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

27°F

-3°C

Humidity 69%
Wind Speed Calm
Barometer 30.15 in
Dewpoint 18°F (-8°C)
Visibility 10.00 mi
Last update 1 Dec 9:15 pm EST
Extended Forecast for

2 Miles ENE Brockport PA

Winter Weather Advisory December 2, 01:00am until December 2, 01:00pm
Click here for hazard details and duration
Winter Weather Advisory

  • Tonight

    Tonight: Snow, mainly after 3am. Low around 25. Calm wind becoming southeast around 6 mph after midnight. Chance of precipitation is 90%. Total nighttime snow accumulation of 1 to 2 inches possible.

    Low: 25 °F

    Slight Chance
    Snow then
    Snow

  • Tuesday

    Tuesday: Snow, mainly before 1pm. High near 33. Light and variable wind becoming northwest around 6 mph in the afternoon. Chance of precipitation is 100%. New snow accumulation of 1 to 3 inches possible.

    High: 33 °F

    Snow

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 21. Northwest wind around 6 mph becoming calm in the evening.

    Low: 21 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Mostly cloudy, with a high near 32. Southwest wind 5 to 9 mph.

    High: 32 °F

    Mostly Cloudy

  • Wednesday Night

    Wednesday Night: A chance of snow showers after 1am. Mostly cloudy, with a low around 23. Southwest wind 6 to 10 mph, with gusts as high as 21 mph. Chance of precipitation is 40%.

    Low: 23 °F

    Mostly Cloudy
    then Chance
    Snow Showers

  • Thursday

    Thursday: A chance of snow showers before 1pm. Partly sunny, with a high near 30. Chance of precipitation is 40%.

    High: 30 °F

    Chance Snow
    Showers

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 8.

    Low: 8 °F

    Partly Cloudy

  • Friday

    Friday: Mostly sunny, with a high near 29.

    High: 29 °F

    Mostly Sunny

  • Friday Night

    Friday Night: A chance of snow after 1am. Mostly cloudy, with a low around 18. Chance of precipitation is 30%.

    Low: 18 °F

    Mostly Cloudy
    then Chance
    Snow

Detailed Forecast

Tonight
Snow, mainly after 3am. Low around 25. Calm wind becoming southeast around 6 mph after midnight. Chance of precipitation is 90%. Total nighttime snow accumulation of 1 to 2 inches possible.
Tuesday
Snow, mainly before 1pm. High near 33. Light and variable wind becoming northwest around 6 mph in the afternoon. Chance of precipitation is 100%. New snow accumulation of 1 to 3 inches possible.
Tuesday Night
Mostly cloudy, with a low around 21. Northwest wind around 6 mph becoming calm in the evening.
Wednesday
Mostly cloudy, with a high near 32. Southwest wind 5 to 9 mph.
Wednesday Night
A chance of snow showers after 1am. Mostly cloudy, with a low around 23. Southwest wind 6 to 10 mph, with gusts as high as 21 mph. Chance of precipitation is 40%.
Thursday
A chance of snow showers before 1pm. Partly sunny, with a high near 30. Chance of precipitation is 40%.
Thursday Night
Partly cloudy, with a low around 8.
Friday
Mostly sunny, with a high near 29.
Friday Night
A chance of snow after 1am. Mostly cloudy, with a low around 18. Chance of precipitation is 30%.
Saturday
Mostly cloudy, with a high near 35.
Saturday Night
A chance of snow. Mostly cloudy, with a low around 24. Chance of precipitation is 40%.
Sunday
A chance of snow. Mostly cloudy, with a high near 33. Chance of precipitation is 40%.
Sunday Night
A chance of snow. Mostly cloudy, with a low around 15. Chance of precipitation is 40%.
Monday
A chance of snow. Partly sunny, with a high near 27. Chance of precipitation is 30%.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
2 Miles ENE Brockport PA
 41.29°N 78.69°W (Elev. 1585 ft)
Last Update:
7:06 pm EST Dec 1, 2025
Forecast Valid:
9pm EST Dec 1, 2025-6pm EST Dec 8, 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