• Early AM

    Sep 1

    Lo 66°

    Clear

    Migraine Headache Weather
    • Hi
      RealFeel
      89°
    • UV
      5 - High
    • Cloud
      Cover
      21%
    more
  • Today

    Sep 1

    92°Lo 69°

    Mostly sunny, hot and humid

    Migraine Headache Weather
    • Hi
      RealFeel
      99°
    • UV
      5 - High
    • Cloud
      Cover
      39%
  • Wed

    Sep 2

    91°Lo 70°

    Partly sunny, hot and humid

    Migraine Headache Weather
    • Hi
      RealFeel
      102°
    • UV
      5 - High
    • Cloud
      Cover
      29%
    more
  • Thu

    Sep 3

    92°Lo 70°

    A p.m. t-storm in spots

    Migraine Headache Weather
    • Hi
      RealFeel
      97°
    • UV
      5 - High
    • Cloud
      Cover
      61%
    more
  • Fri

    Sep 4

    85°Lo 65°

    Humid with clouds and sun

    Migraine Headache Weather
    • Hi
      RealFeel
      91°
    • UV
      4 - Moderate
    • Cloud
      Cover
      91%
    more
Next Previous
< Previous 8 hours Next 8 hours >
  Tue
2am
3am 4am 5am 6am 7am 8am 9am
  2am 3am 4am 5am 6am 7am 8am 9am
Forecast
Mostly Clear
Clear
Clear
Clear
Clear
Sunny
Mostly Sunny
Mostly Sunny
Temp (°F) 71° 70° 70° 69° 66° 69° 72° 76°
RealFeel® 73° 71° 70° 70° 67° 70° 77° 84°
Humidity 89% 87% 86% 90% 99% 90% 89% 81%
   
  2am 3am 4am 5am 6am 7am 8am 9am
Rain
 
0%
 
0%
 
0%
 
0%
 
0%
 
0%
 
0%
 
0%
Snow
 
0%
 
0%
 
0%
 
0%
 
0%
 
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0%
Ice
 
0%
 
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  2am 3am 4am 5am 6am 7am 8am 9am
Wind (mph) 4 SSW 4 SSW 4 SW 2 SW 4 W 4 WNW 4 NW 4 NW
UV Index 0 0 0 0 0 0 1 2
Cloud Cover 10% 0% 0% 0% 3% 7% 10% 10%
Dew Point 68° 66° 65° 66° 66° 66° 69° 70°
Middle Grid line 80 F Middle Grid line 75 F Middle Grid line 70 F Middle Grid line 65 F

Temperature History - Sep 1

more Historical Weather Data >
  Today Normal Record 9/1/2014
High 92° 84° 98° (1980) 89°
Low 69° 62° 49° (1970) 71°

Sunrise/Sunset

Sunrise / Sunset Illustration

Rises at 6:38 AM with 13:02 of sunlight, then sets at 7:40 PM

Moonrise/Moonset

Astronomy >
Moonrise / Moonset Illustration

Rises at 9:39 PM with 13:27 of moolight, then sets at 11:06 AM

Herndon Weather Report

DC, Baltimore: Sizzling Heat Wave to Start September

September 1, 2015; 12:37 AM ET

July-like heat and humidity will continue for Washington, D.C., and Baltimore for the first week of September. more >

Tue. Migraine Headache

Tue. UV Index