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    • Tonight

      Feb 20

      58° Lo F
      Partly cloudy, mild; fog late
      • Ragweed Pollen
        • Ragweed Pollen
        • Grass Pollen
        • Tree Pollen
        • Mold
        • Dust & Dander
        • Air Quality Index
      • Ragweed Pollen
      • Weather
      • Grass Pollen: Low
      • Ragweed Pollen: Low
      • Tree Pollen: Moderate
    • Wed

      Feb 21

      75° /48°
      Times of clouds and sun
      • Low
      • ragweed pollen levels
      • Grass Pollen: Low
      • Ragweed Pollen: Low
      • Tree Pollen: Low
      More
    • Thu

      Feb 22

      52° /39°
      Cooler with a touch of rain
      • Low
      • ragweed pollen levels
      • Grass Pollen: Low
      • Ragweed Pollen: Low
      • Tree Pollen: Low
      More
    • Fri

      Feb 23

      48° /46°
      Cloudy with a brief shower
      • Low
      • ragweed pollen levels
      • Grass Pollen: Low
      • Ragweed Pollen: Low
      • Tree Pollen: Low
      More
    • Sat

      Feb 24

      62° /53°
      Cloudy with a little rain
      • Low
      • ragweed pollen levels
      • Grass Pollen: Low
      • Ragweed Pollen: Low
      • Tree Pollen: Low
      More

    Day

    78°Hi RealFeel® 76° Precipitation 1%
    Mostly sunny
    • Winds from the
    • SSW 10 mph
    • Gusts: 26 mph
    • Max UV Index: 4 (Moderate)
    • Thunderstorms: 0%
    • Precipitation: 0 in
    • Rain: 0 in
    • Snow: 0 in
    • Ice: 0 in
    • Hours of Precipitation: 0 hrs
    • Hours of Rain: 0 hrs

    Night

    58°Lo RealFeel® 55° Precipitation 6%
    Mild with patchy clouds; patchy fog late
    • Winds from the
    • SSW 8 mph
    • Gusts: 16 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 Feb 20

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

      Moderate

    • Ragweed Pollen

      Low

    • Mold

      Low

    • Grass Pollen

      Low

    Temperature History

    more Historical Weather Data >
      Today Normal Record 2/20/2017
    High 78° 48° 70° (1971) 65°
    Low 58° 27° -2° (1979) 40°

    Sunrise/Sunset

    • Sunrise: 6:55 AM
    • Sunset: 5:52 PM
    • Duration: 10:57 hr

    Moonrise/Moonset

    • Moonrise: 9:39 AM
    • Moonset: 10:49 PM
    • Duration: 13:10 hr
    Astronomy

    Tue. Pollen

    Tue. Dust & Dander

    Tue. Wind Maps