Heat Building Across Much of the Country; Severe Thunderstorms and Heavy Rainfall in the Midwest

Dangerous heat will persist over the south-central Plains and Mid-South. This heat will spread south and east to the Lower Mississippi Valley, Gulf Coast, and Mid-Atlantic through Friday. Another heatwave is building across the Northwest and Northern High Plains through Saturday. Severe thunderstorms and flash flooding are expected across portions of the Great Lakes and Ohio Valley regions today. Read More >

Hazardous Weather Conditions

Current conditions at

Gaithersburg - Montgomery County Airport (KGAI)

Lat: 39.17°NLon: 77.17°WElev: 495ft.

A Few Clouds with Haze

92°F

33°C

Humidity	52%
Wind Speed	Vrbl 5 mph
Barometer	30.05 in (1018.3 mb)
Dewpoint	72°F (22°C)
Visibility	3.00 mi
Heat Index	100°F (38°C)
Last update	1 Aug 11:56 am EDT

More Information:

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

Extended Forecast for

Gaithersburg MD

Heat Advisory August 2, 12:00pm until August 2, 08:00pm

Heat Advisory August 1, 12:56pm until August 1, 08:00pm

Click here for hazard details and duration

Heat Advisory

Heat Advisory August 1, 12:56pm until August 1, 08:00pm
NOW until 8:00pm Thu
Heat Advisory
This Afternoon
High: 96 °F
Scattered
T-storms
Tonight
Low: 74 °F
Scattered
T-storms then
Isolated
Showers
Friday
High: 95 °F
Isolated
T-storms then
Showers
Likely
Friday Night
Low: 73 °F
Showers
Likely
Saturday
High: 91 °F
Slight Chance
T-storms then
Showers
Saturday Night
Low: 71 °F
Showers then
Chance
T-storms
Sunday
High: 88 °F
Chance
Showers then
Chance
T-storms
Sunday Night
Low: 70 °F
Chance
T-storms then
Mostly Clear

Detailed Forecast

This Afternoon

Isolated showers, then scattered showers and thunderstorms after 2pm. Mostly sunny, with a high near 96. Heat index values as high as 102. West wind around 6 mph. Chance of precipitation is 40%.

Tonight

Scattered showers and thunderstorms before 11pm, then isolated showers between 11pm and 2am. Mostly cloudy, with a low around 74. Light southeast wind. Chance of precipitation is 30%.

Friday

Isolated showers before 11am, then isolated showers and thunderstorms between 11am and 2pm, then showers likely and possibly a thunderstorm after 2pm. Mostly sunny, with a high near 95. Heat index values as high as 102. Calm wind becoming south 5 to 7 mph in the afternoon. Chance of precipitation is 60%. New rainfall amounts between a quarter and half of an inch possible.

Friday Night

Showers likely and possibly a thunderstorm before 2am, then a slight chance of showers and thunderstorms after 2am. Mostly cloudy, with a low around 73. Light south wind. Chance of precipitation is 70%. New rainfall amounts between a quarter and half of an inch possible.

Saturday

A slight chance of showers and thunderstorms, then showers and possibly a thunderstorm after 2pm. High near 91. South wind 3 to 8 mph. Chance of precipitation is 80%.

Saturday Night

Showers and possibly a thunderstorm before 8pm, then a chance of showers and thunderstorms, mainly between 8pm and 2am. Low around 71. Chance of precipitation is 80%.

Sunday

A chance of showers between 8am and 2pm, then a chance of showers and thunderstorms after 2pm. Partly sunny, with a high near 88. Chance of precipitation is 50%.

Sunday Night

A chance of thunderstorms before 8pm. Mostly clear, with a low around 70. Chance of precipitation is 30%.

Monday

Sunny, with a high near 93.

Monday Night

Partly cloudy, with a low around 69.

Tuesday

Sunny, with a high near 89.

Tuesday Night

Partly cloudy, with a low around 71.

Wednesday

A chance of showers and thunderstorms. Mostly sunny, with a high near 89. Chance of precipitation is 40%.