Williamstown, Pennsylvania Weather
your sport, your way
Air Sports Net on FacebookAir Sports Net on Google +Air Sports Net on TwitterReceive RSS UpdatesReceive Email Updates

Click for Hazardous Weather Outlook for Williamstown, Pennsylvania
Change location by the zip code or city,state: or search for other weather forecast locations in Pennsylvania by name.
Weather Forecast for Williamstown, Pennsylvania : Dauphin County
Issued: 1:05 pm EDT Sep 4, 2025 Latitude: 40.5800868 Longitude: -76.617742 View on Google Maps

MouseOver for Detail Forecast
Tonight Friday Saturday Sunday Monday Tuesday Wednesday Thursday
70% chance of thunderstorms on Tonight Mostly Sunny on Friday 80% chance of thunderstorms on Saturday Mostly Sunny on Sunday Sunny on Monday Sunny on Tuesday Sunny on Wednesday Mostly Sunny on Thursday
Low: 57°F High: 83°F High: 80°F High: 73°F High: 72°F High: 73°F High: 75°F High: 77°F
Low: 61°F Low: 52°F Low: 44°F Low: 43°F Low: 45°F Low: 48°F  
Thunderstorms Mostly Sunny Thunderstorms Mostly Sunny Sunny Sunny Sunny Mostly Sunny
-
Current Conditions at
SELINSGROVE - (KSEG)
66°
Cloudy
Heavy Thunderstorm Rain Fog
as of 6:39 PM EDST
Rel. Humidity: 93%
Dew Point: 64°F
Visibility: 1/2 Miles
Pressure: 29.76 in.
Flight Rule: IFR
Wind Data
Calm
Cloud Level(s): Scattered at 1800ft, Broken at 3900ft, Solid Overcast at 6000ft
70% chance of thunderstorms Tonight Tonight... Showers likely and possibly a thunderstorm before 11pm, then a chance of showers between 11pm and midnight. Cloudy, then gradually becoming partly cloudy, with a low around 57. South wind around 6 mph becoming calm in the evening. Chance of precipitation is 70%. New precipitation amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Mostly Sunny on Friday Friday... Mostly sunny, with a high near 83. Calm wind becoming southwest 5 to 8 mph in the morning. Winds could gust as high as 20 mph.
Cloudy on Friday Night Friday Night... Partly cloudy, with a low around 61. South wind 3 to 5 mph.
80% chance of thunderstorms Saturday Saturday... A chance of showers before 11am, then a chance of showers and thunderstorms between 11am and 2pm, then showers and possibly a thunderstorm after 2pm. High near 80. Calm wind becoming west around 6 mph in the afternoon. Chance of precipitation is 80%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
80% chance of thunderstorms Saturday Night Saturday Night... Showers and possibly a thunderstorm before 8pm, then a chance of showers. Low around 52. Northwest wind around 6 mph. Chance of precipitation is 80%. New precipitation amounts between a quarter and half of an inch possible.
Mostly Sunny on Sunday Sunday... Mostly sunny, with a high near 73.
Mostly Clear on Sunday Night Sunday Night... Mostly clear, with a low around 44.
Sunny on Monday Monday... Sunny, with a high near 72.
Mostly Clear on Monday Night Monday Night... Mostly clear, with a low around 43.
Sunny on Tuesday Tuesday... Sunny, with a high near 73.
Mostly Clear on Tuesday Night Tuesday Night... Mostly clear, with a low around 45.
Sunny on Wednesday Wednesday... Sunny, with a high near 75.
Mostly Clear on Wednesday Night Wednesday Night... Mostly clear, with a low around 48.
Mostly Sunny on Thursday Thursday... Mostly sunny, with a high near 77.
Sun Almanac for Williamstown, Pennsylvania
Sunrise: 06:37 AM
Sunset: 7:34 PM
Civil Sunrise:06:09 AM
Civil Sunset: 8:01 PM
Nautical Sunrise: 05:36 AM
Nautical Sunset: 8:35 PM
Astro Sunrise: 05:02 AM
Astro Sunset: 9:09 PM
Any use of the information on this page is at your own risk. This information should not be relied upon in life-threatening situations, potential financial loss situations or in lieu of any officially disseminated information. Visit the National Weather Service for official information.