Similan Islands Best Time to Visit & Opening Season

Similan Islands Open Season

Month	Hours	Frequency	Notes
Oct 15- May 15	9:00am-5:30pm	Daily speedboat & catamaran tours	The national park is open for visits and tours
May 16 -Oct 14	-	Closed	Islands closed for monsoon season & coral restoration

Timing notes & visitor warnings

Boats to the Similan Islands operate only during the open season (Oct–May).
Bad weather or rough seas can lead to same-day cancellations. Always reconfirm the night before.
The last boats leave the islands around 3:30-4:00pm to return to Phuket or Khao Lak.
No overnight stays are currently allowed on the islands.
Bring sunscreen, dry bags, and motion-sickness medication for rough crossings.

Similan Islands tour options

From Phuket: Similan Islands Speedboat Tour with Breakfast, Lunch & Transfers

Free cancellation

Book now, pay later

10 hr.

Guided tour

Transfers included

Hotel pickup

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Check availability

From Phuket: Similan Islands Catamaran Tour with Breakfast, Lunch & Transfers

Free cancellation

Book now, pay later

12 hr.

Transfers included

Hotel pickup

Meals included

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Check availability

From Khao Lak: Similan Islands Speedboat Tour with Breakfast, Lunch & Transfers

Free cancellation

Book now, pay later

8 hr.

Guided tour

Meals included

‌

Check availability

Best time to go on a Similan Islands tour

Two people swimming in clear blue water near rocky shore, Similan Islands tour.

Peak season (November to April): This is the best time to visit the Similan Islands. The Similan Islands' weather is characterized by clear skies, calm seas, and excellent visibility for snorkeling and diving. It’s also the busiest period, with most**** Similan Islands day trips and Similan Islands tours from Phuket or Khao Lak operating daily. Expect slightly higher prices and limited slots, so early Similan Islands booking is recommended.

Low season (May to mid-October):The islands are closed to visitors during the monsoon season for reef conservation and safety. Heavy rains and rough seas make access impossible, and all Similan islands tours are temporarily suspended.

Shoulder months (October & May): The park may open or close depending on sea conditions. If open, these months offer fewer crowds and still-enjoyable weather, ideal for a quieter Similan day trip experience.

Speedboat at Similan Islands beach with tourists, Love Andaman tour.

Weekdays: Generally more relaxed and less crowded, especially for Similan day trips from Khao Lak. You’ll enjoy peaceful beaches, easier photo opportunities, and more time at each snorkeling spot.

Weekends: Expect more visitors and fully booked tours, especially during November to April. While the energy is lively, it’s best to book your Similan Islands tour from Phuket or Khao Lak in advance to secure spots on speedboats or catamarans.

How long does a Similan Islands tour last?

Speedboat near Similan Islands with snorkelers in clear blue water, surrounded by rocky shoreline.

A typical Similan Islands tour lasts between 8 to 13 hours, depending on your departure point and itinerary.

From Khao Lak: Expect around 8–9 hours total, with a shorter boat transfer and more time at the islands.
From Phuket: Tours can last up to 10-13 hours, including travel to Thap Lamu Pier and the speedboat or catamaran journey.

FAQs

Are the Similan Islands open year-round?

No, they’re open from October 15 to May 15 and closed during the monsoon for conservation.

What time do Similan Islands tours depart?

Most Similan Islands tours leave Phuket or Khao Lak between 7:00–9:00am, returning by 4:00 PM.

Can I stay overnight on the Similan Islands?

No, overnight stays are no longer permitted to protect the fragile ecosystem.

Do Similan Island day trips operate in bad weather?

Trips may be canceled during high winds or rain—check with your tour operator before departure.

When is the best time for snorkeling and diving?

From December to March, when sea conditions are calm and visibility reaches up to 30 meters.

How early do Similan Islands sunrise tours start?

For the Similan Islands, sunrise or early morning tours usually start around 6:00am to 7:00am. Early departures let you enjoy the calm morning waters, catch the sunrise over the islands, and explore popular snorkeling and sightseeing spots before the midday crowds and heat set in.

Can I visit the Similan Islands at sunrise?

Yes. Early morning departures allow visitors to witness sunrise over the islands, enjoy quiet beaches, and snorkel before the crowds arrive.

Do tour timings vary between Phuket and Khao Lak departures?

Yes. Pickups from Phuket are usually earlier than from Khao Lak since the pier for most tours is located near Khao Lak.