• Today

    Sep 3

    92°Lo 71°

    Turning cloudy, hot and humid

    Good for lawn mowing
    • Hours of Precip
      0.5
    • Precip
      16%
    • Hi
      RealFeel
      101°
  • Fri

    Sep 4

    89°Lo 69°

    A t-storm around in the p.m.

    Good for lawn mowing
    • Hours of Precip
      1
    • Precip
      40%
    • Hi
      RealFeel
      99°
    more
  • Sat

    Sep 5

    82°Lo 63°

    Some clouds, then sunshine

    Very Good for lawn mowing
    • Hours of Precip
      0
    • Precip
      25%
    • Hi
      RealFeel
      85°
    more
  • Sun

    Sep 6

    83°Lo 65°

    Humid with plenty of sunshine

    Very Good for lawn mowing
    • Hours of Precip
      0
    • Precip
      17%
    • Hi
      RealFeel
      88°
    more
  • Mon

    Sep 7

    86°Lo 67°

    Partly sunny and warm

    Excellent for lawn mowing
    • Hours of Precip
      0
    • Precip
      14%
    • Hi
      RealFeel
      88°
    more
Next Previous
< Previous 8 hours Next 8 hours >
  Thu
5pm
6pm 7pm 8pm 9pm 10pm 11pm Fri
12am
  5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
Forecast
Partly Cloudy
Partly Cloudy
Mostly Cloudy
Partly Cloudy
T-storms
Partly Cloudy
Partly Cloudy
Partly Cloudy
Temp (°F) 89° 87° 84° 82° 78° 77° 77° 75°
RealFeel® 92° 89° 87° 84° 77° 80° 80° 78°
Humidity 48% 52% 60% 64% 72% 79% 80% 82%
   
  5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
Rain
 
2%
 
2%
 
5%
 
47%
 
51%
 
47%
 
14%
 
14%
Snow
 
0%
 
0%
 
0%
 
0%
 
0%
 
0%
 
0%
 
0%
Ice
 
0%
 
0%
 
0%
 
0%
 
0%
 
0%
 
0%
 
0%
   
  5pm 6pm 7pm 8pm 9pm 10pm 11pm 12am
Wind (mph) 6 NNW 6 NNW 6 NNW 5 NNW 5 NNW 5 NNW 5 NNW 5 NNW
UV Index 2 1 0 0 0 0 0 0
Cloud Cover 59% 72% 84% 45% 45% 45% 45% 45%
Dew Point 67° 67° 69° 69° 69° 70° 70° 70°
Middle Grid line 90 F Middle Grid line 85 F Middle Grid line 80 F Middle Grid line 75 F Middle Grid line 70 F

Temperature History - Sep 3

more Historical Weather Data >
  Today Normal Record 9/3/2014
High 92° 84° 96° (1993) 85°
Low 71° 61° 45° (1967) 69°

Sunrise/Sunset

Sunrise / Sunset Illustration

Rises at 6:40 AM with 12:57 of sunlight, then sets at 7:37 PM

Moonrise/Moonset

Astronomy >
Moonrise / Moonset Illustration

Rises at 11:04 PM with 14:14 of moolight, then sets at 1:18 PM

Herndon Weather Report

DC, Baltimore: Heat to Rebuild Labor Day Weekend After Cooldown

September 3, 2015; 4:55 PM ET

A backdoor front will trim temperatures, haze and humidity around the Washington, D.C., and Baltimore areas early this weekend before all three conditions build by early next week. more >

Why Do Leaves Change Color?

Sep 20, 2011; 5:00 AM ET Why do leaves change from green to beautiful shades of red, orange and yellow in the fall?

Current Drought Status

Current Soil Conditions

Thu. Overnight Freeze

Thu. Degree Days

Thu. Evapotranspiration