National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Dangerous Heat and Possible Flooding

Dangerous heat will persist across the Southwest U.S. through Saturday with daytime highs of 110-115°F. Extreme Heat Warnings remain in effect. Dangerous heat will build across the southern Plains again beginning this weekend. Heavy to excessive rain over the Carolinas Friday may lead to isolated areas of flash flooding. Read More >

Hazardous Weather Conditions

Current conditions at

Washington Manassas Airport (KHEF)

Lat: 38.72°NLon: 77.52°WElev: 194ft.

A Few Clouds

87°F

31°C

Humidity 57%
Wind Speed Vrbl 7 mph
Barometer 30.05 in (1017.9 mb)
Dewpoint 70°F (21°C)
Visibility 10.00 mi
Heat Index92°F (33°C)
Last update 28 Aug 11:56 am EDT
Extended Forecast for

Loch Lomond VA

  • This Afternoon

    This Afternoon: A slight chance of showers, with thunderstorms also possible after 2pm. Partly sunny, with a high near 87. North wind around 5 mph. Chance of precipitation is 20%.

    High: 87 °F

    Slight Chance
    T-storms

  • Tonight

    Tonight: Partly cloudy, with a low around 65. North wind 3 to 6 mph.

    Low: 65 °F

    Partly Cloudy

  • Saturday

    Saturday: Mostly sunny, with a high near 85. North wind 5 to 8 mph.

    High: 85 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 65. East wind around 6 mph becoming calm in the evening.

    Low: 65 °F

    Partly Cloudy

  • Sunday

    Sunday: Mostly sunny, with a high near 89. South wind 5 to 8 mph.

    High: 89 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Mostly cloudy, with a low around 70.

    Low: 70 °F

    Mostly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 93.

    High: 93 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 72.

    Low: 72 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 94.

    High: 94 °F

    Mostly Sunny

Detailed Forecast

This Afternoon
A slight chance of showers, with thunderstorms also possible after 2pm. Partly sunny, with a high near 87. North wind around 5 mph. Chance of precipitation is 20%.
Tonight
Partly cloudy, with a low around 65. North wind 3 to 6 mph.
Saturday
Mostly sunny, with a high near 85. North wind 5 to 8 mph.
Saturday Night
Partly cloudy, with a low around 65. East wind around 6 mph becoming calm in the evening.
Sunday
Mostly sunny, with a high near 89. South wind 5 to 8 mph.
Sunday Night
Mostly cloudy, with a low around 70.
Monday
Mostly sunny, with a high near 93.
Monday Night
Partly cloudy, with a low around 72.
Tuesday
Mostly sunny, with a high near 94.
Tuesday Night
A slight chance of showers and thunderstorms before 2am. Partly cloudy, with a low around 74. Chance of precipitation is 20%.
Wednesday
A slight chance of showers and thunderstorms. Mostly sunny, with a high near 94. Chance of precipitation is 20%.
Wednesday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 73. Chance of precipitation is 30%.
Thursday
A chance of showers and thunderstorms. Mostly sunny, with a high near 92. Chance of precipitation is 30%.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Loch Lomond VA
 38.78°N 77.47°W (Elev. 210 ft)
Last Update:
10:53 am EDT Aug 28, 2026
Forecast Valid:
12pm EDT Aug 28, 2026-6pm EDT Sep 3, 2026
 
Forecast Discussion
 
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Additional Resources

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation