Mariners in the Gulf of Thailand, be aware! From February 3-9, 2026, the northeast monsoon brings moderate to strong winds and waves up to 2 meters, especially during thunderstorms.

Small boats (under 9m) should stay ashore, and all vessels should check equipment and forecasts. Stay safe!

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Overview of Weather Conditions

The Koh Samui Regional Marine Office has issued a cautionary announcement for marine navigation in the Gulf of Thailand due to changing weather conditions influenced by the northeast monsoon. The notice covers the period from February 3 to February 9, 2026, highlighting fluctuating wind strengths and wave heights that may impact marine travel and safety.

Detailed Weather Forecast and Wave Conditions

• February 3-4, 2026:
• Moderate winds are expected to prevail in the Gulf of Thailand.
• Wave heights in the lower Gulf are forecasted to reach approximately 2 meters.

• In areas experiencing thunderstorms, wave heights may exceed 2 meters due to intensified weather from the moderate-strength northeast monsoon.

• February 5-7, 2026:

• Winds and wave activity are anticipated to weaken as the northeast monsoon subsides.
• Lower Gulf wave heights are predicted to decrease, ranging between 1-2 meters.

• Thunderstorms may still cause localized increases in wave heights above 2 meters.

• February 6-9, 2026:

• Winds and waves are expected to return to moderate levels.
• Wave heights in the lower Gulf will be around 2 meters, with thunderstorms potentially producing higher waves.

Recommendations for Mariners

Precautionary Measures

• Mariners are strongly advised to exercise heightened caution throughout the advisory period, particularly in locations where thunderstorms are present.
• Avoid navigating in areas where severe weather or thunderstorms are forecasted.

Departure Guidelines Based on Vessel Size

• Boats less than 9 meters in length:
• Recommended not to leave the shore or to avoid sailing during the advisory period.
• Boats longer than 9 meters:
• Should proceed with caution, maintaining vigilant awareness of changing sea conditions and weather updates.

Essential Safety Protocols

• Prior to departure, ensure that the vessel's engine and all communication equipment are thoroughly checked and in optimal working condition.
• Always consult the latest weather forecasts before setting out to sea.
• Be familiar with emergency procedures and keep all necessary safety gear readily accessible.

Emergency Contacts and Further Information

In case of emergencies or for real-time updates and assistance, mariners can use the following contacts:
- Hotline: 1199 (available 24 hours)
- Koh Samui Regional Marine Office: 077-426157

Additional Safety Information for Gulf of Thailand Waters

The Gulf of Thailand is periodically affected by monsoon systems, which can cause rapid changes in sea and weather conditions. Mariners, tourists, and commercial operators are encouraged to stay updated on official announcements and weather bulletins, particularly during monsoon or transitional weather periods. Following official marine advisories helps ensure the safety of passengers, crew, and vessels operating in the region.

Frequently Asked Questions

Frequently Asked Questions (FAQ)

What weather conditions should mariners expect in the Gulf of Thailand from February 3-9, 2026?

Mariners should anticipate moderate to strong northeast monsoon winds and wave heights up to 2 meters, particularly during thunderstorms. Conditions may fluctuate, with periods of slightly calmer seas, but caution is advised throughout due to potential rapid weather changes.

Are small boats allowed to operate during the advisory period?

No, boats under 9 meters in length are strongly advised to stay ashore and avoid sailing during this period due to heightened risks from strong winds and high waves.

What safety measures should all mariners take before departing?

All mariners should thoroughly inspect their vessel's engine and communication systems, stay updated with the latest weather forecasts, be familiar with emergency procedures, and keep all required safety gear accessible. In case of emergencies, contact the 24-hour hotline 1199 or the Koh Samui Regional Marine Office at 077-426157.