Koh Samui, Thailand
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Koh Samui

March beach and weather guide

Based on 5 years of historical ERA5 climate data

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March beach conditions — historical average

Excellent
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27.4°C Temp
29.8°C Sea temp
5.8 Rain days
10.9h Sunshine hrs
76.3% Humidity
100%

Reliable conditions

5 of 5 years were good

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

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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.

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

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