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    • Tonight

      Sep 28

      66° Lo F
      Heavy rain and a thunderstorm
      • 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: Low
    • Thu

      Sep 29

      70° /63°
      Heavy rain and a thunderstorm
      • Moderate
      • ragweed pollen levels
      • Grass Pollen: Low
      • Ragweed Pollen: Moderate
      • Tree Pollen: Low
      More
    • Fri

      Sep 30

      68° /64°
      Cloudy with showers around
      • Low
      • ragweed pollen levels
      • Grass Pollen: Low
      • Ragweed Pollen: Low
      • Tree Pollen: Low
      More
    • Sat

      Oct 1

      75° /61°
      Warmer with a passing shower
      • Low
      • ragweed pollen levels
      • Grass Pollen: Low
      • Ragweed Pollen: Low
      • Tree Pollen: Low
      More
    • Sun

      Oct 2

      78° /57°
      A couple of afternoon showers
      • Low
      • ragweed pollen levels
      • Grass Pollen: Low
      • Ragweed Pollen: Low
      • Tree Pollen: Low
      More
    67°/66° RealFeel® 66°/60°
    Periods of rain, some heavy, and a thunderstorm
    • 7 mph
    • Precipitation: 75%
    • Rain: 1.24 in
    • Snow: 0 in
    • Humidity: 93%
    • Cloud Cover: 99%
    • Dew Point: 65° F
    • Visibility: 5 mi

    Temperature History

    more Historical Weather Data >
      Today Normal Record 9/28/2015
    High 68° 71° N/A 81°
    Low 66° 55° N/A 63°

    Sunrise/Sunset

    • Sunrise: 7:02 AM
    • Sunset: 6:55 PM
    • Duration: 11:53 hr

    Moonrise/Moonset

    • Moonrise: 4:39 AM
    • Moonset: 5:54 PM
    • Duration: 13:15 hr
    Astronomy

    Rockville Weather Report

    Persistent rain to raise flood risk in part of northeastern US late this week

    September 28, 2016; 9:55 PM ET

    Rain will spread over much of the northeastern U.S. into the weekend, but persistent downpours will raise the flood risk in part of the mid-Atlantic. More >

    Wed. Pollen

    Wed. Dust & Dander

    Wed. Wind Maps