Heavy Rain and Flash Flooding in the West; Heat Expands in the Central U.S.

Monsoonal moisture will produce showers and thunderstorms with heavy rain over parts of the Southwest, Great Basin, and Central Rockies through Monday. Flash flooding is possible, especially in and around burn scars and in areas of steep terrain. Heat will persist across the Central U.S. early this week, spreading into the Ohio Valley and Mid-Atlantic later this week. Read More >

Current conditions at

Gaithersburg - Montgomery County Airport (KGAI)

Lat: 39.17°NLon: 77.17°WElev: 495ft.

Partly Cloudy

70°F

21°C

Humidity	NA
Wind Speed	Calm
Barometer	30.10 in (1020.1 mb)
Dewpoint	N/A
Visibility	10.00 mi
Last update	31 Aug 3:56 am EDT

More Information:

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

Extended Forecast for

Ashton-Sandy Spring MD

Today
High: 87 °F
Slight Chance
Showers then
Scattered
T-storms
Tonight
Low: 73 °F
Scattered
T-storms then
Slight Chance
Showers
Tuesday
High: 93 °F
Sunny then
Scattered
T-storms
Tuesday Night
Low: 75 °F
Scattered
T-storms then
Partly Cloudy
Wednesday
High: 93 °F
Slight Chance
Showers then
Slight Chance
T-storms
Wednesday Night
Low: 75 °F
Slight Chance
T-storms then
Slight Chance
Showers
Thursday
High: 95 °F
Sunny then
Chance
T-storms
Thursday Night
Low: 71 °F
Chance
T-storms
Friday
High: 87 °F
Chance
Showers

Detailed Forecast

Today

A slight chance of showers between 11am and 2pm, then scattered showers and thunderstorms after 2pm. Mostly sunny, with a high near 87. Northeast wind 3 to 5 mph. Chance of precipitation is 40%.

Tonight

Scattered showers and thunderstorms before 11pm, then a slight chance of showers between 11pm and 2am. Mostly clear, with a low around 73. Southeast wind around 5 mph becoming southwest after midnight. Chance of precipitation is 30%.

Tuesday

Scattered showers and thunderstorms after 2pm. Increasing clouds, with a high near 93. West wind 5 to 8 mph. Chance of precipitation is 40%.

Tuesday Night

Scattered showers and thunderstorms before 11pm. Mostly cloudy during the early evening, then gradual clearing, with a low around 75. West wind 3 to 5 mph. Chance of precipitation is 50%.

Wednesday

A slight chance of showers, with thunderstorms also possible after 2pm. Mostly sunny, with a high near 93. Northeast wind around 5 mph. Chance of precipitation is 20%.

Wednesday Night

A slight chance of showers and thunderstorms. Mostly cloudy, with a low around 75. Chance of precipitation is 20%.

Thursday

A chance of showers and thunderstorms after 2pm. Mostly sunny, with a high near 95. Chance of precipitation is 30%.

Thursday Night

A chance of showers and thunderstorms before 2am, then a slight chance of showers. Mostly cloudy, with a low around 71. Chance of precipitation is 40%.

Friday

A slight chance of showers, then a chance of showers and thunderstorms after 2pm. Mostly sunny, with a high near 87. Chance of precipitation is 30%.

Friday Night

A chance of showers and thunderstorms, mainly before 8pm. Partly cloudy, with a low around 66. Chance of precipitation is 30%.

Saturday

Mostly sunny, with a high near 83.

Saturday Night

Partly cloudy, with a low around 63.

Sunday

Sunny, with a high near 80.