UV Index
UV Index
Today's UV index in Castries, Saint Lucia 
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: 2025-05-10
UV index at 12.5 in Castries 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 Castries, Saint Lucia, is generally high throughout the year, often ranging from moderate to very high levels, especially during the midday hours when the sun is strongest.
Castries has a tropical climate with a wet season from June to November and a dry season from December to May. Temperatures stay warm year-round, usually between 24°C to 31°C (75°F to 88°F).
Compared to nearby Caribbean islands, Castries experiences similar warm temperatures but tends to be wetter during the rainy season than some drier islands like Barbados. It is slightly cooler and rainier than islands closer to the equator, like Trinidad and Tobago.
See the UV index hour by hour for Castries, along with the temperature and how cloudy it is. If the UV level is higher than moderate, it's best to avoid direct sunlight.