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Keystone Lake, PA Weather Forecast
Keystone Lake, PA Weather Forecast Date: 1217 AM EDT Fri Aug 28 2026
The area/counties/county of: Westmoreland, including the cities of: Murrysville, Greensburg, New Kensington, Lower Burrell, Latrobe, and Monessen.or toggle through each period.
Overnight... Mostly cloudy. Areas of fog. Lows in the lower 60s. Light and variable winds.
Today... Areas of fog in the morning. Partly cloudy. Humid with highs in the upper 70s. North winds around 5 mph.
Tonight... Mainly clear. Patchy fog after midnight. Lows in the mid 50s. North winds around 5 mph.
Saturday... Patchy fog in the morning. Mostly sunny. Highs in the lower 80s. Northeast winds around 5 mph.
Saturday Night... Mainly clear. Patchy fog after midnight. Lows in the lower 60s. Northeast winds around 5 mph, becoming southeast after midnight.
Sunday... Mostly sunny. Highs in the mid 80s.
Sunday Night... Partly cloudy in the evening, then becoming mostly cloudy. Lows in the upper 60s.
Monday... Partly sunny. Highs in the upper 80s.
Monday Night... Mostly cloudy. Lows around 70.
Tuesday... Partly sunny. Highs in the upper 80s. Heat index values in the mid 90s in the afternoon.
Tuesday Night... Mostly cloudy. Lows around 70.
Wednesday... Partly sunny with a chance of showers. A chance of thunderstorms in the afternoon. Highs in the upper 80s. Chance of rain 50%.
Wednesday Night... A chance of thunderstorms in the evening. Mostly cloudy with a chance of showers. Lows in the upper 60s. Chance of rain 50%.
POP = Probability of Precipitation
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