National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Hazardous Weather Conditions

Current conditions at

St Marys Municipal Airport (KOYM)

Lat: 41.41°NLon: 78.5°WElev: 1934ft.

Overcast

25°C

77°F

Humidity 79%
Wind Speed SE 6 km/h
Barometer 30.10 in
Dewpoint 21°C (70°F)
Visibility 16 km
Heat Index26°C (79°F)
Last update 12 Jul 11:15 pm EDT
Extended Forecast for

4 Miles SE Sinnamahoning PA

  • Tonight

    Tonight: A chance of showers and thunderstorms before 2am, then a slight chance of showers after 3am. Mostly cloudy, with a low around 21. South wind 8 to 10 km/h. Chance of precipitation is 30%. New rainfall amounts of less than 1 mm, except higher amounts possible in thunderstorms.

    Low: 21 °C

    Chance
    T-storms

  • Sunday

    Sunday: Showers and thunderstorms, mainly after 2pm. High near 29. South wind 8 to 10 km/h. Chance of precipitation is 80%. New rainfall amounts between 7.5 mm and 1 cm possible.

    High: 29 °C

    Slight Chance
    Showers then
    T-storms

  • Sunday Night

    Sunday Night: Showers and thunderstorms likely before 8pm, then showers likely and possibly a thunderstorm between 8pm and 2am, then a slight chance of showers after 2am. Mostly cloudy, with a low around 19. Calm wind. Chance of precipitation is 60%. New rainfall amounts between 2 and 3 cm possible.

    Low: 19 °C

    T-storms
    Likely then
    Showers
    Likely

  • Monday

    Monday: Mostly sunny, with a high near 29. West wind 5 to 8 km/h.

    High: 29 °C

    Mostly Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 17. Calm wind.

    Low: 17 °C

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 31.

    High: 31 °C

    Sunny

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 19.

    Low: 19 °C

    Partly Cloudy

  • Wednesday

    Wednesday: A chance of showers and thunderstorms after 2pm. Mostly sunny, with a high near 29. Chance of precipitation is 40%.

    High: 29 °C

    Mostly Sunny
    then Chance
    T-storms

  • Wednesday Night

    Wednesday Night: A chance of showers and thunderstorms before 8pm, then a chance of showers between 8pm and 2am. Mostly cloudy, with a low around 21. Chance of precipitation is 30%.

    Low: 21 °C

    Chance
    T-storms then
    Chance
    Showers

Detailed Forecast

Tonight
A chance of showers and thunderstorms before 2am, then a slight chance of showers after 3am. Mostly cloudy, with a low around 21. South wind 8 to 10 km/h. Chance of precipitation is 30%. New rainfall amounts of less than 1 mm, except higher amounts possible in thunderstorms.
Sunday
Showers and thunderstorms, mainly after 2pm. High near 29. South wind 8 to 10 km/h. Chance of precipitation is 80%. New rainfall amounts between 7.5 mm and 1 cm possible.
Sunday Night
Showers and thunderstorms likely before 8pm, then showers likely and possibly a thunderstorm between 8pm and 2am, then a slight chance of showers after 2am. Mostly cloudy, with a low around 19. Calm wind. Chance of precipitation is 60%. New rainfall amounts between 2 and 3 cm possible.
Monday
Mostly sunny, with a high near 29. West wind 5 to 8 km/h.
Monday Night
Mostly clear, with a low around 17. Calm wind.
Tuesday
Sunny, with a high near 31.
Tuesday Night
Partly cloudy, with a low around 19.
Wednesday
A chance of showers and thunderstorms after 2pm. Mostly sunny, with a high near 29. Chance of precipitation is 40%.
Wednesday Night
A chance of showers and thunderstorms before 8pm, then a chance of showers between 8pm and 2am. Mostly cloudy, with a low around 21. Chance of precipitation is 30%.
Thursday
Showers likely and possibly a thunderstorm, mainly after 2pm. Mostly cloudy, with a high near 28. Chance of precipitation is 70%.
Thursday Night
Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 20. Chance of precipitation is 60%.
Friday
Showers likely and possibly a thunderstorm. Partly sunny, with a high near 28. Chance of precipitation is 60%.
Friday Night
Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 18. Chance of precipitation is 60%.
Saturday
A chance of showers. Partly sunny, with a high near 28. Chance of precipitation is 30%.
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ABOUT THIS FORECAST

 
Point Forecast:
4 Miles SE Sinnamahoning PA
 41.34°N 78°W (Elev. 1906 m)
Last Update:
10:52 pm EDT Jul 12, 2025
Forecast Valid:
11pm EDT Jul 12, 2025-6pm EDT Jul 19, 2025
 
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