UV Index in Williamsburg, United States

Last updated: July 2, 2025

Understanding the UV Index is crucial for residents and visitors in Williamsburg, United States, as it helps to safeguard against harmful sun exposure. The UV levels can soar, particularly during peak hours, making it essential to monitor these fluctuations for effective sunburn prevention and long-term skin health. With a BSk climate that combines hot summers and moderate sunlight, Williamsburg poses specific UV exposure risks that demand attention. Keeping an eye on the daily UV Index ensures that everyone can enjoy the sunny outdoors safely and maintain healthy skin.

Hourly UV Index in Williamsburg

As the sun rises, the UV Index begins its upward climb, reaching 1 at 07:00 before steadily increasing throughout the morning. By 09:00, it hits 4, signaling a moderate level of UV exposure. The intensity peaks spectacularly at 12:00, soaring to a striking 12, indicating elevated risk for unprotected skin. This peak remains steady until 14:00, before a gradual decline starts to take place. By 15:00, the index drops to 9, and as the day wanes, it settles back down to 1 by 19:00. It's a powerful reminder of the sun's strength and the importance of sun protection during those midday hours!

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	4	moderate	30 min
10:00	7	high	25 min
11:00	10	very high	15 min
12:00	12	extreme	10 min
13:00	12	extreme	10 min
14:00	12	extreme	10 min
15:00	9	very high	15 min
16:00	7	high	25 min
17:00	4	moderate	30 min
18:00	2	low	45 min
19:00	1	low	45 min

Monthly UV Index Trends in Williamsburg

The UV Index notably varies throughout the year, highlighting significant seasonal changes in sun exposure. High-risk months include March through August, where the UV Index reaches very high to extreme levels, particularly in April and June, with burn times as brief as 10 minutes. During these months, residents and visitors are urged to take precautions such as wearing sunscreen, protective clothing, and seeking shade to minimize the risk of skin damage. In contrast, the UV Index is lower during the winter months of January and December, where it is classified as moderate, allowing for safer outdoor activities with burn times of 30 minutes. It is crucial to remain vigilant about sun safety as conditions can change rapidly, especially in the peak summer months.

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
Los Angeles UVI	4	6	8	9	10	11	11	10	10	7	5	4
Williamsburg	4	7	9	11	12	13	12	12	10	7	5	4
Houston UVI	5	8	9	11	11	12	12	11	10	9	7	5