Ko Samui Water Temperature

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Ko Samui is a Island close to Gulf of Thailand. May is the month with the hottest water temperature at 87.1°F / 30.6°C. The coldest month is January with an ø water temperature of 81.9°F / 27.7°C. February is the month with the lowest precipitation of 0in / 1.1mm and October with the highest precipitation in a year with 17.1in / 434.4mm. The avg. air 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. January, February, March, May, June, July, August, September would be the best time to visit. tropical monsoon climate would be the climate here.

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

°C

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

°F

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 hottest water temperature typically reached 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

7-day weather forecast
+9-day forecast

7-day weather forecast

Date	Weather	Max. F Min. F	Max. C Min. C	Windspeed Windir.	Precip. Rainrisk	Rel. Humidity
Dec. 21	Few clouds	83 °F 76°F	28 °C 25°C	1mph (2km/h) northeast	0in (0mm) 0 %	77%
Dec. 22	Broken clouds	84 °F 78°F	29 °C 26°C	1mph (2km/h) northeast	0in (0mm) 0 %	78%
Dec. 23	Broken clouds	84 °F 77°F	29 °C 25°C	1mph (2km/h) northeast	0in (0mm) 0 %	74%
Dec. 24	Scattered clouds	84 °F 76°F	29 °C 24°C	1mph (2km/h) east	0in (0mm) 0 %	73%
Dec. 25	Broken clouds	84 °F 76°F	29 °C 25°C	1mph (2km/h) east	0in (0mm) 0 %	79%
Dec. 26	Broken clouds	83 °F 77°F	28 °C 25°C	1mph (2km/h) northeast	0in (0mm) 0 %	83%
Dec. 27	Moderate rain	83 °F 79°F	29 °C 26°C	1mph (2km/h) east-northeast	0in (7mm) 70 %	84%

+9-day forecast

Date	Weather	Max. F Min. F	Max. C Min. C	Windspeed Windir.	Precip. Rainrisk	Rel. Humidity
Dec. 28	Heavy rain	83 °F 78°F	28 °C 26°C	1mph (2km/h) east-northeast	1in (18mm) 85 %	87%
Dec. 29	Moderate rain	82 °F 79°F	28 °C 26°C	2mph (3km/h) east-northeast	1in (13mm) 80 %	86%
Dec. 30	Heavy rain	83 °F 79°F	28 °C 26°C	1mph (2km/h) east-northeast	1in (15mm) 85 %	85%
Dec. 31	Thunderstorm with rain	87 °F 77°F	30 °C 25°C	1mph (2km/h) east-northeast	1in (14mm) 80 %	84%
Jan. 01	Thunderstorm with rain	87 °F 76°F	30 °C 25°C	2mph (3km/h) east-northeast	0in (4mm) 60 %	75%
Jan. 02	Thunderstorm with rain	87 °F 76°F	30 °C 25°C	2mph (3km/h) east-southeast	0in (3mm) 50 %	73%
Jan. 03	Few clouds	87 °F 75°F	30 °C 24°C	2mph (3km/h) east	0in (2mm) 40 %	76%
Jan. 04	Scattered clouds	87 °F 76°F	30 °C 24°C	2mph (4km/h) south-southwest	0in (1mm) 20 %	73%
Jan. 05	Broken clouds	87 °F 75°F	30 °C 24°C	2mph (3km/h) southeast	0in (0mm) 20 %	73%

Ko Samui weather by month / climate table

°C

	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%

°F

	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%

February is the most draught at 0in / 1.1mm and October the month with the most rain around 17.1in / 434.4mm. The avg. temperature is around 82.9°F / 28.3°C, April is the hottest month in a year. December is the coolest with 77.9°F / 25.5°C avg. temperature.

Gulf of Thailand