Boulder City

Best months: Jan–May

Protected Area

Mu Ko Similan

Why dive here

With 173+ marine species recorded in the area - including blacktip reef sharks, eagle rays, giant moray eels, whale sharks and clownfish - Boulder City offers some of Similan Islands's richest diving. Water ranges 29-31°C, warmest April, May, June.

Best timeJan–May

WetsuitA 3mm shorty or thin full wetsuit

Marine lifeBlacktip Reef Sharks, Eagle Rays, Giant Moray Eels, Whale Sharks and Clownfish · 173+ species recorded

Water29-31°C · warmest April, May, June

StandoutExceptional marine biodiversity

Boulder City, in the Similan Islands, is a dive site built around a collection of large granite boulders. It’s a rocky site, with crevices and swim-throughs formed by the stacked rocks. We’ve found it’s a good spot for divers who enjoy exploring the nooks and crannies, rather than open reef. You'll likely see smaller reef fish darting around the rocks.

Today06:1818:1611h 59m daylightGolden hour 17:48

Reviews for Boulder City

Conditions

Ocean conditions, forecast and tides for Boulder City

Boulder City Ocean Conditions

Monthly averages for Boulder City, sourced from Open-Meteo marine data + Copernicus Marine (EU) - nearest station: Open-Meteo marine grid (8.1, 98.3) (6km away)