to help you choose the best time to visit National Harbor.
    What is the weather like in National Harbor?
    See average temperature, rainfall and daylight hours for National Harbor by month in the table above.
    How many sunny days does National Harbor have?
    The monthly weather statistics above show sunshine and rainfall patterns for National Harbor throughout the year.