National Weather Service Forecast for: Mount Lebanon PA
Issued by: National Weather Service Pittsburgh, PA
Updated: 4:11 am EDT Jun 30, 2026
 
Today

Today: Mostly sunny and hot, with a high near 92. Heat index values as high as 100. Southwest wind 5 to 10 mph.
Hot

 Tonight

Tonight: Partly cloudy, with a low around 75. Southwest wind 5 to 7 mph.
Partly Cloudy

 Wednesday

Wednesday: Sunny and hot, with a high near 96. Heat index values as high as 104. West wind 6 to 8 mph.
Hot

 Wednesday
Night
Wednesday Night: Mostly clear, with a low around 75. Southwest wind 3 to 5 mph.
Mostly Clear

 Thursday

Thursday: Sunny and hot, with a high near 98. Calm wind becoming southwest 5 to 9 mph in the afternoon.
Hot

 Thursday
Night
Thursday Night: Mostly clear, with a low around 76.
Mostly Clear

 Friday

Friday: A chance of showers and thunderstorms after 2pm. Mostly sunny and hot, with a high near 96. Chance of precipitation is 30%.
Sunny then
Chance
T-storms
 Friday
Night
Friday Night: A chance of showers and thunderstorms before 2am. Mostly cloudy, with a low around 74. Chance of precipitation is 30%.
Chance
T-storms
 Independence
Day
Independence Day: A chance of showers and thunderstorms after 2pm. Partly sunny and hot, with a high near 91. Chance of precipitation is 50%.
Mostly Sunny
then Chance
T-storms
Hi 92 °F Lo 75 °F Hi 96 °F Lo 75 °F Hi 98 °F Lo 76 °F Hi 96 °F Lo 74 °F Hi 91 °F

Heat Advisory
Hazardous Weather Outlook
 

Today
 
 Mostly sunny and hot, with a high near 92. Heat index values as high as 100. Southwest wind 5 to 10 mph.
Tonight
 
 Partly cloudy, with a low around 75. Southwest wind 5 to 7 mph.
Wednesday
 
 Sunny and hot, with a high near 96. Heat index values as high as 104. West wind 6 to 8 mph.
Wednesday Night
 
 Mostly clear, with a low around 75. Southwest wind 3 to 5 mph.
Thursday
 
 Sunny and hot, with a high near 98. Calm wind becoming southwest 5 to 9 mph in the afternoon.
Thursday Night
 
 Mostly clear, with a low around 76.
Friday
 
 A chance of showers and thunderstorms after 2pm. Mostly sunny and hot, with a high near 96. Chance of precipitation is 30%.
Friday Night
 
 A chance of showers and thunderstorms before 2am. Mostly cloudy, with a low around 74. Chance of precipitation is 30%.
Independence Day
 
 A chance of showers and thunderstorms after 2pm. Partly sunny and hot, with a high near 91. Chance of precipitation is 50%.
Saturday Night
 
 A chance of showers and thunderstorms before 2am. Mostly cloudy, with a low around 71. Chance of precipitation is 30%.
Sunday
 
 A chance of showers and thunderstorms. Partly sunny, with a high near 89. Chance of precipitation is 40%.
Sunday Night
 
 A chance of showers and thunderstorms. Mostly cloudy, with a low around 70. Chance of precipitation is 40%.
Monday
 
 A chance of showers and thunderstorms. Partly sunny, with a high near 87. Chance of precipitation is 50%.

 

Forecast from NOAA-NWS for Mount Lebanon PA.