UTC Offset
UTC+07:00
Ko Samui, Thailand Snapshot 2026
Where is Ko Samui?
Ko Samui, Thailand
- Continent
- Asia
- Country
- Thailand
- City
- Ko Samui
- Population
- 50K
- Coordinates
- 9.54°, 99.94°
Ko Samui is a city in Thailand with a population of approximately 50K. Average temperatures range from 26°C (79°F) in January to 30°C (87°F) in May. The best time to visit is January, February, December.
Time in Ko Samui right now
Open full time & time zone page 00:10 10
Wednesday, July 1, 2026
IANA time zone
Asia/Bangkok
Daylight saving
No DST
Next DST change
—
Live weather in Ko Samui
Daylight in Ko Samui today
View full sunrise & sunset page Sunrise
Sunset
Day length
12h 40m
Climate normals for Ko Samui
Long-term monthly averages based on historical data.
January best
Good 
February best
Good March
Fair April
Poor May
Wet June
Poor July
Wet August
Wet September
Wet October
Wet November
Wet December best
Wet | Month | Temp | Feels Like | Rain | Sun | Humidity | UV | Status | Details |
|---|---|---|---|---|---|---|---|---|
| January best | 28°C / 26°C | 32°C / 29°C | 10days (100 mm) Wet | 10.2h Excellent | 78% Humid | 7.7 Very High | Good | View Details |
| February best | 28°C / 26°C | 33°C / 29°C | 8days (54 mm) Wet | 10.7h Excellent | 76% Humid | 8.5 Very High | Good | View Details |
| March | 29°C / 27°C | 35°C / 30°C | 7days (36 mm) Good | 10.9h Excellent | 76% Humid | 9.2 Very High | Fair | View Details |
| April | 30°C / 28°C | 37°C / 32°C | 11days (118 mm) Wet | 10.6h Excellent | 77% Humid | 9.1 Very High | Poor | View Details |
| May | 30°C / 28°C | 37°C / 32°C | 20days (130 mm) Wet | 10.1h Excellent | 78% Humid | 7.7 Very High | Wet | View Details |
| June | 30°C / 28°C | 36°C / 31°C | 17days (75 mm) Wet | 9.6h Good | 76% Humid | 7.3 Very High | Poor | View Details |
| July | 30°C / 27°C | 35°C / 30°C | 18days (94 mm) Wet | 9h Good | 77% Humid | 7.5 Very High | Wet | View Details |
| August | 30°C / 27°C | 35°C / 30°C | 18days (78 mm) Wet | 9.6h Good | 77% Humid | 8.4 Very High | Wet | View Details |
| September | 29°C / 27°C | 34°C / 30°C | 22days (141 mm) Wet | 8.6h Good | 79% Humid | 7.8 Very High | Wet | View Details |
| October | 28°C / 26°C | 34°C / 30°C | 27days (267 mm) Wet | 8.2h Good | 82% Humid | 7.4 Very High | Wet | View Details |
| November | 28°C / 26°C | 33°C / 29°C | 24days (317 mm) Wet | 8.2h Good | 81% Humid | 6.8 High | Wet | View Details |
| December best | 28°C / 26°C | 31°C / 28°C | 16days (219 mm) Wet | 9.3h Good | 79% Humid | 6.8 High | Wet | View Details |
Monthly Temperatures
High Low
Line chart showing monthly temperatures. Jan: 28°C / 26°C . Feb: 28°C / 26°C . Mar: 29°C / 27°C . Apr: 30°C / 28°C . May: 30°C / 28°C . Jun: 30°C / 28°C . Jul: 30°C / 27°C . Aug: 30°C / 27°C . Sep: 29°C / 27°C . Oct: 28°C / 26°C . Nov: 28°C / 26°C . Dec: 28°C / 26°C .
Monthly Rainfall
Rainfall
Bar chart showing monthly rainfall. Jan: 100 mm. Feb: 54 mm. Mar: 36 mm. Apr: 118 mm. May: 130 mm. Jun: 75 mm. Jul: 94 mm. Aug: 78 mm. Sep: 141 mm. Oct: 267 mm. Nov: 317 mm. Dec: 219 mm.
Monthly Humidity
Humidity
Line chart showing monthly humidity. Jan: 78%. Feb: 76%. Mar: 76%. Apr: 77%. May: 78%. Jun: 76%. Jul: 77%. Aug: 77%. Sep: 79%. Oct: 82%. Nov: 81%. Dec: 79%.
Monthly Wind Speed
Wind Speed Gusts
Bar chart showing monthly wind speed. Jan: 22 km/h . Feb: 23 km/h . Mar: 21 km/h . Apr: 19 km/h . May: 20 km/h . Jun: 22 km/h . Jul: 23 km/h . Aug: 23 km/h . Sep: 23 km/h . Oct: 20 km/h . Nov: 21 km/h . Dec: 23 km/h .
Sea Temperature
Sea Temperature
Line chart showing monthly sea temperature. Jan: 28°C . Feb: 29°C . Mar: 30°C . Apr: 32°C . May: 32°C . Jun: 31°C . Jul: 31°C . Aug: 31°C . Sep: 30°C . Oct: 30°C . Nov: 30°C . Dec: 29°C .
UV Index
UV Index
Bar chart showing monthly UV index. Jan: UV 8. Feb: UV 9. Mar: UV 9. Apr: UV 9. May: UV 8. Jun: UV 7. Jul: UV 8. Aug: UV 8. Sep: UV 8. Oct: UV 7. Nov: UV 7. Dec: UV 7.
Frequently Asked Questions
Ko Samui has a population of approximately 50K.
The best months to visit Ko Samui are January, February, December, when temperatures are pleasant and rainfall is lower.
Ko Samui receives approximately 1629mm of rainfall annually across 198 rainy days.
Ko Samui is located in Thailand, in the Asia region.