• Today

    Apr 21

    65°Lo 44°

    Sunshine; breezy, not as warm

    Good for an outdoor bbq
    • Precip
      9%
    • Hi
      RealFeel
      66°
    • Wind
      Gust
      28 mph
  • Wed

    Apr 22

    65°Lo 34°

    A couple of p.m. t-storms

    Good for an outdoor bbq
    • Precip
      61%
    • Hi
      RealFeel
      66°
    • Wind
      Gust
      30 mph
    more
  • Thu

    Apr 23

    58°Lo 33°

    Mostly sunny and windy

    Poor for an outdoor bbq
    • Precip
      17%
    • Hi
      RealFeel
      55°
    • Wind
      Gust
      31 mph
    more
  • Fri

    Apr 24

    60°Lo 32°

    Breezy with clouds and sun

    Fair for an outdoor bbq
    • Precip
      9%
    • Hi
      RealFeel
      59°
    • Wind
      Gust
      27 mph
    more
  • Sat

    Apr 25

    61°Lo 38°

    Rain and drizzle possible

    Fair for an outdoor bbq
    • Precip
      30%
    • Hi
      RealFeel
      64°
    • Wind
      Gust
      14 mph
    more
Next Previous
Hi 65° RealFeel® 66° Precipitation 9%

Day

N

E

S

W

  • W 14 mph
  • Gusts: 28 mph

Mostly sunny, breezy and not as warm

  • Max UV Index: 7 (High)
  • Thunderstorms: 2%
  • Precipitation: 0 in
  • Rain: 0 in
  • Snow: 0 in
  • Ice: 0 in
  • Hours of Precipitation: 0 hrs
  • Hours of Rain: 0 hrs
Lo 44° RealFeel® 41° Precipitation 12%

Night

N

E

S

W

  • S 7 mph
  • Gusts: 13 mph

Patchy clouds

  • Max UV Index: N/A
  • Thunderstorms: 2%
  • Precipitation: 0 in
  • Rain: 0 in
  • Snow: 0 in
  • Ice: 0 in
  • Hours of Precipitation: 0 hrs
  • Hours of Rain: 0 hrs

Temperature History - Apr 21

more Historical Weather Data >
  Today Normal Record 4/21/2014
High 65° 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; 10:41 AM ET

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

Is Your Outdoor Gear Waterproof?

Dec 5, 2012; 5:00 AM ET Now that it's cold enough to hit the slopes, you may want to look more closely at what materials your winter sports gear is made of. As it turns out, not all waterproofing is created equal.

Tue. Outdoor Entertaining

Tue. Wind Maps

Tue. UV Index