Extreme Heat Across the Southern U.S.; Severe Thunderstorms and Heavy Rain in the Plains and Mississippi Valley

A heat wave over the Southwest will intensify late week, peaking and expanding into the Intermountain West and northern High Plains this weekend. Severe thunderstorms and heavy rain are expected over portions of the Plains and Mississippi Valley tonight, which will shift to parts of the Upper Midwest and mid-Mississippi Valley Friday. Monsoonal showers and flooding persist in the Desert Southwest. Read More >

Current conditions at

Washington/Dulles International Airport, DC (KIAD)

Lat: 38.93°NLon: 77.45°WElev: 312ft.

A Few Clouds

66°F

19°C

Humidity	81%
Wind Speed	W 3 mph
Barometer	30.00 in (1015.5 mb)
Dewpoint	60°F (16°C)
Visibility	10.00 mi
Last update	31 Jul 5:52 am EDT

More Information:

Local Forecast Office More Local Wx 3 Day History Hourly Weather Forecast

Extended Forecast for

Great Falls VA

Today
High: 88 °F
Sunny
Tonight
Low: 69 °F
Partly Cloudy
Saturday
High: 90 °F
Partly Sunny
Saturday Night
Low: 74 °F
Mostly Cloudy
Sunday
High: 87 °F
Mostly Cloudy
then Chance
Showers
Sunday Night
Low: 72 °F
Showers
Likely
Monday
High: 85 °F
Showers
Likely
Monday Night
Low: 69 °F
Showers
Likely then
Chance
T-storms
Tuesday
High: 87 °F
Partly Sunny
then Chance
T-storms

Detailed Forecast

Today

Sunny, with a high near 88. Northwest wind 3 to 5 mph.

Tonight

Partly cloudy, with a low around 69. Calm wind.

Saturday

Partly sunny, with a high near 90. Calm wind becoming south 5 to 9 mph in the morning. Winds could gust as high as 18 mph.

Saturday Night

Mostly cloudy, with a low around 74. South wind around 10 mph, with gusts as high as 20 mph.

Sunday

A chance of showers between 2pm and 5pm, then a chance of showers and thunderstorms after 5pm. Mostly cloudy, with a high near 87. South wind around 10 mph, with gusts as high as 22 mph. Chance of precipitation is 30%.

Sunday Night

A chance of showers and thunderstorms before 8pm, then showers likely and possibly a thunderstorm between 8pm and 2am, then a chance of showers and thunderstorms after 2am. Mostly cloudy, with a low around 72. Chance of precipitation is 70%.

Monday

A chance of showers, then showers likely and possibly a thunderstorm after 2pm. Mostly cloudy, with a high near 85. Chance of precipitation is 60%.

Monday Night

Showers likely and possibly a thunderstorm before 8pm, then a chance of showers and thunderstorms between 8pm and 2am. Mostly cloudy, with a low around 69. Chance of precipitation is 60%.

Tuesday

A chance of showers and thunderstorms after 2pm. Partly sunny, with a high near 87. Chance of precipitation is 40%.

Tuesday Night

A chance of showers and thunderstorms before 8pm, then a slight chance of showers between 8pm and 2am. Partly cloudy, with a low around 70. Chance of precipitation is 30%.

Wednesday

A chance of showers and thunderstorms. Partly sunny, with a high near 88. Chance of precipitation is 50%.

Wednesday Night

A chance of showers and thunderstorms. Mostly cloudy, with a low around 72. Chance of precipitation is 30%.

Thursday

A chance of showers and thunderstorms. Partly sunny, with a high near 89. Chance of precipitation is 30%.