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Washington County, PA Weather Forecast
Washington County, PA Weather Forecast Date: 802 PM EDT Mon Aug 17 2026
The area/counties/county of: Washington, including the cities of: Washington and Canonsburg.or toggle through each period.
Rest of Tonight... Partly cloudy early this evening, then becoming mostly cloudy. Patchy fog early this evening, then areas of fog. Lows in the lower 60s. North winds around 5 mph.
Tuesday... Areas of fog in the morning. Partly cloudy. Highs in the upper 70s. Northwest winds around 5 mph.
Tuesday Night... Mainly clear. Lows around 60. West winds around 5 mph, becoming southwest after midnight.
Wednesday... Partly cloudy in the morning, then partly sunny with a slight chance of showers and thunderstorms in the afternoon. Humid with highs in the upper 70s. Southwest winds 5 to 10 mph. Chance of rain 20%.
Wednesday Night... Mostly cloudy. A chance of showers in the evening, then showers likely after midnight. Humid with lows in the lower 60s. West winds 5 to 10 mph in the evening, becoming light and variable. Chance of rain 70%.
Thursday... Mostly cloudy with showers likely in the morning, then partly sunny with a chance of showers and thunderstorms in the afternoon. Highs in the mid 70s. Chance of rain 70%.
Thursday Night... Partly cloudy. A chance of showers and thunderstorms in the evening. Lows in the upper 50s. Chance of rain 50%.
Friday... Mostly sunny. Highs in the upper 70s.
Friday Night... Mainly clear. Lows in the lower 60s.
Saturday... Partly cloudy in the morning, then partly sunny with a chance of showers in the afternoon. Highs in the upper 70s. Chance of rain 50%.
Saturday Night... Mostly cloudy with a chance of showers. Lows around 60. Chance of rain 50%.
Sunday... Partly cloudy in the morning, then partly sunny with a chance of showers and thunderstorms in the afternoon. Highs in the mid 70s. Chance of rain 50%.
Sunday Night... Partly cloudy. A chance of showers and thunderstorms in the evening. Lows in the upper 50s. Chance of rain 50%.
POP = Probability of Precipitation
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