How warm is it in Koh Samui in October?

Daytime highs averaged 28.7 °C, night-time lows 27.4 °C. The highest value of the past 10 years was 30.2 °C (10 Oct 2021), the lowest 26.1 °C (20 Oct 2018).

How often does it rain in Koh Samui in October?

On average there were 28.5 rain days (at least 1 mm) with 261 mm of precipitation in total.

🇹🇭 Weather in Koh Samui in October

This is what the weather in Koh Samui (Thailand) was like in October in 2016–2025.

Key facts at a glance

Prevailing weather: Rain

Avg. daytime high

28.7 °C

28.0 °C – 29.3 °C

Avg. night-time low

27.4 °C

26.7 °C – 28.1 °C

Avg. rain days in period

28.5

92 % of days · ≥ 1.0 mm

Avg. precipitation in period

261 mm

121 mm – 392 mm

Avg. cloud cover

92 %

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 30.2 °C (10 Oct 2021) · Lowest temperature 26.1 °C (20 Oct 2018) · Avg. daily peak wind 18 km/h

Weather mix of all days

4Partly cloudy
21Cloudy
112Light rain
173Rain

Summary

On average 28.7 °C during the day and 27.4 °C at night.
On average 28.5 rain days (Rain day = at least 1.0 mm of precipitation) with 261 mm of precipitation in total.
Prevailing: Rain.
Warmest year: 2024 (avg. 29.3 °C), coolest: 2022 (avg. 28.0 °C).
Wettest year: 2022 (392 mm), driest: 2017 (121 mm).
Extremes: 30.2 °C on 10 Oct 2021 and 26.1 °C on 20 Oct 2018.

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

Temperatures per year

Average over your travel period

Precipitation & rain days

Year by year

2025
Avg. max28.5°Avg. min27.3°
Rain days
30 Rain days
Precipitation
304 mm
Avg. cloud cover
92 % cloudy
Sea temperature
–
Max 29.5 °C · Min 26.5 °C
2024
Avg. max29.3°Avg. min28.1°
Rain days
28 Rain days
Precipitation
225 mm
Avg. cloud cover
92 % cloudy
Sea temperature
–
Max 29.8 °C · Min 27.5 °C
2023
Avg. max29.0°Avg. min27.9°
Rain days
30 Rain days
Precipitation
299 mm
Avg. cloud cover
84 % cloudy
Sea temperature
–
Max 29.8 °C · Min 27.3 °C
2022
Avg. max28.0°Avg. min27.0°
Rain days
31 Rain days
Precipitation
392 mm
Avg. cloud cover
97 % cloudy
Sea temperature
–
Max 29.2 °C · Min 26.1 °C
2021
Avg. max28.8°Avg. min27.5°
Rain days
29 Rain days
Precipitation
209 mm
Avg. cloud cover
91 % cloudy
Sea temperature
–
Max 30.2 °C · Min 26.6 °C
2020
Avg. max28.4°Avg. min27.0°
Rain days
31 Rain days
Precipitation
361 mm
Avg. cloud cover
95 % cloudy
Sea temperature
–
Max 29.5 °C · Min 26.4 °C
2019
Avg. max29.0°Avg. min27.9°
Rain days
27 Rain days
Precipitation
224 mm
Avg. cloud cover
88 % cloudy
Sea temperature
–
Max 30.0 °C · Min 27.1 °C
2018
Avg. max28.6°Avg. min27.5°
Rain days
29 Rain days
Precipitation
251 mm
Avg. cloud cover
89 % cloudy
Sea temperature
–
Max 29.6 °C · Min 26.1 °C
2017
Avg. max28.9°Avg. min27.6°
Rain days
22 Rain days
Precipitation
121 mm
Avg. cloud cover
92 % cloudy
Sea temperature
–
Max 29.8 °C · Min 26.4 °C
2016
Avg. max28.4°Avg. min26.7°
Rain days
28 Rain days
Precipitation
229 mm
Avg. cloud cover
96 % cloudy
Sea temperature
–
Max 29.5 °C · Min 26.2 °C

Frequently asked questions

How warm is it in Koh Samui in October?: Daytime highs averaged 28.7 °C, night-time lows 27.4 °C. The highest value of the past 10 years was 30.2 °C (10 Oct 2021), the lowest 26.1 °C (20 Oct 2018).
How often does it rain in Koh Samui in October?: On average there were 28.5 rain days (at least 1 mm) with 261 mm of precipitation in total.

Check your exact travel dates

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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)