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 2:55 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:
3am EST Jan 5, 2026-6pm EST Jan 11, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

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