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Pittsburgh-Monroeville Weather Forecast
| TONIGHT | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY | THURSDAY NIGHT | FRIDAY | FRIDAY NIGHT | SATURDAY | SATURDAY NIGHT | SUNDAY | SUNDAY NIGHT | MONDAY |
 |  |  | |  |  |  | | | | | |
| Patchy Fog | Chance of T-Storm | Chance of T-Storm | Chance of T-Storm | Chance of Showers | Mostly Sunny | Clear | Chance of T-Storm | Chance of T-Storm | Chance of T-Storm | Chance of T-Storm | Mostly Sunny |
| Lo: 61°FLo: 16°C | Hi: 80°FHi: 27°C | Lo: 61°FLo: 16°C | Hi: 79°FHi: 26°C | Lo: 59°FLo: 15°C | Hi: 80°FHi: 27°C | Lo: 61°FLo: 16°C | Hi: 80°FHi: 27°C | Lo: 61°FLo: 16°C | Hi: 75°FHi: 24°C | Lo: 59°FLo: 15°C | Hi: 79°FHi: 26°C |
| POP: 20% | POP: 50% | POP: 50% | POP: 50% | POP: 70% | POP: 70% | POP: 40% | POP: 40% |
POP = Probability of Precipitation.
Weather Outlook Updated: 658 PM EDT Tue Aug 18 2026 
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Pittsburgh-Monroeville Forecast Discussion
Issued: 730 PM EDT Tue Aug 18 2026
Key Messages
1) New disturbance late tomorrow into early Thursday could return heavy rain potential for portions of the region
2) Rain and thunderstorm chances return Saturday into Sunday with a passing trough
Discussion
... KEY MESSAGE 1... Expect showers and thunderstorms to return from late tomorrow afternoon into early Thursday morning as a trough develops over the Great Lakes and Ohio River Valley. With a zonal westerly flow in place aloft, development will depend ...