Ko Samui Weather

Check the weather in Ko Samui, Thailand to plan the best time to visit and what clothes to pack on your holiday. Check the Ko Samui Weather Forecast for an outlook of the days ahead and the monthly climate statistics from the Ko Samui Weather Averages.

Ko Samui Weather Averages

Check the monthly Ko Samui weather averages, including the usual day-time maximum and night-time minimum temperatures, monthly rainfall figures, the average number of daily hours of sunshine and daylight. Don't forget to look at the heat and humidity discomfort indicator and the UV index so you're aware of what sun protection you will need.

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Daytime Max Temperature 30°C (86°F) Daytime Max Temperature in January in Ko Samui 31°C (88°F) Daytime Max Temperature in February in Ko Samui 33°C (91°F) Daytime Max Temperature in March in Ko Samui 34°C (93°F) Daytime Max Temperature in April in Ko Samui 34°C (93°F) Daytime Max Temperature in May in Ko Samui 33°C (91°F) Daytime Max Temperature in June in Ko Samui 32°C (90°F) Daytime Max Temperature in July in Ko Samui 32°C (90°F) Daytime Max Temperature in August in Ko Samui 32°C (90°F) Daytime Max Temperature in September in Ko Samui 31°C (88°F) Daytime Max Temperature in October in Ko Samui 29°C (84°F) Daytime Max Temperature in November in Ko Samui 29°C (84°F) Daytime Max Temperature in December in Ko Samui
Night-time Min Temperature 21°C (70°F) Night-time Min Temperature in January in Ko Samui 21°C (70°F) Night-time Min Temperature in February in Ko Samui 22°C (72°F) Night-time Min Temperature in March in Ko Samui 23°C (73°F) Night-time Min Temperature in April in Ko Samui 24°C (75°F) Night-time Min Temperature in May in Ko Samui 24°C (75°F) Night-time Min Temperature in June in Ko Samui 23°C (73°F) Night-time Min Temperature in July in Ko Samui 23°C (73°F) Night-time Min Temperature in August in Ko Samui 23°C (73°F) Night-time Min Temperature in September in Ko Samui 23°C (73°F) Night-time Min Temperature in October in Ko Samui 22°C (72°F) Night-time Min Temperature in November in Ko Samui 22°C (72°F) Night-time Min Temperature in December in Ko Samui
Sunshine Hours (Daily) 7 Hours of Bright Sunshine in January in Ko Samui 9 Hours of Bright Sunshine in February in Ko Samui 8 Hours of Bright Sunshine in March in Ko Samui 8 Hours of Bright Sunshine in April in Ko Samui 6 Hours of Bright Sunshine in May in Ko Samui 6 Hours of Bright Sunshine in June in Ko Samui 6 Hours of Bright Sunshine in July in Ko Samui 6 Hours of Bright Sunshine in August in Ko Samui 6 Hours of Bright Sunshine in September in Ko Samui 6 Hours of Bright Sunshine in October in Ko Samui 6 Hours of Bright Sunshine in November in Ko Samui 6 Hours of Bright Sunshine in December in Ko Samui
Monthly Rainfall 183 mm (7.2 inches) Monthly Rainfall in January in Ko Samui 53 mm (2.1 inches) Monthly Rainfall in February in Ko Samui 67 mm (2.6 inches) Monthly Rainfall in March in Ko Samui 62 mm (2.4 inches) Monthly Rainfall in April in Ko Samui 136 mm (5.4 inches) Monthly Rainfall in May in Ko Samui 87 mm (3.4 inches) Monthly Rainfall in June in Ko Samui 130 mm (5.1 inches) Monthly Rainfall in July in Ko Samui 114 mm (4.5 inches) Monthly Rainfall in August in Ko Samui 120 mm (4.7 inches) Monthly Rainfall in September in Ko Samui 272 mm (10.7 inches) Monthly Rainfall in October in Ko Samui 461 mm (18.1 inches) Monthly Rainfall in November in Ko Samui 242 mm (9.5 inches) Monthly Rainfall in December in Ko Samui
