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    • Today

      Sep 26

      69° /60°
      Mostly cloudy
      • Ragweed Pollen
        • Ragweed Pollen
        • Grass Pollen
        • Tree Pollen
        • Mold
        • Dust & Dander
        • Air Quality Index
      • Moderate
      • ragweed pollen levels
      • Grass Pollen: Low
      • Ragweed Pollen: Moderate
      • Tree Pollen: Low
      More
    • Tue

      Sep 27

      74° /55°F
      Clouds giving way to sun
      • Low
      • ragweed pollen levels
      • Grass Pollen: Low
      • Ragweed Pollen: Low
      • Tree Pollen: Low
    • Wed

      Sep 28

      73° /60°
      A bit of afternoon rain
      • Moderate
      • ragweed pollen levels
      • Grass Pollen: Low
      • Ragweed Pollen: Moderate
      • Tree Pollen: Low
      More
    • Thu

      Sep 29

      72° /60°
      Rather cloudy, showers around
      • Moderate
      • ragweed pollen levels
      • Grass Pollen: Low
      • Ragweed Pollen: Moderate
      • Tree Pollen: Low
      More
    • Fri

      Sep 30

      73° /54°
      Downpours in the morning
      • Low
      • ragweed pollen levels
      • Grass Pollen: Low
      • Ragweed Pollen: Low
      • Tree Pollen: Low
      More

    Day

    74°Hi RealFeel® 79° Precipitation 25%
    Clouds giving way to sun
    • WSW 5 mph
    • Gusts: 8 mph
    • Max UV Index: 5 (Moderate)
    • Thunderstorms: 3%
    • Precipitation: 0 in
    • Rain: 0 in
    • Snow: 0 in
    • Ice: 0 in
    • Hours of Precipitation: 0 hrs
    • Hours of Rain: 0 hrs

    Night

    55°Lo RealFeel® 56° Precipitation 24%
    Partly cloudy
    • NW 2 mph
    • Gusts: 6 mph
    • Max UV Index: N/A
    • Thunderstorms: 0%
    • Precipitation: 0 in
    • Rain: 0 in
    • Snow: 0 in
    • Ice: 0 in
    • Hours of Precipitation: 0 hrs
    • Hours of Rain: 0 hrs

    Herndon Pollen Levels Sep 27

    • Extreme
    • Very High
    • High
    • Moderate
    • Low
    • Tree Pollen

      Low

    • Ragweed Pollen

      Low

    • Mold

      High

    • Grass Pollen

      Low

    Temperature History

    more Historical Weather Data >
      Today Normal Record 9/27/2015
    High 74° 75° 96° (1998) 72°
    Low 55° 51° 35° (1984) 59°

    Sunrise/Sunset

    • Sunrise: 7:02 AM
    • Sunset: 6:57 PM
    • Duration: 11:55 hr

    Moonrise/Moonset

    • Moonrise: 3:41 AM
    • Moonset: 5:21 PM
    • Duration: 13:40 hr
    Astronomy

    Herndon Weather Report

    Rounds of rain to frequent northeastern US this week

    September 26, 2016; 5:02 PM ET

    Bouts of wet weather will soak the northeastern United States during the last full week of September. More >

    Tue. Pollen

    Tue. Dust & Dander

    Tue. Wind Maps