National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce
Current conditions at

Selinsgrove Penn Valley Airport (KSEG)

Lat: 40.82°NLon: 76.87°WElev: 443ft.

Fair

23°F

-5°C

Humidity 92%
Wind Speed Calm
Barometer 30.11 in (1020.1 mb)
Dewpoint 21°F (-6°C)
Visibility 10.00 mi
Last update 13 Jan 2:53 am EST
Extended Forecast for

Mechanicsville PA

  • Overnight

    Overnight: Mostly clear, with a low around 27. Light southwest wind.

    Low: 27 °F

    Mostly Clear

  • Tuesday

    Tuesday: Increasing clouds, with a high near 46. Southwest wind 3 to 7 mph.

    High: 46 °F

    Increasing
    Clouds

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 38. Southwest wind 5 to 7 mph.

    Low: 38 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: A chance of rain, mainly after 1pm. Cloudy, with a high near 46. South wind around 6 mph. Chance of precipitation is 50%. New precipitation amounts of less than a tenth of an inch possible.

    High: 46 °F

    Slight Chance
    Rain then
    Chance Rain

  • Wednesday Night

    Wednesday Night: Rain likely before 1am, then a chance of rain and snow between 1am and 4am, then a chance of snow after 4am. Mostly cloudy, with a low around 22. Light and variable wind becoming west 5 to 10 mph in the evening. Winds could gust as high as 26 mph. Chance of precipitation is 60%. New snow accumulation of less than a half inch possible.

    Low: 22 °F

    Rain Likely
    then
    Rain/Snow
    Likely

  • Thursday

    Thursday: A chance of snow before 7am, then a slight chance of snow showers between 7am and 1pm. Partly sunny, with a high near 26. Chance of precipitation is 30%.

    High: 26 °F

    Chance Snow

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 14.

    Low: 14 °F

    Partly Cloudy

  • Friday

    Friday: Mostly sunny, with a high near 30.

    High: 30 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 24.

    Low: 24 °F

    Mostly Cloudy

Detailed Forecast

Overnight
Mostly clear, with a low around 27. Light southwest wind.
Tuesday
Increasing clouds, with a high near 46. Southwest wind 3 to 7 mph.
Tuesday Night
Mostly cloudy, with a low around 38. Southwest wind 5 to 7 mph.
Wednesday
A chance of rain, mainly after 1pm. Cloudy, with a high near 46. South wind around 6 mph. Chance of precipitation is 50%. New precipitation amounts of less than a tenth of an inch possible.
Wednesday Night
Rain likely before 1am, then a chance of rain and snow between 1am and 4am, then a chance of snow after 4am. Mostly cloudy, with a low around 22. Light and variable wind becoming west 5 to 10 mph in the evening. Winds could gust as high as 26 mph. Chance of precipitation is 60%. New snow accumulation of less than a half inch possible.
Thursday
A chance of snow before 7am, then a slight chance of snow showers between 7am and 1pm. Partly sunny, with a high near 26. Chance of precipitation is 30%.
Thursday Night
Partly cloudy, with a low around 14.
Friday
Mostly sunny, with a high near 30.
Friday Night
Mostly cloudy, with a low around 24.
Saturday
Partly sunny, with a high near 38.
Saturday Night
Mostly cloudy, with a low around 20.
Sunday
Partly sunny, with a high near 30.
Sunday Night
Mostly cloudy, with a low around 16.
M.L.King Day
Partly sunny, with a high near 27.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Mechanicsville PA
 40.96°N 76.6°W (Elev. 499 ft)
Last Update:
2:36 am EST Jan 13, 2026
Forecast Valid:
3am EST Jan 13, 2026-6pm EST Jan 19, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

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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