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

28°F

-2°C

Humidity 69%
Wind Speed NW 15 G 23 mph
Barometer 30.11 in
Dewpoint 19°F (-7°C)
Visibility 10.00 mi
Wind Chill16°F (-9°C)
Last update 7 Dec 10:55 pm EST
Extended Forecast for

3 Miles E Sinnamahoning PA

  • Tonight

    Tonight: Occasional flurries before 1am. Cloudy, then gradually becoming partly cloudy, with a low around 12. North wind 7 to 9 mph, with gusts as high as 23 mph.

    Low: 12 °F

    Flurries

  • Monday

    Monday: Mostly sunny, with a high near 24. North wind around 6 mph becoming calm in the afternoon.

    High: 24 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 8. Calm wind.

    Low: 8 °F

    Partly Cloudy

  • Tuesday

    Tuesday: A chance of snow after 1pm. Mostly cloudy, with a high near 32. South wind 5 to 8 mph, with gusts as high as 21 mph. Chance of precipitation is 30%.

    High: 32 °F

    Mostly Cloudy
    then Chance
    Snow

  • Tuesday Night

    Tuesday Night: Snow likely, mainly after 1am. Cloudy, with a low around 28. Southwest wind around 8 mph, with gusts as high as 22 mph. Chance of precipitation is 60%. New snow accumulation of less than one inch possible.

    Low: 28 °F

    Slight Chance
    Snow then
    Snow Likely

  • Wednesday

    Wednesday: Rain and snow. High near 40. Chance of precipitation is 100%. New snow accumulation of less than one inch possible.

    High: 40 °F

    Rain/Snow

  • Wednesday Night

    Wednesday Night: Snow likely before 1am, then a chance of snow showers after 1am. Cloudy, with a low around 25. Chance of precipitation is 70%.

    Low: 25 °F

    Snow Likely

  • Thursday

    Thursday: A chance of snow showers. Mostly cloudy, with a high near 31. Chance of precipitation is 40%.

    High: 31 °F

    Chance Snow
    Showers

  • Thursday Night

    Thursday Night: A chance of snow showers. Mostly cloudy, with a low around 21. Chance of precipitation is 50%.

    Low: 21 °F

    Chance Snow
    Showers

Detailed Forecast

Tonight
Occasional flurries before 1am. Cloudy, then gradually becoming partly cloudy, with a low around 12. North wind 7 to 9 mph, with gusts as high as 23 mph.
Monday
Mostly sunny, with a high near 24. North wind around 6 mph becoming calm in the afternoon.
Monday Night
Partly cloudy, with a low around 8. Calm wind.
Tuesday
A chance of snow after 1pm. Mostly cloudy, with a high near 32. South wind 5 to 8 mph, with gusts as high as 21 mph. Chance of precipitation is 30%.
Tuesday Night
Snow likely, mainly after 1am. Cloudy, with a low around 28. Southwest wind around 8 mph, with gusts as high as 22 mph. Chance of precipitation is 60%. New snow accumulation of less than one inch possible.
Wednesday
Rain and snow. High near 40. Chance of precipitation is 100%. New snow accumulation of less than one inch possible.
Wednesday Night
Snow likely before 1am, then a chance of snow showers after 1am. Cloudy, with a low around 25. Chance of precipitation is 70%.
Thursday
A chance of snow showers. Mostly cloudy, with a high near 31. Chance of precipitation is 40%.
Thursday Night
A chance of snow showers. Mostly cloudy, with a low around 21. Chance of precipitation is 50%.
Friday
A chance of snow showers. Mostly cloudy, with a high near 28. Chance of precipitation is 50%.
Friday Night
Snow showers likely. Mostly cloudy, with a low around 15. Chance of precipitation is 60%.
Saturday
Snow showers likely. Mostly cloudy, with a high near 23. Chance of precipitation is 60%.
Saturday Night
A chance of snow showers. Mostly cloudy, with a low around 13. Chance of precipitation is 40%.
Sunday
A chance of snow showers. Mostly cloudy, with a high near 22. 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:
9:21 pm EST Dec 7, 2025
Forecast Valid:
10pm EST Dec 7, 2025-6pm EST Dec 14, 2025
 
Forecast Discussion
 
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Additional Resources

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High Temperature

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Chance of Precipitation