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.

Mostly Cloudy

73°F

23°C

Humidity 74%
Wind Speed Calm
Barometer 30.08 in
Dewpoint 64°F (18°C)
Visibility 10.00 mi
Last update 30 Jun 9:35 am EDT
Extended Forecast for

Saint Marys PA

  • Today

    Today: Showers and thunderstorms likely, mainly after 5pm. Mostly cloudy, with a high near 83. Calm wind becoming south around 6 mph in the afternoon. 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

  • Tonight

    Tonight: Showers and thunderstorms before 2am, then a chance of showers. Patchy fog between 10pm and 11pm. Low around 68. Calm wind becoming south around 5 mph after midnight. Chance of precipitation is 80%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    Low: 68 °F

    T-storms and
    Patchy Fog
    then Chance
    Showers

  • Tuesday

    Tuesday: Showers and possibly a thunderstorm. High near 77. Southwest wind 7 to 10 mph. Chance of precipitation is 80%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    High: 77 °F

    Showers

  • Tuesday Night

    Tuesday Night: Showers likely and possibly a thunderstorm before 8pm. Patchy fog after 11pm. Otherwise, mostly cloudy, then gradually becoming mostly clear, with a low around 60. West wind around 5 mph becoming calm in the evening. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    Low: 60 °F

    Showers
    Likely and
    Patchy Fog
    then Patchy
    Fog

  • Wednesday

    Wednesday: Sunny, with a high near 80. Northwest wind 5 to 7 mph.

    High: 80 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 59.

    Low: 59 °F

    Mostly Clear

  • Thursday

    Thursday: A chance of showers, with thunderstorms also possible after 2pm. Mostly sunny, with a high near 79. Chance of precipitation is 40%.

    High: 79 °F

    Chance
    Showers then
    Chance
    T-storms

  • Thursday Night

    Thursday Night: A chance of thunderstorms before 8pm. Mostly clear, with a low around 53. Chance of precipitation is 30%.

    Low: 53 °F

    Chance
    T-storms then
    Mostly Clear

  • Independence Day

    Independence Day: Sunny, with a high near 78.

    High: 78 °F

    Sunny

Detailed Forecast

Today
Showers and thunderstorms likely, mainly after 5pm. Mostly cloudy, with a high near 83. Calm wind becoming south around 6 mph in the afternoon. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Tonight
Showers and thunderstorms before 2am, then a chance of showers. Patchy fog between 10pm and 11pm. Low around 68. Calm wind becoming south around 5 mph after midnight. Chance of precipitation is 80%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Tuesday
Showers and possibly a thunderstorm. High near 77. Southwest wind 7 to 10 mph. Chance of precipitation is 80%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Tuesday Night
Showers likely and possibly a thunderstorm before 8pm. Patchy fog after 11pm. Otherwise, mostly cloudy, then gradually becoming mostly clear, with a low around 60. West wind around 5 mph becoming calm in the evening. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Wednesday
Sunny, with a high near 80. Northwest wind 5 to 7 mph.
Wednesday Night
Mostly clear, with a low around 59.
Thursday
A chance of showers, with thunderstorms also possible after 2pm. Mostly sunny, with a high near 79. Chance of precipitation is 40%.
Thursday Night
A chance of thunderstorms before 8pm. Mostly clear, with a low around 53. Chance of precipitation is 30%.
Independence Day
Sunny, with a high near 78.
Friday Night
Partly cloudy, with a low around 55.
Saturday
Mostly sunny, with a high near 83.
Saturday Night
Mostly cloudy, with a low around 64.
Sunday
A chance of showers and thunderstorms. Partly sunny, with a high near 84. Chance of precipitation is 40%.
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ABOUT THIS FORECAST

 
Point Forecast:
Saint Marys PA
 41.44°N 78.57°W (Elev. 1795 ft)
Last Update:
8:48 am EDT Jun 30, 2025
Forecast Valid:
9am EDT Jun 30, 2025-6pm EDT Jul 6, 2025
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation