Koh Samui weather in September

Planning a getaway to Koh Samui this September and curious about the weather you should prepare for? Discover all the vital details you need on this page, solving your puzzle:

What is the weather like in Koh Samui in September?

Koh Samui is a region in Thailand. September in Koh Samui generally has temperatures that range from warm to very warm, with precipitation levels ranging from high to heavy.

The average maximum daytime temperatures vary from warm in Chaweng Beach at 30°C to very warm in Suratthani at 32°C. Nighttime temperatures generally drop to 25°C in Suratthani and 27°C in Chaweng Beach. The temperatures mentioned for daytime and nighttime are general averages. However there can be days that surpass these temperatures. So equip yourself with clothing that can handle the potential heat.

In September, precipitation varies across different areas. From high rainfall in Laem Set Beach with an average of 143 mm to heavy rainfall in Suratthani with 208 mm. The city Chaweng Beach usually sees around 145 hours of sunlight, indicating a moderately sunny period.

For a closer look at September's conditions in Koh Samui, see the map below. For a more detailed look at Koh Samui's yearly weather, check out our Koh Samui climate page.

Where to go in Koh Samui in September

Find the average weather conditions in September for the most popular destinations in Koh Samui on the map below. Click on a destination dot for more detailed information.

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Legend perfect weather pleasant tolerable unpleasant poor
Perfect weather is subjective. On this map perfect weather has been defined with temperatures between 20°C and 29°C and not too much precipitation (less than 90 mm a month).

Popular destinations in Koh Samui

What is the weather like in September for the 5 most popular destinations in Koh Samui?

Average weather in Chaweng Beach

In September Chaweng Beach generally has high temperatures with maximum daytime temperatures around 30°C, minimum nighttime temperatures around 27°C and heavy monthly rainfall. So on average the conditions are tolerable that month.

Chaweng Beach
minimum temparatureMax temperature minimum temparatureMax temp
maximum temparatureMin temperature maximum temparatureMin temp
sun hoursMonthly sun hours sun hoursSun hours
precipitationMonthly rainfall precipitationRainfall
rain daysMonthly rainy days rain daysRainy days
conditionsWeather conditions conditionsWeather
<<   August August
<<  
30°C 
27°C 
152 hours 
107 mm 
17 days 
30°C 
27°C 
145 hours 
162 mm 
18 days 
October   >> October
>>  
29°C 
26°C 
146 hours 
302 mm 
20 days 
poor 
Climate in Chaweng Beach

Average weather in Lamai Beach

In September Lamai Beach generally has high temperatures with maximum daytime temperatures around 30°C, minimum nighttime temperatures around 27°C and high monthly rainfall. So on average the conditions are tolerable that month.

Lamai Beach
minimum temparatureMax temperature minimum temparatureMax temp
maximum temparatureMin temperature maximum temparatureMin temp
sun hoursMonthly sun hours sun hoursSun hours
precipitationMonthly rainfall precipitationRainfall
rain daysMonthly rainy days rain daysRainy days
conditionsWeather conditions conditionsWeather
<<   August August
<<  
30°C 
27°C 
152 hours 
99 mm 
17 days 
30°C 
27°C 
145 hours 
152 mm 
18 days 
October   >> October
>>  
29°C 
26°C 
146 hours 
296 mm 
20 days 
poor 
Climate in Lamai Beach

Average weather in Bophut

In September Bophut generally has high temperatures with maximum daytime temperatures around 30°C, minimum nighttime temperatures around 27°C and heavy monthly rainfall. So on average the conditions are tolerable that month.

Bophut
minimum temparatureMax temperature minimum temparatureMax temp
maximum temparatureMin temperature maximum temparatureMin temp
sun hoursMonthly sun hours sun hoursSun hours
precipitationMonthly rainfall precipitationRainfall
rain daysMonthly rainy days rain daysRainy days
conditionsWeather conditions conditionsWeather
<<   August August
<<  
30°C 
27°C 
152 hours 
111 mm 
17 days 
30°C 
27°C 
145 hours 
166 mm 
18 days 
October   >> October
>>  
29°C 
26°C 
146 hours 
304 mm 
20 days 
poor 
Climate in Bophut

Average weather in Choeng Mon Beach

In September Choeng Mon Beach generally has high temperatures with maximum daytime temperatures around 30°C, minimum nighttime temperatures around 27°C and heavy monthly rainfall. So on average the conditions are tolerable that month.

Choeng Mon Beach
minimum temparatureMax temperature minimum temparatureMax temp
maximum temparatureMin temperature maximum temparatureMin temp
sun hoursMonthly sun hours sun hoursSun hours
precipitationMonthly rainfall precipitationRainfall
rain daysMonthly rainy days rain daysRainy days
conditionsWeather conditions conditionsWeather
<<   August August
<<  
30°C 
27°C 
152 hours 
113 mm 
17 days 
30°C 
27°C 
145 hours 
170 mm 
18 days 
October   >> October
>>  
29°C 
26°C 
146 hours 
306 mm 
20 days 
poor 
Climate in Choeng Mon Beach

Average weather in Mae Nam Beach

In September Mae Nam Beach generally has high temperatures with maximum daytime temperatures around 30°C, minimum nighttime temperatures around 27°C and heavy monthly rainfall. So on average the conditions are tolerable that month.

Mae Nam Beach
minimum temparatureMax temperature minimum temparatureMax temp
maximum temparatureMin temperature maximum temparatureMin temp
sun hoursMonthly sun hours sun hoursSun hours
precipitationMonthly rainfall precipitationRainfall
rain daysMonthly rainy days rain daysRainy days
conditionsWeather conditions conditionsWeather
<<   August August
<<  
30°C 
27°C 
152 hours 
111 mm 
17 days 
30°C 
27°C 
145 hours 
166 mm 
18 days 
October   >> October
>>  
29°C 
26°C 
146 hours 
303 mm 
20 days 
poor 
Climate in Mae Nam Beach

Is your destination not in the list? Have a look at other destinations in Koh Samui, in Thailand.

Is September the best time to visit Koh Samui?

Given the typically tolerable weather conditions in Chaweng Beach, September might be a good time to visit Koh Samui.

Generally speaking, the best visiting conditions can be found in January and February offering mostly perfect weather in Chaweng Beach. On the other hand, the weather in October and November tend to be poor.

Interested in more climate information?

We have much more information about the climate in Koh Samui. Interested in the weather conditions in a specific month? Select the month below.

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  • Weather and climate has detailed information for every country in the world. Are you going to Thailand? Get detailed historical weather averages for many cities in Thailand.

    Not sure yet where to go? We now have a tool which recommends destinations that suit your ideal climate conditions. Find out where to go with our weather planner.