UV Index Today in Louisville, Kentucky
Louisville's UV Climate
Louisville, located in northern Kentucky, experiences a humid subtropical climate with moderate to high UV exposure during the summer months. The city's midwestern location brings variable weather, but clear summer days can result in high UV index values. Sun protection is important for outdoor activities, especially during peak hours.
Average Annual UV Index
6.7
Peak UV Season
May - September
Sunny Days per Year
195
Typical UV Index by Season in Louisville
| Season | Typical Midday UV | Protection Needed |
|---|---|---|
| Summer | High to Very High (7-9) | SPF 30+, hat, sunglasses; shade from 10 AM – 4 PM |
| Spring & Fall | Moderate to High (4-6) | SPF 30+ for extended time outdoors |
| Winter | Low to Moderate (2-3) | Sunscreen for long midday exposure; more on snow |
UV Index in Nearby Cities
- UV Index in Indianapolis, IN107 mi away
- UV Index in Nashville, TN155 mi away
- UV Index in Knoxville, TN188 mi away
- UV Index in Columbus, OH189 mi away
Practical Tips for Outdoor Activities
Make the most of outdoor activities while staying safe in Jefferson County:
- Check UV index and weather radar before planning outdoor activities
- Schedule outdoor activities during low UV hours
- Use appropriate sun protection based on UV levels
- Stay hydrated during outdoor activities
- Take regular breaks in shaded areas
- Monitor weather conditions for changes
- Be prepared for sudden weather changes
- Know the signs of heat-related illness
- Wear a hat and protective clothing
- Check visibility conditions before outdoor plans
- Stay alert to weather alerts and warnings
UV and Weather in Jefferson County
Learn about Jefferson County's unique climate patterns, UV radiation levels, and how they affect your daily life. Enter your zip code for location-specific weather radar data and UV forecasts to help you make informed decisions about outdoor activities and sun protection.
Climate and UV Patterns
Louisville's climate features cold winters and hot, humid summers. UV index values are highest from late spring through early fall, with peak values reaching 8-9 on clear days. Cloud cover is common, but when skies are clear, UV radiation can be intense.
UV Index and Health Impact
Understanding UV radiation levels is crucial for protecting your health. Typical clear-day UV index values in Louisville through the year:
- Summer: High to Very High (7-9)
- Spring/Fall: Moderate to High (4-6)
- Winter: Low to Moderate (2-3)
- Peak UV hours: 10 AM - 4 PM
- Cloud cover can reduce UV by 20-40%, but does not eliminate it
- Clear skies bring maximum UV exposure
Local Weather Patterns
Louisville's weather is variable, with frequent changes in cloud cover and temperature. Summer brings the highest UV exposure, especially during midday hours. Residents and visitors should use sun protection during outdoor activities, particularly in parks and at outdoor events. Winter UV levels are low but not negligible, especially on sunny, snowy days.
Frequently Asked Questions About UV in Louisville
What is the UV index in Louisville today?
The live UV index for Louisville, KY is shown at the top of this page and updates throughout the day, along with today's maximum and an hourly forecast.
When is the sun strongest in Louisville?
UV radiation is strongest between 10 AM and 4 PM. Louisville's peak UV season runs May - September, when the midday index typically reaches High to Very High (7-9).
How high does the UV index get in Louisville?
Summer days in Louisville typically reach High to Very High (7-9). Spring and fall usually bring Moderate to High (4-6), while winter values are typically Low to Moderate (2-3).
Do I need sunscreen in Louisville during winter?
Winter UV in Louisville is usually low, so sunburn risk is limited on typical days. Sunscreen is still wise during midday hours or around reflective snow.
How sunny is Louisville compared to other cities?
Louisville averages about 195 sunny days per year with an average annual UV index around 6.7.