UV Index
UV Index
Today's UV index in St. Louis, United States 
will be up to 8.7, indicating a very high level of sun exposure for the average person. Check our tips for today to make sure you're safe in the sun.
Last checked: 2025-05-10
With a UV index of 8.7 in St. Louis, it's crucial to safeguard your skin from harmful UV rays. Protect yourself by minimizing sun exposure, wearing protective clothing, and applying SPF 30+ sunscreen every 2 hours.
The UV index in St. Louis varies from low in winter to very high in summer, peaking around 8 to 10 during the hottest months. UV levels are moderate in spring and fall.
St. Louis experiences four distinct seasons with cold, sometimes snowy winters and hot, humid summers. Spring and fall are mild and pleasant, with occasional rain and thunderstorms, especially in spring.
Compared to the Midwest region, St. Louis generally has more humidity and warmer summers than cities further north. It has more extreme temperatures than nearby states like Missouri and Illinois but milder winter cold than places farther north.
See the UV index hour by hour for St. Louis, along with the temperature and how cloudy it is. If the UV level is higher than moderate, it's best to avoid direct sunlight.