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

65°F

18°C

Humidity 97%
Wind Speed Calm
Barometer 30.15 in (1020.7 mb)
Dewpoint 64°F (18°C)
Visibility 10.00 mi
Last update 15 Aug 10:53 pm EDT
Extended Forecast for

Sunbury PA

  • Overnight

    Overnight: Mostly cloudy, with a low around 67. Calm wind.

    Low: 67 °F

    Mostly Cloudy

  • Sunday

    Sunday: A chance of showers and thunderstorms, then showers and possibly a thunderstorm after 11am. High near 78. Calm wind becoming south 5 to 8 mph in the morning. Winds could gust as high as 21 mph. Chance of precipitation is 80%. New rainfall amounts between a half and three quarters of an inch possible.

    High: 78 °F

    Showers

  • Sunday Night

    Sunday Night: Showers and thunderstorms before 2am, then a chance of showers between 2am and 3am. Low around 68. South wind around 6 mph becoming calm after midnight. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.

    Low: 68 °F

    Showers then
    Showers
    Likely

  • Monday

    Monday: A chance of showers and thunderstorms after 2pm. Partly sunny, with a high near 85. Calm wind becoming northwest around 6 mph in the afternoon. Chance of precipitation is 50%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    High: 85 °F

    Partly Sunny
    then Chance
    Showers

  • Monday Night

    Monday Night: A chance of showers before 8pm. Partly cloudy, with a low around 62. Calm wind. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch possible.

    Low: 62 °F

    Chance
    Showers then
    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 83.

    High: 83 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 60.

    Low: 60 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 84.

    High: 84 °F

    Sunny

  • Wednesday Night

    Wednesday Night: A chance of showers. Mostly cloudy, with a low around 64. Chance of precipitation is 30%.

    Low: 64 °F

    Chance
    Showers

Detailed Forecast

Overnight
Mostly cloudy, with a low around 67. Calm wind.
Sunday
A chance of showers and thunderstorms, then showers and possibly a thunderstorm after 11am. High near 78. Calm wind becoming south 5 to 8 mph in the morning. Winds could gust as high as 21 mph. Chance of precipitation is 80%. New rainfall amounts between a half and three quarters of an inch possible.
Sunday Night
Showers and thunderstorms before 2am, then a chance of showers between 2am and 3am. Low around 68. South wind around 6 mph becoming calm after midnight. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.
Monday
A chance of showers and thunderstorms after 2pm. Partly sunny, with a high near 85. Calm wind becoming northwest around 6 mph in the afternoon. Chance of precipitation is 50%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Monday Night
A chance of showers before 8pm. Partly cloudy, with a low around 62. Calm wind. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch possible.
Tuesday
Sunny, with a high near 83.
Tuesday Night
Mostly clear, with a low around 60.
Wednesday
Sunny, with a high near 84.
Wednesday Night
A chance of showers. Mostly cloudy, with a low around 64. Chance of precipitation is 30%.
Thursday
A chance of showers before 2pm. Partly sunny, with a high near 80. Chance of precipitation is 30%.
Thursday Night
Partly cloudy, with a low around 58.
Friday
Mostly sunny, with a high near 79.
Friday Night
Partly cloudy, with a low around 59.
Saturday
A chance of showers. Partly sunny, with a high near 80. Chance of precipitation is 30%.
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ABOUT THIS FORECAST

 
Point Forecast:
Sunbury PA
 40.87°N 76.79°W (Elev. 482 ft)
Last Update:
9:46 pm EDT Aug 15, 2026
Forecast Valid:
12am EDT Aug 16, 2026-6pm EDT Aug 22, 2026
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation