• Early AM

    Aug 21

    Lo 65°

    Partly to mostly cloudy

    Ragweed Pollen Weather
    • Grass
      Pollen
      2 - Low
    • Ragweed
      Pollen
      5 - Low
    • Tree
      Pollen
      0 - Low
    more
  • Today

    Aug 21

    90°Lo 67°

    Showers and thunderstorms

    Low ragweed pollen levels
    • Grass
      Pollen
      2 - Low
    • Ragweed
      Pollen
      5 - Low
    • Tree
      Pollen
      0 - Low
  • Fri

    Aug 22

    84°Lo 68°

    Couple of thunderstorms

    Low ragweed pollen levels
    • Grass
      Pollen
      2 - Low
    • Ragweed
      Pollen
      5 - Low
    • Tree
      Pollen
      0 - Low
    more
  • Sat

    Aug 23

    78°Lo 65°

    Not as warm with a shower

    Low ragweed pollen levels
    • Precip
      54%
    • Wind
      Speed
      6 mph
    • Cloud
      Cover
      70%
    more
  • Sun

    Aug 24

    78°Lo 62°

    Times of clouds and sun

    Ragweed Pollen Weather
    • Precip
      25%
    • Wind
      Speed
      6 mph
    • Cloud
      Cover
      69%
    more
Next Previous
< Previous 8 hours Next 8 hours >
  Thu
1am
2am 3am 4am 5am 6am 7am 8am
  1am 2am 3am 4am 5am 6am 7am 8am
Forecast
Partly Cloudy
Partly Cloudy
Cloudy
Cloudy
Mostly Cloudy
Mostly Cloudy
Mostly Cloudy
Partly Cloudy
Temp (°F) 68° 67° 67° 66° 66° 65° 67° 70°
RealFeel® 68° 67° 66° 65° 64° 63° 66° 72°
Humidity 99% 99% 97% 95% 95% 93% 96% 90%
   
  1am 2am 3am 4am 5am 6am 7am 8am
Rain
 
29%
 
20%
 
20%
 
20%
 
20%
 
20%
 
13%
 
15%
Snow
 
0%
 
0%
 
0%
 
0%
 
0%
 
0%
 
0%
 
0%
Ice
 
0%
 
0%
 
0%
 
0%
 
0%
 
0%
 
0%
 
0%
   
  1am 2am 3am 4am 5am 6am 7am 8am
Wind (mph) 3 ENE 3 ENE 3 ENE 3 E 2 ESE 2 SSE 2 S 2 SSW
UV Index 0 0 0 0 0 0 0 1
Cloud Cover 41% 41% 53% 71% 85% 86% 79% 70%
Dew Point 67° 67° 66° 65° 64° 63° 66° 67°
Middle Grid line 75 F Middle Grid line 70 F Middle Grid line 65 F Middle Grid line 60 F

Temperature History - Aug 21

more Historical Weather Data >
  Today Normal Record 8/21/2013
High 90° 86° 94° (2009) 89°
Low 67° 64° 47° (1976) 66°

Sunrise/Sunset

Sunrise / Sunset Illustration

Rises at 6:28 AM with 13:29 of sunlight, then sets at 7:57 PM

Moonrise/Moonset

Astronomy >
Moonrise / Moonset Illustration

Rises at 2:58 AM with 14:25 of moolight, then sets at 5:23 PM

Top Story

Herndon 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 >

Thu. Pollen

Thu. Dust & Dander

Thu. Wind Maps