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

St Marys Municipal Airport (KOYM)

Lat: 41.41°NLon: 78.5°WElev: 1934ft.

Fair

68°F

20°C

Humidity 88%
Wind Speed Calm
Barometer 30.12 in
Dewpoint 64°F (18°C)
Visibility 10.00 mi
Last update 30 Jul 3:55 am EDT
Extended Forecast for

3 Miles S De Young PA

  • Today

    Today: Areas of fog before 7am. Otherwise, mostly sunny, with a high near 90. Calm wind becoming west around 6 mph in the afternoon.

    High: 90 °F

    Areas Fog
    then Mostly
    Sunny

  • Tonight

    Tonight: Partly cloudy, with a low around 63. Light and variable wind.

    Low: 63 °F

    Partly Cloudy

  • Thursday

    Thursday: A slight chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 8am. Mostly cloudy, with a high near 75. Northeast wind around 6 mph. Chance of precipitation is 70%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    High: 75 °F

    Showers
    Likely

  • Thursday Night

    Thursday Night: A chance of showers and thunderstorms. Mostly cloudy, with a low around 56. Northeast wind around 6 mph. Chance of precipitation is 40%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    Low: 56 °F

    Chance
    T-storms

  • Friday

    Friday: A slight chance of showers before 2pm. Partly sunny, with a high near 73. Northeast wind 6 to 8 mph. Chance of precipitation is 20%.

    High: 73 °F

    Slight Chance
    Showers

  • Friday Night

    Friday Night: Mostly clear, with a low around 50.

    Low: 50 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 77.

    High: 77 °F

    Sunny

  • Saturday Night

    Saturday Night: Clear, with a low around 50.

    Low: 50 °F

    Clear

  • Sunday

    Sunday: Sunny, with a high near 80.

    High: 80 °F

    Sunny

Detailed Forecast

Today
Areas of fog before 7am. Otherwise, mostly sunny, with a high near 90. Calm wind becoming west around 6 mph in the afternoon.
Tonight
Partly cloudy, with a low around 63. Light and variable wind.
Thursday
A slight chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 8am. Mostly cloudy, with a high near 75. Northeast wind around 6 mph. Chance of precipitation is 70%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Thursday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 56. Northeast wind around 6 mph. Chance of precipitation is 40%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Friday
A slight chance of showers before 2pm. Partly sunny, with a high near 73. Northeast wind 6 to 8 mph. Chance of precipitation is 20%.
Friday Night
Mostly clear, with a low around 50.
Saturday
Sunny, with a high near 77.
Saturday Night
Clear, with a low around 50.
Sunday
Sunny, with a high near 80.
Sunday Night
Mostly clear, with a low around 53.
Monday
Mostly sunny, with a high near 82.
Monday Night
Partly cloudy, with a low around 56.
Tuesday
A chance of showers. Partly sunny, with a high near 80. Chance of precipitation is 30%.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
3 Miles S De Young PA
 41.53°N 78.91°W (Elev. 1831 ft)
Last Update:
2:15 am EDT Jul 30, 2025
Forecast Valid:
4am EDT Jul 30, 2025-6pm EDT Aug 5, 2025
 
Forecast Discussion
 
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Additional Resources

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation