Ko Samui Water Temperature

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Ko Samui is a Island close to Gulf of Thailand. May is the month with the highest water temperature at 87.1°F / 30.6°C.
The coldest month is January with an average water temperature of 81.9°F / 27.7°C.
February is the driest at 0in / 1.1mm and October the wettest month with 17.1in / 434.4mm.
With an average air temperature of 82.9°F / 28.3°C, April is the warmest month in a year. December is the coldest with 77.9°F / 25.5°C average air temperature.
The Climate is described as tropical monsoon climate. Best time to Visit would be in January, February, March, May, June, July, August, September.

Ko Samui Summary

Description Value
Current water temperature /
Warmest Month Water Temperature: May with 30.6°C / 87.1°F
Coldest Month Water Temperature: January with 27.7°C / 81.9°F
Warmest Month Air Temperature: April with 28.3°C / 82.9°F
Coldest Month Air Temperature: December with 25.5°C / 77.9°F
Wettest Month: October with 434.4mm / 17.1in
Driest Month: February with 1.1mm / 0in
Highest Humidity October with 87.6%
Lowest Humidity March with 75.2%
Best Time to Visit: January, February, March, May, June, July, August, September
Climate Classification tropical monsoon climate

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Ko Samui water temperature by month

Gulf of Thailand water temperature by month

Max. Water

Temperature (°C)

ø. Water

Temperature (°C)

Min. Water

Temperature (°C)

January

27.9 27.7 27.4

February

28.7 28.2 27.8

March

29.9 29.3 28.6

April

30.7 30.3 29.8

May

30.8 30.6 30.3

June

30.4 30.1 29.7

July

29.9 29.7 29.4

August

29.5 29.3 29.1

September

29.6 29.3 29.1

October

29.4 29.2 29.1

November

29.1 28.8 28.4

December

28.5 28.1 27.6

Gulf of Thailand water temperature by month

Max. Water

Temperature (°F)

ø. Water

Temperature (°F)

Min. Water

Temperature (°F)

January

82.2 81.9 81.3

February

83.7 82.8 82

March

85.8 84.7 83.5

April

87.3 86.5 85.6

May

87.4 87.1 86.5

June

86.7 86.2 85.5

July

85.8 85.5 84.9

August

85.1 84.7 84.4

September

85.3 84.7 84.4

October

84.9 84.6 84.4

November

84.4 83.8 83.1

December

83.3 82.6 81.7
The warmest water temperature are in May with around 87.1°F / 30.6°C. The coldest in January with an average water temperature of 81.9°F / 27.7°C.

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Ko Samui weather today & 14-day weather forecast

Date
Weather
Max. F
Min. F
Max. C
Min. C
Windspeed
Windir.
Precip.
Rainrisk
Rel. Humidity
Nov. 21
Moderate rain
83 °F
80°F
28 °C
26°C
1mph (2km/h)
northeast
1in (15mm)
85 %
88%
Nov. 22
Heavy rain
81 °F
80°F
27 °C
26°C
1mph (2km/h)
east-northeast
1in (35mm)
90 %
91%
Nov. 23
Heavy rain
82 °F
79°F
28 °C
26°C
2mph (3km/h)
east-northeast
1in (26mm)
90 %
90%
Nov. 24
Heavy rain
84 °F
81°F
29 °C
27°C
2mph (3km/h)
east-northeast
1in (19mm)
85 %
86%
Nov. 25
Heavy rain
84 °F
81°F
29 °C
27°C
2mph (3km/h)
east-northeast
1in (19mm)
85 %
86%
Nov. 26
Heavy rain
83 °F
81°F
29 °C
27°C
2mph (3km/h)
east-northeast
1in (29mm)
90 %
89%
Nov. 27
Heavy rain
83 °F
80°F
29 °C
27°C
1mph (2km/h)
east-northeast
1in (28mm)
90 %
89%
Date
Weather
Max. F
Min. F
Max. C
Min. C
Windspeed
Windir.
Precip.
Rainrisk
Rel. Humidity
Nov. 28
Heavy rain
83 °F
80°F
29 °C
27°C
1mph (2km/h)
east-northeast
1in (31mm)
90 %
88%
Nov. 29
Heavy rain
83 °F
80°F
28 °C
27°C
2mph (3km/h)
east-northeast
1in (34mm)
90 %
86%
Nov. 30
Heavy rain
83 °F
80°F
28 °C
27°C
2mph (3km/h)
northeast
1in (27mm)
90 %
84%
Dec. 01
Heavy rain
85 °F
73°F
29 °C
23°C
3mph (5km/h)
east-northeast
4in (96mm)
95 %
88%
Dec. 02
Heavy rain
85 °F
73°F
30 °C
23°C
4mph (6km/h)
east-northeast
5in (140mm)
100 %
88%
Dec. 03
Thunderstorm with heavy rain
85 °F
76°F
30 °C
24°C
4mph (7km/h)
east
1in (27mm)
90 %
79%
Dec. 04
Heavy rain
85 °F
73°F
29 °C
23°C
3mph (5km/h)
north-northeast
1in (35mm)
90 %
83%
Dec. 05
Heavy rain
83 °F
72°F
28 °C
22°C
2mph (3km/h)
north-northeast
1in (23mm)
90 %
85%
Dec. 06
Thunderstorm with heavy rain
87 °F
73°F
30 °C
23°C
3mph (5km/h)
east-northeast
1in (29mm)
90 %
76%

Ko Samui weather by month / climate table

Max.

Temperature

°C

ø.

Temperature

°C

Min.

Temperature

(°C)

Precip.

(mm)

Rainy Days

(d)

Rel. Humidity

(%)

January

28.8 25.6 23 79.3 10 81.1%

February

30.7 26.4 22.8 1.1 0 75.9%

March

31.8 27.5 23.5 85.7 3 75.2%

April

32.8 28.3 24.8 114.3 12 75.8%

May

31.9 27.7 25.2 258.7 27 80.2%

June

31.2 27.4 25 193.8 24 79.9%

July

31.1 27.2 24.8 192.7 24 79.1%

August

31.3 27.1 24.6 221.8 25 79.2%

September

30.9 26.5 24.3 284.6 27 82.9%

October

29.4 25.9 23.9 434.4 0 87.6%

November

28.6 25.8 23.8 391.5 27 87.2%

December

28.2 25.5 23.1 212 19 83.7%

Max.

Temperature

°F

ø.

Temperature

°F

Min.

Temperature

(°F)

Precip.

(in)

Rainy Days

(d)

Rel. Humidity

(%)

January

83.8 78.1 73.4 3.1 10 81.1%

February

87.3 79.5 73 0 0 75.9%

March

89.2 81.5 74.3 3.4 3 75.2%

April

91 82.9 76.6 4.5 12 75.8%

May

89.4 81.9 77.4 10.2 27 80.2%

June

88.2 81.3 77 7.6 24 79.9%

July

88 81 76.6 7.6 24 79.1%

August

88.3 80.8 76.3 8.7 25 79.2%

September

87.6 79.7 75.7 11.2 27 82.9%

October

84.9 78.6 75 17.1 0 87.6%

November

83.5 78.4 74.8 15.4 27 87.2%

December

82.8 77.9 73.6 8.3 19 83.7%
The warmest avg. temperature is around 82.9°F / 28.3°C, April is the month with the highest temperature. December is the coolest with 77.9°F / 25.5°C average air temperature. February is the month with the min. precipitation of 0in / 1.1mm and October with the max. precipitation in a year with 17.1in / 434.4mm.
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