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Similan Island

Similan Island 1
Travel Info
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Travel Info

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Similan Island Weather, Climate and Best Time to Visit

Data source：Meteostat
Update date：2025-09

Similan Island year round climate

  • Spring (March–May): Average 27.7–28.5°C, hot climate. March has almost no rainfall, while April and May see gradually increasing rainfall. Common activities: Scuba diving, snorkeling, sunbathing. Recommended clothing: Light, short-sleeved clothing, swimwear, sun protection clothing.
  • Summer (June–August): Average 27.1–27.6°C, hot and humid climate. June and August have more rainfall. Common activities: Scuba diving, snorkeling, but be aware of the rainy season's impact. Recommended clothing: Light and breathable short-sleeved clothing, swimwear, rain gear.
  • Autumn (September–November): Average 26.4–26.7°C, hot climate with heavier rainfall; September is the peak of the rainy season. Common activities: Scuba diving, snorkeling, but be aware of sea conditions and rainfall. Recommended clothing: Light and breathable short-sleeved clothing, rain gear.
  • Winter (December–February): Average 26.7–27.1°C, warm climate with less rainfall. Common activities: Scuba diving, snorkeling, sunbathing. Recommended clothing: Light short-sleeved clothing, swimwear.

Similan Island climatological average

Annual average temperature: approx. 27.2°C / Annual rainfall: approx. 2962 mm / Summer humidity: 75%–85% / Rainiest month: September

Similan Island monthly average temperature and precipitation

Month
Air temperature (°C)
Precipitation (mm)
January
26.8°C
49.1
February
27.1°C
171.3
March
27.7°C
0
April
28.5°C
40.1
May
28.1°C
445.6
June
27.6°C
578.5
July
27.1°C
0
August
27.1°C
373.6
September
26.4°C
611
October
26.4°C
287.1
November
26.7°C
292.3
December
26.7°C
113.9

Similan Island weather for the next seven days

5/11
Monday
Patchy rain nearby
32.3°C/26.2°C
5/12
Tuesday
Moderate rain
30.1°C/26.2°C
5/13
Wednesday
Patchy rain nearby
29.7°C/26.2°C
5/14
Thursday
Moderate rain
30.1°C/26.5°C
5/15
Friday
Moderate rain
29.8°C/26.7°C
5/16
Saturday
Heavy rain
29.2°C/26.9°C
5/17
Sunday
Heavy rain
28.1°C/26.9°C

Similan Island Frequently Asked Questions and Useful Information for Travel

Is Similan Island worth visiting?

The Similan Islands are arguably the most picturesque in all of Thailand, making them a popular destination for travelers from around the world. World-class diving, stunning natural landscapes, and diverse wildlife are just a few of the reasons to visit this unique archipelago in the Andaman Sea.

Why are Similan Islands closed annually?

The Similan Islands close each year to allow the marine and island ecosystems to recover from tourism and protect visitors from dangerous weather conditions during the monsoon season. This closure supports coral regeneration, marine life recovery, and vegetation growth.

How long does it take to get from Phuket to Similan Islands?

The travel time from Phuket to the Similan Islands involves a multi-stage journey. The boat ride itself is typically 2 to 2.5 hours by speedboat. The overall trip duration is a full day, often requiring an early start around 6 AM due to the land transfer to a pier near Khao Lak, followed by the sea journey. Your hotel location in Phuket can affect travel time to the pier, which can take 1.5 to 2.5 hours. A day trip is a long day, often returning to your hotel around 8 PM.

Is it possible to stay on Similan Islands?

Yes, you can stay on the Similan Islands, but only during the park's open season, typically from October to May. Accommodation options include basic camping or bungalows on islands like Koh Miang or Koh Similan. You will need to book in advance, often through the official national park system or a local tour operator, as facilities are limited. For divers and those wanting to stay overnight, a liveaboard boat is another way to experience the Similan Islands.

What are the main attractions on Similan Island?

The main attractions on Similan Island revolve around its breathtaking natural beauty and rich marine life. Visitors flock to experience world-class diving and snorkeling in crystal-clear waters, encountering vibrant coral reefs and diverse aquatic species. The islands themselves boast stunning white-sand beaches and dramatic rock formations, offering incredible opportunities for exploration and photography.