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

Hazardous Weather Conditions

Current conditions at

Selinsgrove Penn Valley Airport (KSEG)

Lat: 40.82°NLon: 76.87°WElev: 443ft.

Overcast

42°F

6°C

Humidity 89%
Wind Speed S 12 mph
Barometer 30.17 in (1021.8 mb)
Dewpoint 39°F (4°C)
Visibility 10.00 mi
Wind Chill35°F (2°C)
Last update 7 Mar 9:53 am EST
Extended Forecast for

Northumberland PA

  • Today

    Today: A chance of showers, mainly after 5pm. Areas of fog before 1pm. Otherwise, cloudy, with a high near 57. South wind 5 to 7 mph. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch possible.

    High: 57 °F

    Areas Fog
    then Chance
    Showers and
    Patchy Fog

  • Tonight

    Tonight: Showers and thunderstorms likely before 1am, then a chance of showers. Cloudy, with a low around 54. Southwest wind around 6 mph. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    Low: 54 °F

    Showers
    Likely

  • Sunday

    Sunday: Cloudy through mid morning, then gradual clearing, with a high near 60. West wind 6 to 9 mph, with gusts as high as 20 mph.

    High: 60 °F

    Gradual
    Clearing

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 39. Light southwest wind.

    Low: 39 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 67. Calm wind becoming southwest 5 to 9 mph in the morning. Winds could gust as high as 20 mph.

    High: 67 °F

    Sunny

  • Monday Night

    Monday Night: Clear, with a low around 45.

    Low: 45 °F

    Clear

  • Tuesday

    Tuesday: Sunny, with a high near 72.

    High: 72 °F

    Sunny

  • Tuesday Night

    Tuesday Night: A chance of showers after 1am. Mostly cloudy, with a low around 53. Chance of precipitation is 40%.

    Low: 53 °F

    Partly Cloudy
    then Chance
    Showers

  • Wednesday

    Wednesday: Showers likely. Mostly cloudy, with a high near 71. Chance of precipitation is 70%.

    High: 71 °F

    Showers
    Likely

Detailed Forecast

Today
A chance of showers, mainly after 5pm. Areas of fog before 1pm. Otherwise, cloudy, with a high near 57. South wind 5 to 7 mph. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch possible.
Tonight
Showers and thunderstorms likely before 1am, then a chance of showers. Cloudy, with a low around 54. Southwest wind around 6 mph. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Sunday
Cloudy through mid morning, then gradual clearing, with a high near 60. West wind 6 to 9 mph, with gusts as high as 20 mph.
Sunday Night
Mostly clear, with a low around 39. Light southwest wind.
Monday
Sunny, with a high near 67. Calm wind becoming southwest 5 to 9 mph in the morning. Winds could gust as high as 20 mph.
Monday Night
Clear, with a low around 45.
Tuesday
Sunny, with a high near 72.
Tuesday Night
A chance of showers after 1am. Mostly cloudy, with a low around 53. Chance of precipitation is 40%.
Wednesday
Showers likely. Mostly cloudy, with a high near 71. Chance of precipitation is 70%.
Wednesday Night
Rain likely. Cloudy, with a low around 41. Chance of precipitation is 70%.
Thursday
A chance of rain. Mostly cloudy, with a high near 51. Chance of precipitation is 30%.
Thursday Night
Partly cloudy, with a low around 28.
Friday
A chance of rain and snow. Mostly cloudy, with a high near 46. Chance of precipitation is 30%.
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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:
7:33 am EST Mar 7, 2026
Forecast Valid:
9am EST Mar 7, 2026-6pm EDT Mar 13, 2026
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation