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

Hazardous Weather Conditions

Current conditions at

Selinsgrove Penn Valley Airport (KSEG)

Lat: 40.82°NLon: 76.87°WElev: 443ft.

Fair

73°F

23°C

Humidity 96%
Wind Speed Calm
Barometer 30.10 in (1018.8 mb)
Dewpoint 72°F (22°C)
Visibility 8.00 mi
Last update 23 Jun 1:53 am EDT
Extended Forecast for

5 Miles NNE Mechanicsville PA

Heat Advisory June 23, 08:00pm until June 25, 08:00pm
Heat Advisory June 23, 02:50am until June 23, 10:00am
Extreme Heat Warning June 23, 10:00am until June 23, 08:00pm
Click here for hazard details and duration
Heat Advisory
Heat Advisory
Extreme Heat Warning
  •  
    Heat Advisory June 23, 02:50am until June 23, 10:00am

    NOW until 10:00am Mon

    Heat Advisory

  • Overnight

    Low: 71 °F

    Clear

  • Monday

    Monday: Sunny and hot, with a high near 96. Heat index values as high as 103. Calm wind becoming west around 6 mph in the afternoon.

    High: 96 °F

    Hot

  • Monday Night

    Monday Night: Mostly clear, with a low around 72. Calm wind.

    Low: 72 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny and hot, with a high near 96. Heat index values as high as 102. Calm wind becoming west around 6 mph in the afternoon.

    High: 96 °F

    Hot

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 71. Northwest wind around 5 mph becoming calm in the evening.

    Low: 71 °F

    Mostly Clear

  • Wednesday

    Wednesday: A chance of showers and thunderstorms after 2pm. Mostly sunny, with a high near 90. Chance of precipitation is 40%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    High: 90 °F

    Sunny then
    Chance
    T-storms

  • Wednesday Night

    Wednesday Night: A chance of showers and thunderstorms before 8pm. Mostly cloudy, with a low around 70. Chance of precipitation is 30%.

    Low: 70 °F

    Chance
    T-storms then
    Mostly Cloudy

  • Thursday

    Thursday: Showers likely and possibly a thunderstorm after 2pm. Partly sunny, with a high near 87. Chance of precipitation is 70%.

    High: 87 °F

    Partly Sunny
    then Showers
    Likely

Detailed Forecast

Overnight
Clear, with a low around 71. Calm wind.
Monday
Sunny and hot, with a high near 96. Heat index values as high as 103. Calm wind becoming west around 6 mph in the afternoon.
Monday Night
Mostly clear, with a low around 72. Calm wind.
Tuesday
Sunny and hot, with a high near 96. Heat index values as high as 102. Calm wind becoming west around 6 mph in the afternoon.
Tuesday Night
Mostly clear, with a low around 71. Northwest wind around 5 mph becoming calm in the evening.
Wednesday
A chance of showers and thunderstorms after 2pm. Mostly sunny, with a high near 90. Chance of precipitation is 40%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Wednesday Night
A chance of showers and thunderstorms before 8pm. Mostly cloudy, with a low around 70. Chance of precipitation is 30%.
Thursday
Showers likely and possibly a thunderstorm after 2pm. Partly sunny, with a high near 87. Chance of precipitation is 70%.
Thursday Night
Showers likely and possibly a thunderstorm before 8pm, then showers and thunderstorms likely between 8pm and 2am, then a chance of showers after 2am. Mostly cloudy, with a low around 69. Chance of precipitation is 60%.
Friday
A chance of showers, then showers likely and possibly a thunderstorm after 2pm. Partly sunny, with a high near 83. Chance of precipitation is 60%.
Friday Night
Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 68. Chance of precipitation is 60%.
Saturday
Showers likely. Partly sunny, with a high near 82. Chance of precipitation is 60%.
Saturday Night
Showers and thunderstorms likely. Mostly cloudy, with a low around 67. Chance of precipitation is 60%.
Sunday
A chance of showers and thunderstorms. Mostly sunny, with a high near 84. Chance of precipitation is 40%.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
5 Miles NNE Mechanicsville PA
 41.04°N 76.56°W (Elev. 1050 ft)
Last Update:
2:44 am EDT Jun 23, 2025
Forecast Valid:
2am EDT Jun 23, 2025-6pm EDT Jun 29, 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