How warm is it in Koh Samui in March?

Daytime highs averaged 29.0 °C, night-time lows 27.4 °C. The highest value of the past 10 years was 31.1 °C (31 Mar 2021), the lowest 26.1 °C (11 Mar 2017).

How often does it rain in Koh Samui in March?

On average there were 7.8 rain days (at least 1 mm) with 53.5 mm of precipitation in total. In 1 of 10 years there was no rain day at all.

🇹🇭 Weather in Koh Samui in March

This is what the weather in Koh Samui (Thailand) was like in March in 2017–2026.

Key facts at a glance

Prevailing weather: Partly cloudy

Avg. daytime high

29.0 °C

28.4 °C – 29.7 °C

Avg. night-time low

27.4 °C

26.8 °C – 28.0 °C

Avg. rain days in period

7.8

25 % of days · ≥ 1.0 mm

Avg. precipitation in period

53.5 mm

1.3 mm – 148 mm

Avg. cloud cover

51 %

This data source has no sunshine hours – average cloud cover shown instead.

Avg. sea temperature

–

Sea temperature unavailable for today (daily limit).

Extremes: Highest temperature 31.1 °C (31 Mar 2021) · Lowest temperature 26.1 °C (11 Mar 2017) · Avg. daily peak wind 16 km/h

Weather mix of all days

79Sunny
109Partly cloudy
44Cloudy
51Light rain
27Rain

Summary

On average 29.0 °C during the day and 27.4 °C at night.
On average 7.8 rain days (Rain day = at least 1.0 mm of precipitation) with 53.5 mm of precipitation in total.
In 1 of 10 years there was not a single rain day.
Prevailing: Partly cloudy.
Warmest year: 2024 (avg. 29.7 °C), coolest: 2023 (avg. 28.4 °C).
Wettest year: 2022 (148 mm), driest: 2020 (1.3 mm).
Extremes: 31.1 °C on 31 Mar 2021 and 26.1 °C on 11 Mar 2017.

Overall values from all 10 years. How is this calculated?

Temperatures per year

Average over your travel period

Precipitation & rain days

Year by year

2026
Avg. max28.6°Avg. min27.0°
Rain days
13 Rain days
Precipitation
61.5 mm
Avg. cloud cover
41 % cloudy
Sea temperature
–
Max 30.3 °C · Min 26.4 °C
2025
Avg. max28.9°Avg. min27.4°
Rain days
9 Rain days
Precipitation
40.3 mm
Avg. cloud cover
55 % cloudy
Sea temperature
–
Max 30.2 °C · Min 26.5 °C
2024
Avg. max29.7°Avg. min28.0°
Rain days
1 Rain days
Precipitation
5.8 mm
Avg. cloud cover
51 % cloudy
Sea temperature
–
Max 30.4 °C · Min 27.5 °C
2023
Avg. max28.4°Avg. min26.8°
Rain days
4 Rain days
Precipitation
46.1 mm
Avg. cloud cover
50 % cloudy
Sea temperature
–
Max 30.2 °C · Min 26.1 °C
2022
Avg. max28.8°Avg. min27.6°
Rain days
17 Rain days
Precipitation
148 mm
Avg. cloud cover
62 % cloudy
Sea temperature
–
Max 30.2 °C · Min 26.3 °C
2021
Avg. max28.7°Avg. min27.2°
Rain days
9 Rain days
Precipitation
54.8 mm
Avg. cloud cover
55 % cloudy
Sea temperature
–
Max 31.1 °C · Min 26.6 °C
2020
Avg. max29.6°Avg. min27.4°
Rain days
0 Rain days
Precipitation
1.3 mm
Avg. cloud cover
42 % cloudy
Sea temperature
–
Max 31.1 °C · Min 26.3 °C
2019
Avg. max29.3°Avg. min27.6°
Rain days
3 Rain days
Precipitation
23.3 mm
Avg. cloud cover
41 % cloudy
Sea temperature
–
Max 31.1 °C · Min 26.1 °C
2018
Avg. max28.8°Avg. min27.3°
Rain days
11 Rain days
Precipitation
68.3 mm
Avg. cloud cover
52 % cloudy
Sea temperature
–
Max 30.1 °C · Min 26.8 °C
2017
Avg. max28.7°Avg. min27.3°
Rain days
11 Rain days
Precipitation
85.5 mm
Avg. cloud cover
62 % cloudy
Sea temperature
–
Max 30.0 °C · Min 26.1 °C

Frequently asked questions

How warm is it in Koh Samui in March?: Daytime highs averaged 29.0 °C, night-time lows 27.4 °C. The highest value of the past 10 years was 31.1 °C (31 Mar 2021), the lowest 26.1 °C (11 Mar 2017).
How often does it rain in Koh Samui in March?: On average there were 7.8 rain days (at least 1 mm) with 53.5 mm of precipitation in total. In 1 of 10 years there was no rain day at all.

Check your exact travel dates

Choose your travel period – we show the weather for exactly those days.

Data sources

Weather data: Data obtained from the NASA Langley Research Center (LaRC) POWER Project funded through the NASA Earth Science/Applied Science Program
Reanalysis (weather model constrained by observations) on a coarse grid of about 50 km. Values represent a large area and can differ from local conditions, especially on islands, coasts and in mountains. No sunshine duration.
Reanalysis (weather model constrained by observations)
Reanalysis values represent a grid cell (approx. 25–50 km) and may differ from local measurements on coasts, islands and in mountains.
Sea temperature: MUR SST data were provided by JPL under support by NASA MEaSUREs program; accessed via NOAA CoastWatch ERDDAP
Daily multi-scale ultra-high resolution (≈ 1 km) analysis of satellite measurements (infrared, microwave) and in-situ data. Represents the foundation temperature below the daily warm surface layer. (Satellite and in-situ analysis)
Place search: Natural Earth (public domain) · GeoNames (CC BY 4.0) / OpenStreetMap (ODbL)