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

63°F

17°C

Humidity 94%
Wind Speed Calm
Barometer 30.06 in
Dewpoint 61°F (16°C)
Visibility 10.00 mi
Last update 17 Aug 6:55 am EDT
Extended Forecast for

2 Miles ESE Byrnedale PA

  • Today

    Today: Showers and thunderstorms likely, then showers and possibly a thunderstorm after 3pm. High near 85. Calm wind becoming west around 6 mph in the afternoon. Chance of precipitation is 80%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    High: 85 °F

    Chance
    T-storms then
    Showers

  • Tonight

    Tonight: A chance of showers and thunderstorms before 9pm, then a slight chance of showers between 9pm and 10pm. Mostly cloudy, with a low around 56. Light northeast wind. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    Low: 56 °F

    Chance
    Showers then
    Mostly Cloudy

  • Monday

    Monday: A slight chance of showers after 2pm. Partly sunny, with a high near 78. Northeast wind around 5 mph. Chance of precipitation is 20%.

    High: 78 °F

    Partly Sunny
    then Slight
    Chance
    Showers

  • Monday Night

    Monday Night: A slight chance of showers. Mostly cloudy, with a low around 59. Light southeast wind. Chance of precipitation is 20%.

    Low: 59 °F

    Slight Chance
    Showers

  • Tuesday

    Tuesday: A chance of showers, mainly after 2pm. Mostly cloudy, with a high near 77. Southeast wind 3 to 6 mph. Chance of precipitation is 30%.

    High: 77 °F

    Chance
    Showers

  • Tuesday Night

    Tuesday Night: A chance of showers. Mostly cloudy, with a low around 61. Chance of precipitation is 40%. New precipitation amounts of less than a tenth of an inch possible.

    Low: 61 °F

    Chance
    Showers

  • Wednesday

    Wednesday: A chance of showers, then showers likely and possibly a thunderstorm after 2pm. Mostly cloudy, with a high near 78. Chance of precipitation is 70%.

    High: 78 °F

    Chance
    Showers then
    Showers
    Likely

  • Wednesday Night

    Wednesday Night: Showers likely and possibly a thunderstorm before 8pm, then a chance of showers between 8pm and 2am. Mostly cloudy, with a low around 60. Chance of precipitation is 60%.

    Low: 60 °F

    Showers
    Likely then
    Chance
    Showers

  • Thursday

    Thursday: A chance of showers and thunderstorms after 2pm. Partly sunny, with a high near 81. Chance of precipitation is 30%.

    High: 81 °F

    Partly Sunny
    then Chance
    T-storms

Detailed Forecast

Today
Showers and thunderstorms likely, then showers and possibly a thunderstorm after 3pm. High near 85. Calm wind becoming west around 6 mph in the afternoon. Chance of precipitation is 80%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Tonight
A chance of showers and thunderstorms before 9pm, then a slight chance of showers between 9pm and 10pm. Mostly cloudy, with a low around 56. Light northeast wind. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Monday
A slight chance of showers after 2pm. Partly sunny, with a high near 78. Northeast wind around 5 mph. Chance of precipitation is 20%.
Monday Night
A slight chance of showers. Mostly cloudy, with a low around 59. Light southeast wind. Chance of precipitation is 20%.
Tuesday
A chance of showers, mainly after 2pm. Mostly cloudy, with a high near 77. Southeast wind 3 to 6 mph. Chance of precipitation is 30%.
Tuesday Night
A chance of showers. Mostly cloudy, with a low around 61. Chance of precipitation is 40%. New precipitation amounts of less than a tenth of an inch possible.
Wednesday
A chance of showers, then showers likely and possibly a thunderstorm after 2pm. Mostly cloudy, with a high near 78. Chance of precipitation is 70%.
Wednesday Night
Showers likely and possibly a thunderstorm before 8pm, then a chance of showers between 8pm and 2am. Mostly cloudy, with a low around 60. Chance of precipitation is 60%.
Thursday
A chance of showers and thunderstorms after 2pm. Partly sunny, with a high near 81. Chance of precipitation is 30%.
Thursday Night
A chance of showers and thunderstorms before 8pm. Partly cloudy, with a low around 58. Chance of precipitation is 30%.
Friday
Mostly sunny, with a high near 84.
Friday Night
Mostly clear, with a low around 61.
Saturday
Mostly sunny, with a high near 83.
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ABOUT THIS FORECAST

 
Point Forecast:
2 Miles ESE Byrnedale PA
 41.31°N 78.45°W (Elev. 1634 ft)
Last Update:
6:48 am EDT Aug 17, 2025
Forecast Valid:
7am EDT Aug 17, 2025-6pm EDT Aug 23, 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