• Early AM

    May 31

    Lo 65°

    Partly cloudy

    Asthma Weather
    • Hi
      RealFeel
      90°
    • UV
      5 - High
    • Air Qual.
      N/A
    more
  • Today

    May 31

    85°Lo 64°

    Some sunshine

    Neutral weather for asthma
    • Hi
      RealFeel
      91°
    • UV
      5 - High
    • Air Qual.
      N/A
    more
  • Wed

    Jun 1

    80°Lo 61°

    A thunderstorm in spots

    Neutral weather for asthma
    • Hi
      RealFeel
      84°
    • UV
      5 - High
    • Air Qual.
      N/A
    more
  • Thu

    Jun 2

    75°Lo 65°

    A t-storm in the afternoon

    Neutral weather for asthma
    • Hi
      RealFeel
      79°
    • UV
      4 - Moderate
    • Air Qual.
      N/A
  • Fri

    Jun 3

    78°Lo 62°

    Partly sunny with a t-storm

    Neutral weather for asthma
    • Hi
      RealFeel
      85°
    • UV
      4 - Moderate
    • Air Qual.
      N/A
    more
Next Previous
Hi 75° RealFeel® 79° Precipitation 55%

Day

N

E

S

W

  • ESE 6 mph
  • Gusts: 9 mph

Variable cloudiness with a shower or thunderstorm around in the afternoon

  • Max UV Index: 5 (Moderate)
  • Thunderstorms: 40%
  • Precipitation: 0.05 in
  • Rain: 0.05 in
  • Snow: 0 in
  • Ice: 0 in
  • Hours of Precipitation: 0.5 hrs
  • Hours of Rain: 0.5 hrs
Lo 65° RealFeel® 63° Precipitation 43%

Night

N

E

S

W

  • SE 5 mph
  • Gusts: 7 mph

Cloudy with a shower in spots late

  • Max UV Index: N/A
  • Thunderstorms: 40%
  • Precipitation: 0.02 in
  • Rain: 0.02 in
  • Snow: 0 in
  • Ice: 0 in
  • Hours of Precipitation: 0.5 hrs
  • Hours of Rain: 0.5 hrs

Temperature History - Jun 2

more Historical Weather Data >
  Today Normal Record 6/2/2015
High 75° 80° 91° (2009) 70°
Low 65° 57° 41° (1993) 57°

Sunrise/Sunset

Sunrise / Sunset Illustration

Rises at 5:45 AM with 14:45 of sunlight, then sets at 8:30 PM

Moonrise/Moonset

Astronomy >
Moonrise / Moonset Illustration

Rises at 4:04 AM with 13:38 of moolight, then sets at 5:42 PM

Herndon Weather Report

Bout of cooler air to interrupt summerlike warmth across northeastern US

May 31, 2016; 12:41 AM ET

Temperatures and humidity levels will throttle back as dry air expands southward in the northeastern United States through the middle of the week. more >

Thu. Asthma Risk

Thu. UV Index