Weather in Koh Tao

Koh Tao’s weather does vary throughout the year, but you typically won’t experience cold temperatures. Instead, you can enjoy consistently warm and tropical weather, although occasional clouds and rain showers may be part of the package. There are three distinct seasons on the island, so let’s take a closer look at each of them below.

Koh Tao Seasons

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 its 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 its second ‘high season’ from July to September 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.

Monsoon Season Koh Tao Weather

Although the visibility and weather on Koh Tao are 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 see quite consistent rain, and 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 days without sun.

When Is the Best Time to Visit Koh Tao?

The best time to visit Koh Tao depends on your hobbies and preferences. If you are looking for the most favorable weather conditions, the dry season, which typically runs from December to February is the ideal time to explore the tropical paradise. During these months, you can enjoy the island’s pleasant climate with mild temperatures, clear skies, and calm seas. This period is especially good for diving and snorkeling, as the underwater visibility is excellent. Be prepared, though, for slightly higher hotel prices because of the high season.

Are you traveling from Chumphon? Check out how to get from Chumphon to Koh Tao during any season.

Alternatively, if you’re on a budget and don’t mind occasional rain showers, visiting Koh Tao during the shoulder seasons or the early part of the rainy season (June to November) can be a good budget-friendly option. While the weather can be less predictable during these months, and diving conditions may not be as optimal, you’ll benefit from cheaper hotels and fewer crowds. Keep an eye on the current weather forecast and dive conditions if you plan any water activities. But in general, these off-peak times are a great and cost-effective way to experience Koh Tao’s natural beauty and vibrant culture.