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

Hazardous Weather Conditions

Current conditions at

St Marys Municipal Airport (KOYM)

Lat: 41.41°NLon: 78.5°WElev: 1934ft.

Overcast

28°F

-2°C

Humidity 74%
Wind Speed W 8 mph
Barometer 30.43 in
Dewpoint 21°F (-6°C)
Visibility 10.00 mi
Wind Chill20°F (-7°C)
Last update 29 Nov 8:55 am EST
Extended Forecast for

3 Miles E Sinnamahoning PA

  • Today

    Today: Partly sunny, with a high near 35. West wind around 6 mph becoming calm in the afternoon.

    High: 35 °F

    Partly Sunny

  • Tonight

    Tonight: Snow showers likely, mainly after 1am. Cloudy, with a low around 27. Light southeast wind becoming south 9 to 14 mph in the evening. Winds could gust as high as 32 mph. Chance of precipitation is 70%. New snow accumulation of less than a half inch possible.

    Low: 27 °F

    Chance Snow
    Showers then
    Snow Showers
    Likely

  • Sunday

    Sunday: Snow showers before 10am, then snow showers, possibly mixed with rain. High near 40. South wind 11 to 14 mph becoming southwest in the afternoon. Winds could gust as high as 32 mph. Chance of precipitation is 90%. New snow accumulation of less than one inch possible.

    High: 40 °F

    Rain/Snow

  • Sunday Night

    Sunday Night: A chance of rain and snow showers before 7pm, then a chance of snow showers. Mostly cloudy, with a low around 25. West wind around 10 mph, with gusts as high as 28 mph. Chance of precipitation is 40%. New precipitation amounts of less than a tenth of an inch possible.

    Low: 25 °F

    Chance
    Rain/Snow
    then Chance
    Snow Showers

  • Monday

    Monday: Partly sunny, with a high near 33. Northwest wind 5 to 8 mph becoming calm in the afternoon. Winds could gust as high as 21 mph.

    High: 33 °F

    Partly Sunny

  • Monday Night

    Monday Night: A chance of snow showers after 1am. Cloudy, with a low around 23. Chance of precipitation is 50%. New snow accumulation of less than a half inch possible.

    Low: 23 °F

    Mostly Cloudy
    then Chance
    Snow Showers

  • Tuesday

    Tuesday: Snow showers. High near 33. Chance of precipitation is 80%.

    High: 33 °F

    Snow Showers

  • Tuesday Night

    Tuesday Night: A chance of snow showers before 1am. Mostly cloudy, with a low around 21. Chance of precipitation is 30%.

    Low: 21 °F

    Chance Snow
    Showers

  • Wednesday

    Wednesday: Partly sunny, with a high near 33.

    High: 33 °F

    Partly Sunny

Detailed Forecast

Today
Partly sunny, with a high near 35. West wind around 6 mph becoming calm in the afternoon.
Tonight
Snow showers likely, mainly after 1am. Cloudy, with a low around 27. Light southeast wind becoming south 9 to 14 mph in the evening. Winds could gust as high as 32 mph. Chance of precipitation is 70%. New snow accumulation of less than a half inch possible.
Sunday
Snow showers before 10am, then snow showers, possibly mixed with rain. High near 40. South wind 11 to 14 mph becoming southwest in the afternoon. Winds could gust as high as 32 mph. Chance of precipitation is 90%. New snow accumulation of less than one inch possible.
Sunday Night
A chance of rain and snow showers before 7pm, then a chance of snow showers. Mostly cloudy, with a low around 25. West wind around 10 mph, with gusts as high as 28 mph. Chance of precipitation is 40%. New precipitation amounts of less than a tenth of an inch possible.
Monday
Partly sunny, with a high near 33. Northwest wind 5 to 8 mph becoming calm in the afternoon. Winds could gust as high as 21 mph.
Monday Night
A chance of snow showers after 1am. Cloudy, with a low around 23. Chance of precipitation is 50%. New snow accumulation of less than a half inch possible.
Tuesday
Snow showers. High near 33. Chance of precipitation is 80%.
Tuesday Night
A chance of snow showers before 1am. Mostly cloudy, with a low around 21. Chance of precipitation is 30%.
Wednesday
Partly sunny, with a high near 33.
Wednesday Night
A chance of snow showers after 1am. Mostly cloudy, with a low around 21. Chance of precipitation is 30%.
Thursday
A chance of snow showers. Mostly cloudy, with a high near 30. Chance of precipitation is 30%.
Thursday Night
Mostly cloudy, with a low around 12.
Friday
A chance of snow showers. Mostly cloudy, with a high near 28. Chance of precipitation is 30%.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
3 Miles E Sinnamahoning PA
 41.38°N 78°W (Elev. 1988 ft)
Last Update:
8:41 am EST Nov 29, 2025
Forecast Valid:
9am EST Nov 29, 2025-6pm EST Dec 5, 2025
 
Forecast Discussion
 
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Additional Resources

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Chance of Precipitation