Areas of Dangerous Heat and Severe Thunderstorms

Dangerous heat will persist across the Southwest U.S. through Friday with daytime highs of 110-115°F. Heat across the southern Plains will briefly ease to near-normal by late week before returning over much of the Plains into next week. Scattered strong to severe thunderstorms are possible across parts of the Northeast U.S. on Thursday. Damaging wind, hail, and a tornado or two are possible. Read More >

Hazardous Weather Conditions

Hazardous Weather Outlook

Current conditions at

Gaithersburg - Montgomery County Airport (KGAI)

Lat: 39.17°NLon: 77.17°WElev: 495ft.

Overcast

73°F

23°C

Humidity	90%
Wind Speed	S 6 mph
Barometer	30.01 in (1017.0 mb)
Dewpoint	70°F (21°C)
Visibility	10.00 mi
Last update	27 Aug 4:56 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
T-storms then
Severe
Thunderstorms
Tonight
Low: 67 °F
Severe
Thunderstorms
then
Scattered
Showers and
Patchy Fog
Friday
High: 84 °F
Areas Fog
then Slight
Chance
T-storms
Friday Night
Low: 67 °F
Mostly Cloudy
Saturday
High: 85 °F
Mostly Sunny
Saturday Night
Low: 68 °F
Partly Cloudy
then Patchy
Fog
Sunday
High: 87 °F
Patchy Fog
then Mostly
Sunny
Sunday Night
Low: 71 °F
Partly Cloudy
Monday
High: 90 °F
Mostly Sunny

Detailed Forecast

Today

Scattered showers and thunderstorms before 3pm, then showers likely and possibly a thunderstorm between 3pm and 4pm, then scattered showers and thunderstorms after 4pm. Some of the storms could be severe. Partly sunny, with a high near 87. South wind 5 to 8 mph. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

Tonight

Showers and thunderstorms likely before 11pm, then scattered showers between 11pm and 2am. Some of the storms could be severe. Patchy fog after midnight. Otherwise, mostly cloudy, with a low around 67. Southeast wind around 5 mph becoming calm in the evening. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

Friday

A slight chance of showers and thunderstorms after 2pm. Areas of fog before 10am. Otherwise, partly sunny, with a high near 84. Light north wind. Chance of precipitation is 20%.

Friday Night

Mostly cloudy, with a low around 67. Calm wind.

Saturday

Mostly sunny, with a high near 85. Light east wind.

Saturday Night

Patchy fog after 3am. Otherwise, mostly clear, with a low around 68.

Sunday

Patchy fog before 7am. Otherwise, sunny, with a high near 87.

Sunday Night

Partly cloudy, with a low around 71.

Monday

Mostly sunny, with a high near 90.