Thurmont, MD Weather

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FORECAST DISCUSSION
UPDATED National Weather Service Baltimore MD/Washington DC 1038 AM EDT Thu Aug 20 2026 .WHAT HAS CHANGED... While the severe threat is still there, extensive cloud cover may limit instability and severe wx risk. AI guidance has also trended down since yesterday. A special 18Z radiosonde will be launched later today at the request of SPC.

NWS LWX Office Area Forecast Discussion

IMMEDIATE FORECAST
Today

Today: Showers And Thunderstorms
Showers And T-Storms
Hi 76 °F
Showers and thunderstorms. Mostly cloudy, with a high near 76. North wind around 3 mph. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.

Tonight

Tonight: Scattered Showers And Thunderstorms then Patchy Fog
Scattered Showers And T-Storms then Patchy Fog
Lo 63 °F
Scattered showers and thunderstorms before 8pm, then patchy fog between 9pm and 2am. Partly cloudy, with a low around 63. North wind around 5 mph. Chance of precipitation is 50%. New rainfall amounts between a tenth and quarter of an inch possible.
THREE-DAY OUTLOOK
Friday

Friday: Mostly Sunny
Mostly Sunny
Hi 78 °F
Friday
Night
Friday Night: Showers And Thunderstorms Likely
Showers And T-Storms Likely
Lo 65 °F
Saturday

Saturday: Showers And Thunderstorms Likely
Showers And T-Storms Likely
Hi 79 °F
Saturday
Night
Saturday Night: Showers And Thunderstorms Likely
Showers And T-Storms Likely
Lo 65 °F
Sunday

Sunday: Partly Sunny then Slight Chance Showers And Thunderstorms
Partly Sunny then Slight Chance Showers And T-Storms
Hi 79 °F
Sunday
Night
Sunday Night: Slight Chance Showers And Thunderstorms then Mostly Clear
Slight Chance Showers And T-Storms then Mostly Clear
Lo 60 °F