UV Index
UV Index
Today's UV index in Sioux City, United States 
will be up to 8.1, 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: 2025-05-09
With a UV index of 8.1 in Sioux City, 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.
Sioux City has a UV index that varies by season, reaching its highest values in summer months and dropping to low levels during winter. The UV index can range from around 2 in winter to 8 or 9 in summer.
Sioux City experiences four distinct seasons: cold winters with snow, warm humid summers, mild springs, and cool autumns. Temperature and precipitation levels change significantly throughout the year, with the warmest period from June to August.
Compared to other parts of the Midwest and nearby states like Nebraska and Iowa, Sioux City has a fairly typical continental climate. It tends to have more extreme temperatures than coastal regions but less humidity than the deeper south. Neighboring cities experience similar weather patterns.
See the UV index hour by hour for Sioux City, along with the temperature and how cloudy it is. If the UV level is higher than moderate, it's best to avoid direct sunlight.