UV Index
UV Index
Today's UV index in Koh Tao, Thailand 
will be up to 12.9, indicating a extreme level of sun exposure for the average person. Check our tips for today to make sure you're safe in the sun.
Last checked: 2025-05-10
UV index at 12.9 in Koh Tao means extreme risk: limit outdoor time especially from 10 a.m. to 4 p.m., actively seek shade, wear protective clothing, broad-brimmed hat, apply SPF 30+ sunscreen every 2 hours, and wear UV-blocking sunglasses. Watch for bright surfaces like water and snow increasing UV exposure.
The UV index in Koh Tao is generally high, especially from March to May, often reaching levels above 10, which means strong sunlight exposure during midday hours.
Koh Tao has a tropical climate with a hot season from March to May, a rainy season from June to October, and a cooler, dry season from November to February.
Compared to mainland Thailand, Koh Tao is more humid and experiences more rain during the monsoon season. Its weather is warmer and wetter than neighboring countries like Vietnam and Cambodia.
See the UV index hour by hour for Koh Tao, along with the temperature and how cloudy it is. If the UV level is higher than moderate, it's best to avoid direct sunlight.