South Mountain, Pennsylvania Weather
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Weather Forecast for South Mountain, Pennsylvania : Franklin County
Issued: 6:03 am EDT Sep 3, 2025 Latitude: 39.8464817 Longitude: -77.4877663 View on Google Maps

MouseOver for Detail Forecast
Today Tonight Thursday Friday Saturday Sunday Monday Tuesday
Sunny on Today Mostly Clear on Tonight 80% chance of thunderstorms on Thursday Sunny on Friday 60% chance of on Saturday Mostly Sunny on Sunday Sunny on Monday Mostly Sunny on Tuesday
High: 76°F Low: 56°F High: 78°F High: 81°F High: 73°F High: 68°F High: 69°F High: 69°F
Low: 56°F Low: 59°F Low: 50°F Low: 46°F Low: 47°F  
Sunny Mostly Clear Thunderstorms Sunny Partly Sunny Mostly Sunny Sunny Mostly Sunny
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Current Conditions at
COLLEGE PARK ARPT - (KCGS)
66°
Clear
as of 9:35 AM EDST
Rel. Humidity: 77%
Dew Point: 59°F
Visibility: 10 Miles
Pressure: 30.00 in.
Flight Rule: VFR
Wind Data
3 MPH
070° East
Cloud Level(s): Clear
Sunny on Today Today... Sunny, with a high near 76. Calm wind becoming south around 5 mph in the afternoon.
Mostly Clear on Tonight Tonight... Mostly clear, with a low around 56. South wind around 6 mph.
80% chance of thunderstorms Thursday Thursday... Showers and possibly a thunderstorm after 2pm. High near 78. South wind 6 to 10 mph, with gusts as high as 21 mph. 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 Thursday Night Thursday Night... Showers and thunderstorms before 11pm, then a chance of showers between 11pm and 2am. Low around 56. South wind 3 to 6 mph. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Sunny on Friday Friday... Sunny, with a high near 81. Calm wind becoming southwest 5 to 9 mph in the morning. Winds could gust as high as 20 mph.
Cloudy on Friday Night Friday Night... Partly cloudy, with a low around 59.
60% chance of Saturday Saturday... Showers likely, mainly after 2pm. Partly sunny, with a high near 73. Chance of precipitation is 60%.
60% chance of rain Saturday Night Saturday Night... Showers likely, mainly before 8pm. Mostly cloudy, with a low around 50. Chance of precipitation is 60%.
Mostly Sunny on Sunday Sunday... Mostly sunny, with a high near 68.
Mostly Clear on Sunday Night Sunday Night... Mostly clear, with a low around 46.
Sunny on Monday Monday... Sunny, with a high near 69.
Mostly Clear on Monday Night Monday Night... Mostly clear, with a low around 47.
Mostly Sunny on Tuesday Tuesday... Mostly sunny, with a high near 69.
Sun Almanac for South Mountain, Pennsylvania
Sunrise: 06:40 AM
Sunset: 7:38 PM
Civil Sunrise:06:13 AM
Civil Sunset: 8:06 PM
Nautical Sunrise: 05:40 AM
Nautical Sunset: 8:38 PM
Astro Sunrise: 05:06 AM
Astro Sunset: 9:12 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.