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

23°F

-5°C

Humidity 86%
Wind Speed Calm
Barometer 30.12 in
Dewpoint 19°F (-7°C)
Visibility 10.00 mi
Last update 5 Jan 2:15 am EST
Extended Forecast for

3 Miles ENE Penfield PA

  • Overnight

    Overnight: A slight chance of snow showers after 4am. Cloudy, with a low around 18. Calm wind. Chance of precipitation is 20%.

    Low: 18 °F

    Slight Chance
    Snow Showers

  • Monday

    Monday: A slight chance of snow showers before 8am. Mostly cloudy, with a high near 40. Light and variable wind becoming south around 6 mph in the afternoon. Chance of precipitation is 20%.

    High: 40 °F

    Slight Chance
    Snow Showers
    then Partly
    Sunny

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 28. Calm wind.

    Low: 28 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: A slight chance of rain or freezing rain before 10am, then rain. High near 47. Calm wind becoming south around 6 mph in the afternoon. Chance of precipitation is 90%. New precipitation amounts of less than a tenth of an inch possible.

    High: 47 °F

    Chance
    Rain/Freezing
    Rain then
    Rain

  • Tuesday Night

    Tuesday Night: Rain before 7pm, then showers, mainly between 7pm and 1am. Low around 34. South wind 6 to 9 mph becoming west after midnight. Winds could gust as high as 21 mph. Chance of precipitation is 80%. New precipitation amounts of less than a tenth of an inch possible.

    Low: 34 °F

    Rain

  • Wednesday

    Wednesday: Mostly cloudy, with a high near 41.

    High: 41 °F

    Mostly Cloudy

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 31.

    Low: 31 °F

    Mostly Cloudy

  • Thursday

    Thursday: Partly sunny, with a high near 50.

    High: 50 °F

    Partly Sunny

  • Thursday Night

    Thursday Night: Showers likely, mainly after 1am. Mostly cloudy, with a low around 38. Chance of precipitation is 70%.

    Low: 38 °F

    Showers
    Likely

Detailed Forecast

Overnight
A slight chance of snow showers after 4am. Cloudy, with a low around 18. Calm wind. Chance of precipitation is 20%.
Monday
A slight chance of snow showers before 8am. Mostly cloudy, with a high near 40. Light and variable wind becoming south around 6 mph in the afternoon. Chance of precipitation is 20%.
Monday Night
Mostly cloudy, with a low around 28. Calm wind.
Tuesday
A slight chance of rain or freezing rain before 10am, then rain. High near 47. Calm wind becoming south around 6 mph in the afternoon. Chance of precipitation is 90%. New precipitation amounts of less than a tenth of an inch possible.
Tuesday Night
Rain before 7pm, then showers, mainly between 7pm and 1am. Low around 34. South wind 6 to 9 mph becoming west after midnight. Winds could gust as high as 21 mph. Chance of precipitation is 80%. New precipitation amounts of less than a tenth of an inch possible.
Wednesday
Mostly cloudy, with a high near 41.
Wednesday Night
Mostly cloudy, with a low around 31.
Thursday
Partly sunny, with a high near 50.
Thursday Night
Showers likely, mainly after 1am. Mostly cloudy, with a low around 38. Chance of precipitation is 70%.
Friday
Showers. High near 54. Chance of precipitation is 80%.
Friday Night
Showers. Low around 43. Chance of precipitation is 80%.
Saturday
Showers likely. Mostly cloudy, with a high near 52. Chance of precipitation is 70%.
Saturday Night
A chance of rain and snow showers. Mostly cloudy, with a low around 26. Chance of precipitation is 40%.
Sunday
A chance of snow showers. Partly sunny, with a high near 33. Chance of precipitation is 30%.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
3 Miles ENE Penfield PA
 41.23°N 78.55°W (Elev. 1299 ft)
Last Update:
1:36 am EST Jan 5, 2026
Forecast Valid:
2am EST Jan 5, 2026-6pm EST Jan 11, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

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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