Similan Islands in October
Not the best time
Transition month where islands may reopen but conditions remain iffy. Budget-friendly but risky - you might lose entire days to weather cancellations.
Weather
Monsoon winds begin shifting but weather remains highly unpredictable. Some clear days mixed with sudden storms. Seas start calming but visibility underwater is still poor from stirred-up sediment.
32°C high24°C low15 rain days
Crowds & Cost
low crowds
~$100/day average
Events & Festivals
- •Vegetarian Festival in Phuket
- •King Chulalongkorn Memorial Day
October Tips
- •Islands typically reopen mid-October but check current status
- •Early season trips often get cancelled due to weather
- •Prices start low but increase quickly once conditions improve
All Months
The islands close completely from May 15 to October 15 due to monsoon conditions. Your window runs November through April, with distinct seasons within that period. November and December offer the calmest seas and best visibility for diving - often 35-40 meters. But expect higher prices and crowds, especially around Christmas. January through March delivers the most reliable weather with minimal rain and gentle breezes. This is peak season, so book accommodations and liveaboards well ahead. April sees rising temperatures (35°C daily) and occasional afternoon storms, but fewer crowds and better deals. The shoulder months of late October and early May can be spectacular if weather cooperates, but you're gambling on conditions. Water temperature stays warm year-round at 27-29°C. Northeast monsoon winds from December to February can make some dive sites choppy, but generally create better visibility.
Similan Islands Scores
Solo
7/10
Couples
8/10
Families
6/10
Adventure
9/10
Budget
5/10
Luxury
7/10
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