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.

Mostly Cloudy

49°F

9°C

Humidity 66%
Wind Speed W 3 mph
Barometer 29.81 in (1009.5 mb)
Dewpoint 38°F (3°C)
Visibility 10.00 mi
Last update 9 Nov 4:53 am EST
Extended Forecast for

Northumberland PA

  • Today

    Today: A slight chance of showers between 8am and 9am. Partly sunny, with a high near 59. Northwest wind 9 to 17 mph, with gusts as high as 33 mph. Chance of precipitation is 20%.

    High: 59 °F

    Slight Chance
    Showers then
    Mostly Sunny

  • Tonight

    Tonight: Increasing clouds, with a low around 37. Northwest wind around 6 mph becoming calm in the evening.

    Low: 37 °F

    Increasing
    Clouds

  • Tuesday

    Tuesday: Cloudy through mid morning, then gradual clearing, with a high near 65. Calm wind becoming west 5 to 9 mph in the morning. Winds could gust as high as 20 mph.

    High: 65 °F

    Gradual
    Clearing

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 36. Light west wind.

    Low: 36 °F

    Mostly Clear

  • Veterans Day

    Veterans Day: Mostly sunny, with a high near 64. Light and variable wind.

    High: 64 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: A slight chance of rain after 1am. Mostly cloudy, with a low around 40. Chance of precipitation is 20%.

    Low: 40 °F

    Mostly Cloudy
    then Slight
    Chance Rain

  • Thursday

    Thursday: Rain, mainly after 1pm. High near 58. Chance of precipitation is 80%.

    High: 58 °F

    Chance Rain
    then Rain

  • Thursday Night

    Thursday Night: Showers. Low around 37. Chance of precipitation is 80%.

    Low: 37 °F

    Showers

  • Friday

    Friday: Showers likely, mainly before 1pm. Cloudy, with a high near 49. Chance of precipitation is 60%.

    High: 49 °F

    Showers
    Likely

Detailed Forecast

Today
A slight chance of showers between 8am and 9am. Partly sunny, with a high near 59. Northwest wind 9 to 17 mph, with gusts as high as 33 mph. Chance of precipitation is 20%.
Tonight
Increasing clouds, with a low around 37. Northwest wind around 6 mph becoming calm in the evening.
Tuesday
Cloudy through mid morning, then gradual clearing, with a high near 65. Calm wind becoming west 5 to 9 mph in the morning. Winds could gust as high as 20 mph.
Tuesday Night
Mostly clear, with a low around 36. Light west wind.
Veterans Day
Mostly sunny, with a high near 64. Light and variable wind.
Wednesday Night
A slight chance of rain after 1am. Mostly cloudy, with a low around 40. Chance of precipitation is 20%.
Thursday
Rain, mainly after 1pm. High near 58. Chance of precipitation is 80%.
Thursday Night
Showers. Low around 37. Chance of precipitation is 80%.
Friday
Showers likely, mainly before 1pm. Cloudy, with a high near 49. Chance of precipitation is 60%.
Friday Night
A chance of showers before 1am. Mostly cloudy, with a low around 33. Chance of precipitation is 30%.
Saturday
Mostly cloudy, with a high near 50.
Saturday Night
Mostly cloudy, with a low around 32.
Sunday
Partly sunny, with a high near 52.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Northumberland PA
 40.89°N 76.79°W (Elev. 482 ft)
Last Update:
4:46 am EST Nov 9, 2026
Forecast Valid:
5am EST Nov 9, 2026-6pm EST Nov 15, 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