Very hot in Jun
34°C average high
avg high · 19° at night
25°C+ on almost every day · often 35°C+
Thailand
Koh Samui weather in June
Is it warm? Yes. June in Koh Samui is hot: afternoons average 33°C and nights 26°C. Most days (80%) peak between 32°C and 34°C.
Hot · average high
33°C
25°C or more on almost every day.
- Average low26°overnight
- Sea30°average, 2022–2025
- Rainy days895 mm in the month
- SkyMostly cloudy87% cloud · 1% clear days
How warm it really gets
Every June afternoon from 2011–2025: 450 days. Most (80%) peaked between 32° and 34°.
June, year by year
The average June high in each year. The warmest, 2024, averaged 34°C; the coolest, 2013, 32°C.
Compared with home
Average June highs. Expect rain on about 8 days (95 mm in a typical month).
- Koh Samui33°
- London22°
- Manchester19°
- Glasgow19°
- Dublin18°
- Cork18°
- Belfast18°
Warmer in June, not much further
Flying times are estimates from Dublin; Koh Samui is about 13h.
Very hot in Jun
40°C average high
avg high · 26° at night
25°C+ on almost every day · often 35°C+
Very hot in Jun
38°C average high
avg high · 28° at night
25°C+ on almost every day · often 35°C+
Air: Copernicus ERA5-Land, 2011–2025, matched to the official averages for Koh Samui. Sea: Copernicus ERA5, 2022–2025. Rainy days = days with 1 mm of rain or more, as weather stations count them. Clear day = average cloud cover of 30% or less. These are averages of past weather, not a forecast. Methodology