The weather in August in Koh Samui

It's hot in August in Koh Samui with an average temperature of 33°C. Temperatures this month range from a low of 32°C to a high of 34°C. At night, you can expect temperatures between 26°C and 27°C.

Looking for sun? August isn’t a good month to be in Koh Samui. The temperature is nice, but there’s too much chance of rain.

Average temperatures and precipitation

This chart shows the average daily maximum and minimum temperatures (in degrees Celsius) and precipitation (in millimeters) in August for Koh Samui, Thailand. A low precipitation value usually indicates little to no rainfall on that day in recent years, while a higher value suggests more frequent rainfall.

Temperature records

With 36°C in 2023, Koh Samui reached the highest temperature in August over the past 10 years. The lowest daytime temperature in this month was 28°C in 2015. The extreme nighttime temperatures ranged from a lowest recorded value of 23°C to a highest value of 29°C.

Rainfall amount

In August, there is an average of 112 mm of precipitation, spread over 14 days. The wind speed is around 4 Bft, mostly coming from the West.

Daily weather in August for Koh Samui

Click on any day in August to get detailed info about the usual weather on that day in Koh Samui. Check out the historical temperatures and precipitation over the past 10 years on this day.

1

33° / 27°

2

33° / 27°

3

33° / 27°

4

33° / 27°

5

33° / 27°

6

33° / 27°

7

32° / 27°

8

33° / 27°

9

33° / 27°

10

33° / 27°

11

33° / 27°

12

34° / 27°

13

34° / 27°

14

34° / 27°

15

33° / 27°

16

33° / 27°

17

34° / 27°

18

34° / 27°

19

34° / 27°

20

33° / 27°

21

34° / 27°

22

33° / 27°

23

34° / 27°

24

34° / 27°

25

34° / 27°

26

33° / 27°

27

33° / 27°

28

33° / 27°

29

34° / 26°

30

33° / 26°

31

34° / 27°

Start of August

The month of August starts in Koh Samui with hot temps, averaging around 33°C during the day and nights around 27°C.

Mid August

By mid-August, daytime temps rise to around 34°C, with nights around 27°C. During this part of the month, you might see regular precipitation, but there will also be some sunny days.

End of August

By the end of August, the average daytime temperature in Koh Samui is around 34°C, while nighttime temps are about 27°C. Expect regular precipitation, but if you’re lucky, you’ll also get some dry and sunny days.

Find affordable vacations to Koh Samui

UV index

The UV index is a maximum of 9 this month. That's a very high value on the intensity scale of 1 to 11. Unprotected skin can burn within 10-15 minutes.

The typhoon season in Koh Samui runs from June to November.

Check out the climate of Koh Samui for all months and discover the best travel time

Temperature charts

These charts show the average temperatures in August in Koh Samui, Thailand. The temperatures are shown in degrees Celsius and are calculated based on data from the past 10 years.

Daily Temperature in August in Koh Samui

Temperature in August in Koh Samui over the years

Precipitation charts

These charts show the average amount of precipitation in August in Koh Samui, Thailand. Precipitation is always measured as water, even when it falls as snow or hail The amount of precipitation is displayed in millimeters, while snowfall is shown in centimeters.

Daily Precipitation in August in Koh Samui

Total precipitation in August in Koh Samui over the years

Daily UV index in August in Koh Samui

This chart shows the average daily UV index in August in Koh Samui, with the UV index ranging from 0 to a maximum of 11. The bottom of the chart shows the days of the month. Based on historical data, this chart provides an idea of the daily UV radiation levels you can expect.

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Average weather in Koh Samui by month

Click on a month below to see detailed weather info for Koh Samui. Based on historical weather data, you can see the average temperature, precipitation, wind, and UV index for each day of the month.