When To Go · Destination Guide
Wrecks, coral gardens, and slow-island beach days in Thailand's eastern Gulf
Updated Jan 23, 2026 • 16 sources
When to go
This corner of the Gulf of Thailand is strongly seasonal.
Best overall window
Drier weather, calmer seas for ferries and day boats, water around 28°C.
Outside that window
Rainy season and rougher sea crossings; some operators reduce schedules or cancel on wind.
Start with the overall answer, then switch only when scuba, freedive, snorkel, or topside timing changes the trip in a meaningful way.
The overall row stays visible so you can compare it against the currently selected scope.
| Scope | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Overall | Overall - Jan: Best | Overall - Feb: Best | Overall - Mar: Best | Overall - Apr: Best | Overall - May: Good | Overall - Jun: Tradeoffs | Overall - Jul: Tradeoffs | Overall - Aug: Tradeoffs | Overall - Sep: Tradeoffs | Overall - Oct: Good | Overall - Nov: Best | Overall - Dec: Best |
These do not replace the overall planner. Use them only if a specific animal or event is driving your trip dates.
Waterfalls at peak flow
Best for Topside
Jul to Oct
Rainyseason volume makes waterfall hikes on Koh Chang and Koh Kood more dramatic.
Songkran (Thai New Year)
Best for Topside
Apr
April brings Thailand's famous water festival.
Best shot at clear-water snorkel days
Best for Snorkel, Scuba
Jan to Mar
A run of calmseason days often delivers the clearest snorkeling around the nationalpark islands.
Sea turtle-friendly shallow reefs
Best for Snorkel, Scuba, Freedive
Nov to Apr
Shallow reefs around Koh Kood and the park islands can produce turtle sightings, especially when visibility is good and crowds are lower.
Built from climate references, access rules, and destination operators. Wildlife timing and route flexibility can shift year to year.