How warm is it in Koh Samui in April?

Daytime highs averaged 30.1 °C, night-time lows 28.5 °C. The highest value of the past 10 years was 33.4 °C (28 Apr 2024), the lowest 26.3 °C (2 Apr 2017).

How often does it rain in Koh Samui in April?

On average there were 12.6 rain days (at least 1 mm) with 108 mm of precipitation in total. In 1 of 10 years there was no rain day at all.

🇹🇭 Weather in Koh Samui in April

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

Key facts at a glance

Prevailing weather: Partly cloudy

Avg. daytime high

30.1 °C

29.3 °C – 31.8 °C

Avg. night-time low

28.5 °C

27.9 °C – 29.4 °C

Avg. rain days in period

12.6

42 % of days · ≥ 1.0 mm

Avg. precipitation in period

108 mm

5.8 mm – 268 mm

Avg. cloud cover

64 %

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 33.4 °C (28 Apr 2024) · Lowest temperature 26.3 °C (2 Apr 2017) · Avg. daily peak wind 16 km/h

Weather mix of all days

43Sunny
84Partly cloudy
47Cloudy
64Light rain
62Rain

Summary

On average 30.1 °C during the day and 28.5 °C at night.
On average 12.6 rain days (Rain day = at least 1.0 mm of precipitation) with 108 mm of precipitation in total.
In 1 of 10 years there was not a single rain day.
Prevailing: Partly cloudy.
Warmest year: 2024 (avg. 31.8 °C), coolest: 2017 (avg. 29.3 °C).
Wettest year: 2022 (268 mm), driest: 2026 (5.8 mm).
Extremes: 33.4 °C on 28 Apr 2024 and 26.3 °C on 2 Apr 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. max30.5°Avg. min28.4°
Rain days
0 Rain days
Precipitation
5.8 mm
Avg. cloud cover
41 % cloudy
Sea temperature
–
Max 31.4 °C · Min 27.0 °C
2025
Avg. max29.6°Avg. min28.3°
Rain days
23 Rain days
Precipitation
116 mm
Avg. cloud cover
66 % cloudy
Sea temperature
–
Max 31.1 °C · Min 27.3 °C
2024
Avg. max31.8°Avg. min29.4°
Rain days
2 Rain days
Precipitation
13.8 mm
Avg. cloud cover
48 % cloudy
Sea temperature
–
Max 33.4 °C · Min 28.0 °C
2023
Avg. max30.7°Avg. min28.8°
Rain days
6 Rain days
Precipitation
16.4 mm
Avg. cloud cover
55 % cloudy
Sea temperature
–
Max 31.8 °C · Min 27.4 °C
2022
Avg. max29.5°Avg. min28.4°
Rain days
17 Rain days
Precipitation
268 mm
Avg. cloud cover
68 % cloudy
Sea temperature
–
Max 31.5 °C · Min 27.1 °C
2021
Avg. max29.8°Avg. min28.3°
Rain days
24 Rain days
Precipitation
119 mm
Avg. cloud cover
77 % cloudy
Sea temperature
–
Max 31.0 °C · Min 27.4 °C
2020
Avg. max30.1°Avg. min28.4°
Rain days
14 Rain days
Precipitation
173 mm
Avg. cloud cover
67 % cloudy
Sea temperature
–
Max 31.4 °C · Min 27.5 °C
2019
Avg. max30.7°Avg. min29.1°
Rain days
6 Rain days
Precipitation
30.4 mm
Avg. cloud cover
73 % cloudy
Sea temperature
–
Max 32.1 °C · Min 28.2 °C
2018
Avg. max29.3°Avg. min27.9°
Rain days
13 Rain days
Precipitation
166 mm
Avg. cloud cover
75 % cloudy
Sea temperature
–
Max 31.2 °C · Min 27.3 °C
2017
Avg. max29.3°Avg. min28.0°
Rain days
21 Rain days
Precipitation
169 mm
Avg. cloud cover
68 % cloudy
Sea temperature
–
Max 30.7 °C · Min 26.3 °C

Frequently asked questions

How warm is it in Koh Samui in April?: Daytime highs averaged 30.1 °C, night-time lows 28.5 °C. The highest value of the past 10 years was 33.4 °C (28 Apr 2024), the lowest 26.3 °C (2 Apr 2017).
How often does it rain in Koh Samui in April?: On average there were 12.6 rain days (at least 1 mm) with 108 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)