National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce
News Headlines

Hazardous Weather Conditions

Current conditions at

St Marys Municipal Airport (KOYM)

Lat: 41.41°NLon: 78.5°WElev: 1934ft.

Partly Cloudy

5°F

-15°C

Humidity 51%
Wind Speed W 14 G 22 mph
Barometer 30.36 in
Dewpoint -9°F (-23°C)
Visibility 10.00 mi
Wind Chill-12°F (-24°C)
Last update 23 Jan 6:15 pm EST
Extended Forecast for

3 Miles NW Sinnamahoning PA

Cold Weather Advisory January 23, 06:21pm until January 24, 10:00am
Winter Storm Warning January 24, 10:00pm until January 26, 01:00pm
Click here for hazard details and duration
Cold Weather Advisory
Winter Storm Warning
  •  
    Cold Weather Advisory January 23, 06:21pm until January 24, 10:00am

    NOW until 10:00am Sat

    Cold Weather Advisory

  • Tonight

    Low: -4 °F

    Mostly Cloudy

  • Saturday

    Saturday: Partly sunny, with a high near 11. Wind chill values as low as -15. Northwest wind 3 to 7 mph.

    High: 11 °F

    Partly Sunny

  • Saturday Night

    Saturday Night: Snow after 1am. Low around 7. Wind chill values as low as -5. Light east wind increasing to 5 to 9 mph in the evening. Chance of precipitation is 80%. New snow accumulation of 1 to 2 inches possible.

    Low: 7 °F

    Mostly Cloudy
    then Snow

  • Sunday

    Sunday: Snow. The snow could be heavy at times. High near 15. Wind chill values as low as -5. Southeast wind around 10 mph, with gusts as high as 21 mph. Chance of precipitation is 100%. New snow accumulation of 6 to 10 inches possible.

    High: 15 °F

    Heavy Snow

  • Sunday Night

    Sunday Night: Snow. Low around 12. East wind 7 to 10 mph becoming northeast after midnight. Winds could gust as high as 20 mph. Chance of precipitation is 100%. New snow accumulation of 3 to 7 inches possible.

    Low: 12 °F

    Snow

  • Monday

    Monday: A chance of snow. Mostly cloudy, with a high near 17. Chance of precipitation is 50%. New snow accumulation of less than one inch possible.

    High: 17 °F

    Chance Snow

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 0.

    Low: 0 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: Mostly cloudy, with a high near 11.

    High: 11 °F

    Mostly Cloudy

Detailed Forecast

Tonight
Mostly cloudy, with a low around -4. Wind chill values as low as -20. Northwest wind 9 to 15 mph, with gusts as high as 29 mph.
Saturday
Partly sunny, with a high near 11. Wind chill values as low as -15. Northwest wind 3 to 7 mph.
Saturday Night
Snow after 1am. Low around 7. Wind chill values as low as -5. Light east wind increasing to 5 to 9 mph in the evening. Chance of precipitation is 80%. New snow accumulation of 1 to 2 inches possible.
Sunday
Snow. The snow could be heavy at times. High near 15. Wind chill values as low as -5. Southeast wind around 10 mph, with gusts as high as 21 mph. Chance of precipitation is 100%. New snow accumulation of 6 to 10 inches possible.
Sunday Night
Snow. Low around 12. East wind 7 to 10 mph becoming northeast after midnight. Winds could gust as high as 20 mph. Chance of precipitation is 100%. New snow accumulation of 3 to 7 inches possible.
Monday
A chance of snow. Mostly cloudy, with a high near 17. Chance of precipitation is 50%. New snow accumulation of less than one inch possible.
Monday Night
Mostly cloudy, with a low around 0.
Tuesday
Mostly cloudy, with a high near 11.
Tuesday Night
Mostly cloudy, with a low around 3.
Wednesday
Partly sunny, with a high near 14.
Wednesday Night
A chance of snow showers. Mostly cloudy, with a low around 0. Chance of precipitation is 30%.
Thursday
A chance of snow showers. Mostly cloudy, with a high near 13. Chance of precipitation is 30%.
Thursday Night
Mostly cloudy, with a low around -3.
Friday
Mostly cloudy, with a high near 15.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
3 Miles NW Sinnamahoning PA
 41.41°N 78.11°W (Elev. 2169 ft)
Last Update:
3:16 pm EST Jan 23, 2026
Forecast Valid:
6pm EST Jan 23, 2026-6pm EST Jan 30, 2026
 
Forecast Discussion
 
Get as KML Get as XML

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