Kentucky → Louisville → How humid does it get during the summer months?

How humid does it get during the summer months?

Question & Answer about Louisville, Kentucky

Updated August 15, 2026

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Question:
How humid does it get during the summer months?

Kentucky experiences high humidity levels during the summer months, often making the weather feel hotter than the actual temperature. Average relative humidity in summer typically ranges from 70% to 80%, with mornings often more humid and slight decreases in the afternoon due to daytime heating.

The state’s humid subtropical climate, combined with its geography of rivers, forests, and rolling hills, contributes to consistently moist air during summer. Cities like Louisville and Lexington frequently experience muggy conditions, especially in July and August, when temperatures average in the mid-80s to low 90s Fahrenheit. This humidity can lead to discomfort, increased sweating, and a higher heat index, which is important for residents and visitors to consider for health and outdoor activities.

Key Points:
- Summer relative humidity often between 70% and 80%
- Morning humidity tends to be higher than afternoons
- Humid subtropical climate with moist air from local geography
- Heat index often higher than actual temperature due to humidity

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