When is the best time to go to Ko Samui
The chart above shows the best time of year to visit Ko Samui, Thailand. These are based on an analysis of weather averages such as temperature, rainfall and number of hours of sunshine. These ratings are based solely on the climate and do not take into account other factors such as accommodation prices and how busy it is likely to be.
Average temperatures in Ko Samui
Ko Samui weather by month
Please note our recommendations for when to visit Ko Samui are based solely on the weather and do not take into accounts accommodation prices, how busy it will be and what events are on.
January
| Temp | Rain | Sunshine | Day length | Sea temp |
|---|---|---|---|---|
| 26°C | 123mm | 7.6hrs | 12.4hrs | 28°C |
Hot, humid and wet weather often prevails in Ko Samui during the month of January
Although outside the main holiday season, there is still plenty of quite acceptable weather around this time of year. This makes it an okay time to visit Ko Samui.
January is in the winter in Ko Samui and is typically the coldest month of the year. Daytime maximum temperatures average around a steamy 29°C (84°F), whilst at night 22°C (72°F) is normal.
On average January is the driest month of the year in Ko Samui with around 123mm 4.8 inches of rain making it a wet time to visit. This rainfall is typically spread over 10 days, although this may vary considerably.
On the flip side this corresponds to an average of 7.6 hours of sunshine per day.
February
| Temp | Rain | Sunshine | Day length | Sea temp |
|---|---|---|---|---|
| 26°C | 39mm | 8.7hrs | 12.5hrs | 28°C |
February in Ko Samui is generally reasonably dry with the temperature being hot.
It is perhaps the perfect month to visit Ko Samui, with some inordinately good weather at this time of year.
February is in the winter in Ko Samui and is typically the 2nd coldest month of the year. Daytime maximum temperatures average around a steamy 29°C (85°F), whilst at night 23°C (74°F) is normal.
On average February is the 2nd driest month of the year in Ko Samui with around 39mm 1.5 inches of rain making it a reasonably dry time to visit. This rainfall is typically spread over 5 days, although this may vary considerably.
On the flip side this corresponds to an average of 8.7 hours of sunshine per day.
Ko Samui weather in February »
March
| Temp | Rain | Sunshine | Day length | Sea temp |
|---|---|---|---|---|
| 27°C | 54mm | 8.7hrs | 12.8hrs | 29°C |
The weather in March in Ko Samui is characteristically hot, humid and reasonably dry.
Although outside the main holiday season, there is still plenty of reasonably acceptable weather around this time of year. This makes it an okay time to visit Ko Samui.
March is in the spring in Ko Samui and is typically the 3rd coldest month of the year. Daytime maximum temperatures average around a steamy 30°C (87°F), whilst at night 24°C (75°F) is normal.
On average March is the 3rd driest month of the year in Ko Samui with around 54mm 2.1 inches of rain making it a reasonably dry time to visit. This rainfall is typically spread over 5 days, although this may vary considerably.
On the flip side this corresponds to an average of 8.7 hours of sunshine per day.
April
| Temp | Rain | Sunshine | Day length | Sea temp |
|---|---|---|---|---|
| 29°C | 85mm | 8.3hrs | 13hrs | 30°C |
Ko Samui's weather in April is typically very hot, humid and a little damp in nature.
Although outside the main holiday season, there is still plenty of quite acceptable weather around this time of year. This makes it an okay time to visit Ko Samui.
April is in the spring in Ko Samui and is typically the 4th coldest month of the year. Daytime maximum temperatures average around a steamy 32°C (89°F), whilst at night 25°C (77°F) is normal.
On average April is the 4th driest month of the year in Ko Samui with around 85mm 3.3 inches of rain making it a a little damp time to visit. This rainfall is typically spread over 8 days, although this may vary considerably.
On the flip side this corresponds to an average of 8.3 hours of sunshine per day.
May
| Temp | Rain | Sunshine | Day length | Sea temp |
|---|---|---|---|---|
| 29°C | 172mm | 6.7hrs | 13.3hrs | 30°C |
May is a wet, humid month in Ko Samui and the temperature is generally very hot.
Based on weather alone, this is probably a time of year to avoid going to Ko Samui for your holidays. The weather is often pretty bad and not conducive to spending time outdoors.
May is in the spring in Ko Samui and is typically the 5th coldest month of the year. Daytime maximum temperatures average around a steamy 32°C (90°F), whilst at night 25°C (76°F) is normal.
On average May is the 5th driest month of the year in Ko Samui with around 172mm 6.8 inches of rain making it a wet time to visit. This rainfall is typically spread over 17 days, although this may vary considerably.
On the flip side this corresponds to an average of 6.7 hours of sunshine per day.
June
| Temp | Rain | Sunshine | Day length | Sea temp |
|---|---|---|---|---|
| 28°C | 118mm | 6hrs | 12.4hrs | 30°C |
The weather in June in Ko Samui is characteristically hot, humid and damp.
Based on weather alone, this is probably a time of year to avoid going to Ko Samui for your holidays. The weather is often pretty bad and not conducive to spending time outdoors.
June is in the summer in Ko Samui and is typically the 6th coldest month of the year. Daytime maximum temperatures average around a steamy 32°C (89°F), whilst at night 24°C (76°F) is normal.
On average June is the 6th driest month of the year in Ko Samui with around 118mm 4.6 inches of rain making it a damp time to visit. This rainfall is typically spread over 16 days, although this may vary considerably.
On the flip side this corresponds to an average of 6 hours of sunshine per day.
