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

18°F

-8°C

Humidity 73%
Wind Speed S 3 mph
Barometer 30.10 in
Dewpoint 10°F (-12°C)
Visibility 10.00 mi
Last update 15 Dec 6:35 pm EST
Extended Forecast for

3 Miles NW Sinnamahoning PA

  • Tonight

    Tonight: Snow showers likely before 7pm. Partly cloudy, with a low around 8. Wind chill values as low as zero. Southwest wind around 7 mph. Chance of precipitation is 70%. Total nighttime snow accumulation of less than a half inch possible.

    Low: 8 °F

    Snow Showers
    Likely then
    Partly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 27. Wind chill values as low as zero. Southwest wind around 6 mph.

    High: 27 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a temperature rising to around 30 by 4am. Southwest wind 7 to 11 mph, with gusts as high as 24 mph.

    Low: 23 °F⇑

    Partly Cloudy

  • Wednesday

    Wednesday: Mostly cloudy, with a high near 37. Southwest wind 9 to 13 mph, with gusts as high as 26 mph.

    High: 37 °F

    Mostly Cloudy

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 23. West wind 6 to 8 mph becoming southeast after midnight.

    Low: 23 °F

    Mostly Cloudy

  • Thursday

    Thursday: A chance of showers after 1pm. Partly sunny, with a high near 43. Chance of precipitation is 30%.

    High: 43 °F

    Partly Sunny
    then Chance
    Showers

  • Thursday Night

    Thursday Night: Rain showers before 1am, then rain and snow showers. Low around 25. Chance of precipitation is 100%.

    Low: 25 °F

    Showers then
    Rain/Snow

  • Friday

    Friday: A chance of snow showers before 1pm. Mostly cloudy, with a high near 32. Chance of precipitation is 40%.

    High: 32 °F

    Chance Snow
    Showers

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 17.

    Low: 17 °F

    Mostly Cloudy

Detailed Forecast

Tonight
Snow showers likely before 7pm. Partly cloudy, with a low around 8. Wind chill values as low as zero. Southwest wind around 7 mph. Chance of precipitation is 70%. Total nighttime snow accumulation of less than a half inch possible.
Tuesday
Mostly sunny, with a high near 27. Wind chill values as low as zero. Southwest wind around 6 mph.
Tuesday Night
Partly cloudy, with a temperature rising to around 30 by 4am. Southwest wind 7 to 11 mph, with gusts as high as 24 mph.
Wednesday
Mostly cloudy, with a high near 37. Southwest wind 9 to 13 mph, with gusts as high as 26 mph.
Wednesday Night
Mostly cloudy, with a low around 23. West wind 6 to 8 mph becoming southeast after midnight.
Thursday
A chance of showers after 1pm. Partly sunny, with a high near 43. Chance of precipitation is 30%.
Thursday Night
Rain showers before 1am, then rain and snow showers. Low around 25. Chance of precipitation is 100%.
Friday
A chance of snow showers before 1pm. Mostly cloudy, with a high near 32. Chance of precipitation is 40%.
Friday Night
Mostly cloudy, with a low around 17.
Saturday
Mostly cloudy, with a high near 35.
Saturday Night
A chance of snow showers. Mostly cloudy, with a low around 28. Chance of precipitation is 40%.
Sunday
A chance of rain and snow showers. Partly sunny, with a high near 36. Chance of precipitation is 30%.
Sunday Night
A chance of snow showers. Mostly cloudy, with a low around 21. Chance of precipitation is 30%.
Monday
A chance of snow showers. Partly sunny, with a high near 32. Chance of precipitation is 30%.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
3 Miles NW Sinnamahoning PA
 41.41°N 78.11°W (Elev. 2169 ft)
Last Update:
3:21 pm EST Dec 15, 2025
Forecast Valid:
6pm EST Dec 15, 2025-6pm EST Dec 22, 2025
 
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