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Ko Samui in June: Weather, Average temperature and Climate

Take a look at past year’s weather for Ko Samui in June and see if it is worth visiting.
Check flight prices to Ko Samui on Avionero:
June

Weather in Ko Samui in June 2025

OK Weather
Warm
🌧️
Rainy
🌊
Very warm water
Ko Samui in June usually sees fair weather conditions, with an average daily high temperature of +82°F and roughly 0 sunny days. However, you should prepare for about 15 rainy days with an average precipitation of 82 mm. The weather is changeable so pack for every eventuality. Search flights in one click on Avionero.
Good to know:
  • June is usually the hottest month of the year in Ko Samui;
  • June is usually the driest month of the year in Ko Samui

Average weather

☀️
+82°F
Avg. max. temperature
+70°F
Min.
+91°F
Max.
82 mm
Total precipitation
77%
Avg. humidity
3 m/s
Avg. wind
0 ☀️
Sunny Days
4 ⛅️
Cloudy
15 🌦
Rainy
Our opinion: Ko Samui has OK weather in June.

Average temperature in Ko Samui in June

Here are the expected maximum, average and minimum temperatures in Ko Samui for June based on the historical data.
Last Year
Historical Data

The temperature in June is +82°F on average, with a range between a maximum of +84°F during the day and a minimum of +75°F at night.

The average maximum temperature goes up 0% by the end of the month, compared with the beginning of the month, from +81°F to +81°F.

Is Ko Samui warm or cold in June?

Ko Samui is typically warm in June.

Maximum temperatures go up compared to the previous month from +82°F to +82°F. The minimum temperature also goes up from +77°F to +77°F.

It’s generally warm, but pack a long-sleeve shirt for evenings.

June is the hottest month in Ko Samui, here is the comparison with other months:

Water temperature in Ko Samui in June

Water in Ko Samui in June is Very warm. It varies from +84°F to +87°F, with an average of +86°F. Note that the air temperature is lower than the water temperature, averaging around +82°F.

In June, water temperatures are average relative to the rest of the year:

The warmest water temperatures in Ko Samui are reached in May, when the average sea temperature rises to +86°F. The coldest water temperatures are in January, with an average of +82°F.

Can you swim in Ko Samui in June?

You can definitely swim in Ko Samui in June, the water is very warm (+86°F in average), and might even be unpleasant for ones who like it more fresh.
🦭
Cold
Below +61°F
🏄‍♂️
Fresh
61°F - 70°F
🏊
Comfortable
70°F - 77°F
👙
Warm
77°F - 82°F
🔥
Very warm
+82°C and up
Don't forget sunscreen and a hat, it's going to be hot!

Climate in Ko Samui in June

Ko Samui weather looks like this, on average, in June and the surrounding months.
MayJuneJuly
Avg. temperature
+82°F+82°F+81°F
Min. temperature
+70°F+70°F+70°F
Max. temperature
+93°F+91°F+91°F
Rainfall
116 mm82 mm82 mm
Wind
2 m/s3 m/s3 m/s
Avg. water temperature
+86°F+86°F+86°F
Humidity
78%77%77%
Air pressure
1008 HPa1007 HPa1008 HPa
Sunny days
000
Cloudy days
243
Rainy days
121517
Snowy days
000

June weather is still as ok as in May. The temperature levels stay the same in the area of +82°F for average maximum temperature during the day. As June arrives, the amount of rainfall goes down. On average, the rainfall volume decreases from 116 mm to 82 mm. It feels drier, as humidity decreases from 78% to 77%. Winds are stronger in comparison to May, going up from 2 m/s to 3 m/s on average. The amount of sunny days stay about the same, averaging 0 sunny days during the month.

July brings much the same weather, it remains ok.

Wind

Wind speed in Ko Samui in June based on historical data.
Last Year
Historical Data

The average wind speed is 3 m/s getting up to 5 m/s which is a light breeze; barely moving the tree leaves.

The average wind speed in Ko Samui is gradually decreasing during June, going from 4 m/s to 3 m/s over the course of the month.

Rain

Amount of rainfall in mm during June in Ko Samui based on historical data.
Last Year
Historical Data
A chance of rain on a typical day in June stands at 60%, leading to total precipitation of around 42 mm. The maximum amount of rainfall per day is around 7 mm, which is considered light rain. June is a pretty wet month with over 18 rainy days, so don’t forget to pack an umbrella, raincoat, and a pair of wellies.
Here’s how June is compared with other months in the amount of precipitation, total mm:
Ko Samui wettest month is November, where a typical day has a 57% chance of precipitation and 278 mm of rainfall per day. February, on the other hand, is the driest month with a mere 38% chance of precipitation and 29 mm of rainfall per day.

How was the weather last June in Ko Samui?

This is the weather in Ko Samui in June 2023:
1 June
☁️
+81°F
2 June
🌧️
+82°F
3 June
🌧️
+82°F
4 June
☀️
+83°F
5 June
🌧️
+81°F
6 June
☁️
+80°F
7 June
🌧️
+80°F
8 June
🌧️
+79°F
9 June
☀️
+81°F
10 June
🌧️
+81°F
11 June
☁️
+83°F
12 June
☀️
+82°F
13 June
☀️
+83°F
14 June
☀️
+84°F
15 June
☀️
+82°F
16 June
☀️
+82°F
17 June
🌧️
+81°F
18 June
☁️
+80°F
19 June
☀️
+81°F
20 June
☀️
+83°F
21 June
☀️
+83°F
22 June
☀️
+83°F
23 June
☀️
+83°F
24 June
☀️
+83°F
25 June
☀️
+83°F
26 June
☀️
+83°F
27 June
☀️
+81°F
28 June
🌧️
+82°F
29 June
🌧️
+83°F
30 June
☁️
+81°F
In June 2023 Ko Samui had 16 sunny days, 5 cloudy days, and 9 rainy days. The average maximum temperature was +82°F, with an absolute maximum of +84°F and a minimum of +79°F. The average humidity was 78%, with a maximum of 90% and a minimum of 66%. The average wind speed was 3 m/s, with a maximum of 8 m/s and a minimum of 0 m/s.
Are you planning a trip in June?

Climate Change Over the Years

This is how Ko Samui climate has changed over the last 43 years.

The climate in Ko Samui in June has not changed that much over the last 43 years.

The average temperature was the lowest in 1986 (+79°F) and the highest in 2012 (+83°F). The driest year was 1997 with only 927 mm of rainfall, and the wettest year was 1999 with 1981 mm.

FAQ

Frequently asked questions about the weather in Ko Samui in June:

Is June a good time to visit Ko Samui?

It’s always a good time to visit Ko Samui, but the weather is changeable in June, so plan a mix of indoor and outdoor activities and exploring, and pack for every eventuality.

Can you sunbathe in Ko Samui in June?

June is warm in Ko Samui. You may enjoy some beach or pool time in the day, but pack something a tad warmer for the evening.

Can you swim in Ko Samui in June?

Yes, you can swim in Ko Samui in June, the water is very warm, with temperature averaging at +86°F, but it's important to manage hydration and sun exposure.

Is Ko Samui rainy in June?

Ko Samui is often rainy in June. You may get a bit damp when outside, so pack an umbrella, and maybe even a raincoat.

Is it sunny in Ko Samui in June?

Usually, it’s not very sunny in Ko Samui in June, often it’s pretty cloudy. Pack for any eventuality; layering can help reduce the number of bulky items needed.

Other cities in Thailand

Check out the weather for other cities in Thailand.

Monthly weather in Ko Samui

Source of the data

For this page, we’ve looked at the typical weather in Ko Samui, based on historical hourly weather data from January 1, 1979, to December 31, 2023.

For past dates, we show actual recorded data at the location at that time. Forecasts are based on recorded weather during that day of the year, averaged over the total years for which we have records (unless stated otherwise). The daily temperature is the highest recorded temperature in the shadow during that day.