Koh Samui weather
Loading live data…EuropeanECMWF
28°
Overcast
Feels 29° · Wind 19 km/h · Humidity 64%
AmericanNOAA GFS
27°
Overcast
Feels 27° · Wind 32 km/h · Humidity 74%
GermanDWD ICON
27°
Overcast
Feels 30° · Wind 12 km/h · Humidity 75%
Latest for Koh Samui: European (ECMWF): 28° Overcast · American (NOAA GFS): 27° Overcast · German (DWD ICON): 27° Overcast.
The weather map: all three models at once
European, American, German side by side around Koh Samui and nearby towns.Live rain radar →Loading the three model maps…
Next 14 hours
consensus of the three models7-day forecast
where the models agree, and where they splitHeading to Koh Samui? Koh Samui, Thailand, sits at 9.5°N in a tropical climate zone. It sits in the tropics, so it stays warm all year — the question on any trip is the wet season versus the dry season, not hot versus cold. Before you lock in outdoor plans, compare how the three global models — European (ECMWF), American (GFS) and German (ICON) — forecast Koh Samui right now. Where they agree you can trust it; the days they split are exactly when a single weather app is least reliable. For a beach trip the rain and wind columns below matter most — that is what makes or breaks a day by the sea.
Common questions
When is the best time to visit Koh Samui?
Koh Samui is warm year-round. Most travellers aim for the drier months for the most reliable sunshine — use the live comparison above to check the exact days of your trip.
Will it rain in Koh Samui during my trip?
Rain is where forecasts disagree most. Instead of trusting one app, the comparison above lines up the European, American and German models for Koh Samui — check your dates and look for the days they agree; those are the ones you can plan around.
Which forecast is most accurate for Koh Samui?
For destinations abroad we compare the three global models (ECMWF, GFS and ICON) that nearly every weather app quietly builds on. No single app tells you when they disagree — we do, so you can judge the confidence yourself.