• Today

    Apr 21

    67°Lo 44°

    Mostly sunny and not as warm

    Beneficial weather for migraines
    • Hi
      RealFeel
      66°
    • UV
      7 - High
    • Cloud
      Cover
      29%
  • Wed

    Apr 22

    66°Lo 35°

    Variable clouds, p.m. showers

    Beneficial weather for migraines
    • Hi
      RealFeel
      66°
    • UV
      5 - Moderate
    • Cloud
      Cover
      75%
    more
  • Thu

    Apr 23

    59°Lo 35°

    Mostly sunny and breezy

    Beneficial weather for migraines
    • Hi
      RealFeel
      59°
    • UV
      7 - High
    • Cloud
      Cover
      20%
    more
  • Fri

    Apr 24

    61°Lo 33°

    Mostly cloudy and breezy

    Beneficial weather for migraines
    • Hi
      RealFeel
      57°
    • UV
      7 - High
    • Cloud
      Cover
      39%
    more
  • Sat

    Apr 25

    57°Lo 36°

    Cloudy and cool

    Beneficial weather for migraines
    • Hi
      RealFeel
      58°
    • UV
      5 - Moderate
    • Cloud
      Cover
      95%
    more
Next Previous
< Previous 8 hours Next 8 hours >
  Tue
9am
10am 11am 12pm 1pm 2pm 3pm 4pm
  9am 10am 11am 12pm 1pm 2pm 3pm 4pm
Forecast
Partly Sunny
Partly Sunny
Mostly Sunny
Mostly Sunny
Mostly Sunny
Mostly Sunny
Mostly Sunny
Mostly Sunny
Temp (°F) 53° 56° 58° 60° 62° 63° 65° 66°
RealFeel® 49° 52° 56° 60° 63° 65° 66° 66°
Humidity 56% 47% 41% 37% 33% 30% 29% 28%
   
  9am 10am 11am 12pm 1pm 2pm 3pm 4pm
Rain
 
1%
 
1%
 
1%
 
1%
 
1%
 
0%
 
0%
 
0%
Snow
 
0%
 
0%
 
0%
 
0%
 
0%
 
0%
 
0%
 
0%
Ice
 
0%
 
0%
 
0%
 
0%
 
0%
 
0%
 
0%
 
0%
   
  9am 10am 11am 12pm 1pm 2pm 3pm 4pm
Wind (mph) 15 WNW 16 WNW 16 WNW 15 WNW 15 W 15 W 15 W 15 WSW
UV Index 2 4 5 6 7 6 5 4
Cloud Cover 42% 33% 29% 26% 22% 25% 25% 25%
Dew Point 38° 36° 34° 33° 32° 32° 32° 32°
Middle Grid line 70 F Middle Grid line 65 F Middle Grid line 60 F Middle Grid line 55 F Middle Grid line 50 F

Temperature History - Apr 21

more Historical Weather Data >
  Today Normal Record 4/21/2014
High 67° 69° 89° (1985) 70°
Low 44° 44° 29° (1983) 31°

Sunrise/Sunset

Sunrise / Sunset Illustration

Rises at 6:25 AM with 13:27 of sunlight, then sets at 7:52 PM

Moonrise/Moonset

Astronomy >
Moonrise / Moonset Illustration

Rises at 8:42 AM with 14:29 of moolight, then sets at 11:11 PM

Herndon Weather Report

DC, Baltimore: Cooler Air to Sweep Away Warmth This Week

April 21, 2015; 5:41 AM ET

Cooler air will push into the Washington, D.C., and Baltimore areas during the middle and latter part of the week. more >

Tue. Migraine Headache

Tue. UV Index