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

64°F

18°C

Humidity 94%
Wind Speed S 3 mph
Barometer 30.15 in
Dewpoint 63°F (17°C)
Visibility 2.00 mi
Last update 28 Jun 12:15 am EDT
Extended Forecast for

Saint Marys PA

  • Overnight

    Overnight: A chance of showers and thunderstorms, mainly before 5am. Mostly cloudy, with a low around 65. South wind around 6 mph. Chance of precipitation is 30%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    Low: 65 °F

    Chance
    Showers

  • Saturday

    Saturday: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1pm. Mostly cloudy, with a high near 80. West wind 6 to 10 mph, with gusts as high as 20 mph. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    High: 80 °F

    Chance
    T-storms then
    Showers
    Likely

  • Saturday Night

    Saturday Night: Patchy dense fog after 2am. Otherwise, partly cloudy, with a low around 58. West wind around 5 mph becoming calm in the evening.

    Low: 58 °F

    Mostly Cloudy
    then Patchy
    Dense Fog

  • Sunday

    Sunday: Patchy fog before 8am. Otherwise, sunny, with a high near 84. Calm wind becoming west around 5 mph in the afternoon.

    High: 84 °F

    Patchy Fog
    then Sunny

  • Sunday Night

    Sunday Night: Patchy fog after 3am. Otherwise, partly cloudy, with a low around 62. Calm wind.

    Low: 62 °F

    Mostly Clear
    then Patchy
    Fog

  • Monday

    Monday: A chance of showers before 11am, then a chance of showers and thunderstorms between 11am and 2pm, then showers likely and possibly a thunderstorm after 2pm. Patchy fog between 7am and 8am. Otherwise, partly sunny, with a high near 85. Chance of precipitation is 70%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    High: 85 °F

    Chance
    Showers and
    Patchy Fog
    then Showers
    Likely

  • Monday Night

    Monday Night: Showers and possibly a thunderstorm. Low around 66. Chance of precipitation is 80%.

    Low: 66 °F

    Showers

  • Tuesday

    Tuesday: Showers likely, with thunderstorms also possible after 2pm. Partly sunny, with a high near 79. Chance of precipitation is 60%.

    High: 79 °F

    Showers
    Likely then
    Chance
    T-storms

  • Tuesday Night

    Tuesday Night: A chance of thunderstorms before 8pm. Mostly clear, with a low around 59. Chance of precipitation is 30%.

    Low: 59 °F

    Chance
    T-storms then
    Mostly Clear

Detailed Forecast

Overnight
A chance of showers and thunderstorms, mainly before 5am. Mostly cloudy, with a low around 65. South wind around 6 mph. Chance of precipitation is 30%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Saturday
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1pm. Mostly cloudy, with a high near 80. West wind 6 to 10 mph, with gusts as high as 20 mph. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Saturday Night
Patchy dense fog after 2am. Otherwise, partly cloudy, with a low around 58. West wind around 5 mph becoming calm in the evening.
Sunday
Patchy fog before 8am. Otherwise, sunny, with a high near 84. Calm wind becoming west around 5 mph in the afternoon.
Sunday Night
Patchy fog after 3am. Otherwise, partly cloudy, with a low around 62. Calm wind.
Monday
A chance of showers before 11am, then a chance of showers and thunderstorms between 11am and 2pm, then showers likely and possibly a thunderstorm after 2pm. Patchy fog between 7am and 8am. Otherwise, partly sunny, with a high near 85. Chance of precipitation is 70%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Monday Night
Showers and possibly a thunderstorm. Low around 66. Chance of precipitation is 80%.
Tuesday
Showers likely, with thunderstorms also possible after 2pm. Partly sunny, with a high near 79. Chance of precipitation is 60%.
Tuesday Night
A chance of thunderstorms before 8pm. Mostly clear, with a low around 59. Chance of precipitation is 30%.
Wednesday
Sunny, with a high near 80.
Wednesday Night
Partly cloudy, with a low around 60.
Thursday
A chance of showers and thunderstorms. Mostly sunny, with a high near 79. Chance of precipitation is 30%.
Thursday Night
A chance of showers and thunderstorms. Partly cloudy, with a low around 57. Chance of precipitation is 30%.
Independence Day
Mostly sunny, with a high near 78.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Saint Marys PA
 41.44°N 78.57°W (Elev. 1795 ft)
Last Update:
10:42 pm EDT Jun 27, 2025
Forecast Valid:
12am EDT Jun 28, 2025-6pm EDT Jul 4, 2025
 
Forecast Discussion
 
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Additional Resources

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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