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.

Overcast

48°F

9°C

Humidity 80%
Wind Speed NW 6 mph
Barometer 29.93 in (1013.5 mb)
Dewpoint 42°F (6°C)
Visibility 10.00 mi
Wind Chill45°F (7°C)
Last update 15 May 5:53 am EDT
Extended Forecast for

Northumberland PA

  • Today

    Today: Partly sunny, with a high near 70. Northwest wind 6 to 8 mph, with gusts as high as 21 mph.

    High: 70 °F

    Partly Sunny

  • Tonight

    Tonight: Mostly cloudy, then gradually becoming mostly clear, with a low around 48. Calm wind.

    Low: 48 °F

    Decreasing
    Clouds

  • Saturday

    Saturday: Sunny, with a high near 81. Calm wind becoming south 5 to 8 mph in the afternoon.

    High: 81 °F

    Sunny

  • Saturday Night

    Saturday Night: A chance of showers, mainly before 2am. Mostly cloudy, with a low around 60. Light south wind. Chance of precipitation is 40%. New precipitation amounts of less than a tenth of an inch possible.

    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
Partly sunny, with a high near 70. Northwest wind 6 to 8 mph, with gusts as high as 21 mph.
Tonight
Mostly cloudy, then gradually becoming mostly clear, with a low around 48. Calm wind.
Saturday
Sunny, with a high near 81. Calm wind becoming south 5 to 8 mph in the afternoon.
Saturday Night
A chance of showers, mainly before 2am. Mostly cloudy, with a low around 60. Light south wind. Chance of precipitation is 40%. New precipitation amounts of less than a tenth of an inch possible.
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%.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Northumberland PA
 40.89°N 76.79°W (Elev. 482 ft)
Last Update:
2:39 am EDT May 15, 2026
Forecast Valid:
6am EDT May 15, 2026-6pm EDT May 21, 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