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

47°F

8°C

Humidity 80%
Wind Speed Calm
Barometer 29.95 in (1014.4 mb)
Dewpoint 41°F (5°C)
Visibility 10.00 mi
Last update 15 May 6:53 am EDT
Extended Forecast for

Mechanicsville PA

  • Today

    Today: Cloudy, then gradually becoming mostly sunny, with a high near 69. Northwest wind 6 to 8 mph, with gusts as high as 20 mph.

    High: 69 °F

    Decreasing
    Clouds

  • Tonight

    Tonight: Mostly cloudy, then gradually becoming mostly clear, with a low around 47. Calm wind.

    Low: 47 °F

    Decreasing
    Clouds

  • Saturday

    Saturday: Sunny, with a high near 80. Calm wind becoming southwest 5 to 7 mph in the afternoon.

    High: 80 °F

    Sunny

  • Saturday Night

    Saturday Night: A chance of showers, mainly before 2am. Mostly cloudy, with a low around 60. Light southwest wind. Chance of precipitation is 40%.

    Low: 60 °F

    Chance
    Showers

  • Sunday

    Sunday: A slight chance of showers. Mostly sunny, with a high near 85. Light west wind. Chance of precipitation is 20%.

    High: 85 °F

    Slight Chance
    Showers

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 60.

    Low: 60 °F

    Partly Cloudy

  • Monday

    Monday: Sunny, with a high near 91.

    High: 91 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 65.

    Low: 65 °F

    Mostly Clear

  • Tuesday

    Tuesday: Mostly sunny, with a high near 91.

    High: 91 °F

    Mostly Sunny

Detailed Forecast

Today
Cloudy, then gradually becoming mostly sunny, with a high near 69. Northwest wind 6 to 8 mph, with gusts as high as 20 mph.
Tonight
Mostly cloudy, then gradually becoming mostly clear, with a low around 47. Calm wind.
Saturday
Sunny, with a high near 80. Calm wind becoming southwest 5 to 7 mph in the afternoon.
Saturday Night
A chance of showers, mainly before 2am. Mostly cloudy, with a low around 60. Light southwest wind. Chance of precipitation is 40%.
Sunday
A slight chance of showers. Mostly sunny, with a high near 85. Light west wind. Chance of precipitation is 20%.
Sunday Night
Partly cloudy, with a low around 60.
Monday
Sunny, with a high near 91.
Monday Night
Mostly clear, with a low around 65.
Tuesday
Mostly sunny, with a high near 91.
Tuesday Night
Partly cloudy, with a low around 68.
Wednesday
Showers likely. Partly sunny, with a high near 86. Chance of precipitation is 70%.
Wednesday Night
Showers likely. Mostly cloudy, with a low around 58. Chance of precipitation is 60%.
Thursday
A chance of showers. Partly sunny, with a high near 76. Chance of precipitation is 30%.
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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:
2:39 am EDT May 15, 2026
Forecast Valid:
7am EDT May 15, 2026-6pm EDT May 21, 2026
 
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