UV Index
UV Index
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Today's UV index in Cayenne, French Guiana 
will be up to 12.9, indicating a extreme level of sun exposure for the average person. Check the annual sun radiation in the city and our tips for today to make sure you're safe in the sun.
UV index at 12.9 in Cayenne means extreme risk; limit outdoor time from 10 a.m. to 4 p.m., use shade, protective clothing, SPF 30+ sunscreen, and sunglasses; watch for bright surfaces like water and snow increasing UV exposure.
The UV index in Cayenne, French Guiana, is consistently high year-round due to its location near the equator. On average, the UV index ranges from 9-12, making it essential to take sun protection measures.
Cayenne has two main seasons: a wet season and a dry season. The wet season lasts from April to August, with frequent rain showers and high humidity levels. The dry season occurs from September to February, with less rainfall and lower humidity.
Compared to its region and neighboring countries, Cayenne has a tropical climate with consistently high temperatures and humidity throughout the year. Surrounding countries like Brazil and Suriname have similar climates, but Cayenne's wet season is more pronounced due to its location along the northeastern coast of South America.
The chart below displays the average Shortwave Radiation Sum (MJ/m²) for each month of the last year in Cayenne. It's designed to provide you with a better understanding of the yearly weather and sun exposure.