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.

Overcast

67°F

19°C

Humidity 87%
Wind Speed SE 7 mph
Barometer 30.15 in (1020.7 mb)
Dewpoint 63°F (17°C)
Visibility 10.00 mi
Last update 27 Jun 1:53 am EDT
Extended Forecast for

Herndon PA

  • Overnight

    Overnight: A chance of showers and thunderstorms. Mostly cloudy, with a low around 66. Calm wind. Chance of precipitation is 30%.

    Low: 66 °F

    Chance
    Showers

  • Friday

    Friday: A chance of showers, with thunderstorms also possible after 2pm. Cloudy, with a high near 74. Calm wind becoming southeast around 6 mph in the morning. Chance of precipitation is 30%.

    High: 74 °F

    Chance
    Showers then
    Slight Chance
    T-storms

  • Friday Night

    Friday Night: A chance of showers and thunderstorms. Mostly cloudy, with a low around 67. Southeast wind around 5 mph becoming calm in the evening. Chance of precipitation is 50%. New precipitation amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    Low: 67 °F

    Chance
    Showers

  • Saturday

    Saturday: A slight chance of showers before 11am, then a slight chance of showers and thunderstorms between 11am and 2pm, then showers likely and possibly a thunderstorm after 2pm. Partly sunny, with a high near 90. Calm wind becoming southwest around 6 mph in the afternoon. Chance of precipitation is 70%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    High: 90 °F

    Slight Chance
    T-storms then
    Showers
    Likely

  • Saturday Night

    Saturday Night: Showers likely and possibly a thunderstorm before 8pm. Patchy fog after 1am. Otherwise, partly cloudy, with a low around 65. Calm wind. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    Low: 65 °F

    Showers
    Likely then
    Patchy Fog

  • Sunday

    Sunday: A slight chance of showers after 2pm. Patchy fog before 7am. Otherwise, sunny, with a high near 88. Chance of precipitation is 20%.

    High: 88 °F

    Patchy Fog
    then Slight
    Chance
    Showers

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 67.

    Low: 67 °F

    Mostly Clear

  • Monday

    Monday: Showers and thunderstorms likely after 2pm. Partly sunny, with a high near 91. Chance of precipitation is 60%.

    High: 91 °F

    Mostly Sunny
    then T-storms
    Likely

  • Monday Night

    Monday Night: Showers and thunderstorms likely before 8pm, then showers likely and possibly a thunderstorm between 8pm and 2am, then a chance of showers after 2am. Patchy fog after 2am. Otherwise, mostly cloudy, with a low around 70. Chance of precipitation is 60%.

    Low: 70 °F

    T-storms
    Likely then
    Showers
    Likely and
    Patchy Fog

Detailed Forecast

Overnight
A chance of showers and thunderstorms. Mostly cloudy, with a low around 66. Calm wind. Chance of precipitation is 30%.
Friday
A chance of showers, with thunderstorms also possible after 2pm. Cloudy, with a high near 74. Calm wind becoming southeast around 6 mph in the morning. Chance of precipitation is 30%.
Friday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 67. Southeast wind around 5 mph becoming calm in the evening. Chance of precipitation is 50%. New precipitation amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Saturday
A slight chance of showers before 11am, then a slight chance of showers and thunderstorms between 11am and 2pm, then showers likely and possibly a thunderstorm after 2pm. Partly sunny, with a high near 90. Calm wind becoming southwest around 6 mph in the afternoon. Chance of precipitation is 70%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Saturday Night
Showers likely and possibly a thunderstorm before 8pm. Patchy fog after 1am. Otherwise, partly cloudy, with a low around 65. Calm wind. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Sunday
A slight chance of showers after 2pm. Patchy fog before 7am. Otherwise, sunny, with a high near 88. Chance of precipitation is 20%.
Sunday Night
Mostly clear, with a low around 67.
Monday
Showers and thunderstorms likely after 2pm. Partly sunny, with a high near 91. Chance of precipitation is 60%.
Monday Night
Showers and thunderstorms likely before 8pm, then showers likely and possibly a thunderstorm between 8pm and 2am, then a chance of showers after 2am. Patchy fog after 2am. Otherwise, mostly cloudy, with a low around 70. Chance of precipitation is 60%.
Tuesday
A chance of showers, then showers likely and possibly a thunderstorm after 2pm. Partly sunny, with a high near 88. Chance of precipitation is 60%.
Tuesday Night
Showers likely and possibly a thunderstorm. Mostly clear, with a low around 65. Chance of precipitation is 60%.
Wednesday
Sunny, with a high near 88.
Wednesday Night
Mostly clear, with a low around 63.
Thursday
Mostly sunny, with a high near 87.
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ABOUT THIS FORECAST

 
Point Forecast:
Herndon PA
 40.72°N 76.85°W (Elev. 397 ft)
Last Update:
11:08 pm EDT Jun 26, 2025
Forecast Valid:
2am EDT Jun 27, 2025-6pm EDT Jul 3, 2025
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

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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