Koh Samui, Thailand

Koh Samui, Thailand

March beach and weather guide

Based on 5 years of historical ERA5 climate data

Photo by Pauline Bernfeld on Unsplash

Checking 5 years of weather data...

This can take a few seconds

← All beach destinations · Search your dates

March beach conditions — historical average

Excellent
Find hotels in Koh Samui 🏨 Find flights to Koh Samui ✈️
27.4°C Temp
29.8°C Sea temp
5.8 Rain days
10.9h Sunshine hrs
76.3% Humidity

Year by year — mid March

2025 Good 26.9°C · 11 rainy days · 11.0h sun
2024 Excellent 28.9°C · 3 rainy days · 11.1h sun
2023 Excellent 26.3°C · 5 rainy days · 11.1h sun
2022 Excellent 27.1°C · 6 rainy days · 10.0h sun
2021 Excellent 27.6°C · 4 rainy days · 11.1h sun

Other months in Koh Samui

January February March July August September

Compare with other destinations

Not sure where to book? Add up to two more destinations below and compare Koh Samui side by side for your exact dates.

Trip type

Each trip type is scored on what matters most for it — snow days for skiing, sea temp for beach, sunshine for sightseeing.

Dates
Destinations

About Koh Samui in March

Based on 5 years of ERA5 historical climate data, March in Koh Samui has historically been excellent for a beach holiday. Average temperatures of 27.4°C with sea temperatures around 29.8°C and 5.8 rainy days on average.

0 of the last 5 years had good beach conditions during this period. This data uses ERA5 reanalysis records — real historical measurements, not generalised averages.

Check your specific dates

See 5 years of data for your exact travel dates

Check conditions for your exact dates →