| National Weather Service Forecast for:
Mount Lebanon PA Issued by: National Weather Service Pittsburgh, PA |
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| Updated: 2:21 am EDT Aug 20, 2026 | ||||||||||||||||||
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| Overnight |
A chance of showers, then showers likely and possibly a thunderstorm after 5am. Mostly cloudy, with a low around 65. Calm wind. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms. |
| Thursday |
Showers and possibly a thunderstorm before 1pm, then a chance of showers and thunderstorms, mainly between 1pm and 5pm. High near 75. Calm wind becoming north around 5 mph in the afternoon. Chance of precipitation is 90%. New rainfall amounts between three quarters and one inch possible. |
| Thursday Night |
Partly cloudy, with a low around 62. Northeast wind around 6 mph. |
| Friday |
A chance of showers and thunderstorms, mainly after 3pm. Mostly sunny, with a high near 79. East wind around 6 mph. Chance of precipitation is 30%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms. |
| Friday Night |
A slight chance of showers and thunderstorms before 8pm, then a slight chance of showers between 8pm and 2am. Patchy fog after 3am. Otherwise, partly cloudy, with a low around 64. East wind around 5 mph becoming calm in the evening. Chance of precipitation is 20%. |
| Saturday |
A chance of showers and thunderstorms after 2pm. Patchy fog before 7am. Otherwise, partly sunny, with a high near 80. Chance of precipitation is 40%. |
| Saturday Night |
A chance of showers and thunderstorms before 8pm, then a chance of showers between 8pm and 2am. Mostly cloudy, with a low around 62. Chance of precipitation is 40%. |
| Sunday |
A chance of showers after 2pm. Partly sunny, with a high near 75. Chance of precipitation is 30%. |
| Sunday Night |
A chance of showers before 8pm. Partly cloudy, with a low around 58. Chance of precipitation is 30%. |
| Monday |
Sunny, with a high near 75. |
| Monday Night |
Mostly clear, with a low around 58. |
| Tuesday |
Mostly sunny, with a high near 78. |
| Tuesday Night |
Partly cloudy, with a low around 60. |
| Wednesday |
Mostly sunny, with a high near 80. |
Forecast from NOAA-NWS for Mount Lebanon PA.