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

Last updated: June 2, 2025

Understanding the UV Index is essential for residents and visitors in Saint Croix, U.S. Virgin Islands. With the island's tropical climate, the potential for high UV exposure can pose significant risks to skin health, including sunburn and long-term damage. By being aware of daily UV levels, you can better protect yourself and your loved ones from harmful rays. During peak hours, especially around noon when the UV Index can soar to 13, it's crucial to take preventive measures. Stay informed, enjoy the sunshine safely, and embrace the beautiful Caribbean lifestyle while safeguarding your skin!

Hourly UV Index in Saint Croix

The UV Index showcases a dynamic increase throughout the day, peaking at 13 around 12:00 PM. Starting from a gentle 1 at 7:00 AM, the index steadily climbs as the sun ascends, reaching 6 by 9:00 AM. The intensity becomes palpable by 11:00 AM with a sharp rise to 12, before hitting its zenith at 13 at noon, prompting caution for outdoor activities. As the afternoon unfolds, the levels begin to decline, dipping to 10 by 2:00 PM and gradually falling to 0 by 7:00 PM, signaling safer conditions for evening strolls. It’s essential to stay protected during the midday hours when the sun's rays are most intense!

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	6	high	25 min
10:00	9	very high	15 min
11:00	12	extreme	10 min
12:00	13	extreme	10 min
13:00	12	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