Andaman vs Gulf Coast (Choose the Right Islands by Month)
A coast-by-month decision engine for Thailand islands. Compare Andaman vs Gulf sea conditions, route reliability, best base islands, and fallback plans if crossings are rough.
Last updated: February 22, 2026
If your trip includes islands, this is your highest-impact decision. Rain is often manageable; sea conditions can cancel tours, make crossings miserable, and turn a “short hop” into a full transfer day.
Quick summary
- First-timers: choose ONE coast for 7–10 days and keep transfers simple.
- Andaman bases: Phuket / Krabi / Lanta style routes (dramatic scenery).
- Gulf bases: Samui / Phangan / Tao style routes (classic island trio).
- Check sea conditions when hopping islands: Sea Conditions Ferries
- For a full island picker by vibe: Islands Planner
Coast decision table (month-by-month)
Legend: ✅ recommended · ⚠️ caution (plan buffers) · ❌ avoid boat-heavy routes
(Always double-check current sea state: Sea Conditions Ferries)
| Month | Andaman (Phuket/Krabi/Lanta) | Gulf (Samui/Phangan/Tao) | Best “safe” approach |
|---|---|---|---|
| Jan | ✅ | ✅ | Either coast; book early (peak season) |
| Feb | ✅ | ✅ | Either coast; heat starts rising |
| Mar | ✅ | ✅ | Either coast; watch heat + north AQI |
| Apr | ✅ | ✅ | Great beaches; avoid transfer chaos during Songkran week |
| May | ⚠️ | ✅/⚠️ | Prefer Gulf for simpler seas; keep buffers |
| Jun | ⚠️ | ✅/⚠️ | Gulf often easier; Andaman still fine with conservative planning |
| Jul | ⚠️/❌ | ✅/⚠️ | Avoid aggressive Andaman hopping; choose 1 base + day trips |
| Aug | ❌ | ⚠️ | Choose stable bases; reduce speedboat dependencies |
| Sep | ❌ | ⚠️/✅ | Gulf often more workable than Andaman; avoid tight transfer chains |
| Oct | ⚠️ | ⚠️/❌ | Transition: Andaman improves; Gulf can start getting rough later |
| Nov | ✅ | ⚠️ | Andaman usually easiest; Gulf can still be fine with planning |
| Dec | ✅ | ⚠️ | Peak season: Andaman easiest; Gulf can be wetter later |
Best base islands by coast
Andaman (west coast)
Start here if you want dramatic scenery and flexible day trips:
Gulf (east coast)
Start here if you want the classic trio route:
- Samui: Koh Samui
- Phangan: Koh Phangan
- Tao (diving hub): Koh Tao
If you want calmer “quiet island” alternatives:
Route templates (7 and 14 days)
7 days (first-timer, low stress)
Option A (Andaman): Bangkok (1–2) → Krabi or Phuket (5–6)
Option B (Gulf): Bangkok (1–2) → Samui or Phangan (5–6)
Use the full itinerary guides:
- 7 days: Itinerary 7 Days
- 14 days: Itinerary 14 Days
14 days (classic Thailand)
Option A (Andaman route): Bangkok → Chiang Mai (optional) → Krabi/Phuket base
Option B (Gulf route): Bangkok → Chiang Mai (optional) → Samui/Phangan/Tao (choose 2, not all 3 if you hate transfers)
If seas are rough: Plan B
When the sea is rough, you can still have an excellent trip. Use one of these:
- Stay put and do land activities (food, temples, viewpoints, spas)
- Switch to city days (Bangkok) for culture/shopping/night markets
- Choose a sheltered base and reduce boat dependencies
- Delay crossing by 24 hours (buffer days are cheaper than ruined trips)
Useful tools:
- Sea conditions: Sea Conditions Ferries
- Weather interpretation: Weather
- Travel time estimator: Travel Time Estimator
Common mistakes
- Trying to do both coasts in 7–10 days
- Booking a flight on the same day as a long speedboat crossing
- Choosing 3 islands “because they’re close” (transfer math wins)
- Ignoring sea state because the sky looks clear
FAQs
Q: Can I do Phuket and Samui in one week?
A: You can, but you’ll spend too much time transferring. Pick one coast for 7–10 days.
Q: Is the rainy season automatically bad for islands?
A: No. Rain can be fine; the key constraint is sea state and route exposure.
Q: Which coast is better for first-timers?
A: Both can be great. Choose based on your month, then base in one place and do day trips.
Q: What’s the easiest island plan for families?
A: Pick one comfortable base (often Phuket area or Samui) and reduce transfer days.
Q: How do I check if ferries/speedboats will be rough?
A: Use sea-condition tools and operator notices. Always build buffer time on island-hopping trips.
Next steps
- Islands planner (by vibe): Islands Planner
- Phuket vs Krabi: Phuket Vs Krabi
- Plan by month hub: Plan By Month
- Sea conditions tool: Sea Conditions Ferries
How we verify month guidance
Thailand weather and seasons shift year to year, so we treat month pages as “planning ranges” and re-check the most volatile items regularly:
- Season definitions and transitions: Thailand.go.th seasonal guidance and official announcements
- Weather advisories: Thai Meteorological Department warnings (especially wind/waves for island travel)
- Festival timing: Tourism Authority of Thailand pages (many festivals follow the lunar calendar)
Last updated: February 22, 2026