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Williamson, PA Weather Forecast
Williamson, PA Weather Forecast Date: 730 PM EDT Sat Sep 19 2026
The area/counties/county of: Franklin, including the city of Chambersburg.or toggle through each period.
Tonight... Mostly cloudy. A slight chance of showers this evening, then a chance of showers after midnight. Lows in the lower 60s. Southeast winds 5 to 10 mph. Gusts up to 25 mph after midnight. Chance of rain 50%.
Sunday... Showers. A chance of thunderstorms in the afternoon. Humid with highs in the lower 80s. South winds 5 to 10 mph with gusts up to 25 mph. Chance of rain near 100%.
Sunday Night... Mostly cloudy. A chance of showers and thunderstorms in the evening. Humid with lows in the mid 50s. Northwest winds around 5 mph, becoming north with gusts up to 20 mph after midnight. Chance of rain 50%.
Monday... Partly sunny in the morning, then mostly cloudy with a chance of showers in the afternoon. Not as warm with highs around 70. Northeast winds 5 to 10 mph. Chance of rain 40%.
Monday Night... Mostly cloudy. A chance of showers in the evening, then showers likely after midnight. Lows in the lower 50s. Northeast winds 5 to 10 mph. Chance of rain 70%.
Tuesday... Showers likely. Highs in the lower 60s. Chance of rain 70%.
Tuesday Night... Cloudy. Showers likely, mainly in the evening. Lows around 50. Chance of rain 70%.
Wednesday... Mostly cloudy with a 50% chance of showers. Highs in the upper 50s.
Wednesday Night... Mostly cloudy with a 40% chance of showers. Lows around 50.
Thursday... Mostly cloudy. A chance of showers in the morning. Highs around 60. Chance of rain 30%.
Thursday Night... Mostly cloudy. Lows in the upper 40s.
Friday... Partly sunny. A chance of showers in the afternoon. Highs in the mid 60s. Chance of rain 30%.
Friday Night... Mostly cloudy. A chance of showers in the evening. Lows in the upper 40s. Chance of rain 30%.
POP = Probability of Precipitation
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