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

27°F

-3°C

Humidity 74%
Wind Speed Calm
Barometer 30.00 in
Dewpoint 19°F (-7°C)
Visibility 10.00 mi
Last update 18 Jan 1:15 am EST
Extended Forecast for

6 Miles ESE Sinnamahoning PA

  • Overnight

    Overnight: A slight chance of snow after 2am. Mostly cloudy, with a low around 20. West wind around 6 mph. Chance of precipitation is 20%.

    Low: 20 °F

    Slight Chance
    Snow

  • Sunday

    Sunday: Partly sunny, with a high near 24. West wind around 8 mph.

    High: 24 °F

    Partly Sunny

  • Sunday Night

    Sunday Night: Mostly cloudy, with a low around 16. West wind around 9 mph.

    Low: 16 °F

    Mostly Cloudy

  • M.L.King Day

    M.L.King Day: A chance of snow, mainly between 8am and 1pm. Mostly cloudy, with a high near 24. Southwest wind 10 to 14 mph, with gusts as high as 33 mph. Chance of precipitation is 40%.

    High: 24 °F

    Chance Snow

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 3. West wind 11 to 14 mph, with gusts as high as 34 mph.

    Low: 3 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 13.

    High: 13 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 5.

    Low: 5 °F

    Mostly Clear

  • Wednesday

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

    High: 30 °F

    Partly Sunny
    then Chance
    Snow

  • Wednesday Night

    Wednesday Night: A chance of snow. Mostly cloudy, with a low around 20. Chance of precipitation is 40%.

    Low: 20 °F

    Chance Snow

Detailed Forecast

Overnight
A slight chance of snow after 2am. Mostly cloudy, with a low around 20. West wind around 6 mph. Chance of precipitation is 20%.
Sunday
Partly sunny, with a high near 24. West wind around 8 mph.
Sunday Night
Mostly cloudy, with a low around 16. West wind around 9 mph.
M.L.King Day
A chance of snow, mainly between 8am and 1pm. Mostly cloudy, with a high near 24. Southwest wind 10 to 14 mph, with gusts as high as 33 mph. Chance of precipitation is 40%.
Monday Night
Mostly cloudy, with a low around 3. West wind 11 to 14 mph, with gusts as high as 34 mph.
Tuesday
Mostly sunny, with a high near 13.
Tuesday Night
Mostly clear, with a low around 5.
Wednesday
A chance of snow after 1pm. Partly sunny, with a high near 30. Chance of precipitation is 30%.
Wednesday Night
A chance of snow. Mostly cloudy, with a low around 20. Chance of precipitation is 40%.
Thursday
A chance of snow before 1pm. Partly sunny, with a high near 25. Chance of precipitation is 30%.
Thursday Night
Partly cloudy, with a low around 9.
Friday
Partly sunny, with a high near 28.
Friday Night
A chance of snow. Mostly cloudy, with a low around 18. Chance of precipitation is 30%.
Saturday
A chance of snow. Mostly cloudy, with a high near 27. Chance of precipitation is 40%.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
6 Miles ESE Sinnamahoning PA
 41.35°N 77.94°W (Elev. 1998 ft)
Last Update:
1:11 am EST Jan 18, 2026
Forecast Valid:
1am EST Jan 18, 2026-6pm EST Jan 24, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

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Hourly Weather Forecast

National Digital Forecast Database

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation