UV Index
UV Index
Today's UV index in Gustavia, Saint Barthélemy 
will be up to 12.3, indicating a extreme level of sun exposure for the average person. Check our tips for today to make sure you're safe in the sun.
Last checked: 2025-06-22
UV index at 12.3 in Gustavia means extreme risk: limit outdoor time especially from 10 a.m. to 4 p.m., actively seek shade, wear protective clothing, broad-brimmed hat, apply SPF 30+ sunscreen every 2 hours, and wear UV-blocking sunglasses. Watch for bright surfaces like water and snow increasing UV exposure.
The UV index in Gustavia, Saint Barthélemy, is generally high year-round, often ranging between 8 and 12, indicating strong ultraviolet radiation typical of tropical locations.
Seasonally, Gustavia experiences a wet season from June to November, with more rainfall and occasional hurricanes, while the dry season from December to May is sunnier and less humid.
Compared to the wider Caribbean region, Gustavia has a similar tropical climate but is slightly milder than some larger islands. It is generally sunnier and less rainy than neighboring islands like Guadeloupe and Martinique.
See the UV index hour by hour for Gustavia, along with the temperature and how cloudy it is. If the UV level is higher than moderate, it's best to avoid direct sunlight.