Pittsburgh · September
Run in the morning.
Comfortable average high of 77°F, dipping to 59°F at night. Humidity rises with the sun — morning runs catch the driest, coolest window.
Avg high / low
77° / 59°F
Humidity
75%
Rain days
14/mo
Wind
9 mph
What September feels like in Pittsburgh
Sunrise
07:01
Mid-month average
Sunset
19:28
Mid-month average
Time-of-day breakdown
Morning
Coolest, driest air of the day. The window before sunrise is the most reliable comfortable hour.
Midday
Mild but UV and traffic peak. Workable if you don't mind shifting your pace.
Evening
Warm and runnable. Crowded routes but the air's typically calm.
What to wear running in Pittsburgh in September
The kit for September in Pittsburgh: shorts and a short-sleeve are the standard kit, a water-resistant cap or jacket on standby.
September vs the surrounding months
vs August
-5° avg high
-4 rain days
Pittsburgh in August →
September
77°F avg high
14 rain days
Best: morning
vs October
+12° avg high
-1 rain days
Pittsburgh in October →
Frequently Asked Questions
What is the best time of day to run in Pittsburgh in September?+
Morning. Humidity rises with the sun — morning runs catch the driest, coolest window.
What's the average temperature in Pittsburgh in September?+
Average high 77°F, average low 59°F.
How does September compare to surrounding months in Pittsburgh?+
Compared to August (avg high 82°F), September is cooler. Compared to October (avg high 65°F), September is warmer.
Does it rain often in Pittsburgh in September?+
Expect about 14 measurable rain days in September, on average.