Days with some Rainfall 10 Days with some Rainfall in January in Ko Samui 5 Days with some Rainfall in February in Ko Samui 5 Days with some Rainfall in March in Ko Samui 8 Days with some Rainfall in April in Ko Samui 17 Days with some Rainfall in May in Ko Samui 16 Days with some Rainfall in June in Ko Samui 17 Days with some Rainfall in July in Ko Samui 17 Days with some Rainfall in August in Ko Samui 17 Days with some Rainfall in September in Ko Samui 20 Days with some Rainfall in October in Ko Samui 19 Days with some Rainfall in November in Ko Samui 13 Days with some Rainfall in December in Ko Samui
Heat and Humidity Discomfort High Heat & Humidity in January in Ko Samui High Heat & Humidity in February in Ko Samui Very High Heat & Humidity in March in Ko Samui Very High Heat & Humidity in April in Ko Samui Very High Heat & Humidity in May in Ko Samui Very High Heat & Humidity in June in Ko Samui Very High Heat & Humidity in July in Ko Samui Very High Heat & Humidity in August in Ko Samui Very High Heat & Humidity in September in Ko Samui High Heat & Humidity in October in Ko Samui High Heat & Humidity in November in Ko Samui Moderate Heat & Humidity in December in Ko Samui
UV Index (Maximum) UV (Maximum) Index 11 (Extreme) in January in Ko Samui UV (Maximum) Index 11+ (Extreme) in February in Ko Samui UV (Maximum) Index 11+ (Extreme) in March in Ko Samui UV (Maximum) Index 11+ (Extreme) in April in Ko Samui UV (Maximum) Index 11+ (Extreme) in May in Ko Samui UV (Maximum) Index 11+ (Extreme) in June in Ko Samui UV (Maximum) Index 11+ (Extreme) in July in Ko Samui UV (Maximum) Index 11+ (Extreme) in August in Ko Samui UV (Maximum) Index 11+ (Extreme) in September in Ko Samui UV (Maximum) Index 11+ (Extreme) in October in Ko Samui UV (Maximum) Index 11 (Extreme) in November in Ko Samui UV (Maximum) Index 10 (Very High) in December in Ko Samui
Sea Temperature 28°C (82°F) Sea Temperature in January in Ko Samui 28°C (82°F) Sea Temperature in February in Ko Samui 29°C (84°F) Sea Temperature in March in Ko Samui 30°C (86°F) Sea Temperature in April in Ko Samui 30°C (86°F) Sea Temperature in May in Ko Samui 30°C (86°F) Sea Temperature in June in Ko Samui 29°C (84°F) Sea Temperature in July in Ko Samui 29°C (84°F) Sea Temperature in August in Ko Samui 29°C (84°F) Sea Temperature in September in Ko Samui 29°C (84°F) Sea Temperature in October in Ko Samui 29°C (84°F) Sea Temperature in November in Ko Samui 28°C (82°F) Sea Temperature in December in Ko Samui
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Holiday Deals to Ko Samui

Thailand Weather by Month

Select a month from the list below to see the Thailand weather for a particular month. The monthly weather averages are the best indication of conditions in each month and are based on long-term (30 year) climate statistics.

January
February
March

April
May
June

July
August
September

October
November
December

Thailand Holiday Destinations
Thinking about travelling to Thailand? Find out more about the weather in Thailand, simply select a holiday destination from the list below:
Bangkok
Cha Am
Chiang Mai
Chiang Rai
Hat Yai
Hua Hin
Kanchanaburi
Khao Lak
Khao Sok National Park
Khao Yai National Park
Ko Chang
Krabi
Mae Hong Son
Nakhon Ratchasima
Nan
Nong Khai
Pattaya
Phi Phi
Phuket
Sukhothai
Surat Thani
Ubon Ratchathani
Udon Thani