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

10°F

-12°C

Humidity 79%
Wind Speed E 9 mph
Barometer 30.10 in
Dewpoint 5°F (-15°C)
Visibility 10.00 mi
Wind Chill-3°F (-19°C)
Last update 5 Dec 7:55 am EST
Extended Forecast for

3 Miles NW Sinnamahoning PA

  • Today

    Today: Mostly cloudy, with a high near 26. Wind chill values as low as zero. South wind around 7 mph.

    High: 26 °F

    Mostly Cloudy

  • Tonight

    Tonight: Mostly cloudy, with a low around 23. South wind around 7 mph.

    Low: 23 °F

    Mostly Cloudy

  • Saturday

    Saturday: Mostly cloudy, with a high near 35. Southwest wind around 8 mph, with gusts as high as 20 mph.

    High: 35 °F

    Mostly Cloudy

  • Saturday Night

    Saturday Night: Mostly cloudy, with a low around 24. West wind 5 to 8 mph.

    Low: 24 °F

    Mostly Cloudy

  • Sunday

    Sunday: Snow likely, mainly after 1pm. Mostly cloudy, with a high near 33. Southwest wind 3 to 6 mph. Chance of precipitation is 60%. New snow accumulation of less than one inch possible.

    High: 33 °F

    Slight Chance
    Snow then
    Snow Likely

  • Sunday Night

    Sunday Night: A chance of snow before 1am. Mostly cloudy, with a low around 16. Chance of precipitation is 40%.

    Low: 16 °F

    Chance Snow

  • Monday

    Monday: Mostly sunny, with a high near 22.

    High: 22 °F

    Mostly Sunny

  • Monday Night

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

    Low: 8 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Snow likely, mainly after 1pm. Mostly cloudy, with a high near 30. Chance of precipitation is 60%.

    High: 30 °F

    Chance Snow
    then Snow
    Likely

Detailed Forecast

Today
Mostly cloudy, with a high near 26. Wind chill values as low as zero. South wind around 7 mph.
Tonight
Mostly cloudy, with a low around 23. South wind around 7 mph.
Saturday
Mostly cloudy, with a high near 35. Southwest wind around 8 mph, with gusts as high as 20 mph.
Saturday Night
Mostly cloudy, with a low around 24. West wind 5 to 8 mph.
Sunday
Snow likely, mainly after 1pm. Mostly cloudy, with a high near 33. Southwest wind 3 to 6 mph. Chance of precipitation is 60%. New snow accumulation of less than one inch possible.
Sunday Night
A chance of snow before 1am. Mostly cloudy, with a low around 16. Chance of precipitation is 40%.
Monday
Mostly sunny, with a high near 22.
Monday Night
Partly cloudy, with a low around 8.
Tuesday
Snow likely, mainly after 1pm. Mostly cloudy, with a high near 30. Chance of precipitation is 60%.
Tuesday Night
A chance of snow. Cloudy, with a low around 25. Chance of precipitation is 50%.
Wednesday
Snow. High near 37. Chance of precipitation is 80%.
Wednesday Night
Rain and snow. Low around 27. Chance of precipitation is 90%.
Thursday
Snow likely. Mostly cloudy, with a high near 31. Chance of precipitation is 60%.
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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:
7:36 am EST Dec 5, 2025
Forecast Valid:
8am EST Dec 5, 2025-6pm EST Dec 11, 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