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Ko Samui UV Index Today

Day Summary

The UV index in Ko Samui, Thailand Flag of Thailand will reach a high of 12 today. This means a extreme level of sun exposure. See our tips below to stay safe!

Last checked: 2025-08-08

Hourly Forecast Chart

Today's Safety Tips

Extreme danger! Avoid being in the sun, especially during midday. If you go out, cover up with clothing, a hat, and sunglasses, and use plenty of sunscreen.

Ko Samui's UV Index

Ko Samui’s UV index is usually very high, often between 8 and 12, meaning the sun’s rays are strong most days, especially around midday.

Weather Seasons

UV index

The island has a tropical climate with three main seasons: a hot season from March to June, a rainy season from October to December, and a cooler, dry season from January to February.

Ko Samui's Climate

Compared to mainland Thailand, Ko Samui is generally more humid and experiences its rainy season later. It is warmer and less dry than nearby countries like Malaysia and Vietnam during the cool season.

Hourly UV Index Trend

See the UV index hour by hour for Ko Samui. When the level is high, it's smart to find some shade.

Disclaimer

* The information on this page about the UV index in Ko Samui is for educational purposes only. It is not a substitute for professional medical advice. Always consult a doctor for any health concerns.