The Koh Samui Port Authority issues a clear warning to mariners and pleasure boaters: maximum vigilance is required for all navigation between 6 and 12 May 2026 due to scattered thunderstorms and a marked strengthening of winds and waves.
In an official press release issued this Thursday, the Koh Samui Regional Port Authority calls for the utmost caution from all sea users.
The authorities expressly recommend redoubling vigilance during this period, with thunderstorms expected in scattered areas across the Koh Samui region.
Navigators must be particularly wary of the strengthening of winds and waves which could make crossings more difficult and potentially dangerous.
These recommendations are based on updated meteorological data provided by the Koh Samui Regional Port Authority.
Day-by-day forecasts from 8 to 11 May (based on AccuWeather; check AccuWeather or TMD.go.th for updates) :
| Date | Conditions | Temperatures | Chance of Rain |
|---|---|---|---|
| 8 May | Cloudy with scattered thunderstorms and strengthened winds 🌧️🌊 | 🌡️ 31°C / 27°C | 🌧️ High (75%) |
| 9 May | Possible thunderstorms and choppy seas 🌧️🌊 | 🌡️ 31°C / 27°C | 🌧️ Very High (80%) |
| 10 May | Scattered thundery showers and strong waves 🌧️🌊 | 🌡️ 30°C / 27°C | 🌧️ High (70%) |
| 11 May | Evening thunderstorms and sustained winds 🌧️🌊 | 🌡️ 31°C / 27°C | 🌧️ High (65%) |
For precise and up-to-date forecasts, consult TMD.go.th directly.
Sources: Municipality / AccuWeather – data as of 7 May 2026