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

54°F

12°C

Humidity 87%
Wind Speed N 7 mph
Barometer 30.09 in (1018.8 mb)
Dewpoint 50°F (10°C)
Visibility 10.00 mi
Wind Chill52°F (11°C)
Last update 14 Oct 3:53 am EDT
Extended Forecast for

Northumberland PA

  • Today

    Today: Cloudy, then gradually becoming mostly sunny, with a high near 68. North wind 6 to 10 mph, with gusts as high as 21 mph.

    High: 68 °F

    Decreasing
    Clouds

  • Tonight

    Tonight: Partly cloudy, with a low around 47. North wind around 6 mph becoming calm in the evening.

    Low: 47 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 65. North wind 6 to 10 mph, with gusts as high as 20 mph.

    High: 65 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 38. North wind 3 to 7 mph.

    Low: 38 °F

    Mostly Clear

  • Thursday

    Thursday: Sunny, with a high near 62. North wind 6 to 10 mph, with gusts as high as 21 mph.

    High: 62 °F

    Sunny

  • Thursday Night

    Thursday Night: Areas of frost after 4am. Otherwise, mostly clear, with a low around 34.

    Low: 34 °F

    Clear then
    Areas Frost

  • Friday

    Friday: Widespread frost, mainly before 8am. Otherwise, sunny, with a high near 64.

    High: 64 °F

    Frost then
    Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 42.

    Low: 42 °F

    Partly Cloudy

  • Saturday

    Saturday: Partly sunny, with a high near 71.

    High: 71 °F

    Partly Sunny

Detailed Forecast

Today
Cloudy, then gradually becoming mostly sunny, with a high near 68. North wind 6 to 10 mph, with gusts as high as 21 mph.
Tonight
Partly cloudy, with a low around 47. North wind around 6 mph becoming calm in the evening.
Wednesday
Mostly sunny, with a high near 65. North wind 6 to 10 mph, with gusts as high as 20 mph.
Wednesday Night
Mostly clear, with a low around 38. North wind 3 to 7 mph.
Thursday
Sunny, with a high near 62. North wind 6 to 10 mph, with gusts as high as 21 mph.
Thursday Night
Areas of frost after 4am. Otherwise, mostly clear, with a low around 34.
Friday
Widespread frost, mainly before 8am. Otherwise, sunny, with a high near 64.
Friday Night
Partly cloudy, with a low around 42.
Saturday
Partly sunny, with a high near 71.
Saturday Night
Partly cloudy, with a low around 49.
Sunday
A chance of showers. Partly sunny, with a high near 73. Chance of precipitation is 50%.
Sunday Night
A chance of showers. Mostly cloudy, with a low around 47. Chance of precipitation is 50%.
Monday
A chance of showers. Partly sunny, with a high near 63. Chance of precipitation is 30%.
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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:
3:06 am EDT Oct 14, 2025
Forecast Valid:
4am EDT Oct 14, 2025-6pm EDT Oct 20, 2025
 
Forecast Discussion
 
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Additional Resources

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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