UV Index
UV Index
Today's UV index in Saint John's, Antigua and Barbuda 
will be up to 12.5, 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: 2025-06-21
UV index at 12.5 in Saint John's 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 Saint John's, Antigua and Barbuda, is generally high throughout the year, often ranging from 7 to 12, meaning strong sun exposure is common. The highest UV levels occur during midday hours.
Saint John's experiences a tropical climate with a wet season from June to November, bringing more rain and humidity, and a dry season from December to May, which is sunnier and less humid. Temperatures remain warm year-round.
Compared to nearby Caribbean islands, Saint John's has similar warm temperatures and seasonal rainfall patterns but tends to receive slightly less rain than some eastern Caribbean nations like Dominica. It is sunnier and warmer than the more northern islands like Puerto Rico.
See the UV index hour by hour for Saint John's, along with the temperature and how cloudy it is. If the UV level is higher than moderate, it's best to avoid direct sunlight.