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

Severe Thunderstorms and Flooding from the Southern Plains to the Great Lakes; Record Heat in the East

Widely scattered severe thunderstorms may produce damaging winds, hail, and flash flooding from the southern Plains into the lower Great Lakes. Elevated to locally critical fire weather conditions will persist across portions of the Southwest and Southern High Plains due to gusty winds and dry conditions. An early-season heatwave will challenge temperature records across the eastern U.S.. Read More >

Current conditions at

St Marys County Airport (K2W6)

Lat: 38.32°NLon: 76.55°WElev: 144ft.

Fair

79°F

26°C

Humidity 59%
Wind Speed SW 7 mph
Barometer 30.06 in
Dewpoint 63°F (17°C)
Visibility 10.00 mi
Heat Index81°F (27°C)
Last update 20 May 1:55 am EDT
Extended Forecast for

3 Miles NNW Chaptico MD

  • Overnight

    Overnight: Mostly clear, with a low around 72. Southwest wind around 8 mph.

    Low: 72 °F

    Mostly Clear

  • Wednesday

    Wednesday: A slight chance of showers between 4pm and 5pm, then a chance of showers and thunderstorms after 5pm. Increasing clouds, with a high near 95. Southwest wind 3 to 7 mph. Chance of precipitation is 30%.

    High: 95 °F

    Sunny then
    Chance
    T-storms

  • Wednesday Night

    Wednesday Night: A chance of showers and thunderstorms before 11pm, then showers likely and possibly a thunderstorm between 11pm and 2am, then a chance of showers after 2am. Mostly cloudy, with a low around 60. North wind 3 to 7 mph. Chance of precipitation is 60%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    Low: 60 °F

    Showers
    Likely

  • Thursday

    Thursday: A chance of showers, with thunderstorms also possible after 2pm. Cloudy, with a high near 68. Northeast wind 9 to 13 mph. Chance of precipitation is 50%.

    High: 68 °F

    Chance
    Showers

  • Thursday Night

    Thursday Night: A chance of showers and thunderstorms, then showers likely after 11pm. Cloudy, with a low around 52. Northeast wind 6 to 9 mph. Chance of precipitation is 70%.

    Low: 52 °F

    Chance
    Showers then
    Showers
    Likely

  • Friday

    Friday: Showers likely, with thunderstorms also possible after 5pm. Cloudy, with a high near 63. Chance of precipitation is 70%.

    High: 63 °F

    Showers
    Likely

  • Friday Night

    Friday Night: Showers likely. Mostly cloudy, with a low around 52. Chance of precipitation is 70%.

    Low: 52 °F

    Showers
    Likely

  • Saturday

    Saturday: Showers likely. Mostly cloudy, with a high near 69. Chance of precipitation is 60%.

    High: 69 °F

    Showers
    Likely

  • Saturday Night

    Saturday Night: Showers likely, mainly before 2am. Mostly cloudy, with a low around 59. Chance of precipitation is 70%.

    Low: 59 °F

    Showers
    Likely

Detailed Forecast

Overnight
Mostly clear, with a low around 72. Southwest wind around 8 mph.
Wednesday
A slight chance of showers between 4pm and 5pm, then a chance of showers and thunderstorms after 5pm. Increasing clouds, with a high near 95. Southwest wind 3 to 7 mph. Chance of precipitation is 30%.
Wednesday Night
A chance of showers and thunderstorms before 11pm, then showers likely and possibly a thunderstorm between 11pm and 2am, then a chance of showers after 2am. Mostly cloudy, with a low around 60. North wind 3 to 7 mph. Chance of precipitation is 60%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Thursday
A chance of showers, with thunderstorms also possible after 2pm. Cloudy, with a high near 68. Northeast wind 9 to 13 mph. Chance of precipitation is 50%.
Thursday Night
A chance of showers and thunderstorms, then showers likely after 11pm. Cloudy, with a low around 52. Northeast wind 6 to 9 mph. Chance of precipitation is 70%.
Friday
Showers likely, with thunderstorms also possible after 5pm. Cloudy, with a high near 63. Chance of precipitation is 70%.
Friday Night
Showers likely. Mostly cloudy, with a low around 52. Chance of precipitation is 70%.
Saturday
Showers likely. Mostly cloudy, with a high near 69. Chance of precipitation is 60%.
Saturday Night
Showers likely, mainly before 2am. Mostly cloudy, with a low around 59. Chance of precipitation is 70%.
Sunday
A chance of showers. Mostly cloudy, with a high near 76. Chance of precipitation is 50%.
Sunday Night
A chance of showers. Mostly cloudy, with a low around 61. Chance of precipitation is 50%.
Memorial Day
Showers likely and possibly a thunderstorm. Mostly cloudy, with a high near 78. Chance of precipitation is 60%.
Monday Night
Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 62. Chance of precipitation is 60%.
Tuesday
A chance of showers and thunderstorms. Mostly cloudy, with a high near 79. Chance of precipitation is 50%.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
3 Miles NNW Chaptico MD
 38.39°N 76.79°W (Elev. 102 ft)
Last Update:
11:57 pm EDT May 19, 2026
Forecast Valid:
2am EDT May 20, 2026-6pm EDT May 26, 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