Calm seas, clear water, and every island open — timing is half the trip.
What is the best month to visit phuket for island tours? November to April is the best window, with the calmest seas and clearest water; January to March is the sweet spot. If the Similan Islands are a priority, aim for their open season (roughly mid-October to mid-May), and note that Maya Bay closes each year around August and September.
The short answer
Best overall
For island tours, November to April is the standout window. This is the northeast-monsoon dry season on the Andaman coast, bringing calmer seas, clearer water and the most reliable boat schedules. January to March is often the very best — dry, bright and settled.
Months to approach with care
May to October is the green (southwest-monsoon) season: greener landscapes, lower prices and fewer crowds, but more rain and occasionally rough seas, so some sea trips are adjusted or postponed for safety.
Phuket’s two seasons explained
High season (November–April)
Dry, sunny and calm, with the best underwater visibility and every island trip running. It’s the busiest and priciest time, so early departures and advance booking pay off.
Green season (May–October)
Warm and lush with passing tropical downpours. Sheltered trips like Phang Nga Bay often run fine, while exposed open-water routes are more weather-dependent. Prices and crowds are lower.
Month-by-month for island tours
| Month | Sea & visibility | Crowds | Notes |
|---|---|---|---|
| Nov–Dec | Calm, clearing | Building | Season opens; festive peak late Dec |
| Jan–Mar | Calmest, clearest | High | Best all-round conditions |
| Apr | Warm, mostly calm | High | Hot; Songkran mid-April |
| May–Jul | More variable | Lower | Green season begins; Similan closes 15 May |
| Aug–Sep | Wetter, can be rough | Lowest | Maya Bay closed for conservation |
| Oct | Improving late month | Low | Similan reopens ~15 Oct |
Key closures to plan around
Similan Islands (open ~mid-Oct to mid-May)
Mu Ko Similan National Park closes for the monsoon, most recently from 15 May, reopening around 15 October. If world-class reefs are your goal, you must travel in the open season — and book ahead, as seats fill near the closing date. The seasonal closure was reported here.
Maya Bay (closed ~Aug–Sep)
Maya Bay closes annually for recovery, most recently 1 August to 30 September, reopening 1 October. During the closure the wider Phi Phi trip still runs; you view Maya Bay from the water. See the Department of National Parks for official dates.
Best month by priority
- Clearest water: January to March
- Similan reefs: mid-October to mid-May (aim Nov–Apr for best conditions)
- Lower prices: May to October (green season)
- Fewer crowds: shoulder months like November and late April
- Everything open: October to July, avoiding the Aug–Sep Maya Bay closure
What to expect in green season
Don’t write off May to October entirely. Many days are bright with only short, heavy showers, and sheltered trips such as Phang Nga Bay usually run as normal. You’ll enjoy lower prices, greener scenery and quieter sites — just build in a flexible day and book with an operator that reschedules for weather. Our advance-vs-arrival guide helps you plan around this.
Tips for picking your month
- Decide whether clear water, value or quiet matters most
- Cross-check the Similan and Maya Bay seasons against your dates
- Favour November–April for the widest choice of trips
- Book popular high-season tours well ahead
- Keep one flexible day for the weather in any season
See which trips suit your dates in our best day trips guide, or tell us your travel month for a tailored suggestion. General info is on the official Phuket page.
Frequently asked questions
What is the best time of year to visit Phuket for island tours?
November to April, the dry season, offers the calmest seas and clearest water, with every island trip running. January to March is usually the very best for conditions.
What is the best month to visit the Similan Islands?
Within the open season of roughly mid-October to mid-May, the months of November to April give the calmest seas and best visibility. The park is closed during the monsoon for conservation and safety.
Is it worth visiting Phuket in the green season?
Yes, if you want lower prices and fewer crowds. Many green-season days are bright with only short showers, and sheltered trips like Phang Nga Bay usually run. Build in a flexible day for weather.
When is Maya Bay closed?
Maya Bay closes annually for environmental recovery, most recently from 1 August to 30 September, reopening 1 October. During the closure the wider Phi Phi trip still runs, viewing the bay from the water.
What is the rainy season in Phuket?
The green (southwest-monsoon) season runs roughly May to October, bringing more rain and occasionally rough seas. Rain often comes in short, heavy bursts rather than all-day downpours.
Which month has the fewest crowds for island tours?
The green-season months (especially May–September) are quietest, though wetter. For a balance of decent conditions and smaller crowds, the shoulder periods of November and late April work well.
Plan with confidence
Phi Phi trips involve sea travel and adventure activities, and itineraries can change with tides, weather and national-park conditions. Departures may be adjusted or rescheduled when the sea is rough. For a smoother experience, book with a TAT-licensed operator (License No. 34/02294), choose an early departure, and confirm current prices, inclusions and availability at the time of booking. Bring reef-safe sunscreen and follow ranger guidance inside the national park.
Book your Phi Phi trip with Phuket Thailand Travel
Phuket Thailand Travel is operated by True Design Holidays Co., Ltd., a TAT-licensed travel agency (License No. 34/02294) based in Kathu, Phuket. We run island tours, private charters, transfers and packages across the Andaman.
- Address: 113/297, Soi 10, M A, 7 Vichitsongkram Rd, Kathu, Phuket 83120
- Phone: +66 (0) 96 469 0456 · WhatsApp · LINE
- Browse island-hopping tours: view the tour & enquire or contact our team