• Tonight

    Aug 20

    Lo 65°

    An evening shower or t-storm

    Home Energy Efficiency Weather
    • Avg
      RealFeel
      77°
    • Hi
      RealFeel
      90°
    • Wind
      Speed
      6 mph
    more
  • Thu

    Aug 21

    88°Lo 67°

    Couple of showers, t-storms

    Poor for home energy
    • Avg
      RealFeel
      81°
    • Hi
      RealFeel
      95°
    • Wind
      Speed
      3 mph
  • Fri

    Aug 22

    84°Lo 68°

    A couple of thunderstorms

    Poor for home energy
    • Avg
      RealFeel
      80°
    • Hi
      RealFeel
      93°
    • Wind
      Speed
      3 mph
    more
  • Sat

    Aug 23

    78°Lo 66°

    A shower or two; not as warm

    Poor for home energy
    • Avg
      RealFeel
      73°
    • Hi
      RealFeel
      83°
    • Wind
      Speed
      5 mph
    more
  • Sun

    Aug 24

    78°Lo 62°

    Times of clouds and sun

    Poor for home energy
    • Avg
      RealFeel
      70°
    • Hi
      RealFeel
      80°
    • Wind
      Speed
      5 mph
    more
Next Previous
Hi 88° RealFeel® 95° Precipitation 64%

Day

N

E

S

W

  • WNW 3 mph
  • Gusts: 7 mph

Clouds and breaks of sun; humid with a couple of showers and a thunderstorm, mainly later

  • Max UV Index: 6 (High)
  • Thunderstorms: 60%
  • Precipitation: 0.23 in
  • Rain: 0.23 in
  • Snow: 0 in
  • Ice: 0 in
  • Hours of Precipitation: 2 hrs
  • Hours of Rain: 2 hrs
Lo 67° RealFeel® 67° Precipitation 60%

Night

N

E

S

W

  • N 2 mph
  • Gusts: 4 mph

Partly cloudy with a couple of showers, mainly early

  • Max UV Index: N/A
  • Thunderstorms: 29%
  • Precipitation: 0.05 in
  • Rain: 0.05 in
  • Snow: 0 in
  • Ice: 0 in
  • Hours of Precipitation: 1.5 hrs
  • Hours of Rain: 1.5 hrs

Temperature History - Aug 21

more Historical Weather Data >
  Today Normal Record 8/21/2013
High 88° 86° 100° (1874) 89°
Low 67° 69° 53° (1908) 73°

Sunrise/Sunset

Sunrise / Sunset Illustration

Rises at 6:27 AM with 13:29 of sunlight, then sets at 7:56 PM

Moonrise/Moonset

Astronomy >
Moonrise / Moonset Illustration

Rises at 2:57 AM with 14:25 of moolight, then sets at 5:22 PM

Top Story

Rockville Weather Report

DC: Downpour, Flooding Risk to Increase

August 20, 2014; 12:00 PM ET

A wedge of dry air will slowly erode at midweek and will allow drenching showers and thunderstorms to survive the trip into Washington, D.C., from the Midwest. more >

Energy Efficient Lightbulbs and S.A.D

Sep 8, 2012; 5:00 AM ET With shorter days and colder nights in the fall and winter, some people develop seasonal affective disorder. When shopping for lightbulbs to treat the 'winter blues,'consider energy-efficient bulbs.

Thu. Home Energy Efficiency

Thu. Degree Days

Thu. UV Index