🇹🇭 Weather in Koh Samui in January
This is what the weather in Koh Samui (Thailand) was like in January in 2017–2026.
Key facts at a glance
Avg. daytime high
27.6 °C
27.2 °C – 28.4 °C
Avg. night-time low
26.3 °C
25.7 °C – 27.2 °C
Avg. rain days in period
13.8
45 % of days · ≥ 1.0 mm
Avg. precipitation in period
151 mm
13.4 mm – 707 mm
Avg. cloud cover
72 %
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 29.2 °C (7 Jan 2024) · Lowest temperature 24.7 °C (12 Jan 2021) · Avg. daily peak wind 21 km/h
Weather mix of all days
- 19Sunny
- 82Partly cloudy
- 71Cloudy
- 82Light rain
- 56Rain
Summary
- On average 27.6 °C during the day and 26.3 °C at night.
- On average 13.8 rain days (Rain day = at least 1.0 mm of precipitation) with 151 mm of precipitation in total.
- Prevailing: Light rain.
- Warmest year: 2024 (avg. 28.4 °C), coolest: 2026 (avg. 27.2 °C).
- Wettest year: 2017 (707 mm), driest: 2020 (13.4 mm).
- Extremes: 29.2 °C on 7 Jan 2024 and 24.7 °C on 12 Jan 2021.
Overall values from all 10 years. How is this calculated?
Charts
Temperatures per year
Average over your travel period
Precipitation & rain days
Year by year
2026
Avg. max27.2°Avg. min25.7°- Rain days
- 11 Rain days
- Precipitation
- 37.5 mm
- Avg. cloud cover
- 64 % cloudy
- Sea temperature
- –
Max 28.1 °C · Min 24.8 °C
2025
Avg. max27.5°Avg. min26.1°- Rain days
- 10 Rain days
- Precipitation
- 95.4 mm
- Avg. cloud cover
- 73 % cloudy
- Sea temperature
- –
Max 28.2 °C · Min 25.0 °C
2024
Avg. max28.4°Avg. min27.2°- Rain days
- 19 Rain days
- Precipitation
- 108 mm
- Avg. cloud cover
- 74 % cloudy
- Sea temperature
- –
Max 29.2 °C · Min 26.8 °C
2023
Avg. max27.5°Avg. min26.1°- Rain days
- 15 Rain days
- Precipitation
- 120 mm
- Avg. cloud cover
- 86 % cloudy
- Sea temperature
- –
Max 28.3 °C · Min 25.1 °C
2022
Avg. max27.8°Avg. min26.5°- Rain days
- 7 Rain days
- Precipitation
- 24.5 mm
- Avg. cloud cover
- 52 % cloudy
- Sea temperature
- –
Max 28.9 °C · Min 25.6 °C
2021
Avg. max27.3°Avg. min25.9°- Rain days
- 14 Rain days
- Precipitation
- 51.5 mm
- Avg. cloud cover
- 78 % cloudy
- Sea temperature
- –
Max 28.0 °C · Min 24.7 °C
2020
Avg. max27.9°Avg. min26.6°- Rain days
- 3 Rain days
- Precipitation
- 13.4 mm
- Avg. cloud cover
- 50 % cloudy
- Sea temperature
- –
Max 28.6 °C · Min 26.1 °C
2019
Avg. max27.9°Avg. min26.6°- Rain days
- 15 Rain days
- Precipitation
- 180 mm
- Avg. cloud cover
- 70 % cloudy
- Sea temperature
- –
Max 28.8 °C · Min 25.6 °C
2018
Avg. max27.4°Avg. min26.2°- Rain days
- 18 Rain days
- Precipitation
- 173 mm
- Avg. cloud cover
- 85 % cloudy
- Sea temperature
- –
Max 28.3 °C · Min 25.1 °C
2017
Avg. max27.5°Avg. min26.5°- Rain days
- 26 Rain days
- Precipitation
- 707 mm
- Avg. cloud cover
- 89 % cloudy
- Sea temperature
- –
Max 28.1 °C · Min 25.9 °C
Frequently asked questions
- How warm is it in Koh Samui in January?
- Daytime highs averaged 27.6 °C, night-time lows 26.3 °C. The highest value of the past 10 years was 29.2 °C (7 Jan 2024), the lowest 24.7 °C (12 Jan 2021).
- How often does it rain in Koh Samui in January?
- On average there were 13.8 rain days (at least 1 mm) with 151 mm of precipitation in total.
Check your exact travel dates
Choose your travel period – we show the weather for exactly those days.
Other destinations in January
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)