


Hazardous Weather Conditions
Current conditions at
Washington/Dulles International Airport, DC (KIAD)
Lat: 38.93°NLon: 77.45°WElev: 312ft.
Mostly Cloudy
85°F
29°C
Humidity | 63% |
Wind Speed | NE 7 mph |
Barometer | 30.08 in (1018.3 mb) |
Dewpoint | 71°F (22°C) |
Visibility | 10.00 mi |
Heat Index | 90°F (32°C) |
Last update | 15 Jul 1:52 pm EDT |
Extended Forecast for
Herndon VA
This Afternoon
High: 90 °F
Chance
T-stormsTonight
Low: 73 °F
Chance
T-storms then
Mostly CloudyWednesday
High: 90 °F
Partly Sunny
then T-storms
LikelyWednesday Night
Low: 74 °F
T-storms
Likely then
Slight Chance
T-stormsThursday
High: 95 °F
Mostly Sunny
then Chance
T-stormsThursday Night
Low: 75 °F
Chance
T-storms then
Partly CloudyFriday
High: 88 °F
Partly Sunny
then Showers
LikelyFriday Night
Low: 71 °F
Showers
Likely then
Partly CloudySaturday
High: 86 °F
Partly Sunny
then Chance
T-storms
Detailed Forecast
This Afternoon
A chance of showers and thunderstorms. Partly sunny, with a high near 90. Heat index values as high as 101. Light and variable wind. Chance of precipitation is 40%.
Tonight
A chance of showers and thunderstorms, mainly before 7pm. Partly cloudy, with a low around 73. Southeast wind around 5 mph becoming calm in the evening. Chance of precipitation is 30%.
Wednesday
Showers and thunderstorms likely, mainly after 4pm. Partly sunny, with a high near 90. Heat index values as high as 100. South wind 5 to 9 mph. Chance of precipitation is 60%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Wednesday Night
Showers and thunderstorms likely, mainly before 8pm. Mostly cloudy, with a low around 74. Southwest wind around 7 mph. Chance of precipitation is 60%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Thursday
A chance of showers and thunderstorms after 2pm. Mostly sunny, with a high near 95. West wind around 8 mph. Chance of precipitation is 40%.
Thursday Night
A chance of showers and thunderstorms before 8pm. Partly cloudy, with a low around 75. Chance of precipitation is 30%.
Friday
Showers likely and possibly a thunderstorm after 2pm. Partly sunny, with a high near 88. Chance of precipitation is 60%.
Friday Night
Showers likely and possibly a thunderstorm before 8pm. Mostly cloudy, with a low around 71. Chance of precipitation is 60%.
Saturday
A chance of showers and thunderstorms after 2pm. Partly sunny, with a high near 86. Chance of precipitation is 40%.
Saturday Night
A chance of showers and thunderstorms before 2am. Mostly cloudy, with a low around 72. Chance of precipitation is 30%.
Sunday
Showers likely and possibly a thunderstorm. Partly sunny, with a high near 89. Chance of precipitation is 70%.
Sunday Night
Showers and thunderstorms likely. Mostly cloudy, with a low around 71. Chance of precipitation is 60%.
Monday
A chance of showers and thunderstorms. Partly sunny, with a high near 86. Chance of precipitation is 50%.
Additional Forecasts and Information
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ABOUT THIS FORECAST
Point Forecast:
Herndon VA
38.97°N 77.38°W (Elev. 354 ft)
38.97°N 77.38°W (Elev. 354 ft)
1:31 pm EDT Jul 15, 2025
2pm EDT Jul 15, 2025-6pm EDT Jul 21, 2025