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

30°F

-1°C

Humidity 80%
Wind Speed SW 8 mph
Barometer 30.02 in
Dewpoint 25°F (-4°C)
Visibility 10.00 mi
Wind Chill22°F (-6°C)
Last update 7 Dec 7:15 am EST
Extended Forecast for

Sinnamahoning PA

  • Today

    Today: A slight chance of snow after 1pm. Cloudy, with a high near 34. Southwest wind 5 to 8 mph. Chance of precipitation is 20%.

    High: 34 °F

    Cloudy then
    Slight Chance
    Snow

  • Tonight

    Tonight: Cloudy during the early evening, then gradual clearing, with a low around 13. West wind 7 to 9 mph becoming north after midnight. Winds could gust as high as 21 mph.

    Low: 13 °F

    Gradual
    Clearing

  • Monday

    Monday: Mostly sunny, with a high near 23. North wind 5 to 7 mph becoming calm in the afternoon.

    High: 23 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 8. Wind chill values as low as zero. Calm wind becoming south around 6 mph after midnight.

    Low: 8 °F

    Partly Cloudy

  • Tuesday

    Tuesday: A chance of snow after 1pm. Mostly cloudy, with a high near 32. South wind 6 to 10 mph, with gusts as high as 22 mph. Chance of precipitation is 30%.

    High: 32 °F

    Partly Sunny
    then Chance
    Snow

  • Tuesday Night

    Tuesday Night: Snow likely, mainly after 1am. Cloudy, with a low around 29. Chance of precipitation is 60%. New snow accumulation of less than a half inch possible.

    Low: 29 °F

    Slight Chance
    Snow then
    Snow Likely

  • Wednesday

    Wednesday: Snow before 1pm, then rain and snow. High near 39. Chance of precipitation is 90%.

    High: 39 °F

    Snow then
    Rain/Snow

  • Wednesday Night

    Wednesday Night: Rain and snow likely before 1am, then a chance of snow. Mostly cloudy, with a low around 26. Chance of precipitation is 70%.

    Low: 26 °F

    Rain/Snow
    Likely

  • Thursday

    Thursday: A chance of snow. Mostly cloudy, with a high near 32. Chance of precipitation is 40%.

    High: 32 °F

    Chance Snow

Detailed Forecast

Today
A slight chance of snow after 1pm. Cloudy, with a high near 34. Southwest wind 5 to 8 mph. Chance of precipitation is 20%.
Tonight
Cloudy during the early evening, then gradual clearing, with a low around 13. West wind 7 to 9 mph becoming north after midnight. Winds could gust as high as 21 mph.
Monday
Mostly sunny, with a high near 23. North wind 5 to 7 mph becoming calm in the afternoon.
Monday Night
Partly cloudy, with a low around 8. Wind chill values as low as zero. Calm wind becoming south around 6 mph after midnight.
Tuesday
A chance of snow after 1pm. Mostly cloudy, with a high near 32. South wind 6 to 10 mph, with gusts as high as 22 mph. Chance of precipitation is 30%.
Tuesday Night
Snow likely, mainly after 1am. Cloudy, with a low around 29. Chance of precipitation is 60%. New snow accumulation of less than a half inch possible.
Wednesday
Snow before 1pm, then rain and snow. High near 39. Chance of precipitation is 90%.
Wednesday Night
Rain and snow likely before 1am, then a chance of snow. Mostly cloudy, with a low around 26. Chance of precipitation is 70%.
Thursday
A chance of snow. Mostly cloudy, with a high near 32. Chance of precipitation is 40%.
Thursday Night
A chance of snow. Mostly cloudy, with a low around 23. Chance of precipitation is 50%.
Friday
Snow likely. Mostly cloudy, with a high near 30. Chance of precipitation is 60%.
Friday Night
A chance of snow. Mostly cloudy, with a low around 14. Chance of precipitation is 50%.
Saturday
Snow likely. Mostly cloudy, with a high near 22. Chance of precipitation is 60%.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Sinnamahoning PA
 41.39°N 78.05°W (Elev. 1998 ft)
Last Update:
7:06 am EST Dec 7, 2025
Forecast Valid:
7am EST Dec 7, 2025-6pm EST Dec 13, 2025
 
Forecast Discussion
 
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Additional Resources

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Chance of Precipitation