UV Index in Cayenne, French Guiana

Last updated: May 3, 2025

Understanding the UV Index in Cayenne, French Guiana, is crucial for anyone who enjoys the sun-soaked climate of this tropical paradise. With a distinct Af climate, the region often experiences high UV levels that can pose serious risks to skin health, such as sunburn and long-term damage. During peak hours, particularly between 10 AM and 2 PM, UV Index values soar to dangerous levels, reaching as high as 14, meaning that proper sun protection is essential. By staying informed about the UV Index, residents and visitors alike can take proactive steps to guard against harmful exposure, ensuring a safe and enjoyable experience under the sun.

Hourly UV Index in Cayenne

This hour-by-hour breakdown of the UV Index reveals a dynamic pattern of sun exposure throughout the day. Starting at 07:00 with a gentle 1, the intensity steadily increases, peaking at 12:00 when it reaches a striking 14—the highest point of the day, ideal for those seeking a sun-kissed glow. The index then begins to decline, with 11:00 hitting a close 12 before tapering off to more manageable levels by 16:00 at 4. As the sun sets, the UV Index drops to a mere 0 by 19:00, highlighting the importance of sun protection during peak hours, particularly between 10:00 and 14:00, when UV levels are most intense. Stay safe and enjoy the sun wisely!

Average solar exposure data for the current time of the year. Actual values may vary and depend on many factors, such as cloud cover, vegetation cover, surface type, etc.
Time	UVI	Category	Time to Burn
07:00	1	low	45 min
08:00	2	low	45 min
09:00	5	moderate	30 min
10:00	9	very high	15 min
11:00	12	extreme	10 min
12:00	14	extreme	10 min
13:00	14	extreme	10 min
14:00	11	extreme	10 min
15:00	8	very high	15 min
16:00	4	moderate	30 min
17:00	2	low	45 min
18:00	1	low	45 min
19:00	0	low	45 min

Monthly UV Index Trends in Cayenne

Throughout the year, extreme UV levels persist in this region, with the highest UV Index recorded from February to April, peaking at 16. March and April are particularly noteworthy for their elevated risk, as average burn time remains consistent at just 10 minutes across months. Visitors and residents are strongly advised to take precautionary measures during these high-risk months, including wearing protective clothing, applying broad-spectrum sunscreen, and seeking shade during peak sunlight hours. The consistent extreme exposure category across the year underscores the need for heightened awareness and protection against harmful UV radiation.

Monthly Maximum UV Index for Cayenne, French Guiana

The monthly maximum UV Index (UVI) represents the highest UV radiation level recorded each month in Cayenne. It measures the strength of ultraviolet radiation from the sun and helps assess the risk of sunburn and UV-related health issues.

Data source: Statistical UV Index data for Cayenne, based on information from the Copernicus Climate Change Service.

UV Risk Categories

Extreme (11+): Avoid the sun, stay in shade.
Very High (8-10): Limit sun exposure.
High (6-7): Use SPF 30+ and protective clothing.
Moderate (3-5): Midday shade recommended.
Low (0-2): No protection needed.

Compare Cayenne UV Index with Other French Guiana Cities

The table above highlights how UV exposure in Cayenne compares to other major locations across French Guiana. This comparison helps travelers and residents better understand regional sun intensity and plan outdoor activities with sun safety in mind.

Cayenne's solar exposure compared to other cities in French Guiana. Generated using Copernicus Atmosphere Monitoring Service information.
	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Matoury UVI	13	14	16	16	14	13	12	13	13	13	13	12
Cayenne	13	14	16	16	14	13	12	13	13	13	13	12
Remire-Montjoly UVI	13	14	16	16	14	13	12	13	13	13	13	12
Kourou UVI	13	14	16	16	14	13	12	13	13	13	13	12
Saint-Laurent-du-Maroni UVI	13	14	16	15	14	13	12	13	13	13	13	11