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

32°F

0°C

Humidity 80%
Wind Speed W 8 mph
Barometer 29.83 in
Dewpoint 27°F (-3°C)
Visibility 10.00 mi
Wind Chill25°F (-4°C)
Last update 6 Dec 2:35 pm EST
Extended Forecast for

Saint Marys PA

  • This Afternoon

    This Afternoon: A slight chance of snow after 3pm. Mostly cloudy, with a high near 34. West wind 8 to 10 mph, with gusts as high as 21 mph. Chance of precipitation is 20%.

    High: 34 °F

    Slight Chance
    Snow

  • Tonight

    Tonight: Mostly cloudy, with a low around 22. West wind around 6 mph becoming calm in the evening.

    Low: 22 °F

    Mostly Cloudy

  • Sunday

    Sunday: A chance of snow, mainly after 4pm. Mostly cloudy, with a high near 33. Calm wind becoming southwest 5 to 8 mph in the morning. Chance of precipitation is 30%.

    High: 33 °F

    Mostly Cloudy
    then Chance
    Snow

  • Sunday Night

    Sunday Night: A chance of snow before 1am. Mostly cloudy, with a low around 12. West wind around 6 mph becoming north after midnight. Chance of precipitation is 30%.

    Low: 12 °F

    Chance Snow

  • Monday

    Monday: Mostly sunny, with a high near 23. North wind 3 to 6 mph.

    High: 23 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 6.

    Low: 6 °F

    Partly Cloudy

  • Tuesday

    Tuesday: A chance of snow after 1pm. Mostly cloudy, with a high near 31. Chance of precipitation is 40%.

    High: 31 °F

    Mostly Cloudy
    then Chance
    Snow

  • Tuesday Night

    Tuesday Night: Snow likely, mainly after 1am. Cloudy, with a low around 26. Chance of precipitation is 70%.

    Low: 26 °F

    Chance Snow
    then Snow
    Likely

  • Wednesday

    Wednesday: Rain and snow. High near 38. Chance of precipitation is 90%.

    High: 38 °F

    Rain/Snow

Detailed Forecast

This Afternoon
A slight chance of snow after 3pm. Mostly cloudy, with a high near 34. West wind 8 to 10 mph, with gusts as high as 21 mph. Chance of precipitation is 20%.
Tonight
Mostly cloudy, with a low around 22. West wind around 6 mph becoming calm in the evening.
Sunday
A chance of snow, mainly after 4pm. Mostly cloudy, with a high near 33. Calm wind becoming southwest 5 to 8 mph in the morning. Chance of precipitation is 30%.
Sunday Night
A chance of snow before 1am. Mostly cloudy, with a low around 12. West wind around 6 mph becoming north after midnight. Chance of precipitation is 30%.
Monday
Mostly sunny, with a high near 23. North wind 3 to 6 mph.
Monday Night
Partly cloudy, with a low around 6.
Tuesday
A chance of snow after 1pm. Mostly cloudy, with a high near 31. Chance of precipitation is 40%.
Tuesday Night
Snow likely, mainly after 1am. Cloudy, with a low around 26. Chance of precipitation is 70%.
Wednesday
Rain and snow. High near 38. Chance of precipitation is 90%.
Wednesday Night
Snow. Low around 24. Chance of precipitation is 90%.
Thursday
Snow likely. Mostly cloudy, with a high near 31. Chance of precipitation is 60%.
Thursday Night
Snow likely. Mostly cloudy, with a low around 19. Chance of precipitation is 60%.
Friday
Snow likely. Mostly cloudy, with a high near 29. Chance of precipitation is 60%.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Saint Marys PA
 41.44°N 78.57°W (Elev. 1795 ft)
Last Update:
1:37 pm EST Dec 6, 2025
Forecast Valid:
2pm EST Dec 6, 2025-6pm EST Dec 12, 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