Weather in Pittsburgh, Pennsylvania for September 2026
Flash Flood Warning - See hour by hour.
So far, September 2026 in Pittsburgh shows a warmer trend than usual by 2.9 °F.
Expect cooler weather in the next days in Pittsburgh with the forecast suggesting a temperature of 24.1 °F, lower than the historical average.
In general, the average temperature in Pittsburgh at the beginning of September is 27.9 °F. As the month progressed, temperatures tended to significantly cool down, reaching an average of 23.1 °F by the end of September.
The climate of Pittsburgh in September is notably wet, with an average of 15 rainy days, and a total of 138.5 mm of precipitation.
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Pittsburgh Weather September
Temperatures trend during September in Pittsburgh
September weather in Pittsburgh day by day
| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Sept. 1 |  Sunny | 29° /15° | 0 mm | 6 | |
| Sept. 2 | Sunny | 28° /14° | 0 mm | 7 | |
| Sept. 3 | Sunny | 30° /16° | 0.1 mm | 7 | |
| Sept. 4 |  Thundery outbreaks possible | 27° /16° | 15.6 mm | 6 | |
| Sept. 5 |  Partly cloudy | 29° /16° | 0.1 mm | 7 | |
| Sept. 6 | Sunny | 28° /15° | 16.3 mm | 7 | |
| Sept. 7 |  Light rain shower | 24° /13° | 3 mm | 6 | |
| Sept. 8 |  Overcast | 24° /11° | 0 mm | 6 | |
| Sept. 9 | Partly cloudy | 27° /13° | 2.4 mm | 5 | |
| Sept. 10 | Light rain shower | 24° /18° | 122.3 mm | 5.4 | |
| Sept. 11 | Overcast | 25° /17° | 0.3 mm | 6.6 | |
| Sept. 12 | Overcast | 21° /19° | 5.1 mm | 4.1 | |
| Sept. 13 |  Fog | 28° /19° | 0.3 mm | 6.5 | |
| Sept. 14 | Overcast | 29° /19° | 0 mm | 6 | |
| Sept. 15 | Sunny | 31° /22° | 2.2 mm | 8 | |
| Sept. 16 | Partly cloudy | 25° /17° | 0.6 mm | 6 | |
| Sept. 17 | Light rain shower | 27° /15° | 14.7 mm | 6 | |
| Sept. 18 | Light rain shower | 23° /15° | 15.3 mm | 5 | |
| Sept. 19 | Sunny | 17° /10° | 0.3 mm | 5 | |
| Sept. 20 | Sunny | 19° /9° | 0 mm | 5 | |
| Sept. 21 | Sunny | 21° /11° | 0 mm | 6 | |
| Sept. 22 | Sunny | 24° /15° | 0 mm | 6 | |
| Sept. 23 | Sunny | 24° /16° | 0 mm | 6 | |
| Sept. 24 |  Light drizzle | 22° /16° | 10.8 mm | 5 | |
| Sept. 25 | Patchy rain possible | 23° /16° | 7.4 mm | 5 | |
| Sept. 26 | Overcast | 23° /15° | 1 mm | 5 | |
| Sept. 27 | Overcast | 24° /14° | 2.6 mm | 5 | |
| Sept. 28 | Light rain shower | 23° /14° | 3 mm | 5 | |
| Sept. 29 | Fog | 24° /15° | 0.9 mm | 5 | |
| Sept. 30 | Mist | 23° /13° | 16.2 mm | 5 | |
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Pittsburgh in September - FAQ
What are the expected maximum and minimum temperatures in Pittsburgh during September?
How much rainfall should be expected in Pittsburgh during September?
What are the typical wind conditions in Pittsburgh during September?
September rainfall patterns in Pittsburgh
UV exposure in Pittsburgh during September
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