UV Index in Bismarck, United States

Last updated: June 2, 2025

Understanding the UV Index is crucial for residents of Bismarck, United States, where exposure to ultraviolet radiation can significantly impact your skin health. With the highest UV levels peaking around midday—reaching an alarming 11—this awareness can help prevent painful sunburns and reduce long-term skin damage. Bismarck's Dfa climate means hot summers with intense sunlight, making it essential for everyone to stay informed about daily UV forecasts and protect themselves effectively. Whether you’re heading outdoors for work or play, knowing the UV Index can make all the difference in ensuring your skin remains healthy and safe from harmful rays.

Hourly UV Index in Bismarck

At dawn, the UV Index starts gently, peaking at 1 by 07:00 and 08:00, making it a safe time for early morning strolls. As the day progresses, the intensity gradually increases, reaching 4 by 10:00 and soaring to a striking 9 by noon. The sun reaches its zenith around 13:00, with a blistering 10, and even escalates to an impressive 11 by 14:00—the highest point of the day. As afternoon turns to evening, the index retreats; it dips to 8 by 16:00 and further down to a moderate 3 by 18:00, offering a more comfortable environment for outdoor activities. By 19:00, the UV intensity settles at a humble 2, signalling that the sun is winding down, making way for a lovely evening.

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	2	low	45 min
10:00	4	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	11	extreme	10 min
15:00	10	very high	15 min
16:00	8	very high	15 min
17:00	5	moderate	30 min
18:00	3	moderate	30 min
19:00	2	low	45 min

Monthly UV Index Trends in Bismarck

As the seasons change, so do the UV Index levels, significantly impacting sun exposure risk. High-risk months occur from April through September, with the peak UV Index reaching 11 in June, categorized as extreme, and a burn time of just 10 minutes. In contrast, January and December present the lowest risk, with UV Index levels of 3 and 2, respectively. Visitors and residents should be particularly cautious during the very high to extreme UV periods; wearing sunscreen, seeking shade, and wearing protective clothing are essential measures to minimize the risk of sunburn and long-term skin damage. Regularly checking the daily UV Index will help ensure safe outdoor activities throughout the year.

Monthly Maximum UV Index for Bismarck, United States

The monthly maximum UV Index (UVI) represents the highest UV radiation level recorded each month in Bismarck. 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 Bismarck, 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 Bismarck UV Index with Other United States Cities

The table above highlights how UV exposure in Bismarck 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.

Bismarck'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
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
Bismarck	3	5	6	9	10	11	10	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