National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Severe Thunderstorm and Heavy Rainfall Threat Tonight; Heat Continues on Tuesday Across the Eastern U.S.

Severe weather and flash flooding threats continue across the Central Plains and Midwest into tonight. Very large hail, strong tornadoes and damaging winds are expected. An early season heat wave will continue to challenge temperature records across the eastern U.S. through Wednesday. Read More >

Current conditions at

Gaithersburg - Montgomery County Airport (KGAI)

Lat: 39.17°NLon: 77.17°WElev: 495ft.

Fair

78°F

26°C

Humidity 62%
Wind Speed SE 5 mph
Barometer 30.15 in (1021.8 mb)
Dewpoint 64°F (18°C)
Visibility 10.00 mi
Heat Index80°F (27°C)
Last update 18 May 11:56 pm EDT
Extended Forecast for

Ashton MD

  • Overnight

    Overnight: Mostly clear, with a low around 71. Southwest wind around 6 mph.

    Low: 71 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 95. West wind 5 to 7 mph.

    High: 95 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 73. South wind around 8 mph.

    Low: 73 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Showers and possibly a thunderstorm after 2pm. High near 94. West wind 6 to 8 mph, with gusts as high as 18 mph. Chance of precipitation is 90%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    High: 94 °F

    Sunny then
    Showers

  • Wednesday Night

    Wednesday Night: Showers and possibly a thunderstorm before 2am, then a chance of showers. Low around 57. North wind 5 to 8 mph. Chance of precipitation is 80%.

    Low: 57 °F

    Showers

  • Thursday

    Thursday: Showers likely, mainly between 8am and 2pm. Mostly cloudy, with a high near 68. Chance of precipitation is 60%.

    High: 68 °F

    Showers
    Likely

  • Thursday Night

    Thursday Night: A chance of showers before 8pm, then a chance of showers after 2am. Mostly cloudy, with a low around 52. Chance of precipitation is 40%.

    Low: 52 °F

    Chance
    Showers

  • Friday

    Friday: Showers likely, mainly after 8am. Mostly cloudy, with a high near 65. Chance of precipitation is 60%.

    High: 65 °F

    Showers
    Likely

  • Friday Night

    Friday Night: Showers. Low around 52. Chance of precipitation is 80%.

    Low: 52 °F

    Showers

Detailed Forecast

Overnight
Mostly clear, with a low around 71. Southwest wind around 6 mph.
Tuesday
Sunny, with a high near 95. West wind 5 to 7 mph.
Tuesday Night
Partly cloudy, with a low around 73. South wind around 8 mph.
Wednesday
Showers and possibly a thunderstorm after 2pm. High near 94. West wind 6 to 8 mph, with gusts as high as 18 mph. Chance of precipitation is 90%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Wednesday Night
Showers and possibly a thunderstorm before 2am, then a chance of showers. Low around 57. North wind 5 to 8 mph. Chance of precipitation is 80%.
Thursday
Showers likely, mainly between 8am and 2pm. Mostly cloudy, with a high near 68. Chance of precipitation is 60%.
Thursday Night
A chance of showers before 8pm, then a chance of showers after 2am. Mostly cloudy, with a low around 52. Chance of precipitation is 40%.
Friday
Showers likely, mainly after 8am. Mostly cloudy, with a high near 65. Chance of precipitation is 60%.
Friday Night
Showers. Low around 52. Chance of precipitation is 80%.
Saturday
Showers. High near 69. Chance of precipitation is 80%.
Saturday Night
Showers likely. Mostly cloudy, with a low around 57. Chance of precipitation is 60%.
Sunday
Showers likely. Mostly cloudy, with a high near 75. Chance of precipitation is 60%.
Sunday Night
Showers likely. Mostly cloudy, with a low around 59. Chance of precipitation is 60%.
Memorial Day
A chance of showers. Mostly cloudy, with a high near 76. Chance of precipitation is 40%.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Ashton MD
 39.15°N 76.98°W (Elev. 381 ft)
Last Update:
10:53 pm EDT May 18, 2026
Forecast Valid:
12am EDT May 19, 2026-6pm EDT May 25, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation