Koh Samui weather in June
Temperature, sea and sunshine in June: long-term averages from 30 years of weather data, not a forecast.
Holiday weather in June
Good
Best time to visit: January – April
What is the weather like in Koh Samui in June?
In June, Koh Samui is hot: daytime highs average 30 °C, and even at night it stays warm at around 27 °C. The sea averages 30.0 °C – almost as warm as a bath. The sun shines for around 7 hours a day. It is the rainy season: rain falls on about 21 days, totalling 112 mm. On about 14 days the thermometer climbs to 30 °C or more. The air is often humid and muggy. All in all, June is a good month for a holiday in Koh Samui.
June compared
How the weather changes from May to July. Tap a month to open it.
More details for June
- Daylight
- 12 h 41 min06:00 – 18:41
- UV index
- 13 · extremeclear sky, noon (estimate)
- Muggy days
- 30 daysdew point 18 °C or more
- Wind
- 15 km/haverage daily peak
- Cloud cover
- 86 %on average
- Hot days
- 14 days30 °C or more
- Time zone
- UTC+7Asia/Bangkok
How the score comes together
- Temperatureweight 35 %100 %
- Seaweight 25 %100 %
- Sunshineweight 20 %63 %
- Few rainy daysweight 20 %0 %
Each factor is rated from 0 to 100 % and weighted for the travel style “Sun, sea & sand”.
What to pack in June
- Swimwear
- Sunscreen
- Sunglasses & sun hat
- Light, breathable clothes
- Water bottle – drink plenty
- Insect repellent
- Rain jacket or umbrella
Koh Samui in June: quick answers
Is Koh Samui hot in June?
Yes. In June, Koh Samui is hot: daytime highs average 30 °C and nights stay around 27 °C. On about 14 days the thermometer climbs to 30 °C or more.
Can you swim in Koh Samui in June?
Yes. In June the sea averages 30.0 °C – almost as warm as a bath.
Does it rain much in Koh Samui in June?
It rains often – on about 21 days, adding up to 112 mm.
Koh Samui month by month
The whole year in Koh SamuiAll destinations: Thailand
Climate averages 1996–2025, not a forecast. Data: Copernicus ERA5 / ERA5-Land via Open-Meteo.com (CC BY 4.0), NOAA OISST, GeoNames (CC BY 4.0)