UV Index in Koh Samui

Real-time UV forecast & tanning weather

Current Conditions

Loading live weather data...
1
Low
UV Index
🌡️
27°C
Temperature
🌧️
Moderate drizzle
Conditions
☀️
Peak Tanning Window 11AM • UV 3

Hourly UV Forecast

0
6AM
0
7AM
1
8AM
2
9AM
3
10AM
3
11AM
1
12PM
1
NOW
1
2PM
3
3PM
2
4PM
1
5PM
0
6PM
0
7PM
0
8PM
0
9PM
Low 0–2 Moderate 3–5 High 6–7 Very High 8–10 Extreme 11+

16-Day UV Forecast

3
Mon 1
Poor
7
Tue 2
Excellent
7
Wed 3
Good
8
Thu 4
Excellent
9
Fri 5
Excellent
8
Sat 6
Excellent
8
Sun 7
Excellent
6
Mon 8
Excellent
8
Tue 9
Excellent
8
Wed 10
Excellent
8
Thu 11
Excellent
7
Fri 12
Excellent
8
Sat 13
Excellent
8
Sun 14
Excellent
8
Mon 15
Excellent
8
Tue 16
Excellent

Location & Climate

Koh Samui enjoys a tropical climate with high UV intensity year-round, though its rainy season differs slightly from the mainland. Chaweng Beach is a popular choice with its long stretch of sand and direct sun, while the quieter beaches on the north coast offer a more relaxed tanning experience.

Tanning Tips

UV levels in Koh Samui are high year-round due to its tropical location. Always wear SPF 30+ and limit initial sessions to 15-20 minutes.

Weather data by Open-Meteo (CC BY 4.0)

Monthly UV Index in Koh Samui

Average daily maximum UV index by month

Jan
10
Feb
11
Mar
12
Apr
12
May
11
Jun
10
Jul
10
Aug
10
Sep
10
Oct
9
Nov
9
Dec
9
Low Moderate High Very High Extreme

Best Months to Tan in Koh Samui

Based on average UV levels, the best months for tanning in Koh Samui are:

January Excellent February Excellent March Excellent April Excellent May Excellent June Excellent July Excellent August Excellent September Excellent October Excellent November Excellent December Excellent

Rating based on average monthly UV index

Related Guides

Tanning in UV 9-10+ → Aggressive Tanning — What to Know → Safe Tanning Tips → Best Time of Day to Tan → How to Get Rid of a Tan →

Tanning Tools & Calculators

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Tanning Time Calculator

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Tanning Routine Creator

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Frequently Asked Questions

What is the UV index in Koh Samui right now?
The current UV index in Koh Samui is shown in the live weather section above. UV levels change throughout the day, typically peaking between 11 AM and 2 PM local time.
What is the best month to tan in Koh Samui?
The best months for tanning in Koh Samui are January, February, March, April, May, June, July, August, September, October, November, December, when average UV levels reach 7 or higher.
How long should I tan in Koh Samui?
Tanning time depends on your skin type and the current UV index. For a moderate UV of 10, a person with Skin Type III (medium complexion) can safely tan for about 15 minutes per session. Use our Tanning Calculator for personalized recommendations.
Is it safe to tan in UV index 12?
UV index 12 is classified as Extreme. Extreme — stay in shade during peak hours. Tanning is not recommended without strong protection.
When is the peak UV time in Koh Samui?
UV levels in Koh Samui typically peak between 11:00 AM and 2:00 PM local time. The exact peak depends on the season, cloud cover, and altitude.

UV Index in Nearby Cities

13
Koh Phangan
Avg. Peak UV
› 12
Koh Tao
Avg. Peak UV
› 14
Krabi
Avg. Peak UV
› 13
Ao Nang
Avg. Peak UV
› 13
Railay Beach
Avg. Peak UV
› 13
Khao Lak
Avg. Peak UV
›

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