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.

Overcast

36°F

2°C

Humidity 87%
Wind Speed NW 3 mph
Barometer 30.21 in
Dewpoint 32°F (0°C)
Visibility 10.00 mi
Last update 10 Jan 1:35 am EST
Extended Forecast for

3 Miles S De Young PA

  • Overnight

    Overnight: Patchy fog. Otherwise, mostly cloudy, with a low around 30. Calm wind.

    Low: 30 °F

    Patchy Fog

  • Saturday

    Saturday: Rain, mainly after 4pm. Patchy fog before 9am. High near 40. Southeast wind 3 to 7 mph. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.

    High: 40 °F

    Slight Chance
    Rain and
    Patchy Fog
    then Rain

  • Saturday Night

    Saturday Night: Rain before 10pm, then a chance of showers between 10pm and midnight. Low around 24. South wind 7 to 11 mph becoming west after midnight. Winds could gust as high as 25 mph. Chance of precipitation is 100%. New precipitation amounts between a tenth and quarter of an inch possible.

    Low: 24 °F

    Rain then
    Mostly Cloudy

  • Sunday

    Sunday: Snow showers, mainly after 1pm. High near 29. West wind 10 to 16 mph, with gusts as high as 37 mph. Chance of precipitation is 80%. New snow accumulation of less than one inch possible.

    High: 29 °F

    Chance Snow
    Showers then
    Snow Showers

  • Sunday Night

    Sunday Night: A slight chance of snow showers before 1am. Mostly cloudy, with a low around 22. West wind 13 to 17 mph, with gusts as high as 36 mph. Chance of precipitation is 20%.

    Low: 22 °F

    Slight Chance
    Snow Showers

  • Monday

    Monday: Partly sunny, with a high near 32.

    High: 32 °F

    Partly Sunny

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 26.

    Low: 26 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: Partly sunny, with a high near 39.

    High: 39 °F

    Partly Sunny

  • Tuesday Night

    Tuesday Night: A chance of showers. Mostly cloudy, with a low around 32. Chance of precipitation is 50%.

    Low: 32 °F

    Chance
    Showers

Detailed Forecast

Overnight
Patchy fog. Otherwise, mostly cloudy, with a low around 30. Calm wind.
Saturday
Rain, mainly after 4pm. Patchy fog before 9am. High near 40. Southeast wind 3 to 7 mph. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.
Saturday Night
Rain before 10pm, then a chance of showers between 10pm and midnight. Low around 24. South wind 7 to 11 mph becoming west after midnight. Winds could gust as high as 25 mph. Chance of precipitation is 100%. New precipitation amounts between a tenth and quarter of an inch possible.
Sunday
Snow showers, mainly after 1pm. High near 29. West wind 10 to 16 mph, with gusts as high as 37 mph. Chance of precipitation is 80%. New snow accumulation of less than one inch possible.
Sunday Night
A slight chance of snow showers before 1am. Mostly cloudy, with a low around 22. West wind 13 to 17 mph, with gusts as high as 36 mph. Chance of precipitation is 20%.
Monday
Partly sunny, with a high near 32.
Monday Night
Mostly cloudy, with a low around 26.
Tuesday
Partly sunny, with a high near 39.
Tuesday Night
A chance of showers. Mostly cloudy, with a low around 32. Chance of precipitation is 50%.
Wednesday
A chance of rain showers before 1pm, then rain and snow showers likely. Mostly cloudy, with a high near 36. Chance of precipitation is 60%.
Wednesday Night
A chance of snow showers. Mostly cloudy, with a low around 16. Chance of precipitation is 50%.
Thursday
Mostly sunny, with a high near 22.
Thursday Night
Partly cloudy, with a low around 12.
Friday
A chance of snow showers. Partly sunny, with a high near 26. Chance of precipitation is 30%.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
3 Miles S De Young PA
 41.53°N 78.91°W (Elev. 1831 ft)
Last Update:
1:06 am EST Jan 10, 2026
Forecast Valid:
1am EST Jan 10, 2026-6pm EST Jan 16, 2026
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation