UV Index in Saint Croix, Virgin Islands (U.S.)

Last updated: August 1, 2025

Understanding the UV Index is crucial for residents and visitors in Saint Croix, Virgin Islands (U.S.), where the sun's rays can be particularly intense. With a tropical climate that features high temperatures and ample sunshine, awareness of UV levels can help prevent sunburn and protect your skin health. The typical daily UV exposure ranges from moderate (3) in the morning to very high (13) during midday, posing significant risks if proper precautions aren’t taken. Staying informed about the UV Index can empower you to enjoy the beautiful outdoors while minimizing harmful effects from sun exposure.

Hourly UV Index in Saint Croix

The UV Index begins at a mild level of 1 at 07:00, but as the sun climbs higher, it swiftly escalates. By 10:00, it peaks at a critical 9, reaching a maximum of 13 at 12:00, indicating that protective measures are essential. After noon, the index gradually declines, tapering to 7 by 15:00, before dipping to a 2 by 17:00, and finally settling at 0 by 19:00 as the sun sets. This data highlights the importance of sun safety during the hours when UV exposure is at its highest, particularly around midday.

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	5	moderate	30 min
10:00	9	very high	15 min
11:00	12	extreme	10 min
12:00	13	extreme	10 min
13:00	13	extreme	10 min
14:00	10	very high	15 min
15:00	7	high	25 min
16:00	4	moderate	30 min
17:00	2	low	45 min
18:00	1	low	45 min
19:00	0	low	45 min

Monthly UV Index Trends in Saint Croix

Seasonal UV changes indicate that UV exposure peaks significantly from March through October, where the UV Index consistently reaches extreme levels of 13 or higher, particularly in September with a peak index of 14. During these high-risk months, the recommended burn time is as low as 10 minutes, highlighting the urgent need for sun protection. Both visitors and residents should take precautions by wearing broad-spectrum sunscreen, protective clothing, and seeking shade, especially between 11 AM and 4 PM, when the sun’s rays are the strongest. In January, November, and December, while UV levels drop to the very high category, it's still advisable to remain vigilant about skin protection.

Monthly Maximum UV Index for Saint Croix, Virgin Islands (U.S.)

The monthly maximum UV Index (UVI) represents the highest UV radiation level recorded each month in Saint Croix. 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 Saint Croix, 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 Saint Croix UV Index with Other Virgin Islands (U.S.) Cities

The table above highlights how UV exposure in Saint Croix compares to other major locations across Virgin Islands (U.S.). This comparison helps travelers and residents better understand regional sun intensity and plan outdoor activities with sun safety in mind.

Saint Croix's solar exposure compared to other cities in Virgin Islands (U.S.). Generated using Copernicus Atmosphere Monitoring Service information.
	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Charlotte Amalie UVI	9	11	13	13	13	13	12	13	14	12	9	8
Cruz Bay UVI	9	11	13	13	13	13	13	13	14	12	9	8
Saint Croix	9	11	13	13	13	13	13	13	14	12	10	9