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

80°F

27°C

Humidity 82%
Wind Speed SE 8 mph
Barometer 30.06 in (1017.6 mb)
Dewpoint 74°F (23°C)
Visibility 10.00 mi
Heat Index85°F (29°C)
Last update 13 Jul 10:53 am EDT
Extended Forecast for

Northumberland PA

Flood Watch July 13, 01:00pm until July 14, 01:00am
Click here for hazard details and duration
Flood Watch

  • Today

    Today: A chance of showers and thunderstorms, mainly after 5pm. Mostly cloudy, with a high near 87. South wind around 6 mph. Chance of precipitation is 30%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    High: 87 °F

    Chance
    T-storms

  • Tonight

    Tonight: Showers and thunderstorms likely before 5am, then a chance of showers. Mostly cloudy, with a low around 70. Calm wind. Chance of precipitation is 70%. New rainfall amounts between a quarter and half of an inch possible.

    Low: 70 °F

    Showers
    Likely

  • Monday

    Monday: A chance of showers before 11am, then a chance of showers and thunderstorms between 11am and 2pm, then showers likely and possibly a thunderstorm after 2pm. Partly sunny, with a high near 87. Calm wind. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    High: 87 °F

    Chance
    Showers then
    Showers
    Likely

  • Monday Night

    Monday Night: Showers and thunderstorms likely before 11pm, then isolated showers between 11pm and 2am. Mostly cloudy, with a low around 70. Calm wind. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    Low: 70 °F

    Showers
    Likely then
    Isolated
    Showers

  • Tuesday

    Tuesday: Isolated showers between 8am and 2pm, then scattered showers and thunderstorms after 2pm. Partly sunny, with a high near 91. Calm wind. Chance of precipitation is 40%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    High: 91 °F

    Isolated
    Showers then
    Scattered
    T-storms

  • Tuesday Night

    Tuesday Night: Scattered showers and thunderstorms before 8pm. Partly cloudy, with a low around 71. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    Low: 71 °F

    Scattered
    T-storms then
    Partly Cloudy

  • Wednesday

    Wednesday: Showers likely and possibly a thunderstorm after 2pm. Partly sunny, with a high near 90. Chance of precipitation is 60%.

    High: 90 °F

    Partly Sunny
    then Showers
    Likely

  • Wednesday Night

    Wednesday Night: Showers likely and possibly a thunderstorm before 8pm, then scattered showers and thunderstorms between 8pm and 2am. Mostly cloudy, with a low around 73. Chance of precipitation is 60%.

    Low: 73 °F

    Showers
    Likely then
    Scattered
    T-storms

  • Thursday

    Thursday: Scattered showers and thunderstorms between 8am and 2pm, then showers likely and possibly a thunderstorm after 2pm. Partly sunny, with a high near 91. Chance of precipitation is 70%.

    High: 91 °F

    Scattered
    Showers then
    Showers
    Likely

Detailed Forecast

Today
A chance of showers and thunderstorms, mainly after 5pm. Mostly cloudy, with a high near 87. South wind around 6 mph. Chance of precipitation is 30%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Tonight
Showers and thunderstorms likely before 5am, then a chance of showers. Mostly cloudy, with a low around 70. Calm wind. Chance of precipitation is 70%. New rainfall amounts between a quarter and half of an inch possible.
Monday
A chance of showers before 11am, then a chance of showers and thunderstorms between 11am and 2pm, then showers likely and possibly a thunderstorm after 2pm. Partly sunny, with a high near 87. Calm wind. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Monday Night
Showers and thunderstorms likely before 11pm, then isolated showers between 11pm and 2am. Mostly cloudy, with a low around 70. Calm wind. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Tuesday
Isolated showers between 8am and 2pm, then scattered showers and thunderstorms after 2pm. Partly sunny, with a high near 91. Calm wind. Chance of precipitation is 40%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Tuesday Night
Scattered showers and thunderstorms before 8pm. Partly cloudy, with a low around 71. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Wednesday
Showers likely and possibly a thunderstorm after 2pm. Partly sunny, with a high near 90. Chance of precipitation is 60%.
Wednesday Night
Showers likely and possibly a thunderstorm before 8pm, then scattered showers and thunderstorms between 8pm and 2am. Mostly cloudy, with a low around 73. Chance of precipitation is 60%.
Thursday
Scattered showers and thunderstorms between 8am and 2pm, then showers likely and possibly a thunderstorm after 2pm. Partly sunny, with a high near 91. Chance of precipitation is 70%.
Thursday Night
Showers likely and possibly a thunderstorm before 8pm, then scattered showers and thunderstorms between 8pm and 2am. Mostly cloudy, with a low around 72. Chance of precipitation is 60%.
Friday
Scattered showers and thunderstorms. Partly sunny, with a high near 88. Chance of precipitation is 40%.
Friday Night
Scattered showers and thunderstorms. Partly cloudy, with a low around 68. Chance of precipitation is 30%.
Saturday
Scattered showers. Mostly sunny, with a high near 88. Chance of precipitation is 30%.
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ABOUT THIS FORECAST

 
Point Forecast:
Northumberland PA
 40.89°N 76.79°W (Elev. 482 ft)
Last Update:
8:29 am EDT Jul 13, 2025
Forecast Valid:
11am EDT Jul 13, 2025-6pm EDT Jul 19, 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