National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Areas of Excessive Rainfall; Watching for Tropical Cyclone Development in the Atlantic

Heavy to excessive rainfall Wednesday may bring areas of flash and urban flooding over portions of the Ohio and Tennessee Valleys. In Arizona and New Mexico, heavy to excessive rainfall from monsoon thunderstorms may bring isolated flash and urban flooding Thursday into Saturday. Two tropical waves in the Atlantic are being monitored for tropical cyclone formation within the next few days. Read More >

Hazardous Weather Conditions

Current conditions at

Selinsgrove Penn Valley Airport (KSEG)

Lat: 40.82°NLon: 76.87°WElev: 443ft.

Fog/Mist

63°F

17°C

Humidity 100%
Wind Speed Calm
Barometer 30.02 in (1016.4 mb)
Dewpoint 63°F (17°C)
Visibility 5.00 mi
Last update 24 Sep 6:53 am EDT
Extended Forecast for

Sunbury PA

Dense Fog Advisory September 24, 07:09am until September 24, 10:00am
Click here for hazard details and duration
...
  •  
    Dense Fog Advisory September 24, 07:09am until September 24, 10:00am

    NOW until 10:00am Wed

    Dense Fog Advisory

  • Today

    High: 78 °F

    Areas Dense
    Fog then
    Chance
    Showers

  • Tonight

    Tonight: Showers and thunderstorms, mainly before 1am, then showers likely and possibly a thunderstorm after 5am. Low around 66. Light southeast wind. Chance of precipitation is 90%. New rainfall amounts between a half and three quarters of an inch possible.

    Low: 66 °F

    Showers then
    Showers
    Likely

  • Thursday

    Thursday: Showers, with thunderstorms also possible after 2pm. High near 76. South wind around 6 mph. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.

    High: 76 °F

    Showers

  • Thursday Night

    Thursday Night: A chance of showers and thunderstorms. Mostly cloudy, with a low around 60. Light and variable wind. Chance of precipitation is 40%. New precipitation amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    Low: 60 °F

    Chance
    T-storms then
    Chance
    Showers

  • Friday

    Friday: A slight chance of showers. Mostly sunny, with a high near 79. Calm wind becoming northwest around 5 mph in the afternoon. Chance of precipitation is 20%.

    High: 79 °F

    Slight Chance
    Showers

  • Friday Night

    Friday Night: Partly cloudy, with a low around 56.

    Low: 56 °F

    Partly Cloudy

  • Saturday

    Saturday: Mostly cloudy, with a high near 78.

    High: 78 °F

    Mostly Cloudy

  • Saturday Night

    Saturday Night: Mostly cloudy, with a low around 59.

    Low: 59 °F

    Mostly Cloudy

Detailed Forecast

Today
A chance of showers, mainly after 5pm. Areas of dense fog before noon. Otherwise, cloudy, with a high near 78. Calm wind. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch possible.
Tonight
Showers and thunderstorms, mainly before 1am, then showers likely and possibly a thunderstorm after 5am. Low around 66. Light southeast wind. Chance of precipitation is 90%. New rainfall amounts between a half and three quarters of an inch possible.
Thursday
Showers, with thunderstorms also possible after 2pm. High near 76. South wind around 6 mph. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.
Thursday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 60. Light and variable wind. Chance of precipitation is 40%. New precipitation amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Friday
A slight chance of showers. Mostly sunny, with a high near 79. Calm wind becoming northwest around 5 mph in the afternoon. Chance of precipitation is 20%.
Friday Night
Partly cloudy, with a low around 56.
Saturday
Mostly cloudy, with a high near 78.
Saturday Night
Mostly cloudy, with a low around 59.
Sunday
Partly sunny, with a high near 79.
Sunday Night
Mostly cloudy, with a low around 58.
Monday
Partly sunny, with a high near 79.
Monday Night
Mostly cloudy, with a low around 56.
Tuesday
Mostly sunny, with a high near 79.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Sunbury PA
 40.87°N 76.79°W (Elev. 482 ft)
Last Update:
6:11 am EDT Sep 24, 2025
Forecast Valid:
7am EDT Sep 24, 2025-6pm EDT Sep 30, 2025
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

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