• Tonight

    Jul 29

    Lo 72°

    Partly cloudy and humid

    Travel Weather
    • Rain
      0 in
    • Wind
      Speed
      6 mph
    • T-storms
      24%
  • Sat

    Jul 30

    85°Lo 69°

    Heavy afternoon thunderstorms

    Very Good for travel
    • Rain
      0.64 in
    • Wind
      Speed
      6 mph
    • T-storms
      65%
    more
  • Sun

    Jul 31

    89°Lo 70°

    A couple of thunderstorms

    Excellent for travel
    • Rain
      0.40 in
    • Wind
      Speed
      4 mph
    • T-storms
      60%
    more
  • Mon

    Aug 1

    88°Lo 67°

    Periods of sun

    Excellent for travel
    • Rain
      0 in
    • Wind
      Speed
      6 mph
    • T-storms
      24%
    more
  • Tue

    Aug 2

    84°Lo 65°

    Periods of clouds and sun

    Excellent for travel
    • Rain
      0 in
    • Wind
      Speed
      7 mph
    • T-storms
      11%
    more
Next Previous
Hi 87° RealFeel® 96° Precipitation 25%

Day

N

E

S

W

  • NW 6 mph
  • Gusts: 13 mph

Humid with intervals of clouds and sunshine

  • Max UV Index: 7 (High)
  • Thunderstorms: 24%
  • Precipitation: 0 in
  • Rain: 0 in
  • Snow: 0 in
  • Ice: 0 in
  • Hours of Precipitation: 0 hrs
  • Hours of Rain: 0 hrs
Lo 72° RealFeel® 76° Precipitation 25%

Night

N

E

S

W

  • S 2 mph
  • Gusts: 5 mph

Partly cloudy and humid

  • Max UV Index: N/A
  • Thunderstorms: 24%
  • Precipitation: 0 in
  • Rain: 0 in
  • Snow: 0 in
  • Ice: 0 in
  • Hours of Precipitation: 0 hrs
  • Hours of Rain: 0 hrs

Temperature History - Jul 29

more Historical Weather Data >
  Today Normal Record 7/29/2015
High 87° 88° 103° (2011) 87°
Low 72° 66° 52° (2014) 70°

Sunrise/Sunset

Sunrise / Sunset Illustration

Rises at 6:08 AM with 14:15 of sunlight, then sets at 8:23 PM

Moonrise/Moonset

Astronomy >
Moonrise / Moonset Illustration

Rises at 2:10 AM with 14:26 of moolight, then sets at 4:36 PM

Herndon Weather Report

Soaking storms to elevate flash flood threat in northeastern US this weekend

July 29, 2016; 7:10 PM ET

Rounds of drenching showers and heavy thunderstorms will heighten the risk of flash flooding across the northeastern United States through the final weekend of July. more >

Travel Weather Forecast

Jul 29, 2016; 3:27 PM ET United States travel weather forecast

Weather Related Flight Delays

Fri. Travel Weather

Flight Tracker