Extreme Heat and Excessive Rainfall This Week

A significant heat wave continues for the Rockies, Northern Plains, and Great Lakes into the Mid-Atlantic, peaking in intensity through midweek and lingering across parts of the Northern Plains and Midwest until this weekend. Excessive rainfall my bring life-threatening and locally catastrophic flash and urban flooding across portions of southwestern Texas through early Friday. Read More >

Hazardous Weather Conditions

Current conditions at

Gaithersburg - Montgomery County Airport (KGAI)

Lat: 39.17°NLon: 77.17°WElev: 495ft.

Fair

83°F

28°C

Humidity	72%
Wind Speed	W 9 mph
Barometer	30.04 in (1018.2 mb)
Dewpoint	73°F (23°C)
Visibility	10.00 mi
Heat Index	89°F (32°C)
Last update	15 Jul 9:56 am EDT

More Information:

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

Extended Forecast for

Derwood MD

Heat Advisory July 15, 11:00am until July 15, 08:00pm

Click here for hazard details and duration

Heat Advisory

Today
High: 99 °F
Hot
Tonight
Low: 77 °F
Partly Cloudy
Thursday
High: 98 °F
Patchy Smoke
Thursday Night
Low: 74 °F
Partly Cloudy
Friday
High: 93 °F
Mostly Sunny
then Slight
Chance
T-storms
Friday Night
Low: 73 °F
Chance
T-storms
Saturday
High: 88 °F
Showers
Saturday Night
Low: 71 °F
Showers
Sunday
High: 88 °F
Mostly Sunny
then Chance
T-storms

Detailed Forecast

Today

Sunny and hot, with a high near 99. West wind around 7 mph.

Tonight

Partly cloudy, with a low around 77. West wind around 5 mph becoming calm in the evening.

Thursday

Patchy smoke. Mostly sunny and hot, with a high near 98. Heat index values as high as 103. Calm wind becoming west 5 to 8 mph in the afternoon.

Thursday Night

Partly cloudy, with a low around 74. North wind around 6 mph.

Friday

A slight chance of showers between 2pm and 5pm, then a slight chance of showers and thunderstorms after 5pm. Mostly sunny, with a high near 93. Light north wind. Chance of precipitation is 20%.

Friday Night

A chance of showers and thunderstorms, mainly after 8pm. Mostly cloudy, with a low around 73. Chance of precipitation is 50%.

Saturday

Showers and possibly a thunderstorm. High near 88. Chance of precipitation is 80%.

Saturday Night

Showers and possibly a thunderstorm before 2am, then a slight chance of showers. Low around 71. Chance of precipitation is 80%.

Sunday

A slight chance of showers before 8am, then a chance of showers and thunderstorms after 2pm. Mostly sunny, with a high near 88. Chance of precipitation is 40%.

Sunday Night

A chance of showers and thunderstorms before 8pm. Partly cloudy, with a low around 69. Chance of precipitation is 30%.

Monday

A slight chance of showers and thunderstorms. Mostly sunny, with a high near 89. Chance of precipitation is 20%.

Monday Night

A chance of showers and thunderstorms. Partly cloudy, with a low around 71. Chance of precipitation is 30%.

Tuesday

A chance of showers and thunderstorms. Partly sunny, with a high near 90. Chance of precipitation is 50%.