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Hazardous Weather Conditions

Current conditions at

St Marys Municipal Airport (KOYM)

Lat: 41.41°NLon: 78.5°WElev: 1934ft.

Overcast

70°F

21°C

Humidity 94%
Wind Speed Calm
Barometer 30.10 in
Dewpoint 68°F (20°C)
Visibility 10.00 mi
Last update 14 Jul 3:55 am EDT
Extended Forecast for

3 Miles NW Sinnamahoning PA

  • Overnight

    Overnight: A slight chance of showers before 5am. Mostly cloudy, with a low around 66. Calm wind. Chance of precipitation is 20%.

    Low: 66 °F

    Slight Chance
    Showers

  • Monday

    Monday: A chance of showers and thunderstorms, mainly between 11am and 4pm. Some of the storms could produce heavy rainfall. Mostly cloudy, with a high near 80. Light and variable wind. Chance of precipitation is 50%. New rainfall amounts between a quarter and half of an inch possible.

    High: 80 °F

    Heavy Rain

  • Monday Night

    Monday Night: Increasing clouds, with a low around 66. Calm wind.

    Low: 66 °F

    Increasing
    Clouds

  • Tuesday

    Tuesday: A slight chance of showers and thunderstorms after 2pm. Mostly cloudy, then gradually becoming sunny, with a high near 85. Calm wind. Chance of precipitation is 20%.

    High: 85 °F

    Mostly Sunny
    then Slight
    Chance
    T-storms

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 68. Light southeast wind.

    Low: 68 °F

    Partly Cloudy

  • Wednesday

    Wednesday: A slight chance of showers and thunderstorms before 2pm, then showers likely and possibly a thunderstorm between 2pm and 5pm, then showers and thunderstorms likely after 5pm. Mostly cloudy, with a high near 83. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    High: 83 °F

    Slight Chance
    T-storms then
    T-storms
    Likely

  • Wednesday Night

    Wednesday Night: Showers and thunderstorms likely before 11pm, then a chance of showers between 11pm and 2am. Mostly cloudy, with a low around 69. Chance of precipitation is 60%.

    Low: 69 °F

    T-storms
    Likely then
    Chance
    Showers

  • Thursday

    Thursday: A chance of thunderstorms before 8am, then a chance of showers and thunderstorms between 8am and 2pm, then showers and possibly a thunderstorm after 2pm. High near 82. Chance of precipitation is 80%.

    High: 82 °F

    Chance
    T-storms then
    Showers

  • Thursday Night

    Thursday Night: Showers and possibly a thunderstorm before 8pm, then a chance of showers and thunderstorms between 8pm and 2am. Low around 68. Chance of precipitation is 80%.

    Low: 68 °F

    Showers then
    Chance
    T-storms

Detailed Forecast

Overnight
A slight chance of showers before 5am. Mostly cloudy, with a low around 66. Calm wind. Chance of precipitation is 20%.
Monday
A chance of showers and thunderstorms, mainly between 11am and 4pm. Some of the storms could produce heavy rainfall. Mostly cloudy, with a high near 80. Light and variable wind. Chance of precipitation is 50%. New rainfall amounts between a quarter and half of an inch possible.
Monday Night
Increasing clouds, with a low around 66. Calm wind.
Tuesday
A slight chance of showers and thunderstorms after 2pm. Mostly cloudy, then gradually becoming sunny, with a high near 85. Calm wind. Chance of precipitation is 20%.
Tuesday Night
Partly cloudy, with a low around 68. Light southeast wind.
Wednesday
A slight chance of showers and thunderstorms before 2pm, then showers likely and possibly a thunderstorm between 2pm and 5pm, then showers and thunderstorms likely after 5pm. Mostly cloudy, with a high near 83. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Wednesday Night
Showers and thunderstorms likely before 11pm, then a chance of showers between 11pm and 2am. Mostly cloudy, with a low around 69. Chance of precipitation is 60%.
Thursday
A chance of thunderstorms before 8am, then a chance of showers and thunderstorms between 8am and 2pm, then showers and possibly a thunderstorm after 2pm. High near 82. Chance of precipitation is 80%.
Thursday Night
Showers and possibly a thunderstorm before 8pm, then a chance of showers and thunderstorms between 8pm and 2am. Low around 68. Chance of precipitation is 80%.
Friday
A chance of showers and thunderstorms between 8am and 2pm, then showers likely and possibly a thunderstorm after 2pm. Mostly cloudy, with a high near 81. Chance of precipitation is 60%.
Friday Night
Showers likely. Mostly cloudy, with a low around 65. Chance of precipitation is 60%.
Saturday
A chance of showers. Partly sunny, with a high near 80. Chance of precipitation is 30%.
Saturday Night
A chance of showers. Partly cloudy, with a low around 64. Chance of precipitation is 30%.
Sunday
A chance of showers and thunderstorms. Partly sunny, with a high near 80. Chance of precipitation is 50%.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
3 Miles NW Sinnamahoning PA
 41.41°N 78.11°W (Elev. 2169 ft)
Last Update:
2:32 am EDT Jul 14, 2025
Forecast Valid:
4am EDT Jul 14, 2025-6pm EDT Jul 20, 2025
 
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