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

39°F

4°C

Humidity 75%
Wind Speed Calm
Barometer 30.15 in
Dewpoint 32°F (0°C)
Visibility 10.00 mi
Last update 16 Oct 11:35 pm EDT
Extended Forecast for

3 Miles E Sinnamahoning PA

  • Tonight

    Tonight: Areas of frost after 2am. Otherwise, mostly clear, with a low around 33. Northwest wind 3 to 5 mph.

    Low: 33 °F

    Areas Frost

  • Friday

    Friday: Widespread frost, mainly before 9am. Otherwise, sunny, with a high near 60. Northwest wind 3 to 5 mph.

    High: 60 °F

    Frost then
    Mostly Sunny

  • Friday Night

    Friday Night: A slight chance of showers after 2am. Increasing clouds, with a low around 43. Calm wind. Chance of precipitation is 20%.

    Low: 43 °F

    Partly Cloudy
    then Slight
    Chance
    Showers

  • Saturday

    Saturday: Partly sunny, with a high near 67. Calm wind becoming south around 6 mph in the afternoon.

    High: 67 °F

    Partly Sunny

  • Saturday Night

    Saturday Night: A chance of showers after 2am. Partly cloudy, with a low around 50. Southeast wind around 6 mph. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch possible.

    Low: 50 °F

    Partly Cloudy
    then Chance
    Showers

  • Sunday

    Sunday: A chance of showers, then showers and possibly a thunderstorm after 2pm. High near 67. Chance of precipitation is 80%. New rainfall amounts between a quarter and half of an inch possible.

    High: 67 °F

    Chance
    Showers then
    Showers

  • Sunday Night

    Sunday Night: Showers and possibly a thunderstorm. Low around 45. Chance of precipitation is 80%.

    Low: 45 °F

    Showers

  • Monday

    Monday: Showers likely, mainly before 8am. Partly sunny, with a high near 58. Chance of precipitation is 60%.

    High: 58 °F

    Showers
    Likely

  • Monday Night

    Monday Night: Partly cloudy, with a low around 41.

    Low: 41 °F

    Partly Cloudy

Detailed Forecast

Tonight
Areas of frost after 2am. Otherwise, mostly clear, with a low around 33. Northwest wind 3 to 5 mph.
Friday
Widespread frost, mainly before 9am. Otherwise, sunny, with a high near 60. Northwest wind 3 to 5 mph.
Friday Night
A slight chance of showers after 2am. Increasing clouds, with a low around 43. Calm wind. Chance of precipitation is 20%.
Saturday
Partly sunny, with a high near 67. Calm wind becoming south around 6 mph in the afternoon.
Saturday Night
A chance of showers after 2am. Partly cloudy, with a low around 50. Southeast wind around 6 mph. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch possible.
Sunday
A chance of showers, then showers and possibly a thunderstorm after 2pm. High near 67. Chance of precipitation is 80%. New rainfall amounts between a quarter and half of an inch possible.
Sunday Night
Showers and possibly a thunderstorm. Low around 45. Chance of precipitation is 80%.
Monday
Showers likely, mainly before 8am. Partly sunny, with a high near 58. Chance of precipitation is 60%.
Monday Night
Partly cloudy, with a low around 41.
Tuesday
A chance of showers after 2pm. Partly sunny, with a high near 62. Chance of precipitation is 50%.
Tuesday Night
Showers likely. Mostly cloudy, with a low around 42. Chance of precipitation is 60%.
Wednesday
A chance of showers. Mostly cloudy, with a high near 52. Chance of precipitation is 40%.
Wednesday Night
A chance of showers. Mostly cloudy, with a low around 39. Chance of precipitation is 30%.
Thursday
A chance of showers. Mostly cloudy, with a high near 53. Chance of precipitation is 30%.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
3 Miles E Sinnamahoning PA
 41.38°N 78°W (Elev. 1988 ft)
Last Update:
8:06 pm EDT Oct 16, 2025
Forecast Valid:
11pm EDT Oct 16, 2025-6pm EDT Oct 23, 2025
 
Forecast Discussion
 
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Additional Resources

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Chance of Precipitation