Weather In Koh Tao And Tourist Seasons

A little cloud makes for gorgeous sunsets

A little cloud makes for gorgeous sunsets

The weather in Koh Tao does change from season-to-season, but visitors will usually never feel cold and instead be treated to tropical temperatures, even if they also have to put up with the odd bit of cloud and rain. There are three fairly distinct seasons, however, so here is a rundown of them all.

High Season Koh Tao Weather

During the high season from December to February, the weather is at its best, with temperatures hovering at around 30°C, with clear skies and light breezes typical of a glorious European summer.


The seas are also usually calm and clear at this time of year. Despite still being hot, this period is Thailand’s winter and, as the heat is less intense and muggy than the rest of the year, it is considered to be the best time to visit. Prices, however, increase dramatically due to this fact.

There is the odd tropical downpour around December, but visitors will usually be treated to a completely rain-free holiday during this time. It is certainly not worth packing waterproofs if you’re holidaying in high season, as the only time you'll be getting wet is during diving trips with visibility of around 15m.

Hot Season Koh Tao Weather

Koh Tao experiences some showers around February and March, but from April to May is classed as Thailand’s summer and, as such, the weather on Koh Tao can become extremely stifling during this time. Temperatures can commonly reach 40°C and there is usually no rain to freshen things up each day. The sea is typically calm, with low tides that lead to shallow waters on many beaches but visibility is at it's best for diving trips.

The sky can also often be cloudy, although the UV rays remain more than strong enough for tanning enthusiasts. Locals living on the island tend to slow their pace of life down to cope with the heat and humidity. Although this is a sweaty and sometimes exhausting time to visit, prices are much cheaper and, as long as you’re near enough to some water to jump into, you can enjoy a perfectly pleasant holiday.

Koh Tao experiences it's second 'high season' from July to Septemner to coincide with the European school holidays, and it can be a problem to find accommodation. Afternoon thunderstorms come with the southwest winds around June and can last until September when things brighten up a little.

Note: To find more the best rate Hotels in Koh Tao. We recommend you look online at They seem to be the most competitively priced of the hotels sites.

Monsoon Season Koh Tao Weather

Although the visibility and weather on Koh Tao is fairly good between September and October, after this period there is heavy rain up until the first week of December.

Although you can experience the odd rather depressing day when it will rain constantly, storms usually only last around an hour when they come, and they can be quite refreshing and fun if you’re a fan of dramatic weather.

Despite these downpours you can still expect some sunshine, clear skies and temperatures of around 27-35°C. This is probably the best time for an off-season holiday, as prices are considerably lower for both accommodation and scuba diving due to the lack of crowds.

November and December sees quite consistent rain, although the monsoon season in Koh Tao is notoriously hard to predict, it is generally fairly mild. The seas can get quite rough in this period, but it is rare to have a stretch of more than a few of days without sun.

Koh Tao Weather by Month

January is one on the coolest months on the island, with average temperatures below 30°C. There is some heavy rain but travellers can expect at least two out of three dry days, while humidity levels are relatively low. Diving and snorkelling conditions are excellent due to the clear water.

February is the driest month of the year with little or no rainfall at all. Average temperatures remain just below 30°C and visitors can expect the days to be sun-filled. One of the best months of the year for both sunbathing and diving.

March sees the crossover between the cool season and the hot season. The beginning of the month will be much the same as January and February, although towards the end will see a notable increase in temperate and humidity with it regularly being above 30°C. However, rainfall remains fairly low.

The island enters its hottest period of the year, with the average temperature at 32°C. The stifling heat is only occasionally broken up by rainfall, so visitors are advised to take breaks away from the sun. The nighttimes are hot making air-con fairly important, while the water temperature also picks up in April.

Once more there are average temperatures of over 30°C and they can even reach 40°C at times, but a benefit in May is there is a little more wind and rain can be expected at least once every two days, ensuring intervals from the unbearable heat. It is advisable to carry waterproofs on day trips in case of a sudden downpour.


June experiences a marginal drop in the temperature while precipitation levels are not as high as in April. Downpours are still fairly common though and regular cloud cover makes for not the best sunbathing conditions. Those taking day trips are advised to take protections against all eventualities.

Temperatures in July are much the same as June, with an average high of 31°C and six hours of sunshine per day. In general, it only rains when there is a tropical depression or typhoon in the South China Sea which drops the air pressure and drags the west coast monsoon across. Humidity is relatively high and it may be wise to take regular breaks from the heat.

August sees a gradual increase in rain but still a number of dry days, while the temperature remains roughly the same as previous months. Humidity is still quite high and at times uncomfortable so the rain can sometimes arrive as a relief. Diving conditions are also very good with excellent visibility.

September sees a marked increase in heavy downpours although the weather is still splendid most of the time. However, the periods are often over relatively quickly or occur at night time so visitors can still expect warm, sunny days, and decent diving visibiluty - just remember to pack the waterproofs just in case!

The weather gets slightly cooler this month but there is sitll not much rainfall. Tropical storms, torrential downpours and flooding can happen with 275mm of rain. Cloud cover also increases meaning it’s not the best month for sun-worshippers, although the cooler evenings do provide a pleasant experience.

This is where the monsoon season starts properly with almost twice as much rainfall as the second wettest month (October). It is normal to experience three or four torrential downpours each day, while the wind also picks up – a factor which travellers who travel from seasickness should consider if travelling to the island. There are, however, sunny periods during the day with a fairly pleasant temperature.

The rain dramatically eases off in December although heavy showers are still common, particularly at the beginning of the month. The average daytime temperature is just below 30°C, while the evenings are cool and pleasant. Keen sunbathers can expect seven hours of sun a day, while the sea temperature drops to its coolest level.

blog comments powered by Disqus