Thunderstorms and Heavy Rains in the Appalachians

Multiple rounds of moderate to locally heavy rain will impact portions of the Appalachians and Mid-Atlantic, which may lead to flash flooding concerns. Thunderstorms with isolated severe wind gusts will be possible this afternoon from parts of the Southeast into the southern and central Appalachians. A multi-day heavy rain will pose a flash flood threat in New Mexico beginning Tuesday. Read More >

Current conditions at

Gaithersburg - Montgomery County Airport (KGAI)

Lat: 39.17°NLon: 77.17°WElev: 495ft.

Light Rain

64°F

18°C

Humidity	NA
Wind Speed	Calm
Barometer	30.09 in (1020.2 mb)
Dewpoint	N/A
Visibility	4.00 mi
Last update	21 Sep 4:56 pm EDT

More Information:

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

Extended Forecast for

Ashton-Sandy Spring MD

This Afternoon
High: 70 °F
Chance
Showers
Tonight
Low: 59 °F
Chance
Showers then
Showers
Tuesday
High: 62 °F
Showers and
Patchy Fog
Tuesday Night
Low: 53 °F
Showers and
Patchy Fog
Wednesday
High: 63 °F
Rain Likely
Wednesday Night
Low: 52 °F
Slight Chance
Rain
Thursday
High: 65 °F
Partly Sunny
Thursday Night
Low: 49 °F
Mostly Cloudy
Friday
High: 64 °F
Mostly Sunny
then Slight
Chance
Showers

Detailed Forecast

This Afternoon

A chance of showers. Cloudy, with a high near 70. Northeast wind around 7 mph. Chance of precipitation is 50%.

Tonight

Showers likely, then showers and possibly a thunderstorm after 2am. Low around 59. East wind around 9 mph, with gusts as high as 20 mph. Chance of precipitation is 80%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

Tuesday

Showers and possibly a thunderstorm. Patchy fog. High near 62. Northeast wind around 14 mph, with gusts as high as 24 mph. Chance of precipitation is 80%. New rainfall amounts between a quarter and half of an inch possible.

Tuesday Night

Showers before 2am, then rain, mainly after 2am. Patchy fog before 11pm. Low around 53. Northeast wind around 13 mph, with gusts as high as 24 mph. Chance of precipitation is 80%. New precipitation amounts between a quarter and half of an inch possible.

Wednesday

Rain likely, mainly before 2pm. Cloudy, with a high near 63. Northeast wind around 14 mph, with gusts as high as 24 mph. Chance of precipitation is 60%.

Wednesday Night

A slight chance of rain before 2am. Mostly cloudy, with a low around 52. Chance of precipitation is 20%.

Thursday

Partly sunny, with a high near 65.

Thursday Night

Mostly cloudy, with a low around 49.

Friday

A slight chance of showers after 2pm. Mostly sunny, with a high near 64. Chance of precipitation is 20%.

Friday Night

Partly cloudy, with a low around 50.

Saturday

Mostly sunny, with a high near 65.