Point Forecast: Herndon VA
 38.97N 77.38W (Elev. 354 ft)
Last Update: 4:30 am EDT Jul 15, 2025
Tabular Forecast
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Weather ElementsFire WeatherAviation Weather
Temperature (°F)
Dewpoint (°F)
Heat Index (°F)

Surface Wind  
Sky Cover (%)
Precipitation Potential (%)
Relative Humidity (%)

Rain
Thunder
Fog
Mixing Height  
Trans. Wind  
Vent Rate (x1000 mph-ft)
Atmospheric Dispersion Index
Low Visibility Occurrence Risk Index
Ceiling Height
Visibility

48-Hour Period Starting:       Back 2 Days  

Date07/1507/16
Hour (EDT)070809101112131415161718192021222300010203040506
Temperature (°F)737577798284868788878685848279787776767575747473
Dewpoint (°F)727475757576757575757575757576757575757475747473
Heat Index (°F)7577798993959698969594928979787776767575
Surface Wind (mph)222222333355553333333355
Wind DirNNNNNNNWNESESESESSSSSSSSSSSSS
Gust
Sky Cover (%)615055484433305056666959594940514947545137315856
Precipitation Potential (%)86244715253449543939171718164433569
Relative Humidity (%)9797948879777068666870727479919194979797100100100100
Rain------------SChcChcChcChcChcChcChcSChcSChcSChcSChc--------------
Thunder------------SChcChcChcChcChcChcChcSChcSChcSChc----------------

Date07/17
Hour (EDT)070809101112131415161718192021222300010203040506
Temperature (°F)747679828486878888878685838179787777777776757575
Dewpoint (°F)747576777777777777767676767676757575747474747475
Heat Index (°F)767990949799100100989694918779787777777776757575
Surface Wind (mph)666789999101010988777777666
Wind DirSSSWSWSSSSSSSSSSSSSSSSSSWSWSW
Gust
Sky Cover (%)525172666067738080808080807773696566666761544844
Precipitation Potential (%)1027272727272769696969696924242424242477777
Relative Humidity (%)10097918580757270707072758085919194949090949797100
Rain--ChcChcChcChcChcChcLklyLklyLklyLklyLklyLklySChcSChcSChcSChcSChcSChc----------
Thunder--------ChcChcChcLklyLklyLklyLklyLklyLklySChcSChcSChcSChcSChcSChc----------

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