Louisville · September
Run in the morning.
Comfortable average high of 81°F, dipping to 63°F at night. Humidity rises with the sun — morning runs catch the driest, coolest window.
Avg high / low
81° / 63°F
Humidity
72%
Rain days
9/mo
Wind
8 mph
What September feels like in Louisville
Sunrise
07:25
Mid-month average
Sunset
19:50
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 Louisville in September
The kit for September in Louisville: shorts and a short-sleeve are the standard kit.
September vs the surrounding months
vs August
-4° avg high
-5 rain days
Louisville in August →
September
81°F avg high
9 rain days
Best: morning
vs October
+12° avg high
-2 rain days
Louisville in October →
Frequently Asked Questions
What is the best time of day to run in Louisville in September?+
Morning. Humidity rises with the sun — morning runs catch the driest, coolest window.
What's the average temperature in Louisville in September?+
Average high 81°F, average low 63°F.
How does September compare to surrounding months in Louisville?+
Compared to August (avg high 85°F), September is cooler. Compared to October (avg high 69°F), September is warmer.
Does it rain often in Louisville in September?+
Expect about 9 measurable rain days in September, on average.