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 1:35 am EST
Extended Forecast for

3 Miles E Sinnamahoning PA

  • Overnight

    Overnight: Cloudy, with a low around 18. Calm wind.

    Low: 18 °F

    Cloudy

  • Monday

    Monday: A slight chance of snow showers between 7am and 8am. Mostly cloudy, with a high near 35. South wind 3 to 6 mph. Chance of precipitation is 20%.

    High: 35 °F

    Slight Chance
    Snow Showers
    then Partly
    Sunny

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 26. Light west wind.

    Low: 26 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: A slight chance of snow and freezing rain before 11am, then rain. High near 44. Calm wind becoming south around 6 mph in the afternoon. Chance of precipitation is 90%. Little or no snow accumulation expected.

    High: 44 °F

    Slight Chance
    Wintry Mix
    then Rain

  • Tuesday Night

    Tuesday Night: Rain before 7pm, then showers, mainly between 7pm and 1am. Low around 35. South wind 6 to 10 mph becoming west after midnight. Winds could gust as high as 25 mph. Chance of precipitation is 80%. New precipitation amounts of less than a tenth of an inch possible.

    Low: 35 °F

    Rain

  • Wednesday

    Wednesday: Mostly cloudy, with a high near 40.

    High: 40 °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 47.

    High: 47 °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
Cloudy, with a low around 18. Calm wind.
Monday
A slight chance of snow showers between 7am and 8am. Mostly cloudy, with a high near 35. South wind 3 to 6 mph. Chance of precipitation is 20%.
Monday Night
Mostly cloudy, with a low around 26. Light west wind.
Tuesday
A slight chance of snow and freezing rain before 11am, then rain. High near 44. Calm wind becoming south around 6 mph in the afternoon. Chance of precipitation is 90%. Little or no snow accumulation expected.
Tuesday Night
Rain before 7pm, then showers, mainly between 7pm and 1am. Low around 35. South wind 6 to 10 mph becoming west after midnight. Winds could gust as high as 25 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 40.
Wednesday Night
Mostly cloudy, with a low around 31.
Thursday
Partly sunny, with a high near 47.
Thursday Night
Showers likely, mainly after 1am. Mostly cloudy, with a low around 38. Chance of precipitation is 70%.
Friday
Showers. High near 50. 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 51. Chance of precipitation is 70%.
Saturday Night
A chance of showers. Mostly cloudy, with a low around 28. Chance of precipitation is 30%.
Sunday
Partly sunny, with a high near 32.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
3 Miles E Sinnamahoning PA
 41.38°N 78°W (Elev. 1988 ft)
Last Update:
1:36 am EST Jan 5, 2026
Forecast Valid:
1am 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