Hot in Mar
33°C average high
avg high · 20° at night
25°C+ on almost every day
Thailand
Koh Samui weather in March
Is it warm? Yes. March in Koh Samui is hot: afternoons average 31°C and nights 26°C. Most days (80%) peak between 29°C and 32°C.
Hot · average high
31°C
25°C or more on almost every day.
- Average low26°overnight
- Sea29°average, 2022–2025
- Rainy days4118 mm in the month
- SkyOften cloudy50% cloud · 31% clear days
How warm it really gets
Every March afternoon from 2011–2025: 465 days. Most (80%) peaked between 29° and 32°.
March, year by year
The average March high in each year. The warmest, 2024, averaged 32°C; the coolest, 2011, 29°C.
Compared with home
Average March highs. Expect rain on about 4 days (118 mm in a typical month).
- Koh Samui31°
- London12°
- Cork11°
- Dublin11°
- Glasgow10°
- Belfast10°
- Manchester10°
Warmer in March, not much further
Flying times are estimates from Dublin; Koh Samui is about 13h.
Very hot in Mar
33°C average high
avg high · 25° at night
25°C+ on almost every day
Hot in Mar
32°C average high
avg high · 22° at night
25°C+ on almost every day
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