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

Baltimore / Martin (KMTN)

Lat: 39.33°NLon: 76.42°WElev: 23ft.

Overcast

76°F

24°C

Humidity 92%
Wind Speed Calm
Barometer 29.84 in
Dewpoint 74°F (23°C)
Visibility 10.00 mi
Heat Index76°F (24°C)
Last update 17 Aug 4:35 am EDT
Extended Forecast for

Glen Arm MD

  • Overnight

    Overnight: A slight chance of showers before 5am. Mostly cloudy, with a low around 69. West wind 3 to 5 mph. Chance of precipitation is 20%.

    Low: 69 °F

    Slight Chance
    Showers

  • Monday

    Monday: Mostly sunny, with a high near 88. Northwest wind 6 to 8 mph.

    High: 88 °F

    Mostly Sunny

  • Monday Night

    Monday Night: A chance of showers and thunderstorms before 8pm. Mostly cloudy, then gradually becoming mostly clear, with a low around 70. Light and variable wind. Chance of precipitation is 30%.

    Low: 70 °F

    Chance
    T-storms then
    Partly Cloudy

  • Tuesday

    Tuesday: Sunny, with a high near 85. North wind around 7 mph.

    High: 85 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 67. Light northwest wind.

    Low: 67 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 87.

    High: 87 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 69.

    Low: 69 °F

    Partly Cloudy

  • Thursday

    Thursday: A slight chance of showers, then showers likely and possibly a thunderstorm after 2pm. Partly sunny, with a high near 84. Chance of precipitation is 60%.

    High: 84 °F

    Slight Chance
    Showers then
    Showers
    Likely

  • Thursday Night

    Thursday Night: Showers likely and possibly a thunderstorm before 8pm, then a chance of showers. Mostly cloudy, with a low around 66. Chance of precipitation is 60%.

    Low: 66 °F

    Showers
    Likely

Detailed Forecast

Overnight
A slight chance of showers before 5am. Mostly cloudy, with a low around 69. West wind 3 to 5 mph. Chance of precipitation is 20%.
Monday
Mostly sunny, with a high near 88. Northwest wind 6 to 8 mph.
Monday Night
A chance of showers and thunderstorms before 8pm. Mostly cloudy, then gradually becoming mostly clear, with a low around 70. Light and variable wind. Chance of precipitation is 30%.
Tuesday
Sunny, with a high near 85. North wind around 7 mph.
Tuesday Night
Mostly clear, with a low around 67. Light northwest wind.
Wednesday
Sunny, with a high near 87.
Wednesday Night
Partly cloudy, with a low around 69.
Thursday
A slight chance of showers, then showers likely and possibly a thunderstorm after 2pm. Partly sunny, with a high near 84. Chance of precipitation is 60%.
Thursday Night
Showers likely and possibly a thunderstorm before 8pm, then a chance of showers. Mostly cloudy, with a low around 66. Chance of precipitation is 60%.
Friday
A chance of showers, mainly after 2pm. Partly sunny, with a high near 82. Chance of precipitation is 50%.
Friday Night
Showers and thunderstorms likely. Mostly cloudy, with a low around 66. Chance of precipitation is 60%.
Saturday
A chance of showers. Mostly cloudy, with a high near 81. Chance of precipitation is 50%.
Saturday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 66. Chance of precipitation is 50%.
Sunday
A slight chance of showers and thunderstorms. Partly sunny, with a high near 82. Chance of precipitation is 20%.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Glen Arm MD
 39.44°N 76.53°W (Elev. 312 ft)
Last Update:
4:30 am EDT Aug 17, 2026
Forecast Valid:
4am EDT Aug 17, 2026-6pm EDT Aug 23, 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