UV Index in Sioux Falls, United States

Last updated: July 2, 2025

In Sioux Falls, understanding the UV Index is essential for safeguarding your skin health and preventing sunburn, especially during peak sunlight hours. With a climate classified as Dfa—characterized by warm summers and a mix of sunny and cloudy days—the potential for high UV exposure increases significantly. During the summer months, the UV Index can reach levels as high as 10, particularly around noon and early afternoon, posing serious risks for unprotected skin. By staying informed about UV levels, you can take proactive measures to protect yourself and enjoy the sunshine safely.

Hourly UV Index in Sioux Falls

From the early morning hours, UV Index levels remain low, peaking at 1 until 09:00. As the day unfolds, there's a notable rise, hitting 5 by 10:00 and soaring to a striking 10 at its zenith between 13:00 and 14:00. This period marks the sun's intensity at its strongest, urging caution for those venturing outdoors. After 14:00, the index gradually declines, settling to 3 by 18:00. As dusk approaches, the UV Index drops further to 1 by 19:00, indicating a safe return for outdoor activities. Stay protected during the midday hours when the sun’s rays are at their peak!

Average solar exposure data for the current time of the year. Actual values may vary and depend on many factors, such as cloud cover, vegetation cover, surface type, etc.
Time	UVI	Category	Time to Burn
07:00	1	low	45 min
08:00	1	low	45 min
09:00	3	moderate	30 min
10:00	5	moderate	30 min
11:00	7	high	25 min
12:00	9	very high	15 min
13:00	10	very high	15 min
14:00	10	very high	15 min
15:00	8	very high	15 min
16:00	6	high	25 min
17:00	4	moderate	30 min
18:00	3	moderate	30 min
19:00	1	low	45 min

Monthly UV Index Trends in Sioux Falls

Throughout the year, UV levels exhibit significant seasonal changes, with the most intense exposure occurring during the summer months. January and December have the lowest UV Index values (2), indicating low risk for sunburn, while February and March present a moderate risk with an index of 5. High-risk months include April through September, where UV Index values peak at 11 in June, categorizing it as extreme exposure. During these peak months, residents and visitors are advised to practice sun safety by seeking shade, wearing protective clothing, and applying sunscreen frequently, especially between 10 AM and 4 PM when UV rays are strongest. As the UV levels decrease in October and November, precautions can be relaxed, but maintaining a moderate level of awareness remains essential.

Monthly Maximum UV Index for Sioux Falls, United States

The monthly maximum UV Index (UVI) represents the highest UV radiation level recorded each month in Sioux Falls. It measures the strength of ultraviolet radiation from the sun and helps assess the risk of sunburn and UV-related health issues.

Data source: Statistical UV Index data for Sioux Falls, based on information from the Copernicus Climate Change Service.

UV Risk Categories

Extreme (11+): Avoid the sun, stay in shade.
Very High (8-10): Limit sun exposure.
High (6-7): Use SPF 30+ and protective clothing.
Moderate (3-5): Midday shade recommended.
Low (0-2): No protection needed.

Compare Sioux Falls UV Index with Other United States Cities

The table above highlights how UV exposure in Sioux Falls compares to other major locations across United States. This comparison helps travelers and residents better understand regional sun intensity and plan outdoor activities with sun safety in mind.

Sioux Falls's solar exposure compared to other cities in United States. Generated using Copernicus Atmosphere Monitoring Service information.
	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Sioux Falls	2	5	5	8	9	11	10	9	8	5	3	2
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
Houston UVI	5	8	9	11	11	12	12	11	10	9	7	5