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VascoPlanet Photography CC BY-SA 4.0 Wikimedia Commons

Ko Wai

Island

Part of Trat's island group, Ko Wai features shallow bays, coral patches and simple guesthouses; visitors use it for snorkeling, day trips from Koh Chang and relaxed beach time.

Ko Wai Map data © OpenStreetMap contributorsTratKo Wai
In this guide

Ko Wai essentials

Address: Ko Wai, Trat/Trat Province area (Gulf of Thailand), Thailand
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About Ko Wai

Ko Wai is a small island in Trat province in the Gulf of Thailand, associated with the Mu Ko Chang archipelago and known for quiet beaches and nearshore snorkeling.

Visitors typically come for short beach stays, snorkeling on nearby reefs and simple island accommodation; boat transfers link Ko Wai with larger neighbouring islands such as Ko Chang and Ko Mak. The island is compact and usually explored on foot or by short walks between beaches and bungalows.

Like many islands in the Trat region, Ko Wai was traditionally used by local fishing communities and later developed modest tourism facilities as boat services between the islands increased.

Ko Wai sits in the northeastern part of the Gulf of Thailand within Trat province and is reached by boat from mainland piers serving the Mu Ko Chang group.

  • Island group and access: Part of the Mu Ko Chang group of islands and commonly visited on day trips from nearby islands such as Ko Chang and Ko Mak.
  • Marine life: Reefs and shallow bays around the island are used for snorkeling and short boat excursions.
Things to Do
When to Go

Best Time to Visit Ko Wai

Ko Wai is a small island in the Trat/Trat Province island chain (near Koh Chang), known for easy snorkeling, white-sand beaches and small resort clusters.

Best sea conditions
November-April · 24-32°C
Clear water and calm seas for snorkeling.
Shoulder/quiet months
May & October · 24-31°C
Fewer visitors; occasional showers.

Weather & Climate near Ko Wai

Climate

Tropical climate with consistently warm temperatures year-round. Temperatures range from 23°C to 34°C. Heavy rainfall (3602 mm/year), wettest in August with a pronounced dry season.

Air Quality: AQI 61 Moderate
Best Time to Visit
DecemberJanuaryFebruary
Temperature & Rainfall
Temperature Range
33°
Warmest Month
17°
Coldest Month
Monthly Conditions
Month Comfort Temp Feels Rain Sky Humidity Wind UV Daylight
January Very Good 23° - 31° 30° 33 mm partly cloudy 76% 1.9 m/s 1.9 very high 11.4h
February Very Good 24° - 32° 32° 42 mm partly cloudy 77% 2.1 m/s 2.0 extreme 11.7h
March Good 25° - 33° 34° 100 mm partly cloudy 80% 2.2 m/s 2.2 extreme 12.0h
April Good 26° - 34° 37° 120 mm partly cloudy 80% 1.9 m/s 2.2 extreme 12.3h
May Acceptable 26° - 33° 37° 309 mm overcast 83% 2.0 m/s 2.1 extreme 12.5h
June Acceptable 26° - 32° 36° 636 mm overcast 86% 2.2 m/s 1.9 very high 12.7h
July Acceptable 26° - 32° 35° 608 mm overcast 86% 2.5 m/s 1.9 very high 12.6h
August Acceptable 25° - 32° 35° 743 mm overcast 87% 2.4 m/s 1.9 very high 12.4h
September Acceptable 25° - 31° 34° 576 mm overcast 87% 2.0 m/s 1.9 very high 12.1h
October Acceptable 25° - 32° 33° 337 mm overcast 84% 1.8 m/s 1.9 very high 11.8h
November Good 25° - 32° 32° 83 mm partly cloudy 81% 2.6 m/s 1.9 very high 11.5h
December Excellent 23° - 31° 30° 15 mm partly cloudy 78% 2.4 m/s 1.8 very high 11.3h
Getting There & Around

How to Get to Ko Wai

Boat transfers to Ko Wai run from Trat mainland piers and nearby islands (Koh Chang, Koh Mak); journey times vary but are generally short from neighboring island piers. Private transfer operators offer direct connections depending on season.

Tips for Visiting Ko Wai

  • Visit early morning for calm lagoons and the best snorkel visibility.
  • The island is small; use local longtail boats for short hop transfers rather than trying to travel over shallow reefs.
  • Bring cash - many small operators and restaurants accept only cash.