UV Index in Koh Tao, Thailand

Last updated: July 2, 2025

In Koh Tao, Thailand, staying informed about the UV Index is crucial for safeguarding your skin while enjoying the sun-kissed beaches and vibrant marine life. Understanding UV levels can significantly aid in preventing sunburn and maintaining overall skin health, especially in a tropical climate where the UV exposure risks peak. With maximum UV Index readings soaring to 14 during midday, it's essential to be cautious and take protective measures to fully embrace all that this stunning island has to offer without compromising your well-being.

Hourly UV Index in Koh Tao

At dawn, as the sun rises at 07:00, the UV Index is a modest 1, perfect for a leisurely morning stroll. By 08:00, it creeps up to 2, maintaining a gentle warmth. The real sunbathing begins around 09:00 with a notable jump to 5. However, it’s from 10:00 to 12:00 that the sun truly takes center stage, reaching its peak at a sizzling 14 at noon. As the afternoon unfolds, the intensity slightly wanes, dropping to 11 by 14:00 and winding down to 4 by 16:00. As the sun dips lower, the UV Index falls to 2 at 17:00 and finally retreats to 0 by 19:00, signaling the end of the day. Be sun-smart and enjoy the sunshine safely!

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	13	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 Koh Tao

The UV Index demonstrates a consistently extreme exposure risk throughout the year, with the highest values occurring from March to April, where it reaches up to 15. Visitors and residents should note that the high-risk months span from January to October, maintaining an extreme rating across this period, with a brief drop to 11 in November and December. Regardless of the month, the burn time remains remarkably short at just 10 minutes, indicating an urgent need for protective measures against UV exposure. It is advisable for everyone to apply broad-spectrum sunscreen, wear protective clothing, and seek shade during peak sun hours to ensure safety from harmful UV radiation.

Monthly Maximum UV Index for Koh Tao, Thailand

The monthly maximum UV Index (UVI) represents the highest UV radiation level recorded each month in Koh Tao. 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 Koh Tao, 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 Koh Tao UV Index with Other Thailand Cities

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

Koh Tao's solar exposure compared to other cities in Thailand. Generated using Copernicus Atmosphere Monitoring Service information.
	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Mueang Nonthaburi UVI	10	12	14	13	14	13	14	14	13	12	9	8
Samut Prakan UVI	10	12	14	13	14	13	14	14	13	12	9	8
Bangkok UVI	10	12	14	13	14	13	14	14	13	12	9	8
Udon Thani UVI	9	11	13	14	14	13	14	14	14	12	10	9
Chon Buri UVI	10	13	14	14	14	13	14	14	13	13	10	9
Koh Tao	11	14	15	15	14	14	14	14	14	13	11	11