UV Index
UV Index
Today's UV index in Cayenne, French Guiana 
will be up to 11.9, 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 11.9 in Cayenne 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.
Cayenne has a UV index that ranges from moderate to very high, typically peaking around 11 during the equinox months. This means the sun's rays can be very strong for much of the year.
The city experiences an equatorial climate with a wet season from December to July and a drier season from August to November. Temperatures stay warm all year, usually between 24°C and 31°C.
Compared to neighboring Suriname and Brazil, Cayenne has similar tropical weather but often more rainfall due to its coastal location. The nearby countries also have wet and dry seasons, but the rainfall and humidity levels can vary slightly.
See the UV index hour by hour for Cayenne, along with the temperature and how cloudy it is. If the UV level is higher than moderate, it's best to avoid direct sunlight.