Herndon Weather Forecast

    • 31
    • 58

    Rain Showers

    • 36
    • 50

    Partly Sunny

    • 46
    • 60

    Mostly Cloudy

    • 52
    • 71

    Chance Rain

    • 31
    • 62

    Chance Rain/Snow

    • 31
    • 49

    Mostly Sunny

Today 23 Mar Eastern Loudoun

Mostly cloudy with Showers in the Morning, then mostly sunny in the afternoon. Much cooler with Highs in the upper 50s. North Winds 15 to 20 Mph. Gusts up to 35 Mph in the afternoon. Chance of rain 70 percent.

Tonight 23 Mar Eastern Loudoun

Mostly clear in the Evening, then becoming partly cloudy. Cooler with Lows in the lower 30s. Northwest Winds 15 to 20 Mph with Gusts up to 30 Mph.

Graph Plots Open in Graphs

  • Temperature Forecast NOAA

  • Temperature Real-Time

Herndon Temperature Statistics

March Temperature

Washington/Dulles International Airport, DC (4.3 miles)

  • Lowest 18 March, 2026

    23.6 °F

  • Average March

    49.6 °F

  • Highest 11 March, 2026

    86.6 °F

Climate (2021–Present)

Washington/Dulles International Airport, DC (4.3 miles)

Take a look at our website widgetsAvailable free! Find Out More

  • Average Low 2021–2026

    47.5 °F

  • Average 2021–2026

    58.1 °F

  • Average High 2021–2026

    68.4 °F
Get WillyWeather+ to remove ads