Weather comparison

Phuket or Koh Samui? The weather compared

Phuket is 1.3 °C warmer by day over the year. Koh Samui gets 0.7 more hours of sunshine a day. Best time: Phuket November – March, Koh Samui January – March.

Holiday weather score by month

Phuket
1. 75
2. 76
3. 64
4. 56
5. 57
6. 59
7. 60
8. 60
9. 61
10. 60
11. 61
12. 70
Koh Samui
1. 83
2. 93
3. 90
4. 77
5. 62
6. 61
7. 61
8. 61
9. 62
10. 66
11. 66
12. 71

Month by month

Holiday weather score, daytime high and sea temperature. Where one is clearly ahead, its month is highlighted.

Month	Phuket	Koh Samui
JanuaryJan	7533° / 28°	8329° / 28°
FebruaryFeb	7634° / 29°	9330° / 28°
MarchMar	6434° / 29°	9031° / 29°
AprilApr	5634° / 30°	7732° / 30°
MayMay	5733° / 30°	6233° / 31°
JuneJun	5933° / 30°	6133° / 30°
JulyJul	6032° / 30°	6133° / 30°
AugustAug	6032° / 30°	6133° / 29°
SeptemberSep	6132° / 29°	6232° / 29°
OctoberOct	6032° / 29°	6631° / 29°
NovemberNov	6132° / 29°	6630° / 29°
DecemberDec	7032° / 29°	7130° / 28°

Phuket or Koh Samui: quick answers

Which is warmer, Phuket or Koh Samui?

Over the year, Phuket is 1.3 °C warmer by day (32.8 °C against 31.4 °C on average).

Where is the sea warmer, Phuket or Koh Samui?

The sea is about equally warm at both.

Phuket or Koh Samui in winter?

From December to February, Koh Samui has the better holiday weather: 82 against 74 points.

Phuket or Koh Samui in summer?

From June to August, both have about the same holiday weather (60 and 61 points).

More about both

Phuket Koh Samui

More comparisons

Climate averages 1996–2025 (sunshine partly WMO station normals 1991–2020), not a forecast. Data: Copernicus ERA5 / ERA5-Land via Open-Meteo.com (CC BY 4.0), NOAA OISST, WMO 1991–2020 (NOAA NCEI), GeoNames (CC BY 4.0). Sources & licences