UV Index
UV Index
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Today's UV index in Cayenne, French Guiana 
will be up to 11.4, indicating extreme risk of harm from the sun's UV rays for the average person. Check our tips for today to make sure you're safe in the sun.
UV index at 11.4 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.
Read more here about the climate and sun exposure in and around Cayenne.
The UV index in Cayenne, French Guiana, can get quite high throughout the year, ranging from 10 to 12 (extreme) during peak hours of the day. This means that it is necessary to apply sunscreen with a high SPF, wear protective clothing, and seek shade to avoid sunburn and long-term skin damage.
Cayenne experiences two main weather seasons: a wet season and a dry season. The wet season typically lasts from December to July, with the peak rainfall occurring from April to June. During this time, heavy rainfall and thunderstorms are common, with an average precipitation of 300-400 mm (12-16 inches) per month. The dry season runs from August to November, with rainfall decreasing significantly and temperatures ranging between 25-30 °C (77-86 °F).
Compared to other cities in the region, Cayenne has a relatively high amount of rainfall and humidity due to its tropical climate. However, it also benefits from the cooling effects of the Atlantic Ocean and the trade winds. These factors moderate temperatures, with average highs around 30 °C (86 °F) and lows around 21 °C (70 °F) year-round. Additionally, the region is closer to the equator, resulting in higher sun exposure and the need for increased sun protection measures.
The chart above displays the Shortwave Radiation Sum (MJ/m²) for each day of the last year in Cayenne. It's designed to provide you with a better understanding of the yearly weather and sun exposure.