Cincinnati · September
Run in the morning.
Comfortable average high of 79°F, dipping to 61°F at night. Humidity rises with the sun — morning runs catch the driest, coolest window.
Avg high / low
79° / 61°F
Humidity
70%
Rain days
11/mo
Wind
8 mph
What September feels like in Cincinnati
Sunrise
07:20
Mid-month average
Sunset
19:45
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 Cincinnati in September
The kit for September in Cincinnati: shorts and a short-sleeve are the standard kit.
September vs the surrounding months
vs August
-4° avg high
-6 rain days
Cincinnati in August →
September
79°F avg high
11 rain days
Best: morning
vs October
+12° avg high
-2 rain days
Cincinnati in October →
Frequently Asked Questions
What is the best time of day to run in Cincinnati in September?+
Morning. Humidity rises with the sun — morning runs catch the driest, coolest window.
What's the average temperature in Cincinnati in September?+
Average high 79°F, average low 61°F.
How does September compare to surrounding months in Cincinnati?+
Compared to August (avg high 84°F), September is cooler. Compared to October (avg high 67°F), September is warmer.
Does it rain often in Cincinnati in September?+
Expect about 11 measurable rain days in September, on average.