Ko Samui UV Index Today
- Current UV Index0.0
- Cloud Cover00%
- Temperature00.0 ℃
Day Summary
- Max UV Index9.5
- Avg Clouds72%
- Max Temp26.9 ℃
- Peak UV at 1 PM
- Protection Required ☀️
The UV index in Ko Samui, Thailand 
will reach a high of 9.5 today. This means a veryhigh level of sun exposure. See our tips below to stay safe!
Last checked: 2025-12-09
Hourly Forecast Chart
Today's Safety Tips
The risk is very high. It's best to stay out of the sun between 10 a.m. and 4 p.m. If you must be outside, wear protective clothing and apply sunscreen often.
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
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.
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