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.

Fair

55°F

13°C

Humidity 96%
Wind Speed Calm
Barometer 30.05 in (1017.3 mb)
Dewpoint 54°F (12°C)
Visibility 9.00 mi
Last update 25 Jun 2:53 am EDT
Extended Forecast for

Northumberland PA

  • Overnight

    Overnight: Partly cloudy, with a low around 57. Calm wind.

    Low: 57 °F

    Partly Cloudy

  • Thursday

    Thursday: Mostly sunny, with a high near 85. Calm wind becoming south 5 to 7 mph in the afternoon.

    High: 85 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Showers and thunderstorms before 2am, then a chance of showers. Patchy fog after 3am. Low around 61. Calm wind. Chance of precipitation is 100%. New rainfall amounts between a quarter and half of an inch possible.

    Low: 61 °F

    Showers then
    Showers
    Likely and
    Patchy Fog

  • Friday

    Friday: Patchy fog before 8am. Otherwise, mostly cloudy, with a high near 84. Calm wind becoming west around 6 mph in the afternoon.

    High: 84 °F

    Patchy Fog
    then Mostly
    Cloudy

  • Friday Night

    Friday Night: Showers likely, mainly after 2am. Mostly cloudy, with a low around 63. Calm wind. Chance of precipitation is 70%. New precipitation amounts between a tenth and quarter of an inch possible.

    Low: 63 °F

    Chance
    Showers then
    Showers
    Likely

  • Saturday

    Saturday: Showers likely, with thunderstorms also possible after 2pm. Mostly cloudy, with a high near 80. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    High: 80 °F

    Showers
    Likely

  • Saturday Night

    Saturday Night: A chance of showers before 8pm. Partly cloudy, with a low around 62. Chance of precipitation is 30%.

    Low: 62 °F

    Chance
    Showers then
    Partly Cloudy

  • Sunday

    Sunday: Mostly sunny, with a high near 85.

    High: 85 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 63.

    Low: 63 °F

    Partly Cloudy

Detailed Forecast

Overnight
Partly cloudy, with a low around 57. Calm wind.
Thursday
Mostly sunny, with a high near 85. Calm wind becoming south 5 to 7 mph in the afternoon.
Thursday Night
Showers and thunderstorms before 2am, then a chance of showers. Patchy fog after 3am. Low around 61. Calm wind. Chance of precipitation is 100%. New rainfall amounts between a quarter and half of an inch possible.
Friday
Patchy fog before 8am. Otherwise, mostly cloudy, with a high near 84. Calm wind becoming west around 6 mph in the afternoon.
Friday Night
Showers likely, mainly after 2am. Mostly cloudy, with a low around 63. Calm wind. Chance of precipitation is 70%. New precipitation amounts between a tenth and quarter of an inch possible.
Saturday
Showers likely, with thunderstorms also possible after 2pm. Mostly cloudy, with a high near 80. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Saturday Night
A chance of showers before 8pm. Partly cloudy, with a low around 62. Chance of precipitation is 30%.
Sunday
Mostly sunny, with a high near 85.
Sunday Night
Partly cloudy, with a low around 63.
Monday
Mostly sunny, with a high near 89.
Monday Night
Partly cloudy, with a low around 67.
Tuesday
Mostly sunny and hot, with a high near 95.
Tuesday Night
Partly cloudy, with a low around 70.
Wednesday
Mostly sunny and hot, with a high near 97.
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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:
2:20 am EDT Jun 25, 2026
Forecast Valid:
3am EDT Jun 25, 2026-6pm EDT Jul 1, 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