UV Index in Cayenne, French Guiana

Last updated: June 2, 2025

In Cayenne, French Guiana, being aware of the UV Index is crucial for maintaining healthy skin and preventing sunburn. The tropical Af climate here delivers intense sunlight, with peak UV levels often reaching a hazardous 13 around noon. Understanding these UV levels is essential for outdoor enthusiasts and residents alike; it helps in planning safe sun exposure, protecting against the harmful effects of UV radiation. With Cayenne's unique climate, staying informed about the UV Index can make all the difference in enjoying the sun while safeguarding your health.

Hourly UV Index in Cayenne

The UV Index throughout the day follows a distinct pattern of rising intensity and eventual decline. Starting at a mild 1 at 7:00 AM, it quickly ramps up, reaching 2 by 8:00 AM and hitting 5 by 9:00 AM. The sun climbs higher, peaking at 13 during the midday hours from 12:00 PM to 1:00 PM, a time when protective measures are essential. As the afternoon progresses, the index gently descends to 10 at 2:00 PM and further dips to 7 by 3:00 PM. The sun begins to wane, bringing not only a cooler feel but also a significant drop to 2 by 5:00 PM and finishing the day at a safe 0 after 7:00 PM. For those basking in the sunlight, these shifts serve as timely reminders to stay protected during peak hours!

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	8	very high	15 min
11:00	11	extreme	10 min
12:00	13	extreme	10 min
13:00	13	extreme	10 min
14:00	10	very high	15 min
15:00	7	high	25 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