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.

Partly Cloudy

65°F

18°C

Humidity 90%
Wind Speed Calm
Barometer 29.82 in (1009.7 mb)
Dewpoint 62°F (17°C)
Visibility 10.00 mi
Last update 5 Nov 5:53 pm EST
Extended Forecast for

Northumberland PA

  • Tonight

    Tonight: Patchy fog before 2am, then patchy fog after 4am. Otherwise, partly cloudy, with a low around 50. Light and variable wind.

    Low: 50 °F

    Patchy Fog

  • Friday

    Friday: Patchy fog before 9am. Otherwise, cloudy, then gradually becoming mostly sunny, with a high near 68. Calm wind.

    High: 68 °F

    Patchy Fog
    then Mostly
    Sunny

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 45. Calm wind becoming west around 5 mph after midnight.

    Low: 45 °F

    Mostly Cloudy

  • Saturday

    Saturday: A chance of showers, mainly between 7am and 1pm. Mostly cloudy, with a high near 55. West wind 5 to 9 mph, with gusts as high as 20 mph. Chance of precipitation is 30%.

    High: 55 °F

    Chance
    Showers

  • Saturday Night

    Saturday Night: Mostly cloudy, with a low around 41. West wind 7 to 9 mph, with gusts as high as 25 mph.

    Low: 41 °F

    Mostly Cloudy

  • Sunday

    Sunday: Mostly sunny, with a high near 61.

    High: 61 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 40.

    Low: 40 °F

    Mostly Clear

  • Monday

    Monday: Mostly sunny, with a high near 61.

    High: 61 °F

    Mostly Sunny

  • Monday Night

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

    Low: 37 °F

    Mostly Clear

Detailed Forecast

Tonight
Patchy fog before 2am, then patchy fog after 4am. Otherwise, partly cloudy, with a low around 50. Light and variable wind.
Friday
Patchy fog before 9am. Otherwise, cloudy, then gradually becoming mostly sunny, with a high near 68. Calm wind.
Friday Night
Mostly cloudy, with a low around 45. Calm wind becoming west around 5 mph after midnight.
Saturday
A chance of showers, mainly between 7am and 1pm. Mostly cloudy, with a high near 55. West wind 5 to 9 mph, with gusts as high as 20 mph. Chance of precipitation is 30%.
Saturday Night
Mostly cloudy, with a low around 41. West wind 7 to 9 mph, with gusts as high as 25 mph.
Sunday
Mostly sunny, with a high near 61.
Sunday Night
Mostly clear, with a low around 40.
Monday
Mostly sunny, with a high near 61.
Monday Night
Mostly clear, with a low around 37.
Tuesday
Mostly sunny, with a high near 65.
Tuesday Night
Mostly clear, with a low around 37.
Veterans Day
Mostly sunny, with a high near 60.
Wednesday Night
Partly cloudy, with a low around 32.
Thursday
Mostly sunny, with a high near 56.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Northumberland PA
 40.89°N 76.82°W (Elev. 545 ft)
Last Update:
2:16 pm EST Nov 5, 2026
Forecast Valid:
6pm EST Nov 5, 2026-6pm EST Nov 12, 2026
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation