Koh Samui, Thailand

Koh Samui, Thailand

January beach and weather guide

Based on 5 years of historical ERA5 climate data

Photo by Pauline Bernfeld on Unsplash

Checking 5 years of weather data...

This can take a few seconds

← All beach destinations · Search your dates

January beach conditions — historical average

Good
Find hotels in Koh Samui 🏨 Find flights to Koh Samui ✈️
📈 Our data shows more favourable conditions in 2024-2025 compared to 2021-2022 for this destination and time of year
25.6°C Temp
28.7°C Sea temp
6.4 Rain days
10.7h Sunshine hrs
77.0% Humidity

Year by year — mid January

2025 Good 25.5°C · 5 rainy days · 10.7h sun
2024 Excellent 27.1°C · 7 rainy days · 10.9h sun
2023 Excellent 25.8°C · 4 rainy days · 10.4h sun
2022 Good 25.5°C · 6 rainy days · 11.0h sun
2021 Good 24.3°C · 10 rainy days · 10.5h sun

Other months in Koh Samui

January February March July August September

Compare with other destinations

Not sure where to book? Add up to two more destinations below and compare Koh Samui side by side for your exact dates.

Trip type

Each trip type is scored on what matters most for it — snow days for skiing, sea temp for beach, sunshine for sightseeing.

Dates
Destinations

About Koh Samui in January

Based on 5 years of ERA5 historical climate data, January in Koh Samui has historically been good for a beach holiday. Average temperatures of 25.6°C with sea temperatures around 28.7°C and 6.4 rainy days on average.

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

Check your specific dates

See 5 years of data for your exact travel dates

Check conditions for your exact dates →