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Hazardous Weather Conditions

Current conditions at

St Marys Municipal Airport (KOYM)

Lat: 41.41°NLon: 78.5°WElev: 1934ft.

Fair

9°F

-13°C

Humidity 56%
Wind Speed Calm
Barometer 30.31 in
Dewpoint -4°F (-20°C)
Visibility 10.00 mi
Last update 20 Jan 7:35 pm EST
Extended Forecast for

3 Miles NW Sinnamahoning PA

Winter Weather Advisory January 21, 12:00pm until January 22, 10:00am
Click here for hazard details and duration
Winter Weather Advisory

  • Tonight

    Tonight: Mostly clear, with a low around 7. Wind chill values as low as -5. West wind 7 to 9 mph.

    Low: 7 °F

    Mostly Clear

  • Wednesday

    Wednesday: Snow, mainly after 1pm. High near 31. Wind chill values as low as -5. South wind 8 to 11 mph, with gusts as high as 25 mph. Chance of precipitation is 80%. New snow accumulation of 1 to 3 inches possible.

    High: 31 °F

    Slight Chance
    Snow then
    Snow

  • Wednesday Night

    Wednesday Night: Snow. Low around 25. Southwest wind 11 to 14 mph, with gusts as high as 28 mph. Chance of precipitation is 80%. New snow accumulation of 1 to 2 inches possible.

    Low: 25 °F

    Snow

  • Thursday

    Thursday: Partly sunny, with a high near 30. West wind around 14 mph, with gusts as high as 31 mph.

    High: 30 °F

    Partly Sunny

  • Thursday Night

    Thursday Night: Mostly cloudy, with a low around 11. West wind 11 to 13 mph, with gusts as high as 24 mph.

    Low: 11 °F

    Mostly Cloudy

  • Friday

    Friday: Partly sunny, with a high near 15.

    High: 15 °F

    Partly Sunny

  • Friday Night

    Friday Night: Mostly cloudy, with a low around -2.

    Low: -2 °F

    Mostly Cloudy

  • Saturday

    Saturday: Partly sunny and cold, with a high near 9.

    High: 9 °F

    Cold

  • Saturday Night

    Saturday Night: A chance of snow. Mostly cloudy, with a low around 4. Chance of precipitation is 50%.

    Low: 4 °F

    Chance Snow

Detailed Forecast

Tonight
Mostly clear, with a low around 7. Wind chill values as low as -5. West wind 7 to 9 mph.
Wednesday
Snow, mainly after 1pm. High near 31. Wind chill values as low as -5. South wind 8 to 11 mph, with gusts as high as 25 mph. Chance of precipitation is 80%. New snow accumulation of 1 to 3 inches possible.
Wednesday Night
Snow. Low around 25. Southwest wind 11 to 14 mph, with gusts as high as 28 mph. Chance of precipitation is 80%. New snow accumulation of 1 to 2 inches possible.
Thursday
Partly sunny, with a high near 30. West wind around 14 mph, with gusts as high as 31 mph.
Thursday Night
Mostly cloudy, with a low around 11. West wind 11 to 13 mph, with gusts as high as 24 mph.
Friday
Partly sunny, with a high near 15.
Friday Night
Mostly cloudy, with a low around -2.
Saturday
Partly sunny and cold, with a high near 9.
Saturday Night
A chance of snow. Mostly cloudy, with a low around 4. Chance of precipitation is 50%.
Sunday
A chance of snow. Mostly cloudy, with a high near 14. Chance of precipitation is 50%.
Sunday Night
A chance of snow. Mostly cloudy, with a low around 3. Chance of precipitation is 40%.
Monday
Partly sunny, with a high near 16.
Monday Night
Mostly cloudy, with a low around 5.
Tuesday
Partly sunny, with a high near 18.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
3 Miles NW Sinnamahoning PA
 41.41°N 78.11°W (Elev. 2169 ft)
Last Update:
7:06 pm EST Jan 20, 2026
Forecast Valid:
7pm EST Jan 20, 2026-6pm EST Jan 27, 2026
 
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