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

70°F

21°C

Humidity 93%
Wind Speed Calm
Barometer 29.98 in (1014.7 mb)
Dewpoint 68°F (20°C)
Visibility 10.00 mi
Last update 10 Aug 10:53 pm EDT
Extended Forecast for

Lewisburg PA

  • Tonight

    Tonight: Patchy fog before 2am, then patchy fog after 4am. Otherwise, mostly cloudy, with a low around 68. Calm wind.

    Low: 68 °F

    Patchy Fog

  • Tuesday

    Tuesday: A slight chance of showers between 1pm and 2pm, then a chance of showers and thunderstorms after 2pm. Patchy fog before 7am. Otherwise, partly sunny, with a high near 85. Calm wind becoming west around 6 mph in the afternoon. Chance of precipitation is 30%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    High: 85 °F

    Patchy Fog
    then Chance
    T-storms

  • Tuesday Night

    Tuesday Night: A chance of showers and thunderstorms before 2am, then a slight chance of showers between 2am and 3am. Patchy fog after 5am. Otherwise, mostly cloudy, with a low around 63. Calm wind. Chance of precipitation is 50%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    Low: 63 °F

    Chance
    T-storms then
    Slight Chance
    T-storms and
    Patchy Fog

  • Wednesday

    Wednesday: Patchy fog before 7am. Otherwise, mostly cloudy, then gradually becoming sunny, with a high near 84. Light north wind.

    High: 84 °F

    Patchy Fog
    then Sunny

  • Wednesday Night

    Wednesday Night: A chance of showers and thunderstorms. Partly cloudy, with a low around 64. Calm wind. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    Low: 64 °F

    Chance
    Showers

  • Thursday

    Thursday: A slight chance of showers, with thunderstorms also possible after 2pm. Mostly sunny, with a high near 85. Chance of precipitation is 20%.

    High: 85 °F

    Slight Chance
    Showers then
    Slight Chance
    T-storms

  • Thursday Night

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

    Low: 63 °F

    Partly Cloudy

  • Friday

    Friday: Mostly sunny, with a high near 81.

    High: 81 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 56.

    Low: 56 °F

    Mostly Clear

Detailed Forecast

Tonight
Patchy fog before 2am, then patchy fog after 4am. Otherwise, mostly cloudy, with a low around 68. Calm wind.
Tuesday
A slight chance of showers between 1pm and 2pm, then a chance of showers and thunderstorms after 2pm. Patchy fog before 7am. Otherwise, partly sunny, with a high near 85. Calm wind becoming west around 6 mph in the afternoon. Chance of precipitation is 30%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Tuesday Night
A chance of showers and thunderstorms before 2am, then a slight chance of showers between 2am and 3am. Patchy fog after 5am. Otherwise, mostly cloudy, with a low around 63. Calm wind. Chance of precipitation is 50%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Wednesday
Patchy fog before 7am. Otherwise, mostly cloudy, then gradually becoming sunny, with a high near 84. Light north wind.
Wednesday Night
A chance of showers and thunderstorms. Partly cloudy, with a low around 64. Calm wind. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Thursday
A slight chance of showers, with thunderstorms also possible after 2pm. Mostly sunny, with a high near 85. Chance of precipitation is 20%.
Thursday Night
Partly cloudy, with a low around 63.
Friday
Mostly sunny, with a high near 81.
Friday Night
Mostly clear, with a low around 56.
Saturday
Sunny, with a high near 80.
Saturday Night
A chance of showers. Partly cloudy, with a low around 59. Chance of precipitation is 30%.
Sunday
A chance of showers. Partly sunny, with a high near 82. Chance of precipitation is 40%.
Sunday Night
A chance of showers. Mostly cloudy, with a low around 64. Chance of precipitation is 50%.
Monday
A chance of showers. Partly sunny, with a high near 81. Chance of precipitation is 30%.
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ABOUT THIS FORECAST

 
Point Forecast:
Lewisburg PA
 40.96°N 76.89°W (Elev. 499 ft)
Last Update:
10:47 pm EDT Aug 10, 2026
Forecast Valid:
11pm EDT Aug 10, 2026-6pm EDT Aug 17, 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