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

66°F

19°C

Humidity 47%
Wind Speed NE 6 mph
Barometer 30.24 in (1023.9 mb)
Dewpoint 45°F (7°C)
Visibility 10.00 mi
Last update 3 Oct 5:53 pm EDT
Extended Forecast for

Mechanicsville PA

  • Tonight

    Tonight: Partly cloudy, with a low around 51. Calm wind.

    Low: 51 °F

    Partly Cloudy

  • Sunday

    Sunday: A chance of light rain, mainly between 10am and 5pm. Cloudy, with a high near 61. Calm wind becoming southeast around 6 mph. Chance of precipitation is 40%. New precipitation amounts of less than a tenth of an inch possible.

    High: 61 °F

    Chance Light
    Rain

  • Sunday Night

    Sunday Night: Patchy fog after 9pm. Otherwise, mostly cloudy, with a low around 54. Calm wind.

    Low: 54 °F

    Patchy Fog

  • Monday

    Monday: Mostly sunny, with a high near 66. Light northwest wind increasing to 5 to 9 mph in the morning. Winds could gust as high as 22 mph.

    High: 66 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 37. Light northwest wind.

    Low: 37 °F

    Mostly Clear

  • Tuesday

    Tuesday: Patchy fog between 7am and 8am. Patchy frost between 7am and 8am. Otherwise, sunny, with a high near 63.

    High: 63 °F

    Patchy Frost
    and Patchy
    Fog then
    Sunny

  • Tuesday Night

    Tuesday Night: Clear, with a low around 41.

    Low: 41 °F

    Clear

  • Wednesday

    Wednesday: Patchy frost between 7am and 8am. Otherwise, sunny, with a high near 69.

    High: 69 °F

    Patchy Frost
    then Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 45.

    Low: 45 °F

    Mostly Clear

Detailed Forecast

Tonight
Partly cloudy, with a low around 51. Calm wind.
Sunday
A chance of light rain, mainly between 10am and 5pm. Cloudy, with a high near 61. Calm wind becoming southeast around 6 mph. Chance of precipitation is 40%. New precipitation amounts of less than a tenth of an inch possible.
Sunday Night
Patchy fog after 9pm. Otherwise, mostly cloudy, with a low around 54. Calm wind.
Monday
Mostly sunny, with a high near 66. Light northwest wind increasing to 5 to 9 mph in the morning. Winds could gust as high as 22 mph.
Monday Night
Mostly clear, with a low around 37. Light northwest wind.
Tuesday
Patchy fog between 7am and 8am. Patchy frost between 7am and 8am. Otherwise, sunny, with a high near 63.
Tuesday Night
Clear, with a low around 41.
Wednesday
Patchy frost between 7am and 8am. Otherwise, sunny, with a high near 69.
Wednesday Night
Mostly clear, with a low around 45.
Thursday
Sunny, with a high near 71.
Thursday Night
Mostly clear, with a low around 45.
Friday
Sunny, with a high near 71.
Friday Night
Partly cloudy, with a low around 46.
Saturday
Mostly sunny, with a high near 69.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Mechanicsville PA
 40.96°N 76.6°W (Elev. 499 ft)
Last Update:
2:21 pm EDT Oct 3, 2026
Forecast Valid:
6pm EDT Oct 3, 2026-6pm EDT Oct 10, 2026
 
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