Climate and monthly weather forecast
Koh Chang, Thailand

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White sandy beach in Koh Chang, Thailand
White sandy beach in Koh Chang, Thailand

The climate of Koh Chang

Koh Chang, Thailand displays a characteristic Am or Tropical monsoon climate according to the Köppen climate classification. This climate type signifies rainfall during all months of the year, with a short dry season. Koh Chang is located in the eastern Gulf of Thailand and its proximity to the sea profoundly influences its climate.

Throughout the year, the temperatures on this tropical island range from lows of 20°C (68°F) during January and December to a warmer 24°C (75.2°F) in the month of May. High temperatures display a similar pattern, consistently hovering around 31-32°C (-25.6°F) during the year. The degree of fluctuation in temperatures is quite minimal as is characteristic of tropical regions.

Rainfall however shows significant disparity, with drier periods experienced in the early months of the year and particularly from January to April. The true monsoon effect is evident as the rain starts to increase from May onwards, reaching peak levels between June and October. The heaviest rainfall comes in August with 687mm (27.05"), followed by 598mm (23.54") in June.

Daylight hours extend from a shorter 11.4 hours in December to the longest day length in June and July of 12.8 hours. Correspondingly, sunshine hours follow a relatively cyclical pattern oscillating from 5 hours daily during the monsoon months to peak sunshine duration of 9 hours during January, February and December.

Sea temperatures in Koh Chang follow a subtle fluctuating yearly cycle from 27.7°C (81.9°F) in January to a peak of 30.3°C (86.5°F) in May. The Ultraviolet (UV) index remains consistently high at 12 from February to October in spite of rainfall, posing a year-round moderate to high risk of harm from unprotected sun exposure.

The best time to visit Koh Chang

Considering the climate patterns, November to February emerges as the best time to visit Koh Chang. Though temperatures remain steady around 20-30°C (-22°F), rainfall considerably decreases from November onwards providing ideal weather conditions for outdoor activities. The sea temperature during this period is a comfortable 28.6°C (83.5°F) to 29.3°C (84.7°F) making it suitable for water activities.

The worst time to visit Koh Chang

The period from June to October presents a considerable challenge for travelers due to the heavy monsoon rainfalls. The heavy rain, combined with high temperatures, could make this period less hospitable for visitors. In particular, the month of August, receiving the highest rainfall at 687mm (27.05"), could disrupt travel plans and outdoor activities.

Spring weather in Koh Chang

Spring in Koh Chang from March to May sees a gradual rise in rainfall, starting from 59mm (2.32") in March to a significant 351mm (13.82") in May. Temperatures remain warm with highs of around 32°C (89.6°F) and lows of 21-24°C (-11.2°F).

Summer weather in Koh Chang

Summer, which runs from June to August, is characterized by the highest rainfall levels of the year. Despite the rain, the temperatures remain steadily high, around 30°C (86°F). The sea temperature peaks around this time too, averaging 29.9°C (85.8°F) to 30.3°C (86.5°F).

Autumn weather in Koh Chang

Autumn, from September to November, is a transitional period. Rainfall levels decline from the summer highs, yet temperatures retain the warmth of the preceding months.

Winter weather in Koh Chang

Winter, particularly from December to February, sees a drop in rainfall to below 60mm (2.36") and comparatively lower temperatures with lows around 21°C (69.8°F). The sunshine hours increase to 9 hours per day making it an ideal time to visit.

Weather in January

A fresh start to the New Year begins with a blend of warmth and drizzle in Koh Chang, Thailand. January is a mild month with few rainfall days, thus making outdoor activities enjoyable without too many weather disruptions. The curious traveler will note the gradual increase in daytime temperature compared to the month prior, ushering in the steadily advancing warmth. Weather in January »

Weather in February

As the year eases into the second month, the climate of Koh Chang syncs rhythmically with this transition. February presents a slightly warmer, drier weather spell, where travelers can lounge under the sun for a little longer than in January. Weather in February »

Weather in March

The advent of March unveils a fluctuation in Koh Chang's climatic symphony. The air is perceptibly getting hotter compared to the preceding month, but the pleasures of beach activities continue to remain at their peak. The excellent balance of sunlight and rain from February progress into this month with minor variations. Weather in March »

Weather in April

When April makes its mark on the calendar, Koh Chang embraces the most heated season of the year. Compared to March, the change in temperature becomes more apparent, indicating the peak of the hot season. The levels of heat do not deter water-based activities, thanks to the warm sea temperature that persists from the previous month. Weather in April »

Weather in May

May rings in the bells for the rainy season in Koh Chang. Compared to the preceding month, a drastic increase in rainfall takes center stage, indicating the wet season's full swing. With the heat persisting from April, May ensures a natural sauna effect, suitable for visitors who enjoy high humidity. Weather in May »

Weather in June

June asserts a steady continuation on the weather patterns formed in Koh Chang during May. While the temperature remains relatively constant, the shift into Koh Chang's wettest month is simple to perceive. The sea, sustaining warmth from May, stays inviting to water enthusiasts. Weather in June »

