UV Index in Williston, United States

Last updated: June 2, 2025

Understanding the UV Index in Williston, United States, is crucial for safeguarding your skin against harmful ultraviolet radiation. With the average UV levels reaching a peak of 9 during the summer months, awareness of these numbers can greatly aid in preventing sunburn and promoting long-term skin health. Williston's BSk climate, characterized by its semi-arid conditions, means residents encounter unique UV exposure risks, particularly during the sunnier times of the day. Stay informed and protect yourself with a proactive approach to UV safety!

Hourly UV Index in Williston

The UV Index data for the day reveals a dynamic and intense sun exposure. Starting off with a maximum of 1 at 7:00 AM and 8:00 AM, it quickly rises to 2 by 9:00 AM. The sun reaches its peak intensity from 12:00 PM to 3:00 PM, hitting a scorching 9 during the hottest hours. As the afternoon wanes, the UV index gradually declines to 7 by 4:00 PM, then further to 5 at 5:00 PM, and eventually settling at a more manageable 2 by 7:00 PM. To stay safe and protect your skin, it's crucial to seek shade and apply sunscreen, especially during those midday hours when the UV Index is at its highest!

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	6	high	25 min
12:00	8	very high	15 min
13:00	9	very high	15 min
14:00	9	very high	15 min
15:00	9	very high	15 min
16:00	7	high	25 min
17:00	5	moderate	30 min
18:00	3	moderate	30 min
19:00	2	low	45 min

Monthly UV Index Trends in Williston

Throughout the year, the UV Index exhibits notable seasonal changes, peaking during the summer months from April to August. In April, the UV Index rises dramatically to 9, indicating a very high exposure category, which continues into July before slightly decreasing in August. The months of April, May, June, and July, with high values of 8 to 9, represent the highest risk for UV exposure, where the burn time is as short as 15 minutes. Conversely, the winter months of January, November, and December have a low UV Index of 2, allowing for substantially longer burn times of 45 minutes. Visitors and residents are advised to take precautions during the high-risk months by wearing sunscreen, sunglasses, and protective clothing, especially between 10 AM and 4 PM, when UV radiation is most intense.

Monthly Maximum UV Index for Williston, United States

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

The table above highlights how UV exposure in Williston 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.

Williston'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
Williston	2	4	5	9	8	9	9	8	7	5	2	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