Louisville, Kentucky weather in September

Averages from 2021–2025 (150 days of record).

Average high: 81°F
Average low: 62°F
Rainy days: ~8 per month
Total precipitation: 3.7 in
Warmest recorded: 95°F
Coldest recorded: 46°F

Expect September days in Louisville, Kentucky to top out around 81°F and cool to about 62°F overnight, with roughly 8 days of measurable rain across the month. In recent years September has ranged from 46°F to 95°F.

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Current Louisville, Kentucky forecast → · Historical data by Open-Meteo (ERA5).