National Weather Service Forecast for: Mount Lebanon PA
Issued by: National Weather Service Pittsburgh, PA
Updated: 6:46 pm EDT Jun 18, 2026
 
Tonight

Tonight: Mostly cloudy, with a low around 58. West wind 5 to 10 mph.
Mostly Cloudy

 Juneteenth

Juneteenth: Mostly sunny, with a high near 76. West wind 5 to 14 mph.
Mostly Sunny

 Friday
Night
Friday Night: Mostly clear, with a low around 57. West wind 7 to 10 mph.
Mostly Clear

 Saturday

Saturday: Sunny, with a high near 76. West wind 8 to 14 mph.
Sunny

 Saturday
Night
Saturday Night: Partly cloudy, with a low around 59. Southwest wind 5 to 8 mph.
Partly Cloudy

 Sunday

Sunday: Mostly sunny, with a high near 80.
Mostly Sunny

 Sunday
Night
Sunday Night: Showers likely, mainly after 2am. Mostly cloudy, with a low around 62. Chance of precipitation is 70%.
Chance
Showers then
Showers
Likely
 Monday

Monday: Showers, with thunderstorms also possible after 2pm. High near 76. Chance of precipitation is 80%.
Showers

 Monday
Night
Monday Night: Showers likely and possibly a thunderstorm before 8pm, then a chance of showers between 8pm and 2am. Mostly cloudy, with a low around 59. Chance of precipitation is 60%.
Showers
Likely
Lo 58 °F Hi 76 °F Lo 57 °F Hi 76 °F Lo 59 °F Hi 80 °F Lo 62 °F Hi 76 °F Lo 59 °F

 

Tonight
 
 Mostly cloudy, with a low around 58. West wind 5 to 10 mph.
Juneteenth
 
 Mostly sunny, with a high near 76. West wind 5 to 14 mph.
Friday Night
 
 Mostly clear, with a low around 57. West wind 7 to 10 mph.
Saturday
 
 Sunny, with a high near 76. West wind 8 to 14 mph.
Saturday Night
 
 Partly cloudy, with a low around 59. Southwest wind 5 to 8 mph.
Sunday
 
 Mostly sunny, with a high near 80.
Sunday Night
 
 Showers likely, mainly after 2am. Mostly cloudy, with a low around 62. Chance of precipitation is 70%.
Monday
 
 Showers, with thunderstorms also possible after 2pm. High near 76. Chance of precipitation is 80%.
Monday Night
 
 Showers likely and possibly a thunderstorm before 8pm, then a chance of showers between 8pm and 2am. Mostly cloudy, with a low around 59. Chance of precipitation is 60%.
Tuesday
 
 Mostly sunny, with a high near 76.
Tuesday Night
 
 Partly cloudy, with a low around 58.
Wednesday
 
 Mostly sunny, with a high near 78.
Wednesday Night
 
 Partly cloudy, with a low around 59.
Thursday
 
 A chance of showers and thunderstorms. Mostly sunny, with a high near 78. Chance of precipitation is 40%.

 

Forecast from NOAA-NWS for Mount Lebanon PA.