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Koh Samui
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Water Temperature in the Gulf of Thailand in Koh Samui, Thailand: Current, Historical Data and Forecast
On this page, you will find comprehensive information about the sea temperature in Koh Samui in Thailand, including current readings, historical data and trends, monthly averages, as well as weather forecasts and upcoming temperature predictions. We find every spot where you can swim and tell you what the water temperature is there today and throughout the year.
Current Water Temperature in Koh Samui
29.0°C
TODAY
28.9°C
YESTERDAY
28.2°C
A WEEK AGO
Analysis, Historical Data, and Forecast of Water Temperature
Today sea water temperature in the Gulf of Thailand in Koh Samui is 29°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 for Gulf of Thailand in Koh Samui Over the Last 30 Days
The water temperature in Koh Samui today is lower than both a week ago and a month ago. Today's sea temperature is slightly higher than on the same day in previous years.
According to our forecast, the sea temperature in Koh Samui will remain nearly unchanged in the coming days, its value will be 28.6°C.
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 across Thailand to enhance accuracy.
Water temperature data for Koh Samui and nearby towns and resorts 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.
Table of Daily Sea Temperature Data
| Date | Current | Average | Forecast |
|---|---|---|---|
| Feb 15 | 28.2°C | 28.3°C | |
| Feb 16 | 28.2°C | 28.5°C | |
| Feb 17 | 28.1°C | 27.8°C | |
| Feb 18 | 28.3°C | 27.8°C | |
| Feb 19 | 28.0°C | 28.0°C | |
| Feb 20 | 28.2°C | 28.0°C | |
| Feb 21 | 28.9°C | 28.3°C | |
| Feb 22 | 27.9°C | 28.3°C | |
| Feb 23 | 28.0°C | 28.8°C | |
| Feb 24 | 28.0°C | 28.7°C | |
| Feb 25 | 28.3°C | 28.6°C | |
| Feb 26 | 28.3°C | 28.6°C | |
| Feb 27 | 28.5°C | 28.6°C | |
| Feb 28 | 28.3°C | 28.6°C | |
| Mar 1 | 28.5°C | 28.6°C | |
| Mar 2 | 28.5°C | 28.6°C |
Sea Temperature in Koh Samui Throughout the Year
Throughout the year, the sea temperature in Koh Samui is always above 64°F (18°C), the sea temperature exceeds 72°F (22°C) for 366 days, and exceeds 77°F (25°C) for 366 days.
Below is the annual chart of sea temperature changes in the Gulf of Thailand in Koh Samui.
January
| Minimum | Average | Maximum |
|---|---|---|
| 26°C | 28°C | 30°C |
February
| Minimum | Average | Maximum |
|---|---|---|
| 26°C | 28°C | 30°C |
March
| Minimum | Average | Maximum |
|---|---|---|
| 27°C | 29.5°C | 32°C |
April
| Minimum | Average | Maximum |
|---|---|---|
| 29°C | 31°C | 33°C |
May
| Minimum | Average | Maximum |
|---|---|---|
| 29°C | 31°C | 33°C |
June
| Minimum | Average | Maximum |
|---|---|---|
| 29°C | 30.5°C | 32°C |
July
| Minimum | Average | Maximum |
|---|---|---|
| 28°C | 29.5°C | 31°C |
August
| Minimum | Average | Maximum |
|---|---|---|
| 28°C | 30°C | 32°C |
September
| Minimum | Average | Maximum |
|---|---|---|
| 28°C | 30°C | 32°C |
October
| Minimum | Average | Maximum |
|---|---|---|
| 28°C | 29.5°C | 31°C |
November
| Minimum | Average | Maximum |
|---|---|---|
| 27°C | 29°C | 31°C |
December
| Minimum | Average | Maximum |
|---|---|---|
| 26°C | 28°C | 30°C |
Monthly Water Temperature Histogram for Gulf of Thailand in Koh Samui
You can explore detailed data on how the water temperature in Koh Samui varies each month:
What Beaches Are There In and Around Koh Samui?
Ao Chaweng Yai
Ao Chaweng Yai is a 1-stars sandy beach, located in a 5 km (3 miles) radius of Koh Samui.
Chaveng Noah Beach
Chaveng Noah Beach is a 2-stars sandy beach, located in a 5 km (3 miles) radius of Koh Samui. There is parking. There are cafés.
Mercure Beach
Mercure Beach is a 2-stars sandy beach, located in a 5 km (3 miles) radius of Koh Samui. There is parking. There are cafés.
Bangrank Golden Mile Beach
Bangrank Golden Mile Beach is a 2-stars sandy beach, located in a 6 km (4 miles) radius of Koh Samui. There is parking. There are cafés.
Lamai Beach
Lamai Beach is a 2-stars sandy beach, located in a 6 km (4 miles) radius of Koh Samui. There are cafés. The calm waters make this beach ideal for swimming, providing a safe and enjoyable experience for all visitors.
Bophut Beach
Bophut Beach is a 4-stars sandy beach, located in a 6 km (4 miles) radius of Koh Samui. There are restrooms. There are cafés. Snorkeling is possible. The calm waters make this beach ideal for swimming, providing a safe and enjoyable experience for all visitors.
