The great thing about Koh Tao is that because it is just a small island, we can travel around the whole place by boat in less than an hour. Which means then that whenever the weather is bad & blustery & there are big seas then we can always find a suitable, calm area, where the visibility hasn’t been too disturbed, to dive at throughout the year.
In addition, because Koh Tao is just a small landmass the growing rain clouds that form often don’t unleash their aquatic unpleasantness till they are over the larger landmasses of our neighbours Koh Samui & Koh Phangan. So when our friends there are getting soaked our friends here are soaking in sunshine.
January & February
Are perfect beautiful months of sunshine, flat seas & swimming off the beach. The water on the west coast of the island is completely flat calm but visibility can be a little temperamental with the knock on effects of monsoon seas especially in early Jan. February tends to be gorgeous! & heaps of sharks!
March, April & May - Summer Time!
It gets hot! April gets really hot! But the water is fine, & everyday is guaranteed sunshine. And gorgeous sunsets! Can get some good tropical style thunderstorms at this time of year especially at dusk but they’re usually on the mainland, which can make for quite a spectacle sitting on the beach in Koh Tao while looking at the thunderbolts of lightening on the mainland. Water clarity is best at this time of year & your chances of seeing Whalesharks are much higher than at any other time of year.
June, July & August
The wind turns at this time of year & the west coast of the island experiences a fresh cooling breeze & occasional days of relatively big waves. Afternoon storms can be very typical especially in August but they don’t last long & weather is still generally pretty sunny throughout the day. Diving is best on the East side of the island where it is flat calm, crystal clear & teeming with marine life. A good season for turtles too.
September & October
Very beautiful long sunny days, calm flat seas & superb diving. Water & Air temperature drops a little as we enter the ‘winter’ months but still tropical. Average daytime air & water temperature 30 degrees. Heaps of fish, high potential of seeing whalesharks, & not so many divers- Quiet season!
November & December - Monsoon Season!
Koh Tao doesn’t suffer from your usual movie monsoon madness, as it isn’t relentless rain for days on end. A typical monsoon usually consists of a couple of weeks on & off of impressively hard rain & quite a lot of wind. The visibility gets stirred up & the swell can be rather unpleasant. The journey to Koh Tao at this time of the year is definitely going to be bouncy. Do please take seasickness pills!