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

50°F

10°C

Humidity 57%
Wind Speed Calm
Barometer 30.20 in (1022.9 mb)
Dewpoint 35°F (2°C)
Visibility 10.00 mi
Last update 8 Jan 3:53 pm EST
Extended Forecast for

Herndon PA

  • Tonight

    Tonight: Patchy fog between 1am and 2am. Otherwise, increasing clouds, with a low around 35. Light and variable wind.

    Low: 35 °F

    Mostly Cloudy
    then Patchy
    Fog

  • Friday

    Friday: Rain likely, mainly after 1pm. Increasing clouds, with a high near 51. South wind 6 to 9 mph, with gusts as high as 22 mph. Chance of precipitation is 70%. New precipitation amounts between a tenth and quarter of an inch possible.

    High: 51 °F

    Chance Rain
    then Rain
    Likely

  • Friday Night

    Friday Night: A slight chance of rain before 10pm, then a slight chance of showers between 10pm and 1am. Cloudy, with a low around 39. Light and variable wind. Chance of precipitation is 20%.

    Low: 39 °F

    Slight Chance
    Rain

  • Saturday

    Saturday: Rain. High near 47. Light and variable wind. Chance of precipitation is 90%. New precipitation amounts between a quarter and half of an inch possible.

    High: 47 °F

    Rain Likely
    then Rain

  • Saturday Night

    Saturday Night: A chance of showers, mainly before 1am. Cloudy, with a low around 37. Calm wind becoming west around 5 mph after midnight. Chance of precipitation is 50%. New precipitation amounts between a tenth and quarter of an inch possible.

    Low: 37 °F

    Chance
    Showers

  • Sunday

    Sunday: Mostly sunny, with a high near 43.

    High: 43 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Mostly cloudy, with a low around 26.

    Low: 26 °F

    Mostly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 40.

    High: 40 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 28.

    Low: 28 °F

    Partly Cloudy

Detailed Forecast

Tonight
Patchy fog between 1am and 2am. Otherwise, increasing clouds, with a low around 35. Light and variable wind.
Friday
Rain likely, mainly after 1pm. Increasing clouds, with a high near 51. South wind 6 to 9 mph, with gusts as high as 22 mph. Chance of precipitation is 70%. New precipitation amounts between a tenth and quarter of an inch possible.
Friday Night
A slight chance of rain before 10pm, then a slight chance of showers between 10pm and 1am. Cloudy, with a low around 39. Light and variable wind. Chance of precipitation is 20%.
Saturday
Rain. High near 47. Light and variable wind. Chance of precipitation is 90%. New precipitation amounts between a quarter and half of an inch possible.
Saturday Night
A chance of showers, mainly before 1am. Cloudy, with a low around 37. Calm wind becoming west around 5 mph after midnight. Chance of precipitation is 50%. New precipitation amounts between a tenth and quarter of an inch possible.
Sunday
Mostly sunny, with a high near 43.
Sunday Night
Mostly cloudy, with a low around 26.
Monday
Mostly sunny, with a high near 40.
Monday Night
Partly cloudy, with a low around 28.
Tuesday
Mostly sunny, with a high near 45.
Tuesday Night
Mostly cloudy, with a low around 30.
Wednesday
Mostly cloudy, with a high near 44.
Wednesday Night
A chance of showers. Mostly cloudy, with a low around 28. Chance of precipitation is 30%.
Thursday
Mostly cloudy, with a high near 35.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Herndon PA
 40.72°N 76.85°W (Elev. 397 ft)
Last Update:
1:05 pm EST Jan 8, 2026
Forecast Valid:
4pm EST Jan 8, 2026-6pm EST Jan 15, 2026
 
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Additional Resources

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Hourly Weather Forecast

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation