United States
UV Index in South Dakota — Current UV Levels
Check the current UV index for 1 cities in South Dakota. Select a city below for real-time UV data, hourly forecasts, and sun protection advice.
UV Index by City in South Dakota
Sun Safety in South Dakota
UV levels in South Dakota vary by season, altitude, and proximity to water. The WHO recommends sun protection whenever UV reaches 3 or higher. Apply SPF 30+ before outdoor activities and reapply every 2 hours.
UV Index in South Dakota: What to Know
South Dakota has moderate-to-high summer UV across its plains and the higher Black Hills.
Across South Dakota, the UV index peaks in the four hours around solar noon (roughly noon to 3 PM local time). The World Health Organization recommends sun protection whenever the UV index reaches 3 or higher: apply broad-spectrum SPF 30 at UV 3–5, SPF 50 at UV 6–7, and SPF 50+ with reapplication every two hours at UV 8 and above. Check the live, hour-by-hour UV index for Sioux Falls on the city pages above before heading outdoors.
Common Questions About UV in South Dakota
When is the UV index highest in South Dakota?
UV in South Dakota is strongest between noon and 3 PM local time, and highest in the summer months when the sun sits highest in the sky. Check the hourly chart for Sioux Falls above to see today's exact peak.
Do I need sunscreen in South Dakota?
Yes — whenever the UV index reaches 3 or higher, which in South Dakota covers most of the daytime hours from spring through fall. Even on cloudy days, up to 80% of UV can reach the ground.
How accurate is this UV data for South Dakota?
Our UV index for South Dakota comes from Open-Meteo, which aggregates national weather-service models, and updates every 15 minutes. Levels follow the official WHO global solar UV index scale.