Pittsburgh
September
Weather in Pittsburgh for September 2025
Your guide to Pittsburgh weather in September - trends and predictions
In general, the average temperature in Pittsburgh at the beginning of September is 28.7 °F. As the month progressed, temperatures tended to significantly cool down, reaching an average of 22.4 °F by the end of September.
Pittsburgh sees moderate rainfall in September, averaging 9 rainy days.
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Temperatures
Rain 🌧️
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21
Dry days
9
Rainy days
0
Snow days
25°/13°
Temperatures
11 km/h
Avg max wind
70 %
Avg humidity
Pittsburgh in September average weather
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| Mon. | Tue. | Wed. | Thu. | Fri. | Sat. | Sun. |
|---|---|---|---|---|---|---|
| 1  28° | 2  26° | 3  29° | 4  30° | 5  31° | 6 32° | 7  25° |
| 8 24° | 9 26° | 10 28° | 11 29° | 12 28° | 13 25° | 14 25° |
| 15 26° | 16 24° | 17 20° | 18  22° | 19 23° | 20  27° | 21 28° |
| 22 27° | 23 22° | 24  21° | 25 24° | 26 23° | 27 24° | 28 21° |
| 29 24° | 30 20° |
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Temperatures trend during September in Pittsburgh
See the weather trend as well as the moving average line
September weather day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Sept. 1 | Sunny | 28° /14° | 0 mm | 7 | |
| Sept. 2 | Mist | 26° /11° | 0 mm | 7 | |
| Sept. 3 | Overcast | 29° /13° | 0 mm | 7 | |
| Sept. 4 | Thundery outbreaks possible | 30° /15° | 0 mm | 7 | |
| Sept. 5 | Partly cloudy | 31° /16° | 0 mm | 8 | |
| Sept. 6 | Thundery outbreaks possible | 32° /16° | 0.2 mm | 8 | |
| Sept. 7 | Light rain shower | 25° /14° | 6 mm | 6 | |
| Sept. 8 | Overcast | 24° /11° | 0 mm | 6 | |
| Sept. 9 | Mist | 26° /12° | 1.2 mm | 6 | |
| Sept. 10 | Light rain shower | 28° /13° | 7.9 mm | 7 | |
| Sept. 11 | Mist | 29° /14° | 0 mm | 7 | |
| Sept. 12 | Mist | 28° /15° | 0 mm | 7 | |
| Sept. 13 | Fog | 25° /13° | 2.8 mm | 6 | |
| Sept. 14 | Mist | 25° /12° | 0 mm | 6 | |
| Sept. 15 | Sunny | 26° /11° | 0 mm | 7 | |
| Sept. 16 | Overcast | 24° /10° | 0 mm | 5 | |
| Sept. 17 | Overcast | 20° /13° | 7.3 mm | 5 | |
| Sept. 18 | Patchy light rain with thunder | 22° /12° | 0.4 mm | 5 | |
| Sept. 19 | Overcast | 23° /14° | 0 mm | 5 | |
| Sept. 20 | Cloudy | 27° /12° | 0 mm | 6 | |
| Sept. 21 | Partly cloudy | 28° /17° | 5.4 mm | 7 | |
| Sept. 22 | Partly cloudy | 27° /15° | 0 mm | 7 | |
| Sept. 23 | Overcast | 22° /14° | 9.5 mm | 5 | |
| Sept. 24 | Light drizzle | 21° /15° | 12.4 mm | 5 | |
| Sept. 25 | Patchy rain possible | 24° /15° | 5.1 mm | 6 | |
| Sept. 26 | Overcast | 23° /14° | 1.5 mm | 6 | |
| Sept. 27 | Overcast | 24° /16° | 3.8 mm | 6 | |
| Sept. 28 | Light rain shower | 21° /14° | 4.5 mm | 5 | |
| Sept. 29 | Light rain shower | 24° /16° | 1.4 mm | 5 | |
| Sept. 30 | Mist | 20° /13° | 24.3 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.
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 13°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in Pittsburgh during September?
In September, Pittsburgh can expect light to moderate rainfall, totaling 38.5 mm across approximately 9 days. Occasional showers are possible, and planning ahead for them could be helpful.
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 💧
UV exposure in Pittsburgh during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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