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    • Tonight

      Sep 28

      66° Lo
      Heavy rain and a thunderstorm
      • Asthma
      • Weather
      • Hi RealFeel: 68°
      • UV: 2 - Low
      • Air Qual.: Good
      More
    • Thu

      Sep 29

      70° /63°F
      Heavy rain and a thunderstorm
      • At High Risk
      • weather for asthma
      • Hi RealFeel: 70°
      • UV: 2 - Low
      • Air Qual.: Good
    • Fri

      Sep 30

      68° /64°
      Cloudy with showers around
      • Neutral
      • weather for asthma
      • Hi RealFeel: 64°
      • UV: 2 - Low
      • Air Qual.: Good
      More
    • Sat

      Oct 1

      75° /61°
      Warmer with a passing shower
      • Neutral
      • weather for asthma
      • Hi RealFeel: 78°
      • UV: 2 - Low
      • Air Qual.: Good
      More
    • Sun

      Oct 2

      78° /57°
      A couple of afternoon showers
      • Beneficial
      • weather for asthma
      • Hi RealFeel: 86°
      • UV: 4 - Moderate
      • Air Qual.: Good
      More

    Day

    70°Hi RealFeel® 70° Precipitation 76%
    Heavy rain and a t-storm; windy and humid; watch for flooding on streets and poor drainage areas
    • E 17 mph
    • Gusts: 31 mph
    • Max UV Index: 1 (Low)
    • Thunderstorms: 44%
    • Precipitation: 1.17 in
    • Rain: 1.17 in
    • Snow: 0 in
    • Ice: 0 in
    • Hours of Precipitation: 7 hrs
    • Hours of Rain: 7 hrs

    Night

    63°Lo RealFeel® 58° Precipitation 64%
    Overcast, breezy and humid with a touch of rain
    • ENE 15 mph
    • Gusts: 24 mph
    • Max UV Index: N/A
    • Thunderstorms: 13%
    • Precipitation: 0.19 in
    • Rain: 0.19 in
    • Snow: 0 in
    • Ice: 0 in
    • Hours of Precipitation: 3 hrs
    • Hours of Rain: 3 hrs

    Temperature History

    more Historical Weather Data >
      Today Normal Record 9/29/2015
    High 70° 70° N/A 79°
    Low 63° 54° N/A 68°

    Sunrise/Sunset

    • Sunrise: 7:03 AM
    • Sunset: 6:53 PM
    • Duration: 11:50 hr

    Moonrise/Moonset

    • Moonrise: 5:38 AM
    • Moonset: 6:25 PM
    • Duration: 12:47 hr
    Astronomy

    Rockville Weather Report

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

    September 28, 2016; 6:05 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 >

    Thu. Air Quality

    Thu. Asthma Risk

    Thu. UV Index