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

21°F

-6°C

Humidity 38%
Wind Speed E 7 mph
Barometer 30.22 in
Dewpoint 0°F (-18°C)
Visibility 10.00 mi
Wind Chill12°F (-11°C)
Last update 8 Dec 1:35 pm EST
Extended Forecast for

4 Miles SE Sinnamahoning PA

  • This Afternoon

    This Afternoon: Mostly cloudy, with a high near 23. Northeast wind 3 to 6 mph.

    High: 23 °F

    Mostly Cloudy

  • Tonight

    Tonight: Mostly cloudy, then gradually becoming mostly clear, with a low around 7. Wind chill values as low as zero. Calm wind.

    Low: 7 °F

    Decreasing
    Clouds

  • Tuesday

    Tuesday: A slight chance of snow showers between 3pm and 5pm. Increasing clouds, with a high near 30. Wind chill values as low as zero. South wind 5 to 8 mph, with gusts as high as 22 mph. Chance of precipitation is 20%.

    High: 30 °F

    Mostly Sunny
    then Slight
    Chance Snow
    Showers

  • Tuesday Night

    Tuesday Night: A slight chance of snow showers between 7pm and 1am, then snow likely after 1am. Cloudy, with a low around 25. Southwest wind around 9 mph, with gusts as high as 21 mph. Chance of precipitation is 70%. New snow accumulation of less than one inch possible.

    Low: 25 °F

    Slight Chance
    Snow Showers
    then Snow
    Likely

  • Wednesday

    Wednesday: Snow before 10am, then snow, possibly mixed with rain. High near 38. South wind around 9 mph, with gusts as high as 23 mph. Chance of precipitation is 100%. New snow accumulation of 1 to 3 inches possible.

    High: 38 °F

    Rain/Snow

  • Wednesday Night

    Wednesday Night: Snow likely, possibly mixed with rain, becoming all snow after 10pm. Cloudy, with a low around 24. Chance of precipitation is 70%. New snow accumulation of less than a half inch possible.

    Low: 24 °F

    Rain/Snow
    Likely then
    Snow Likely

  • Thursday

    Thursday: A chance of snow showers. Mostly cloudy, with a high near 28. Chance of precipitation is 50%.

    High: 28 °F

    Chance Snow
    Showers

  • Thursday Night

    Thursday Night: A chance of snow showers. Mostly cloudy, with a low around 19. Chance of precipitation is 40%.

    Low: 19 °F

    Chance Snow
    Showers

  • Friday

    Friday: A chance of snow showers. Mostly cloudy, with a high near 28. Chance of precipitation is 50%.

    High: 28 °F

    Chance Snow
    Showers

Detailed Forecast

This Afternoon
Mostly cloudy, with a high near 23. Northeast wind 3 to 6 mph.
Tonight
Mostly cloudy, then gradually becoming mostly clear, with a low around 7. Wind chill values as low as zero. Calm wind.
Tuesday
A slight chance of snow showers between 3pm and 5pm. Increasing clouds, with a high near 30. Wind chill values as low as zero. South wind 5 to 8 mph, with gusts as high as 22 mph. Chance of precipitation is 20%.
Tuesday Night
A slight chance of snow showers between 7pm and 1am, then snow likely after 1am. Cloudy, with a low around 25. Southwest wind around 9 mph, with gusts as high as 21 mph. Chance of precipitation is 70%. New snow accumulation of less than one inch possible.
Wednesday
Snow before 10am, then snow, possibly mixed with rain. High near 38. South wind around 9 mph, with gusts as high as 23 mph. Chance of precipitation is 100%. New snow accumulation of 1 to 3 inches possible.
Wednesday Night
Snow likely, possibly mixed with rain, becoming all snow after 10pm. Cloudy, with a low around 24. Chance of precipitation is 70%. New snow accumulation of less than a half inch possible.
Thursday
A chance of snow showers. Mostly cloudy, with a high near 28. Chance of precipitation is 50%.
Thursday Night
A chance of snow showers. Mostly cloudy, with a low around 19. Chance of precipitation is 40%.
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 17. Chance of precipitation is 70%.
Saturday
A chance of snow showers. Mostly cloudy, with a high near 26. Chance of precipitation is 50%.
Saturday Night
A chance of snow showers. Mostly cloudy, with a low around 12. Chance of precipitation is 40%.
Sunday
A chance of snow showers. Partly sunny, with a high near 23. Chance of precipitation is 40%.
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ABOUT THIS FORECAST

 
Point Forecast:
4 Miles SE Sinnamahoning PA
 41.34°N 78°W (Elev. 1906 ft)
Last Update:
1:05 pm EST Dec 8, 2025
Forecast Valid:
1pm EST Dec 8, 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