UV Index in Williamsburg, United States

Last updated: May 3, 2025

In Williamsburg, United States, being aware of the UV Index is essential for protecting your skin and maintaining overall health. Understanding UV levels helps prevent sunburn and reduces the risk of long-term skin damage, making it crucial for anyone who enjoys the outdoors. With a Cfa climate characterized by hot summers and moderate UV exposure, residents and visitors alike should pay attention to the daily fluctuations in UV Index—peaking at a notable 10 around noon, when the sun's rays are most intense. Stay informed and stay safe as you bask in the beauty of Williamsburg!

Hourly UV Index in Williamsburg

The UV Index today presents a definite peak during midday, with readings starting at a mild 1 at 07:00. As the day progresses, it climbs steadily, reaching 10 by noon and at 13:00, signaling an intense risk for sun exposure. Be prepared if you're outdoors during these hours! After this peak, the index gradually tapers off, descending to 6 by 16:00 and a gentle 1 by 19:00. It's a classic example of a sunny day where protection is essential, especially during the midday hours when the sun's rays are at their strongest. Enjoy the sunshine, but stay safe!

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	2	low	45 min
09:00	3	moderate	30 min
10:00	6	high	25 min
11:00	8	very high	15 min
12:00	10	very high	15 min
13:00	10	very high	15 min
14:00	9	very high	15 min
15:00	8	very high	15 min
16:00	6	high	25 min
17:00	3	moderate	30 min
18:00	2	low	45 min
19:00	1	low	45 min

Monthly UV Index Trends in Williamsburg

Throughout the year, the UV Index experiences significant fluctuations, impacting sun exposure risk. From January to March, the UV Index rises gradually from 3 (moderate) to 7 (high), with varying burn times of 30 to 25 minutes. April through August marks the peak UV exposure, with the Index reaching up to 11 (extreme) in July, where the burn time reduces to just 10 minutes. This period includes high-risk months—April to August—when residents and visitors should take extra precautions, such as wearing sunscreen, protective clothing, and seeking shade, especially during midday hours. As September to November approaches, UV levels decrease, returning to 5 (moderate) in November and 3 (moderate) in December, allowing for safer sun exposure during these months. It’s essential for everyone to stay informed and adapt their sun safety practices according to these seasonal changes.

Monthly Maximum UV Index for Williamsburg, United States

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

The table above highlights how UV exposure in Williamsburg 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.

Williamsburg'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
Williamsburg	3	6	7	9	10	10	11	10	9	8	5	3
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