National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Hazardous Weather Conditions

Current conditions at

St Marys Municipal Airport (KOYM)

Lat: 41.41°NLon: 78.5°WElev: 1934ft.

Overcast

32°F

0°C

Humidity 64%
Wind Speed SE 7 mph
Barometer 30.30 in
Dewpoint 21°F (-6°C)
Visibility 10.00 mi
Wind Chill25°F (-4°C)
Last update 29 Nov 9:15 pm EST
Extended Forecast for

3 Miles NW Sinnamahoning PA

  • Tonight

    Tonight: Snow likely, mainly after 1am. Cloudy, with a low around 27. South wind 8 to 15 mph, with gusts as high as 26 mph. Chance of precipitation is 70%. Total nighttime snow accumulation of less than a half inch possible.

    Low: 27 °F

    Slight Chance
    Snow then
    Snow Likely

  • Sunday

    Sunday: Snow showers likely, possibly mixing with rain after 2pm, then gradually ending. The snow could be heavy at times. Cloudy, with a high near 38. South wind 10 to 15 mph becoming southwest in the afternoon. Winds could gust as high as 28 mph. Chance of precipitation is 70%. New snow accumulation of less than one inch possible.

    High: 38 °F

    Heavy Snow
    then Chance
    Rain/Snow

  • Sunday Night

    Sunday Night: A chance of snow showers after 7pm. Mostly cloudy, with a low around 24. West wind around 14 mph, with gusts as high as 28 mph. Chance of precipitation is 40%.

    Low: 24 °F

    Chance Snow
    Showers

  • Monday

    Monday: Partly sunny, with a high near 32. Northwest wind 5 to 9 mph becoming calm in the afternoon. Winds could gust as high as 20 mph.

    High: 32 °F

    Partly Sunny

  • Monday Night

    Monday Night: Snow likely after 1am. Mostly cloudy, with a low around 23. Calm wind becoming southeast 5 to 8 mph in the evening. Chance of precipitation is 60%. New snow accumulation of 1 to 3 inches possible.

    Low: 23 °F

    Mostly Cloudy
    then Snow
    Likely

  • Tuesday

    Tuesday: Snow, mainly before 1pm. High near 33. Chance of precipitation is 80%. New snow accumulation of 2 to 4 inches possible.

    High: 33 °F

    Snow

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 21.

    Low: 21 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Mostly cloudy, with a high near 32.

    High: 32 °F

    Mostly Cloudy

  • Wednesday Night

    Wednesday Night: A chance of snow after 1am. Mostly cloudy, with a low around 24. Chance of precipitation is 30%.

    Low: 24 °F

    Mostly Cloudy
    then Chance
    Snow

Detailed Forecast

Tonight
Snow likely, mainly after 1am. Cloudy, with a low around 27. South wind 8 to 15 mph, with gusts as high as 26 mph. Chance of precipitation is 70%. Total nighttime snow accumulation of less than a half inch possible.
Sunday
Snow showers likely, possibly mixing with rain after 2pm, then gradually ending. The snow could be heavy at times. Cloudy, with a high near 38. South wind 10 to 15 mph becoming southwest in the afternoon. Winds could gust as high as 28 mph. Chance of precipitation is 70%. New snow accumulation of less than one inch possible.
Sunday Night
A chance of snow showers after 7pm. Mostly cloudy, with a low around 24. West wind around 14 mph, with gusts as high as 28 mph. Chance of precipitation is 40%.
Monday
Partly sunny, with a high near 32. Northwest wind 5 to 9 mph becoming calm in the afternoon. Winds could gust as high as 20 mph.
Monday Night
Snow likely after 1am. Mostly cloudy, with a low around 23. Calm wind becoming southeast 5 to 8 mph in the evening. Chance of precipitation is 60%. New snow accumulation of 1 to 3 inches possible.
Tuesday
Snow, mainly before 1pm. High near 33. Chance of precipitation is 80%. New snow accumulation of 2 to 4 inches possible.
Tuesday Night
Mostly cloudy, with a low around 21.
Wednesday
Mostly cloudy, with a high near 32.
Wednesday Night
A chance of snow after 1am. Mostly cloudy, with a low around 24. Chance of precipitation is 30%.
Thursday
A chance of snow before 1pm. Mostly cloudy, with a high near 30. Chance of precipitation is 30%.
Thursday Night
Mostly cloudy, with a low around 16.
Friday
A chance of snow. Mostly cloudy, with a high near 28. Chance of precipitation is 30%.
Friday Night
A chance of snow. Mostly cloudy, with a low around 20. Chance of precipitation is 50%.
Saturday
A chance of snow. Mostly cloudy, with a high near 30. Chance of precipitation is 50%.
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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:
7:05 pm EST Nov 29, 2025
Forecast Valid:
9pm EST Nov 29, 2025-6pm EST Dec 6, 2025
 
Forecast Discussion
 
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Additional Resources

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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