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Red Run Lake, PA Weather Forecast
Red Run Lake, PA Weather Forecast Date: 130 AM EDT Thu Aug 20 2026
The area/counties/county of: Franklin, including the city of Chambersburg.or toggle through each period.
Rest of Tonight... Mostly cloudy. Lows in the mid 60s. Light and variable winds.
Thursday... A chance of thunderstorms. Showers with highs in the upper 70s. Northeast winds around 5 mph, becoming north in the afternoon. Chance of rain near 100%.
Thursday Night... Mostly cloudy. A chance of showers in the evening. Patchy fog after midnight. Lows around 60. North winds around 5 mph. Chance of rain 40%.
Friday... Mostly sunny. Patchy fog in the morning. A chance of showers in the afternoon. Humid with highs around 80. Northeast winds around 5 mph. Chance of rain 30%.
Friday Night... Mostly cloudy with a 50% chance of showers. Patchy fog after midnight. Humid with lows in the lower 60s. East winds around 5 mph in the evening, becoming light and variable.
Saturday... Patchy fog in the morning. Partly sunny with a chance of showers in the morning, then mostly cloudy with showers likely with a chance of thunderstorms in the afternoon. Humid with highs in the lower 80s. Chance of rain 70%.
Saturday Night... Mostly cloudy in the evening, then becoming partly cloudy. A chance of thunderstorms. Showers likely, mainly in the evening. Humid with lows in the lower 60s. Chance of rain 70%.
Sunday... Mostly sunny. Humid with highs in the lower 80s.
Sunday Night... Mostly clear. Lows in the upper 50s.
Monday... Sunny. Highs in the upper 70s.
Monday Night... Mostly clear. Lows in the upper 50s.
Tuesday... Mostly sunny. Highs around 80.
Tuesday Night... Partly cloudy. Lows in the lower 60s.
POP = Probability of Precipitation
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