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South Mountain, PA Weather Forecast
South Mountain, PA Weather Forecast Date: 1200 PM EDT Tue Sep 29 2026
The area/counties/county of: Franklin, including the city of Chambersburg.or toggle through each period.
Today... Patchy fog this morning. Mostly cloudy. Highs in the lower 70s. Northwest winds around 5 mph.
Tonight... Partly cloudy. Patchy fog after midnight. Lows in the mid 50s. Light and variable winds.
Wednesday... Areas of fog in the morning. Mostly sunny. Highs in the upper 70s. South winds around 5 mph.
Wednesday Night... Mostly cloudy. Lows in the upper 50s. South winds around 5 mph in the evening, becoming light and variable.
Thursday... Mostly sunny. Highs in the lower 80s. Southwest winds around 5 mph.
Thursday Night... Mostly clear in the evening, then becoming partly cloudy. Lows around 60.
Friday... Mostly sunny. Highs in the mid 80s.
Friday Night... Mostly cloudy. A chance of showers after midnight. Lows in the upper 50s. Chance of rain 40%.
Saturday... Mostly cloudy with a 50% chance of showers. Not as warm with highs around 70.
Saturday Night... Mostly cloudy. A chance of showers in the evening, then showers likely after midnight. Lows in the mid 50s. Chance of rain 60%.
Sunday... Showers likely. Highs in the upper 60s. Chance of rain 60%.
Sunday Night... Mostly cloudy. A chance of showers in the evening. Lows in the upper 40s. Chance of rain 50%.
POP = Probability of Precipitation
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