UV Index in Grand-Santi, French Guiana

Last updated: July 2, 2025

In Grand-Santi, French Guiana, being aware of the UV Index is crucial for safeguarding your skin against harmful rays. Understanding UV levels can significantly reduce the risk of sunburn and long-term skin issues, allowing you to enjoy the tropical climate more safely. With its hot and humid Af climate, Grand-Santi experiences peak UV exposure around midday, where the index reaches up to a striking 12—putting you at high risk for skin damage if precautions are not taken. Stay informed and take necessary precautions to protect your skin while enjoying the vibrant outdoor life in this stunning region!

Hourly UV Index in Grand-Santi

The UV Index throughout the day showcases a dramatic rise and fall, starting at a mild 1 at 07:00 and escalating to a peak of 12 by noon. As the sun reaches its zenith, the index remains at a strong 12 from 12:00 to 13:00, indicating a high risk for unprotected skin. Following this midday intensity, the UVI gradually decreases, dipping to 8 by 15:00, then dropping to 4 by 16:00. As the late afternoon approaches, the numbers decline further, landing at 2 by 17:00 and finally retreating to a safe 0 after sunset at 19:00. It's crucial to take precautions during those peak hours to ensure skin safety in such intense UV conditions!

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	4	moderate	30 min
10:00	7	high	25 min
11:00	10	very high	15 min
12:00	12	extreme	10 min
13:00	12	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 Grand-Santi

The UV Index throughout the year shows a consistent pattern of extreme exposure, with the highest values recorded between January and April, peaking at 16 in March and April. February follows closely with an index of 15. Although the index slightly declines to 12 by June and remains there until December, the burn time remains a brief 10 minutes across all months, highlighting a sustained risk of sunburn. High-risk months include January through April, emphasizing the need for caution during these periods. Visitors and residents should take proactive measures, such as wearing sunscreen, protective clothing, and seeking shade to safeguard against harmful UV radiation at all times of the year.

Monthly Maximum UV Index for Grand-Santi, French Guiana

The monthly maximum UV Index (UVI) represents the highest UV radiation level recorded each month in Grand-Santi. 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 Grand-Santi, 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 Grand-Santi UV Index with Other French Guiana Cities

The table above highlights how UV exposure in Grand-Santi 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.

Grand-Santi'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
Remire-Montjoly UVI	13	14	16	16	14	13	12	13	13	13	13	12
Cayenne 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
Grand-Santi	13	15	16	16	14	12	12	13	13	13	13	12