Pittsburgh (PA)
September
Weather in Pittsburgh, Pennsylvania for September 2026
Your guide to Pittsburgh weather in September - trends and predictions
In general, the average temperature in Pittsburgh at the beginning of September is 26.9 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 23.1 °C 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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Temperatures
Rain 🌧️
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15
Dry days
15
Rainy days
0
Snow days
25°/14°
Temperatures
11 km/h
Avg max wind
68 %
Avg humidity
Pittsburgh Weather September
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Temperatures trend during September in Pittsburgh
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September weather in Pittsburgh day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Sept. 1 |  Sunny | 27° /13° | 0 mm | 6 | |
| Sept. 2 |  Mist | 26° /12° | 0 mm | 6 | |
| Sept. 3 |  Overcast | 27° /13° | 0 mm | 6 | |
| Sept. 4 |  Thundery outbreaks possible | 27° /15° | 20.7 mm | 6 | |
| Sept. 5 |  Partly cloudy | 30° /15° | 0 mm | 7 | |
| Sept. 6 | Thundery outbreaks possible | 28° /16° | 21.8 mm | 7 | |
| Sept. 7 |  Light rain shower | 23° /13° | 4 mm | 5 | |
| Sept. 8 | Overcast | 23° /10° | 0 mm | 6 | |
| Sept. 9 | Partly cloudy | 25° /11° | 0.8 mm | 6 | |
| Sept. 10 | Sunny | 27° /12° | 5.3 mm | 7 | |
| Sept. 11 | Mist | 27° /13° | 0 mm | 6 | |
| Sept. 12 | Mist | 28° /14° | 0 mm | 7 | |
| Sept. 13 | Overcast | 25° /14° | 1.9 mm | 6 | |
| Sept. 14 | Mist | 27° /14° | 0 mm | 7 | |
| Sept. 15 | Sunny | 27° /13° | 0 mm | 6 | |
| Sept. 16 | Overcast | 25° /12° | 0 mm | 5 | |
| Sept. 17 | Overcast | 21° /14° | 4.9 mm | 5 | |
| Sept. 18 |  Patchy light rain with thunder | 24° /14° | 0.3 mm | 5 | |
| Sept. 19 | Overcast | 25° /15° | 0.4 mm | 5 | |
| Sept. 20 |  Cloudy | 26° /13° | 0 mm | 6 | |
| Sept. 21 | Partly cloudy | 27° /16° | 3.6 mm | 6 | |
| Sept. 22 | Partly cloudy | 27° /15° | 0.5 mm | 6 | |
| Sept. 23 |  Moderate or heavy rain shower | 23° /15° | 32.5 mm | 5 | |
| 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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Important Notice
Our weather forecast for Pittsburgh in September is based on the analysis of historical data rather than real-time forecast models. While this provides a general overview, weather conditions can change. We recommend that you check the Pittsburgh forecast closer to your planned date for the most up-to-date weather information.
Change Month
Pittsburgh in September - FAQ
What are the expected maximum and minimum temperatures in Pittsburgh during September?
Enjoy moderate daytime temperatures of up to 25° and cooler nights around 14°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in Pittsburgh during September?
Significant rainfall exceeding 138.5 mm is expected in Pittsburgh during September, occurring over more than 15 days. Preparing for wet conditions is recommended in your planning.
What are the typical wind conditions in Pittsburgh during September?
The average wind speed in Pittsburgh during September is 11 km/h, suggesting breezy to windy conditions, depending on your activities.
September rainfall patterns in Pittsburgh
Explore the daily rainfall trends and prepare for Pittsburghs September weather 💧
Typically, Pittsburgh has 15 rainy days in September with a total of 138.5 mm of rainfall.
UV exposure in Pittsburgh during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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