Koh Chang — Water Temperature, Sea Conditions & Trends
This page provides clear and up-to-date information about water temperature for Koh Chang (Trat province, Thailand). It includes the current water temperature, daily data for the last month presented in a simple chart, and a 7-day forecast. The page also compares today’s value with typical averages for this period, shows usual monthly ranges during the year, and lists nearby beaches with short descriptions. Local weather for the next few days and general details about Koh Chang help you plan your visit and choose the best time for swimming.
Current Water Temperature
Water temperature in Koh Chang in the Gulf of Thailand today is 31°C.
Water Temperature: Daily Trends, Historical Records, and Forecast
✅ As of today, the minimum water temperature is above 82°F (28°C). This is very warm water, which may feel almost hot to most people. Swimming in such conditions is perfect for those seeking relaxation and comfort in the water. These waters are often preferred for relaxation in hot weather, as the water temperature does not cool the body significantly. However, it is important to remember that in such warm waters, caution is necessary, as prolonged exposure without rest can lead to overheating.
It is important to note that these swimming tips and recommendations apply only in good weather. When the air temperature is below 68°F (20°C), and sometimes even below 77°F (25°C), swimming can be unpleasant even with relatively high water temperatures.
Water Temperature Chart Over the Last 30 Days
Water temperature in Koh Chang today is lower than both a week ago and a month ago. Currently, the sea water temperature at this location matches the average for this day in previous years.
According to our forecast, Water temperature in Koh Chang will be 30.0°C in the next 7 days. See the table below for daily data for the upcoming week.
Table of Daily Sea Temperature Data
| Date | Current | Average | Forecast |
|---|---|---|---|
| JUN 2 | 31.1°C | 30.8°C | |
| JUN 3 | 31.1°C | 30.5°C | |
| JUN 4 | 31.0°C | 30.8°C | |
| JUN 5 | 31.0°C | 30.3°C | |
| JUN 6 | 30.9°C | 30.8°C | |
| JUN 7 | 30.9°C | 30.3°C | |
| JUN 8 | 30.8°C | 30.8°C | |
| JUN 9 | 30.7°C | 30.8°C | |
| JUN 10 | 30.6°C | 30.8°C | 30.6°C |
| JUN 11 | 30.5°C | 30.5°C | |
| JUN 12 | 30.3°C | 30.4°C | |
| JUN 13 | 30.3°C | 30.3°C | |
| JUN 14 | 30.3°C | 30.2°C | |
| JUN 15 | 30.0°C | 30.2°C | |
| JUN 16 | 29.8°C | 30.1°C | |
| JUN 17 | 30.5°C | 30.0°C |
* Current - Actual water temperature value
** Average - Average water temperature on this day in recent years
*** Forecast - Our water temperature forecast
Actual nearshore water temperatures may fluctuate by several degrees from the reported values, especially following heavy rainfall or extended periods of strong winds. Certain wind patterns can cause colder, deeper waters to rise and replace the sun-warmed surface water, leading to noticeable variations.
Our forecast is based on a proprietary mathematical model that considers real-time water temperature changes, historical trends, key weather patterns, wind strength and direction, and air temperature specific to each region. Additionally, we incorporate data from other resorts to enhance accuracy.
Water temperature data for this location is gathered from various sources, including buoys and satellite sea and ocean surface maps provided by the NOAA agency. We also incorporate data from local authorities in each specific location worldwide to ensure more accurate temperature readings.
Annual Water Temperature Overview by Month
Monthly Water Temp Ranges
Annual Water Temperature Trend
Koh Chang, in Thailand’s Trat province, sits in the eastern Gulf of Thailand and enjoys warm sea conditions year-round. Sea surface temperatures typically range from about 26°C to 31°C over the course of a year. The coolest period is usually between December and February, when waters commonly sit around 26°C–28°C, while the hottest months from March to May often see temperatures of 30°C–31°C. During the monsoon season, roughly May to October, surface temperatures generally remain warm, around 28°C–30°C, though increased rainfall and runoff can reduce underwater visibility and make the sea feel cooler nearshore. Local variations occur by bay and depth, with sheltered coves tending to be slightly warmer than exposed headlands.
Monthly Water Temperature Range (Min, Max & Average)
| Month | Min | Avg | Max |
|---|---|---|---|
| January | 26°C | 28°C | 30°C |
| February | 26°C | 28°C | 31°C |
| March | 27°C | 29°C | 32°C |
| April | 29°C | 30°C | 33°C |
| May | 29°C | 31°C | 33°C |
| June | 28°C | 30°C | 32°C |
| July | 28°C | 29°C | 31°C |
| August | 28°C | 29°C | 31°C |
| September | 27°C | 29°C | 31°C |
| October | 28°C | 29°C | 32°C |
| November | 28°C | 30°C | 32°C |
| December | 27°C | 29°C | 31°C |
* Click on a month to view detailed water temperature data.
Koh Chang: Weather Forecast
June 11
June 12
June 13
Location, Beaches & Local Information
Nearby Beaches & Facilities
Chai Chet Resort
Great Beach
Chaiyam Beach
Lonely Beach
Kai Bae Beach
Khlong Prao Beach
Bailan Beach
Kong Koi Beach
Boat Chalet Koh Chang
Swimming Conditions
Swimming around Koh Chang is popular and accessible thanks to numerous sandy beaches and sheltered bays. In the drier months, calm seas and water temperatures around 29°C–31°C create comfortable conditions for long swims, snorkeling and casual wading off beaches such as White Sand and Klong Prao. During the wetter season the sea can be rougher and surfier, so swimmers should heed local advice, observe beach flag warnings and avoid isolated spots when currents intensify; even then, surface temperatures rarely drop below about 26°C. Snorkeling and short recreational dives are rewarding near reefs and offshore islets, while shallow bays provide family-friendly areas where warm water and protected conditions make a relaxed beach holiday feasible for most visitors.