Last updated: July 2, 2025
Understanding the UV Index in Louisville, United States is essential for safeguarding your skin and overall health. With UV levels peaking during the midday hours, awareness can help prevent painful sunburns and reduce long-term skin damage. Louisville's Cfa climate brings warm summers, resulting in heightened UV exposure that residents must navigate. By being informed about daily UV fluctuations, you can enjoy outdoor activities safely while minimizing your risk. Stay sun-savvy and protect your skin from the sun's intense rays!
As the sun rises, the UV Index peaks in intensity throughout the day, starting at a mild 1 by 07:00. Gradually, it climbs to 2 by 09:00, but the real heat kicks in just before noon, where it bursts to a crisp 9 by 12:00. The afternoon sees this intensity soar to a maximum of 11 at both 13:00 and 14:00, indicating an immediate need for sun protection. As the day begins to wind down, UV levels decrease, dropping to 5 by 17:00, and settling back to 1 by 19:00. Peak intensity typically occurs between late morning and early afternoon, reminding us to stay vigilant in safeguarding our skin during these critical hours.
Time | UVI | Category | Time to Burn |
---|---|---|---|
07:00 | 1 | low | 45 min |
08:00 | 1 | low | 45 min |
09:00 | 2 | low | 45 min |
10:00 | 5 | moderate | 30 min |
11:00 | 7 | high | 25 min |
12:00 | 9 | very high | 15 min |
13:00 | 11 | extreme | 10 min |
14:00 | 11 | extreme | 10 min |
15:00 | 10 | very high | 15 min |
16:00 | 7 | high | 25 min |
17:00 | 5 | moderate | 30 min |
18:00 | 3 | moderate | 30 min |
19:00 | 1 | low | 45 min |
Throughout the year, the UV Index experiences notable fluctuations, with the highest values occurring from March to August. Specifically, May through July are characterized by an extreme UV Index of 11, necessitating caution as the burn time is reduced to just 10 minutes. These peak months represent a high-risk period for sunburn and potential skin damage. In contrast, January and December see the lowest UV exposure, categorized as moderate with burn times of up to 30 minutes. Visitors and residents are strongly advised to take protective measures, such as wearing sunscreen and protective clothing, particularly during the high-risk months of March to August. Staying informed about the UV Index can help ensure a safer experience outdoors.
UV Risk Categories
Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
---|---|---|---|---|---|---|---|---|---|---|---|---|
Chicago UVI | 3 | 4 | 6 | 8 | 9 | 10 | 10 | 9 | 8 | 6 | 4 | 2 |
Brooklyn UVI | 3 | 5 | 6 | 8 | 10 | 10 | 9 | 9 | 8 | 6 | 4 | 2 |
New York City UVI | 3 | 5 | 6 | 8 | 10 | 10 | 9 | 9 | 8 | 6 | 4 | 2 |
Los Angeles UVI | 4 | 6 | 8 | 9 | 10 | 11 | 11 | 10 | 10 | 7 | 5 | 4 |
Louisville | 4 | 6 | 8 | 10 | 11 | 11 | 11 | 10 | 9 | 7 | 6 | 3 |
Houston UVI | 5 | 8 | 9 | 11 | 11 | 12 | 12 | 11 | 10 | 9 | 7 | 5 |