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A May heat wave will complete the spring weather whiplash in the East. Click for details. Chevron right
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Herndon, VA

64°F
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Herndon

Virginia

64°
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Herndon, VA Weather
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May 17 - May 31

Sun 5/17

88° /62°
55%
Very warm with clouds and sun; a thunderstorm in spots this afternoon; possible danger of dehydration and heatstroke while doing strenuous activities

RealFeel®92°

RealFeel Shade™86°

Max UV Index9.0 (Very High)

WindWSW 6 mph

Hours of Precipitation0.5

Hours of Rain0.5

Mon 5/18

99° /68°
17%
Mostly sunny and very hot; danger of dehydration and heatstroke if outside for extended periods of time

RealFeel®102°

RealFeel Shade™97°

Max UV Index10.0 (Very High)

WindSSW 7 mph

Tue 5/19

98° /69°
5%
Mostly sunny with record-breaking temperatures; danger of dehydration and heatstroke if outside for extended periods of time

RealFeel®102°

RealFeel Shade™95°

Max UV Index10.0 (Very High)

WindSW 8 mph

Wed 5/20

89° /59°
55%
Partly sunny with the temperature near the record of 93 from 1996; an afternoon thunderstorm; thunderstorms can bring localized damaging wind gusts

RealFeel®96°

RealFeel Shade™87°

Max UV Index10.0 (Very High)

WindWSW 8 mph

Hours of Precipitation0.5

Hours of Rain0.5

Thu 5/21

66° /51°
88%
A couple of showers in the morning; otherwise, considerable cloudiness and cooler

RealFeel®65°

RealFeel Shade™63°

Max UV Index3.0 (Moderate)

WindNNE 8 mph

Hours of Precipitation2

Hours of Rain2

Fri 5/22

62° /52°
25%
Cloudy and cool

RealFeel®62°

RealFeel Shade™62°

Max UV Index3.0 (Moderate)

WindESE 8 mph

Sat 5/23

68° /56°
30%
Clouds and sun with a couple of showers possible

RealFeel®73°

RealFeel Shade™66°

Max UV Index5.0 (Moderate)

WindESE 5 mph

Sun 5/24

73° /61°
25%
Times of clouds and sun

RealFeel®73°

RealFeel Shade™71°

Max UV Index5.0 (Moderate)

WindESE 7 mph

Mon 5/25

74° /58°
30%
Periods of sun with a shower possible; humid

RealFeel®79°

RealFeel Shade™78°

Max UV Index5.0 (Moderate)

WindS 6 mph

Tue 5/26

77° /60°
60%
Periods of rain

RealFeel®79°

RealFeel Shade™76°

Max UV Index5.0 (Moderate)

WindSW 4 mph

Hours of Precipitation3.5

Hours of Rain3.5

Wed 5/27

79° /56°
56%
Mostly cloudy and humid; a shower in spots in the morning followed by a little rain in the afternoon

RealFeel®90°

RealFeel Shade™84°

Max UV Index10.0 (Very High)

WindSSW 2 mph

Hours of Precipitation2

Hours of Rain2

Thu 5/28

77° /56°
55%
Mostly cloudy and humid with a bit of rain

RealFeel®86°

RealFeel Shade™82°

Max UV Index4.0 (Moderate)

WindSSW 2 mph

Hours of Precipitation2

Hours of Rain2

Fri 5/29

81° /59°
1%
Humid with periods of clouds and sunshine

RealFeel®90°

RealFeel Shade™85°

Max UV Index11.0 (Extreme)

WindNW 8 mph

Sat 5/30

82° /57°
55%
Sun and some clouds with a thunderstorm in spots in the afternoon

RealFeel®90°

RealFeel Shade™81°

Max UV Index11.0 (Extreme)

WindWNW 4 mph

Hours of Precipitation0.5

Hours of Rain0.5

Sun 5/31

80° /61°
25%
Humid with intervals of clouds and sunshine

RealFeel®81°

RealFeel Shade™79°

Max UV Index4.0 (Moderate)

WindNW 8 mph

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World North America United States Virginia Herndon

Weather Near Herndon:

  • Alexandria, VA
  • Germantown, MD
  • Washington, DC
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