National Weather Service Forecast for: Mount Lebanon PA
Issued by: National Weather Service Pittsburgh, PA
Updated: 5:21 am EDT Jun 22, 2026
 
Overnight

Overnight: Showers and possibly a thunderstorm. Low around 62. East wind around 10 mph. Chance of precipitation is 80%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Showers

 Monday

Monday: Showers and thunderstorms, mainly before 3pm, then showers and possibly a thunderstorm after 3pm. High near 76. Southeast wind 11 to 13 mph becoming southwest in the afternoon. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.
Showers then
T-storms

 Monday
Night
Monday Night: Showers and possibly a thunderstorm before 8pm, then a slight chance of showers and thunderstorms between 8pm and 10pm. Low around 58. North wind around 9 mph. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Showers then
Mostly Cloudy

 Tuesday

Tuesday: Mostly cloudy, then gradually becoming sunny, with a high near 76. Northwest wind 9 to 11 mph.
Decreasing
Clouds

 Tuesday
Night
Tuesday Night: Mostly clear, with a low around 54. Northwest wind 5 to 8 mph becoming calm after midnight.
Mostly Clear

 Wednesday

Wednesday: Sunny, with a high near 78.
Sunny

 Wednesday
Night
Wednesday Night: Partly cloudy, with a low around 61.
Partly Cloudy

 Thursday

Thursday: A chance of showers, with thunderstorms also possible after 2pm. Partly sunny, with a high near 82. Chance of precipitation is 30%.
Chance
Showers then
Chance
T-storms
 Thursday
Night
Thursday Night: A chance of showers and thunderstorms. Mostly cloudy, with a low around 63. Chance of precipitation is 50%.
Chance
T-storms
Lo 62 °F Hi 76 °F Lo 58 °F Hi 76 °F Lo 54 °F Hi 78 °F Lo 61 °F Hi 82 °F Lo 63 °F

Hazardous Weather Outlook
 

Overnight
 
 Showers and possibly a thunderstorm. Low around 62. East wind around 10 mph. Chance of precipitation is 80%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Monday
 
 Showers and thunderstorms, mainly before 3pm, then showers and possibly a thunderstorm after 3pm. High near 76. Southeast wind 11 to 13 mph becoming southwest in the afternoon. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.
Monday Night
 
 Showers and possibly a thunderstorm before 8pm, then a slight chance of showers and thunderstorms between 8pm and 10pm. Low around 58. North wind around 9 mph. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Tuesday
 
 Mostly cloudy, then gradually becoming sunny, with a high near 76. Northwest wind 9 to 11 mph.
Tuesday Night
 
 Mostly clear, with a low around 54. Northwest wind 5 to 8 mph becoming calm after midnight.
Wednesday
 
 Sunny, with a high near 78.
Wednesday Night
 
 Partly cloudy, with a low around 61.
Thursday
 
 A chance of showers, with thunderstorms also possible after 2pm. Partly sunny, with a high near 82. Chance of precipitation is 30%.
Thursday Night
 
 A chance of showers and thunderstorms. Mostly cloudy, with a low around 63. Chance of precipitation is 50%.
Friday
 
 A chance of showers and thunderstorms after 2pm. Partly sunny, with a high near 81. Chance of precipitation is 40%.
Friday Night
 
 A chance of showers and thunderstorms. Mostly cloudy, with a low around 62. Chance of precipitation is 30%.
Saturday
 
 A chance of showers and thunderstorms. Partly sunny, with a high near 81. Chance of precipitation is 30%.
Saturday Night
 
 A chance of showers and thunderstorms. Mostly cloudy, with a low around 63. Chance of precipitation is 30%.
Sunday
 
 A chance of showers. Partly sunny, with a high near 84. Chance of precipitation is 30%.

 

Forecast from NOAA-NWS for Mount Lebanon PA.