Very hot in Apr
35°C average high
avg high · 18° at night
25°C+ on almost every day · often 35°C+
Thailand
Koh Samui weather in April
Is it warm? Yes. April in Koh Samui is hot: afternoons average 32°C and nights 26°C. Most days (80%) peak between 30°C and 33°C.
Hot · average high
32°C
25°C or more on almost every day.
- Average low26°overnight
- Sea30°average, 2022–2025
- Rainy days7150 mm in the month
- SkyOften cloudy63% cloud · 16% clear days
How warm it really gets
Every April afternoon from 2011–2025: 450 days. Most (80%) peaked between 30° and 33°.
April, year by year
The average April high in each year. The warmest, 2024, averaged 34°C; the coolest, 2011, 31°C.
Compared with home
Average April highs. Expect rain on about 7 days (150 mm in a typical month).
- Koh Samui32°
- London15°
- Glasgow13°
- Cork13°
- Manchester13°
- Dublin13°
- Belfast13°
Warmer in April, not much further
Flying times are estimates from Dublin; Koh Samui is about 13h.
Very hot in Apr
34°C average high
avg high · 21° at night
25°C+ on almost every day · often 35°C+
Very hot in Apr
36°C average high
avg high · 22° 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