UV Index
UV Index
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Today's UV index in Louisville, United States 
will be up to 6.3, indicating high risk of harm from the sun's UV rays for the average person. Check our tips for today to make sure you're safe in the sun.
With Louisville's UV index reaching 6.3, protect your skin from harm by staying in shade, wearing protective clothing, and applying SPF 30+ sunscreen every 2 hours between 10 a.m. and 4 p.m., when UV rays are strongest.
Read more here about the climate and sun exposure in and around Louisville.
The UV index in Louisville typically ranges from moderate to high throughout the year. During the summer months, the index can reach very high levels, often exceeding 8-10 (on a scale of 0-11+). This means that it is essential to protect your skin from the sun's harmful rays by wearing sunscreen, sunglasses, and protective clothing.
Louisville experiences four distinct seasons: spring, summer, fall, and winter. Spring and fall tend to be mild with temperatures ranging from 10-20 °C (50-68 °F), while summer is hot and humid with temperatures averaging around 30 °C (86 °F) and can sometimes exceed 35 °C (95 °F). Winter brings colder temperatures ranging from -5 to 5 °C (23 to 41 °F), with occasional snowfall.
Compared to its region, Louisville generally has a relatively higher sun exposure due to its location in the Ohio Valley. However, compared to states located nearer to the equator, the sun's intensity is lower. Nevertheless, it is still important to take precautions against sunburn and skin damage, especially during the summer months when the sun is at its strongest.
The chart above displays the Shortwave Radiation Sum (MJ/m²) for each day of the last year in Louisville. It's designed to provide you with a better understanding of the yearly weather and sun exposure.