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

63°F

17°C

Humidity 87%
Wind Speed SE 3 mph
Barometer 30.15 in (1020.8 mb)
Dewpoint 59°F (15°C)
Visibility 10.00 mi
Last update 15 Jun 9:53 pm EDT
Extended Forecast for

Northumberland PA

  • Tonight

    Tonight: A slight chance of showers before midnight. Cloudy, with a low around 59. Calm wind. Chance of precipitation is 20%.

    Low: 59 °F

    Slight Chance
    Showers then
    Cloudy

  • Monday

    Monday: A slight chance of showers after 9am. Cloudy, with a high near 69. Light and variable wind. Chance of precipitation is 20%.

    High: 69 °F

    Slight Chance
    Showers

  • Monday Night

    Monday Night: A chance of showers, mainly after 1am. Patchy fog after 2am. Otherwise, cloudy, with a low around 60. Calm wind. Chance of precipitation is 40%. New precipitation amounts of less than a tenth of an inch possible.

    Low: 60 °F

    Chance
    Showers and
    Patchy Fog

  • Tuesday

    Tuesday: Showers likely. Cloudy, with a high near 74. Calm wind becoming southeast around 6 mph in the afternoon. Chance of precipitation is 70%. New precipitation amounts between a tenth and quarter of an inch possible.

    High: 74 °F

    Showers
    Likely

  • Tuesday Night

    Tuesday Night: Showers likely and possibly a thunderstorm before 2am, then a chance of showers. Cloudy, with a low around 67. Light south wind. Chance of precipitation is 70%. New rainfall amounts between a quarter and half of an inch possible.

    Low: 67 °F

    Showers
    Likely

  • Wednesday

    Wednesday: A chance of showers, with thunderstorms also possible after 2pm. Partly sunny, with a high near 88. Chance of precipitation is 40%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    High: 88 °F

    Chance
    Showers

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 70.

    Low: 70 °F

    Partly Cloudy

  • Juneteenth

    Juneteenth: A chance of showers, then showers likely and possibly a thunderstorm after 2pm. Partly sunny, with a high near 87. Chance of precipitation is 60%.

    High: 87 °F

    Chance
    Showers then
    Showers
    Likely

  • Thursday Night

    Thursday Night: Showers likely and possibly a thunderstorm before 8pm. Partly cloudy, with a low around 64. Chance of precipitation is 60%.

    Low: 64 °F

    Showers
    Likely then
    Partly Cloudy

Detailed Forecast

Tonight
A slight chance of showers before midnight. Cloudy, with a low around 59. Calm wind. Chance of precipitation is 20%.
Monday
A slight chance of showers after 9am. Cloudy, with a high near 69. Light and variable wind. Chance of precipitation is 20%.
Monday Night
A chance of showers, mainly after 1am. Patchy fog after 2am. Otherwise, cloudy, with a low around 60. Calm wind. Chance of precipitation is 40%. New precipitation amounts of less than a tenth of an inch possible.
Tuesday
Showers likely. Cloudy, with a high near 74. Calm wind becoming southeast around 6 mph in the afternoon. Chance of precipitation is 70%. New precipitation amounts between a tenth and quarter of an inch possible.
Tuesday Night
Showers likely and possibly a thunderstorm before 2am, then a chance of showers. Cloudy, with a low around 67. Light south wind. Chance of precipitation is 70%. New rainfall amounts between a quarter and half of an inch possible.
Wednesday
A chance of showers, with thunderstorms also possible after 2pm. Partly sunny, with a high near 88. Chance of precipitation is 40%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Wednesday Night
Partly cloudy, with a low around 70.
Juneteenth
A chance of showers, then showers likely and possibly a thunderstorm after 2pm. Partly sunny, with a high near 87. Chance of precipitation is 60%.
Thursday Night
Showers likely and possibly a thunderstorm before 8pm. Partly cloudy, with a low around 64. Chance of precipitation is 60%.
Friday
Mostly sunny, with a high near 80.
Friday Night
Partly cloudy, with a low around 59.
Saturday
Mostly sunny, with a high near 85.
Saturday Night
Partly cloudy, with a low around 67.
Sunday
Mostly sunny, with a high near 89.
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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:
7:25 pm EDT Jun 15, 2025
Forecast Valid:
10pm EDT Jun 15, 2025-6pm EDT Jun 22, 2025
 
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