Weather in July

Despite the calendar's progress, July's climate in Koh Chang seems to mirror the traits of June. As the prior mid-year trends continue, Koh Chang experiences a dominant rainy scenario that doesn't fluctuate greatly in temperature. Weather in July »

Weather in August

While the calendar rolls into August, Koh Chang's weather continues to follow the July pattern. The prominence of rainfall endured from July registers minor changes in temperature. The sea temperature starts its gradual descent after the peak in May, but water-based activities remain unaffected. Weather in August »

Weather in September

September witnesses a subtle change in the weather patterns in Koh Chang. While the rainfall days stay consistently high, there is a slight decline in rainfall from August, signifying the gradual transition to the dry season. Weather in September »

Weather in October

As October steps in, Koh Chang starts breaking away from the robust rainy patterns dominant since May. Temperature differences become more noticeable, as October starts edging into a cooler climate compared to September. Sunshine hours increase, inviting more outdoor activities and explorations. Weather in October »

Weather in November

November signals a prominent shift in Koh Chang's climatic patterns. With temperatures continuing their cooling trend from October, rainfall significantly decreases, indicating the dry season's onset. The lengthening daylight hours invite longer outdoor experiences. Weather in November »

Weather in December

December brings a festive mood, complemented by the pleasant weather in Koh Chang. It signifies a transition into comfortable temperatures from November and a welcoming reduction in rainfall. Sunshine dominates the scene as daylight hours lengthen, making outdoor activities even more appealing. Weather in December »
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Frequently asked questions

How much does it rain in Koh Chang?

In Koh Chang, during the entire year, the rain falls for 170 days and collects up to 3442mm (135.51") of precipitation.

What month is the sea coldest in Koh Chang?

With an average sea temperature of 27.7°C (81.9°F), January is the month with the coldest seawater.

What are the months with the most sunshine in Koh Chang?

January and December, with an average of 9h of sunshine, are months with the most sunshine in Koh Chang, Thailand.

What is the month with the lowest UV index in Koh Chang?

The months with the lowest UV index in Koh Chang, Thailand, are January, November and December, with an average maximum UV index of 10.

When is the highest UV index in Koh Chang?

February through October, with an average maximum UV index of 12, are months with the highest UV index.

What month is the hottest in Koh Chang?

April is the warmest month, with the temperature often reaching an average high of 32°C (89.6°F) and an average low of 23°C (73.4°F).

What is the month with the warmest sea water in Koh Chang?

The month with the warmest seawater in Koh Chang, Thailand, is May, with an average sea temperature of 30.3°C (86.5°F).

What are the coldest months in Koh Chang?

June through September and December, with an average high-temperature of 30°C (86°F), are the coldest months.

When are the longest days in Koh Chang?

The month with the longest days is June, with an average of 12h and 48min of daylight.

What are the months with the least sunshine in Koh Chang?

The months with the least sunshine in Koh Chang are June through September, with an average of 5h of sunshine.

What is the rainiest month in Koh Chang?

The month with the most rainfall in Koh Chang is August, when the rain falls for 25 days and typically aggregates up to 687mm (27.05") of precipitation.

What is the driest month in Koh Chang?

The month with the least rainfall is December, when the rain falls for 3 days and typically collects 26mm (1.02") of precipitation.

What is the month with the shortest days in Koh Chang?

With an average of 11h and 24min of daylight, December has the shortest days of the year.

Is there Daylight Saving Time (DST) in Koh Chang?

Koh Chang does not observe Daylight Saving Time (DST). +07 timezone is used over the entire year.

Average temperature
Koh Chang, Thailand

Average temperature - Koh Chang, Thailand

The warmest month (with the highest average high temperature) is April (32°C).
The months with the lowest average high temperature are June, July, August, September and December (30°C).

The month with the highest average low temperature is May (24°C).
The coldest months (with the lowest average low temperature) are January and December (20°C).

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Average rainfall
Koh Chang, Thailand

Average rainfall - Koh Chang, Thailand

The wettest month (with the highest rainfall) is August (687mm).
The driest month (with the least rainfall) is December (26mm).

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Average rainfall days
Koh Chang, Thailand

Average rainfall days - Koh Chang, Thailand

The month with the highest number of rainy days is August (25 days).
The months with the least rainy days are January and December (3 days).

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Average sea temperature
Koh Chang, Thailand

Average sea temperature - Koh Chang, Thailand

The best month for swimming (with the highest average sea temperature) is May (30.3°C).
The coldest month (with the lowest average sea temperature) is January (27.7°C).

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Average daylight / Average sunshine
Koh Chang, Thailand

Average daylight / Average sunshine - Koh Chang, Thailand

The month with the longest days is June (Average daylight: 12h and 48min).
The month with the shortest days is December (Average daylight: 11h and 24min).

The months with the most sunshine are January and December (Average sunshine: 9h).
The months with the least sunshine are June, July, August and September (Average sunshine: 5h).

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Average UV index
Koh Chang, Thailand

Average UV index - Koh Chang, Thailand

The months with the highest UV index are February, March, April, May, June, July, August, September and October (UV index 12).
The months with the lowest UV index are January, November and December (UV index 10).

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Koh Chang, Thailand

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