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

43°F

6°C

Humidity 76%
Wind Speed NW 7 mph
Barometer 30.17 in
Dewpoint 36°F (2°C)
Visibility 10.00 mi
Wind Chill39°F (4°C)
Last update 9 Jan 9:35 pm EST
Extended Forecast for

2 Miles ESE Byrnedale PA

  • Tonight

    Tonight: Patchy fog after 4am. Otherwise, cloudy, with a low around 32. West wind 5 to 8 mph becoming calm after midnight. Winds could gust as high as 30 mph.

    Low: 32 °F

    Cloudy then
    Patchy Fog

  • Saturday

    Saturday: Rain, mainly after 1pm. Patchy fog before 9am. High near 43. Calm wind becoming southeast around 6 mph in the afternoon. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.

    High: 43 °F

    Slight Chance
    Rain and
    Patchy Fog
    then Rain

  • Saturday Night

    Saturday Night: Rain before 1am, then a slight chance of rain and snow showers between 1am and 4am, then a slight chance of snow showers after 4am. Patchy fog before 10pm. Low around 28. South wind 5 to 10 mph becoming west after midnight. Winds could gust as high as 23 mph. Chance of precipitation is 90%. Little or no snow accumulation expected.

    Low: 28 °F

    Rain and
    Patchy Fog
    then
    Rain/Snow

  • Sunday

    Sunday: Snow showers likely, mainly after 1pm. Partly sunny, with a high near 31. West wind 10 to 14 mph, with gusts as high as 34 mph. Chance of precipitation is 70%. New snow accumulation of less than a half inch possible.

    High: 31 °F

    Chance Snow
    Showers then
    Snow Showers
    Likely

  • Sunday Night

    Sunday Night: A slight chance of snow showers before 1am. Mostly cloudy, with a low around 23. West wind 10 to 14 mph, with gusts as high as 36 mph. Chance of precipitation is 20%.

    Low: 23 °F

    Slight Chance
    Snow Showers

  • Monday

    Monday: Partly sunny, with a high near 33.

    High: 33 °F

    Partly Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 26.

    Low: 26 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Partly sunny, with a high near 40.

    High: 40 °F

    Partly Sunny

  • Tuesday Night

    Tuesday Night: A chance of rain after 1am. Mostly cloudy, with a low around 33. Chance of precipitation is 40%.

    Low: 33 °F

    Mostly Cloudy
    then Chance
    Rain

Detailed Forecast

Tonight
Patchy fog after 4am. Otherwise, cloudy, with a low around 32. West wind 5 to 8 mph becoming calm after midnight. Winds could gust as high as 30 mph.
Saturday
Rain, mainly after 1pm. Patchy fog before 9am. High near 43. Calm wind becoming southeast around 6 mph in the afternoon. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.
Saturday Night
Rain before 1am, then a slight chance of rain and snow showers between 1am and 4am, then a slight chance of snow showers after 4am. Patchy fog before 10pm. Low around 28. South wind 5 to 10 mph becoming west after midnight. Winds could gust as high as 23 mph. Chance of precipitation is 90%. Little or no snow accumulation expected.
Sunday
Snow showers likely, mainly after 1pm. Partly sunny, with a high near 31. West wind 10 to 14 mph, with gusts as high as 34 mph. Chance of precipitation is 70%. New snow accumulation of less than a half inch possible.
Sunday Night
A slight chance of snow showers before 1am. Mostly cloudy, with a low around 23. West wind 10 to 14 mph, with gusts as high as 36 mph. Chance of precipitation is 20%.
Monday
Partly sunny, with a high near 33.
Monday Night
Partly cloudy, with a low around 26.
Tuesday
Partly sunny, with a high near 40.
Tuesday Night
A chance of rain after 1am. Mostly cloudy, with a low around 33. Chance of precipitation is 40%.
Wednesday
Rain likely, mainly after 1pm. Mostly cloudy, with a high near 39. Chance of precipitation is 60%.
Wednesday Night
A chance of snow. Mostly cloudy, with a low around 21. Chance of precipitation is 40%.
Thursday
A chance of snow. Partly sunny, with a high near 26. Chance of precipitation is 30%.
Thursday Night
Mostly cloudy, with a low around 14.
Friday
A chance of snow. Partly sunny, with a high near 27. Chance of precipitation is 30%.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
2 Miles ESE Byrnedale PA
 41.31°N 78.45°W (Elev. 1634 ft)
Last Update:
9:51 pm EST Jan 9, 2026
Forecast Valid:
9pm EST Jan 9, 2026-6pm EST Jan 16, 2026
 
Forecast Discussion
 
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Additional Resources

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Chance of Precipitation