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Hazardous Weather Conditions

Current conditions at

St Marys Municipal Airport (KOYM)

Lat: 41.41°NLon: 78.5°WElev: 1934ft.

Overcast

21°F

-6°C

Humidity 74%
Wind Speed W 13 G 22 mph
Barometer 29.79 in
Dewpoint 14°F (-10°C)
Visibility 7.00 mi
Wind Chill8°F (-13°C)
Last update 30 Dec 8:15 pm EST
Extended Forecast for

4 Miles NW Sinnamahoning PA

Winter Weather Advisory December 31, 04:00pm until January 1, 04:00pm
Click here for hazard details and duration
Winter Weather Advisory

  • Tonight

    Tonight: Snow showers likely, mainly before 10pm. Cloudy, with a low around 17. West wind 10 to 14 mph, with gusts as high as 30 mph. Chance of precipitation is 60%. Total nighttime snow accumulation of less than a half inch possible.

    Low: 17 °F

    Snow Showers
    Likely

  • Wednesday

    Wednesday: Snow showers, mainly after 3pm. High near 26. West wind 8 to 13 mph, with gusts as high as 25 mph. Chance of precipitation is 80%. New snow accumulation of less than one inch possible.

    High: 26 °F

    Scattered
    Snow Showers
    then Snow
    Showers

  • Wednesday Night

    Wednesday Night: Snow showers, mainly before 1am. The snow could be heavy at times. Low around 14. West wind around 14 mph, with gusts as high as 26 mph. Chance of precipitation is 100%. New snow accumulation of 1 to 3 inches possible.

    Low: 14 °F

    Heavy Snow

  • New Year's Day

    New Year's Day: A chance of snow showers, mainly before 1pm. Partly sunny, with a high near 20. Wind chill values as low as zero. West wind 11 to 13 mph, with gusts as high as 25 mph. Chance of precipitation is 30%.

    High: 20 °F

    Chance Snow
    Showers

  • Thursday Night

    Thursday Night: A slight chance of snow showers. Mostly cloudy, with a low around 13. West wind around 9 mph, with gusts as high as 20 mph. Chance of precipitation is 20%.

    Low: 13 °F

    Slight Chance
    Snow Showers

  • Friday

    Friday: Mostly cloudy, with a high near 26.

    High: 26 °F

    Mostly Cloudy

  • Friday Night

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

    Low: 17 °F

    Mostly Cloudy

  • Saturday

    Saturday: Mostly cloudy, with a high near 26.

    High: 26 °F

    Mostly Cloudy

  • Saturday Night

    Saturday Night: Mostly cloudy, with a low around 16.

    Low: 16 °F

    Mostly Cloudy

Detailed Forecast

Tonight
Snow showers likely, mainly before 10pm. Cloudy, with a low around 17. West wind 10 to 14 mph, with gusts as high as 30 mph. Chance of precipitation is 60%. Total nighttime snow accumulation of less than a half inch possible.
Wednesday
Snow showers, mainly after 3pm. High near 26. West wind 8 to 13 mph, with gusts as high as 25 mph. Chance of precipitation is 80%. New snow accumulation of less than one inch possible.
Wednesday Night
Snow showers, mainly before 1am. The snow could be heavy at times. Low around 14. West wind around 14 mph, with gusts as high as 26 mph. Chance of precipitation is 100%. New snow accumulation of 1 to 3 inches possible.
New Year's Day
A chance of snow showers, mainly before 1pm. Partly sunny, with a high near 20. Wind chill values as low as zero. West wind 11 to 13 mph, with gusts as high as 25 mph. Chance of precipitation is 30%.
Thursday Night
A slight chance of snow showers. Mostly cloudy, with a low around 13. West wind around 9 mph, with gusts as high as 20 mph. Chance of precipitation is 20%.
Friday
Mostly cloudy, with a high near 26.
Friday Night
Mostly cloudy, with a low around 17.
Saturday
Mostly cloudy, with a high near 26.
Saturday Night
Mostly cloudy, with a low around 16.
Sunday
Mostly cloudy, with a high near 28.
Sunday Night
Mostly cloudy, with a low around 19.
Monday
A chance of snow showers. Mostly cloudy, with a high near 32. Chance of precipitation is 40%.
Monday Night
A chance of snow showers. Mostly cloudy, with a low around 21. Chance of precipitation is 30%.
Tuesday
Mostly cloudy, with a high near 31.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
4 Miles NW Sinnamahoning PA
 41.44°N 78.1°W (Elev. 1818 ft)
Last Update:
7:30 pm EST Dec 30, 2025
Forecast Valid:
8pm EST Dec 30, 2025-6pm EST Jan 6, 2026
 
Forecast Discussion
 
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Additional Resources

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Chance of Precipitation