July
| Temp | Rain | Sunshine | Day length | Sea temp |
|---|---|---|---|---|
| 28°C | 146mm | 6.2hrs | 12.5hrs | 29°C |
July in Ko Samui is generally wet with the temperature being hot.
Based on weather alone, this is probably a time of year to avoid going to Ko Samui for your holidays. The weather is often relatively bad and not conducive to spending time outdoors.
July is in the summer in Ko Samui and is typically the 6th warmest month of the year. Daytime maximum temperatures average around a steamy 31°C (88°F), whilst at night 24°C (75°F) is normal.
On average July is the 6th wettest month of the year in Ko Samui with around 146mm 5.7 inches of rain making it a wet time to visit. This rainfall is typically spread over 17 days, although this may vary considerably.
On the flip side this corresponds to an average of 6.2 hours of sunshine per day.
August
| Temp | Rain | Sunshine | Day length | Sea temp |
|---|---|---|---|---|
| 28°C | 137mm | 5.9hrs | 12.8hrs | 29°C |
The weather in August in Ko Samui is characteristically hot, humid and wet.
Based on weather alone, this is probably a time of year to avoid going to Ko Samui for your holidays. The weather is often relatively bad and not conducive to spending time outdoors.
August is in the summer in Ko Samui and is typically the 5th warmest month of the year. Daytime maximum temperatures average around a steamy 31°C (88°F), whilst at night 24°C (75°F) is normal.
On average August is the 5th wettest month of the year in Ko Samui with around 137mm 5.4 inches of rain making it a wet time to visit. This rainfall is typically spread over 17 days, although this may vary considerably.
On the flip side this corresponds to an average of 5.9 hours of sunshine per day.
September
| Temp | Rain | Sunshine | Day length | Sea temp |
|---|---|---|---|---|
| 28°C | 141mm | 5.9hrs | 13hrs | 29°C |
Ko Samui's weather in September is typically hot, humid and wet in nature.
Based on weather alone, this is probably a time of year to avoid going to Ko Samui for your holidays. The weather is often not a good and not conducive to spending time outdoors.
September is in the fall / autumn in Ko Samui and is typically the 4th warmest month of the year. Daytime maximum temperatures average around a steamy 31°C (87°F), whilst at night 24°C (75°F) is normal.
On average September is the 4th wettest month of the year in Ko Samui with around 141mm 5.5 inches of rain making it a wet time to visit. This rainfall is typically spread over 17 days, although this may vary considerably.
On the flip side this corresponds to an average of 5.9 hours of sunshine per day.
Ko Samui weather in September »
October
| Temp | Rain | Sunshine | Day length | Sea temp |
|---|---|---|---|---|
| 27°C | 275mm | 6.2hrs | 13.3hrs | 29°C |
October is a very wet, humid month in Ko Samui and the temperature is generally hot.
Although outside the main holiday season, there is still plenty of relatively acceptable weather around this time of year. This makes it an okay time to visit Ko Samui.
October is in the fall / autumn in Ko Samui and is typically the 3rd warmest month of the year. Daytime maximum temperatures average around a steamy 30°C (86°F), whilst at night 23°C (74°F) is normal.
On average October is the 3rd wettest month of the year in Ko Samui with around 275mm 10.8 inches of rain making it a very wet time to visit. This rainfall is typically spread over 20 days, although this may vary considerably.
On the flip side this corresponds to an average of 6.2 hours of sunshine per day.
November
| Temp | Rain | Sunshine | Day length | Sea temp |
|---|---|---|---|---|
| 26°C | 463mm | 6.2hrs | 12.4hrs | 29°C |
Ko Samui's weather in November is typically hot, humid and very wet in nature.
Although outside the main holiday season, there is still plenty of quite acceptable weather around this time of year. This makes it an okay time to visit Ko Samui.
November is in the fall / autumn in Ko Samui and is typically the 2nd warmest month of the year. Daytime maximum temperatures average around a steamy 29°C (84°F), whilst at night 23°C (73°F) is normal.
On average November is the 2nd wettest month of the year in Ko Samui with around 463mm 18.2 inches of rain making it a very wet time to visit. This rainfall is typically spread over 19 days, although this may vary considerably.
On the flip side this corresponds to an average of 6.2 hours of sunshine per day.
Ko Samui weather in November »
December
| Temp | Rain | Sunshine | Day length | Sea temp |
|---|---|---|---|---|
| 26°C | 188mm | 7hrs | 12.5hrs | 28°C |
December in Ko Samui is generally wet with the temperature being hot.
Although outside the main holiday season, there is still plenty of quite acceptable weather around this time of year. This makes it an okay time to visit Ko Samui.
December is in the winter in Ko Samui and is typically the warmest month of the year. Daytime maximum temperatures average around a steamy 29°C (83°F), whilst at night 22°C (72°F) is normal.
On average December is the wettest month of the year in Ko Samui with around 188mm 7.4 inches of rain making it a wet time to visit. This rainfall is typically spread over 13 days, although this may vary considerably.
On the flip side this corresponds to an average of 7 hours of sunshine per day.
Other monthly averages
Ko Samui weather stats
| Hottest month: | April | 31.6°C 88.9°F |
|---|---|---|
| Driest month: | February | 39mm 1.5ins |
| Sunniest month: | February | 8.7hrs |
| Coldest month: | January | 28.4°C 83.1°F |
| Wettest month: | November | 463mm 18.2ins |
| Warmest sea: | May | 30.2°C 86.4°F |
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