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Monthly climate in Ko Samui, Surat Thani, Thailand

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification Ko Samui features a tropical monsoon climate (Am).Temperatures typically range between 27 °C (80 °F) and 28 °C (84 °F) through the year, but rarely can drop to 24 °C (76 °F) or can rise to as high as 32 °C (89 °F).The average annual precipitation amounts to about 1681 mm (66.2 inches) and receives 208 rainy days on the 1 mm (0.04 inches) threshold annually.Ko Samui enjoys an average of 3638 hours of sunshine throughout the year, and daylight varies from 11 hours 33 minutes to 12 hours 39 minutes per day.

Monthly average temperatures in Ko Samui, Surat Thani, Thailand §

The warmest months in Ko Samui are May, June and July, with daily mean temperatures ranging from 28 to 28 °C (83 - 84 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from 27 to 27 °C (80 - 81 °F) throughout the day. On average each year, Ko Samui experiences 329 days above 25 °C (77.0 °F) and 0 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Ko Samui, Surat Thani, Thailand.Generated using Copernicus Climate Change Service information.Data for period from January 2017 to June 2022.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Maximum 28°C
(83°F)		 28°C
(83°F)		 30°C
(86°F)		 31°C
(88°F)		 32°C
(89°F)		 32°C
(89°F)		 31°C
(88°F)		 31°C
(89°F)		 30°C
(86°F)		 30°C
(85°F)		 29°C
(85°F)		 29°C
(84°F)
Mean maximum 28°C
(83°F)		 28°C
(83°F)		 29°C
(85°F)		 30°C
(87°F)		 31°C
(88°F)		 31°C
(87°F)		 30°C
(87°F)		 30°C
(87°F)		 30°C
(86°F)		 29°C
(85°F)		 29°C
(84°F)		 28°C
(83°F)
Average high 27°C
(81°F)		 27°C
(82°F)		 28°C
(83°F)		 29°C
(84°F)		 29°C
(85°F)		 29°C
(85°F)		 29°C
(85°F)		 29°C
(85°F)		 29°C
(84°F)		 28°C
(83°F)		 28°C
(83°F)		 27°C
(82°F)
Daily mean 27°C
(80°F)		 27°C
(81°F)		 28°C
(82°F)		 28°C
(83°F)		 28°C
(84°F)		 28°C
(84°F)		 28°C
(83°F)		 28°C
(83°F)		 28°C
(82°F)		 27°C
(81°F)		 27°C
(81°F)		 27°C
(80°F)
Average low 26°C
(79°F)		 26°C
(80°F)		 27°C
(81°F)		 27°C
(81°F)		 28°C
(82°F)		 28°C
(82°F)		 27°C
(82°F)		 27°C
(81°F)		 27°C
(81°F)		 26°C
(80°F)		 26°C
(80°F)		 26°C
(79°F)
Mean minimum 25°C
(78°F)		 25°C
(78°F)		 26°C
(79°F)		 26°C
(79°F)		 26°C
(80°F)		 26°C
(80°F)		 26°C
(80°F)		 26°C
(80°F)		 26°C
(79°F)		 25°C
(78°F)		 25°C
(78°F)		 25°C
(77°F)
Minimum 24°C
(76°F)		 25°C
(77°F)		 25°C
(78°F)		 25°C
(77°F)		 26°C
(79°F)		 26°C
(79°F)		 26°C
(80°F)		 26°C
(79°F)		 26°C
(78°F)		 25°C
(77°F)		 25°C
(77°F)		 24°C
(76°F)

Compare climate in Ko Samui with other places

Compare temperature, precipitation, sunshine, UV index in Ko Samui, Surat Thani, Thailand with other places around the world.

Monthly average precipitation in Ko Samui, Surat Thani, Thailand §

Ko Samui usually has the most precipitation in October, November and December, with an average of 23 rainy days and 261 mm (10.3 inches) of precipitation per month.The driest months in Ko Samui are February, March and July. On average, 52 mm (2.0 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Ko Samui, Surat Thani, Thailand.Generated using Copernicus Climate Change Service information.Data for period from January 2017 to January 2022.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Average precipitation mm (inches) 144 (5.7) 39 (1.5) 38 (1.5) 144 (5.7) 126 (5.0) 96 (3.8) 79 (3.1) 80 (3.1) 151 (5.9) 241 (9.5) 336 (13.2) 207 (8.1)
Average precipitation days (≥ 1 mm) 13 8 7 15 22 18 17 18 21 28 24 17

Monthly sunshine hours in Ko Samui, Surat Thani, Thailand §

The sunniest months in Ko Samui are March, April and May, when the sun shines an average of 10 hours 48 minutes a day.Least sunny months in Ko Samui: January, September and October receive an average of 8 hours 57 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Ko Samui, Surat Thani, Thailand.Generated using Copernicus Atmosphere Monitoring Service information.Data for period from January 2017 to January 2022.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Mean monthly sunshine hours 251 307 345 317 331 307 313 299 285 286 289 301
Mean daily daylight hours 11h 37m 11h 48m 12h 3m 12h 19m 12h 32m 12h 39m 12h 36m 12h 24m 12h 9m 11h 53m 11h 40m 11h 33m

Solar UV radiation in Ko Samui, Surat Thani, Thailand §

Ko Samui experiences the highest level of ultraviolet (UV) radiation in March, April and September, when the maximum UV index can reach values of 14 - 15, which corresponds to the Extreme category of sun exposure.January, November and December are in the Extreme exposure category. In these months, the maximum values of the UV index do not exceed 11. For more detailed information, check out our hourly Ko Samui UV Index data.

Average daily maximum UV levels by month for Ko Samui, Surat Thani, Thailand.Generated using Copernicus Atmosphere Monitoring Service information.Data for period from January 2022 to January 2023.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
UV Index (month maximum) 11 14 15 15 14 13 14 14 14 14 11 11