Louisville · August
Run in the pre-dawn.
Average high is 85°F with a 68°F overnight low. Humidity averages 76% — the limiting factor on most runs. Humid heat punishes mid-morning — get out before sunrise for the only truly comfortable window.
Avg high / low
85° / 68°F
Humidity
76%
Rain days
15/mo
Wind
8 mph
What August feels like in Louisville
Sunrise
06:58
Mid-month average
Sunset
20:34
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
Heat peaks here. Skip unless you've got shade and pace tolerance.
Evening
Cools off after sunset but still warm. Good for easy efforts; avoid hard intervals if you're chasing pace.
What to wear running in Louisville in August
The kit for August in Louisville: light, breathable, and moisture-wicking — singlet or short-sleeve only, a water-resistant cap or jacket on standby.
August vs the surrounding months
vs July
-1° avg high
-3 rain days
Louisville in July →
August
85°F avg high
15 rain days
Best: pre-dawn
vs September
+4° avg high
+5 rain days
Louisville in September →
Frequently Asked Questions
What is the best time of day to run in Louisville in August?+
Pre-dawn. Humid heat punishes mid-morning — get out before sunrise for the only truly comfortable window.
What's the average temperature in Louisville in August?+
Average high 85°F, average low 68°F.
How does August compare to surrounding months in Louisville?+
Compared to July (avg high 87°F), August is cooler. Compared to September (avg high 81°F), August is warmer.
Does it rain often in Louisville in August?+
Expect about 15 measurable rain days in August, on average.