Ko Samui Weather Year-Round — Best Time to Visit
Ko Samui, Thailand has hot weather year-round. The best time to visit is February (score: 85/100). Annual average high: 29°C, total rainfall: 1532mm.
When is the best time to visit Ko Samui?
85
February is the best month to visit Ko Samui with a travel score of 85/100 (Excellent).
Expect highs of 28.4°C, 6 rain days, and 10.8 hours of daily sunshine.
View February weather details →Travel Score by Month
80
Jan
85
Feb
82
Mar
77
Apr
66
May
69
Jun
68
Jul
69
Aug
65
Sep
65
Oct
64
Nov
74
Dec
Excellent (80+)
Good (60-79)
Mixed (40-59)
Poor (<40)
What are the average temperatures in Ko Samui each month?
29°C
Avg High
26.2°C
Avg Low
1532mm
Annual Rain
How much rain does Ko Samui get?
Ko Samui receives 1532mm of rain annually. The wettest month is typically November with 291mm, while February is the driest.
What is the weather like each month in Ko Samui?
January
80
28°C
Low: 25°C
10 rain days
Excellent
February
Best time to visit85
28°C
Low: 26°C
6 rain days
Excellent
March
82
29°C
Low: 27°C
9 rain days
Excellent
April
77
30°C
Low: 27°C
12 rain days
Good
May
66
30°C
Low: 27°C
20 rain days
Good
June
69
30°C
Low: 27°C
18 rain days
Good
July
68
30°C
Low: 27°C
18 rain days
Good
August
69
30°C
Low: 27°C
18 rain days
Good
September
65
29°C
Low: 26°C
22 rain days
Good
October
65
28°C
Low: 26°C
25 rain days
Good
November
64
28°C
Low: 26°C
21 rain days
Good
December
74
28°C
Low: 25°C
14 rain days
Good
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Data based on 1994–2024 averages · Last updated: 2024-12-31