Louisville weather in September
September in Louisville: warm, a little rain, with clean air — one of the best months to visit.
#2 of 12 months in Louisville · #206 of 897 destinations to visit in September · comfort 89/100 (tier A)
Updated June 2026 · climate normals from ERA5 reanalysis
Traveller notes on Louisville in September
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Louisville climate normals — September
| Daytime high | 28°C / 82°F | 🌤 warm |
|---|---|---|
| Nighttime low | 17°C / 63°F | |
| Rainfall | 63 mm / 2.5 in | 🌦 some rain |
| Rainy days | 7 days | |
| Humidity | 69% | 💧 humid |
| Dew point | 15°C / 59°F | |
| Sunshine | 10.3 h/day | |
| Daylight | 12.4 h | |
| Wind | 12 km/h / 7 mph | |
| Air quality (US AQI) | 43 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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Louisville in September — FAQ
- Is September a good time to visit Louisville?
- September in Louisville: warm, a little rain, with clean air — one of the best months to visit. It ranks #2 of 12 months for Louisville on SeasonMap's comfort score (89/100).
- What is the weather like in Louisville in September?
- In September, Louisville averages a daily high of 27.5°C and a low of 17.4°C, with about 62.9 mm of rain over roughly 6.6 rainy days.
- What is the air quality in Louisville in September?
- Louisville has a mean US Air Quality Index of about 43 in September.