UV Index in Williamson, United States

Last updated: July 2, 2025

Understanding the UV Index is crucial in Williamson, United States, where sun exposure varies with the changing seasons. By being aware of UV levels, residents can effectively prevent sunburn and protect their skin health against harmful UV radiation. Williamson's BSk climate presents unique risks, with peak UV levels reaching as high as 12, particularly during midday hours. Knowing when to seek shade or apply sunscreen can help ensure a safe and enjoyable outdoor experience, allowing you to make the most of the sunny days while safeguarding your skin.

Hourly UV Index in Williamson

Experience a sunny day with fluctuating UV Index levels! Starting from a gentle 1 at 07:00, the intensity gradually climbs to reach a peak of 12 at both 12:00 and 13:00. As the sun rises higher, the UV Index hits a striking 11 at 11:00 and 14:00, indicating a need for protective measures. After 15:00, the levels start to decline, dropping to 5 by 16:00 and returning to a mild 1 by 18:00. Plan your outdoor activities wisely and remember, from 10:00 to 14:00, the sun's rays are at their strongest!

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	3	moderate	30 min
09:00	5	moderate	30 min
10:00	8	very high	15 min
11:00	11	extreme	10 min
12:00	12	extreme	10 min
13:00	12	extreme	10 min
14:00	11	extreme	10 min
15:00	8	very high	15 min
16:00	5	moderate	30 min
17:00	3	moderate	30 min
18:00	1	low	45 min
19:00	1	low	45 min

Monthly UV Index Trends in Williamson

Throughout the year, UV exposure varies significantly, with the high-risk months being March through August, when the UV Index peaks at 12, indicating extreme exposure levels. Specifically, April, May, and June consistently show this maximum UV Index, resulting in a burn time of only 10 minutes for unprotected skin. As summer transitions to fall, the UV Index gradually decreases, but still poses a very high risk in September and October with indices of 10 and 8, respectively. Residents and visitors should remain vigilant, particularly from March to August, and take protective measures, such as applying sunscreen, wearing protective clothing, and seeking shade during peak sunlight hours to minimize the risk of skin damage. In contrast, the winter months of January and December see lower UV exposure, categorized as moderate, with longer burn times of 30 minutes, making sun protection less critical but still advisable.

Monthly Maximum UV Index for Williamson, United States

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

The table above highlights how UV exposure in Williamson 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.

Williamson'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
Los Angeles UVI	4	6	8	9	10	11	11	10	10	7	5	4
Williamson	4	7	9	11	12	12	12	11	10	8	6	4
Houston UVI	5	8	9	11	11	12	12	11	10	9	7	5