Koh Samui Weather and Boat Trips: A Month-by-Month Guide
Weather is the biggest thing you can't control on a boat trip. This guide helps you plan around it.
The broad pattern
Koh Samui is warm all year, with air temperatures typically around 27 to 32°C and warm seas. Many guides list December to February as peak season and February as one of the driest months. March to June is hotter, and July to September is often reliable too, with showers that tend to be brief.
The wetter months
October and November are commonly the wettest, with strong winds and rough seas that can lead to cancelled trips. Sources disagree on exact month boundaries, which is normal because Samui sits between weather systems.
How this affects boat trips
A boat trip is safe only when the sea allows it. We decide with the crew on the day, and we confirm the time closer to your date. If conditions are poor we will tell you honestly and offer a safer day.
Tips for planning
Book a flexible day, not your last day on the island. Keep a spare day in your itinerary. Message us on WhatsApp for the current sea conditions before you decide.
Quick answers
What is the rainy season in Koh Samui?
It is commonly October and November, though showers can occur at other times.
Are boat trips cancelled in bad weather?
Yes, when the sea is unsafe. We will tell you and arrange a better day.
Planning your trip?
Message us with your dates and group size and we will confirm the sea conditions, times and price.
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