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.

Partly Cloudy

60°F

16°C

Humidity 62%
Wind Speed Calm
Barometer 30.23 in (1023.5 mb)
Dewpoint 47°F (8°C)
Visibility 10.00 mi
Last update 15 Oct 12:53 pm EDT
Extended Forecast for

Sunbury PA

  • This Afternoon

    This Afternoon: Sunny, with a high near 65. Light southeast wind.

    High: 65 °F

    Sunny

  • Tonight

    Tonight: Rain and possibly a thunderstorm. Low around 57. Light southeast wind becoming south 5 to 9 mph in the evening. Winds could gust as high as 23 mph. Chance of precipitation is 80%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    Low: 57 °F

    Mostly Cloudy
    then Rain

  • Friday

    Friday: Rain and thunderstorms likely before 3pm, then showers likely and possibly a thunderstorm between 3pm and 5pm, then a chance of showers and thunderstorms after 5pm. Mostly cloudy, with a high near 77. South wind around 9 mph, with gusts as high as 23 mph. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    High: 77 °F

    Showers
    Likely

  • Friday Night

    Friday Night: A chance of showers and thunderstorms before 8pm, then a slight chance of showers between 8pm and 2am. Mostly cloudy, with a low around 43. North wind 8 to 13 mph, with gusts as high as 29 mph. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    Low: 43 °F

    Chance
    Showers

  • Saturday

    Saturday: Mostly sunny, with a high near 51. North wind 10 to 14 mph, with gusts as high as 29 mph.

    High: 51 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Widespread frost, mainly after 3am. Otherwise, clear, with a low around 31.

    Low: 31 °F

    Frost

  • Sunday

    Sunday: Widespread frost before 9am. Otherwise, sunny, with a high near 58.

    High: 58 °F

    Frost then
    Sunny

  • Sunday Night

    Sunday Night: Areas of frost after 5am. Otherwise, mostly clear, with a low around 36.

    Low: 36 °F

    Mostly Clear
    then Areas
    Frost

  • Monday

    Monday: Areas of frost before 9am. Otherwise, sunny, with a high near 62.

    High: 62 °F

    Areas Frost
    then Mostly
    Sunny

Detailed Forecast

This Afternoon
Sunny, with a high near 65. Light southeast wind.
Tonight
Rain and possibly a thunderstorm. Low around 57. Light southeast wind becoming south 5 to 9 mph in the evening. Winds could gust as high as 23 mph. Chance of precipitation is 80%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Friday
Rain and thunderstorms likely before 3pm, then showers likely and possibly a thunderstorm between 3pm and 5pm, then a chance of showers and thunderstorms after 5pm. Mostly cloudy, with a high near 77. South wind around 9 mph, with gusts as high as 23 mph. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Friday Night
A chance of showers and thunderstorms before 8pm, then a slight chance of showers between 8pm and 2am. Mostly cloudy, with a low around 43. North wind 8 to 13 mph, with gusts as high as 29 mph. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Saturday
Mostly sunny, with a high near 51. North wind 10 to 14 mph, with gusts as high as 29 mph.
Saturday Night
Widespread frost, mainly after 3am. Otherwise, clear, with a low around 31.
Sunday
Widespread frost before 9am. Otherwise, sunny, with a high near 58.
Sunday Night
Areas of frost after 5am. Otherwise, mostly clear, with a low around 36.
Monday
Areas of frost before 9am. Otherwise, sunny, with a high near 62.
Monday Night
Partly cloudy, with a low around 40.
Tuesday
Mostly sunny, with a high near 64.
Tuesday Night
Partly cloudy, with a low around 40.
Wednesday
Mostly sunny, with a high near 64.
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ABOUT THIS FORECAST

 
Point Forecast:
Sunbury PA
 40.87°N 76.79°W (Elev. 482 ft)
Last Update:
12:31 pm EDT Oct 15, 2026
Forecast Valid:
1pm EDT Oct 15, 2026-6pm EDT Oct 21, 2026
 
Forecast Discussion
 
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Additional Resources

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Chance of Precipitation