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

Watching Hurricane Erin; Heavy Rainfall Threat for Upper Midwest; Heatrisk for Mississippi Valley

Hurricane Erin continues to track westward with its outer bands bringing heavy rainfall and gusty winds for Puerto Rico and US Virgin Islands. Life-threatening surf and rip currents are occurring and will spread across the Atlantic coasts this week. Meanwhile, heavy rainfall and possible flooding are in the forecast for upper Midwest through Monday. Heatrisk continues for the Mississippi Valley. Read More >

Current conditions at

Frederick Municipal Airport (KFDK)

Lat: 39.42°NLon: 77.37°WElev: 269ft.

Mostly Cloudy

72°F

22°C

Humidity 94%
Wind Speed N 6 mph
Barometer 29.96 in
Dewpoint 70°F (21°C)
Visibility NA
Last update 18 Aug 2:25 am EDT
Extended Forecast for

Thurmont MD

  • Overnight

    Overnight: Mostly cloudy, with a low around 67. North wind 7 to 9 mph.

    Low: 67 °F

    Mostly Cloudy

  • Monday

    Monday: Mostly cloudy, with a high near 76. Northeast wind 7 to 9 mph, with gusts as high as 21 mph.

    High: 76 °F

    Mostly Cloudy

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 63. Northeast wind around 5 mph becoming calm in the evening.

    Low: 63 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: A slight chance of showers. Mostly cloudy, with a high near 75. East wind 3 to 5 mph. Chance of precipitation is 20%.

    High: 75 °F

    Slight Chance
    Showers

  • Tuesday Night

    Tuesday Night: A slight chance of showers after 2am. Mostly cloudy, with a low around 65. Light southeast wind. Chance of precipitation is 20%.

    Low: 65 °F

    Mostly Cloudy
    then Slight
    Chance
    Showers

  • Wednesday

    Wednesday: A slight chance of showers before 8am, then a slight chance of showers after 2pm. Mostly cloudy, with a high near 79. Chance of precipitation is 20%.

    High: 79 °F

    Mostly Cloudy
    then Slight
    Chance
    Showers

  • Wednesday Night

    Wednesday Night: A chance of showers between 8pm and 2am. Mostly cloudy, with a low around 65. Chance of precipitation is 30%.

    Low: 65 °F

    Chance
    Showers

  • Thursday

    Thursday: Partly sunny, with a high near 82.

    High: 82 °F

    Partly Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 63.

    Low: 63 °F

    Partly Cloudy

Detailed Forecast

Overnight
Mostly cloudy, with a low around 67. North wind 7 to 9 mph.
Monday
Mostly cloudy, with a high near 76. Northeast wind 7 to 9 mph, with gusts as high as 21 mph.
Monday Night
Mostly cloudy, with a low around 63. Northeast wind around 5 mph becoming calm in the evening.
Tuesday
A slight chance of showers. Mostly cloudy, with a high near 75. East wind 3 to 5 mph. Chance of precipitation is 20%.
Tuesday Night
A slight chance of showers after 2am. Mostly cloudy, with a low around 65. Light southeast wind. Chance of precipitation is 20%.
Wednesday
A slight chance of showers before 8am, then a slight chance of showers after 2pm. Mostly cloudy, with a high near 79. Chance of precipitation is 20%.
Wednesday Night
A chance of showers between 8pm and 2am. Mostly cloudy, with a low around 65. Chance of precipitation is 30%.
Thursday
Partly sunny, with a high near 82.
Thursday Night
Partly cloudy, with a low around 63.
Friday
Mostly sunny, with a high near 84.
Friday Night
Partly cloudy, with a low around 65.
Saturday
Mostly sunny, with a high near 85.
Saturday Night
A chance of showers. Mostly cloudy, with a low around 67. Chance of precipitation is 30%.
Sunday
A chance of showers. Partly sunny, with a high near 84. Chance of precipitation is 40%.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Thurmont MD
 39.64°N 77.41°W (Elev. 600 ft)
Last Update:
1:30 am EDT Aug 18, 2025
Forecast Valid:
2am EDT Aug 18, 2025-6pm EDT Aug 24, 2025
 
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