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.

Fog

67°F

19°C

Humidity 100%
Wind Speed Calm
Barometer 30.05 in (1017.1 mb)
Dewpoint 67°F (19°C)
Visibility 0.25 mi
Last update 2 Sep 2:53 am EDT
Extended Forecast for

Sunbury PA

  • Overnight

    Overnight: Patchy fog. Otherwise, mostly cloudy, with a low around 69. Calm wind.

    Low: 69 °F

    Patchy Fog

  • Wednesday

    Wednesday: A chance of showers and thunderstorms before 4pm, then a slight chance of thunderstorms between 4pm and 5pm, then a chance of showers and thunderstorms after 5pm. Some of the storms could be severe. Patchy fog before 9am. Otherwise, mostly cloudy, with a high near 82. Calm wind becoming south around 5 mph in the afternoon. Chance of precipitation is 50%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    High: 82 °F

    Chance
    Showers and
    Patchy Fog
    then Severe
    Thunderstorms

  • Wednesday Night

    Wednesday Night: A chance of showers and thunderstorms before 8pm, then showers likely and possibly a thunderstorm between 8pm and 1am, then a chance of showers and thunderstorms after 1am. Some of the storms could be severe. Mostly cloudy, with a low around 69. Light south wind. Chance of precipitation is 70%. New rainfall amounts between a quarter and half of an inch possible.

    Low: 69 °F

    Severe
    Thunderstorms

  • Thursday

    Thursday: A chance of thunderstorms before noon, then a chance of showers between noon and 1pm. Patchy fog before 8am. Otherwise, partly sunny, with a high near 89. Calm wind becoming west around 6 mph in the afternoon. Chance of precipitation is 30%. New precipitation amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    High: 89 °F

    Chance
    T-storms and
    Patchy Fog
    then Chance
    Showers

  • Thursday Night

    Thursday Night: A chance of showers and thunderstorms before 2am, then a slight chance of showers. Mostly cloudy, with a low around 69. Calm wind. Chance of precipitation is 40%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    Low: 69 °F

    Chance
    T-storms then
    Chance
    Showers

  • Friday

    Friday: A slight chance of showers before 8am, then a chance of showers and thunderstorms after 2pm. Partly sunny, with a high near 84. Chance of precipitation is 40%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    High: 84 °F

    Partly Sunny
    then Chance
    Showers

  • Friday Night

    Friday Night: A chance of showers before 8pm. Partly cloudy, with a low around 59. Chance of precipitation is 30%.

    Low: 59 °F

    Chance
    Showers then
    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 78.

    High: 78 °F

    Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 54.

    Low: 54 °F

    Mostly Clear

Detailed Forecast

Overnight
Patchy fog. Otherwise, mostly cloudy, with a low around 69. Calm wind.
Wednesday
A chance of showers and thunderstorms before 4pm, then a slight chance of thunderstorms between 4pm and 5pm, then a chance of showers and thunderstorms after 5pm. Some of the storms could be severe. Patchy fog before 9am. Otherwise, mostly cloudy, with a high near 82. Calm wind becoming south around 5 mph in the afternoon. Chance of precipitation is 50%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Wednesday Night
A chance of showers and thunderstorms before 8pm, then showers likely and possibly a thunderstorm between 8pm and 1am, then a chance of showers and thunderstorms after 1am. Some of the storms could be severe. Mostly cloudy, with a low around 69. Light south wind. Chance of precipitation is 70%. New rainfall amounts between a quarter and half of an inch possible.
Thursday
A chance of thunderstorms before noon, then a chance of showers between noon and 1pm. Patchy fog before 8am. Otherwise, partly sunny, with a high near 89. Calm wind becoming west around 6 mph in the afternoon. Chance of precipitation is 30%. New precipitation amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Thursday Night
A chance of showers and thunderstorms before 2am, then a slight chance of showers. Mostly cloudy, with a low around 69. Calm wind. Chance of precipitation is 40%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Friday
A slight chance of showers before 8am, then a chance of showers and thunderstorms after 2pm. Partly sunny, with a high near 84. Chance of precipitation is 40%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Friday Night
A chance of showers before 8pm. Partly cloudy, with a low around 59. Chance of precipitation is 30%.
Saturday
Sunny, with a high near 78.
Saturday Night
Mostly clear, with a low around 54.
Sunday
Sunny, with a high near 77.
Sunday Night
Mostly clear, with a low around 54.
Labor Day
Mostly sunny, with a high near 79.
Monday Night
Partly cloudy, with a low around 57.
Tuesday
Partly sunny, with a high near 79.
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ABOUT THIS FORECAST

 
Point Forecast:
Sunbury PA
 40.87°N 76.79°W (Elev. 482 ft)
Last Update:
2:16 am EDT Sep 2, 2026
Forecast Valid:
3am EDT Sep 2, 2026-6pm EDT Sep 8, 2026
 
Forecast Discussion
 
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Additional Resources

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Chance of Precipitation