Chaweng Beach
Chaweng Beach is a 5-stars sandy beach, located in a 6 km (4 miles) radius of Koh Samui. There are lifeguards on the beach. There is parking. There are restrooms. There are cafés. Chaweng Beach is an excellent spot for fishing enthusiasts, offering good opportunities to catch local fish. Snorkeling is possible. It is suitable for surfing. The calm waters make this beach ideal for swimming, providing a safe and enjoyable experience for all visitors.
Lamai
Lamai is a 3-stars sandy beach, located in a 6 km (4 miles) radius of Koh Samui. There is parking. There are cafés. Snorkeling is possible. The calm waters make this beach ideal for swimming, providing a safe and enjoyable experience for all visitors.
Dog Beach
Dog Beach is a 2-stars sandy beach, located in a 6 km (4 miles) radius of Koh Samui. There is parking. There are cafés.
Hua Thanon Beach
Hua Thanon Beach is a 4-stars sandy beach, located in a 7 km (4 miles) radius of Koh Samui. There is parking. There are restrooms. There are cafés. Hua Thanon Beach is an excellent spot for fishing enthusiasts, offering good opportunities to catch local fish. The calm waters make this beach ideal for swimming, providing a safe and enjoyable experience for all visitors.
Laem Nan Beach
Laem Nan Beach is a 4-stars sandy beach, located in a 7 km (4 miles) radius of Koh Samui. There is parking. There are cafés. Laem Nan Beach is an excellent spot for fishing enthusiasts, offering good opportunities to catch local fish. Snorkeling is possible. The calm waters make this beach ideal for swimming, providing a safe and enjoyable experience for all visitors.
Maenam Beach
Maenam Beach is a 3-stars sandy beach, located in a 7 km (4 miles) radius of Koh Samui. There are cafés. Snorkeling is possible. The calm waters make this beach ideal for swimming, providing a safe and enjoyable experience for all visitors.
Big Buddha Beach
Big Buddha Beach is a 4-stars sandy beach, located in a 7 km (4 miles) radius of Koh Samui. For those who prefer clothing-optional beaches, Big Buddha Beach is a designated nudist beach. There is parking. There are restrooms. There are cafés. The calm waters make this beach ideal for swimming, providing a safe and enjoyable experience for all visitors.
Silver Beach
Silver Beach is a 4-stars sandy beach, located in a 7 km (4 miles) radius of Koh Samui. There is parking. There are restrooms. There are cafés. Snorkeling is possible. The calm waters make this beach ideal for swimming, providing a safe and enjoyable experience for all visitors.
W Beach
W Beach is a 1-stars sandy beach, located in a 7 km (4 miles) radius of Koh Samui.
Mae Name Beach
Mae Name Beach is a 4-stars sandy beach, located in a 7 km (4 miles) radius of Koh Samui. There is parking. There are restrooms. There are cafés. Snorkeling is possible. The calm waters make this beach ideal for swimming, providing a safe and enjoyable experience for all visitors.
Thongtakian Beach
Thongtakian Beach is a 4-stars sandy beach, located in a 7 km (4 miles) radius of Koh Samui. There are restrooms. There are cafés. Snorkeling is possible. The calm waters make this beach ideal for swimming, providing a safe and enjoyable experience for all visitors.
Bang Kao Beach
Bang Kao Beach is a 3-stars sandy beach, located in a 8 km (5 miles) radius of Koh Samui. There is parking. There are restrooms. There are shops. There are cafés.
Koh Samui
Koh Samui is a 2-stars sandy beach, located in a 9 km (6 miles) radius of Koh Samui. For those who prefer clothing-optional beaches, Koh Samui is a designated nudist beach. Snorkeling is possible.
Coral Beach
Coral Beach is a 2-stars sandy beach, located in a 9 km (6 miles) radius of Koh Samui. There is parking. There are cafés.
Koh Samui Weather
FEBRUARY 23
26°C / 27°C
light rainhumidity: 83% | wind: 10 km/h
FEBRUARY 24
26°C / 27°C
moderate rainhumidity: 79% | wind: 9 km/h
FEBRUARY 25
26°C / 27°C
light rainhumidity: 77% | wind: 6 km/h
FEBRUARY 26
26°C / 26°C
light rainhumidity: 81% | wind: 7 km/h
Sea Temperature in the Gulf of Thailand in Koh Samui: General Trends and Swimming Opportunities
Surat Thani province, situated on the eastern coastline of southern Thailand, experiences a tropical monsoon climate. Characterized by high temperatures year-round, the region has three seasons: the warm season from February to May, the rainy season from late May to December, and a cooler period from December to February.
Koh Samui is located in Asia in the Northern Hemisphere at a latitude of 10 degrees, along the shores of the Gulf of Thailand. Koh Samui lies within the Surat Thani province in Thailand.
The average annual daytime air temperature in Koh Samui is 32°C (90°F), with the average nighttime temperature being 23°C (73°F). The highest average daily temperature occurs in April, reaching 34°C (94°F), while the lowest is in December at 30°C (86°F). As for nighttime temperatures, the minimum average temperature of 22°C (72°F) is recorded in February, and the maximum is in April, reaching 24°C (75°F).
According to historical data, Koh Samui experiences 182 rainy days per year, which accounts for 50 percent of all days in the year. On average, there are 15 rainy days each month. The wettest month is October, with 22 rainy days and 269 mm (10.6 inches) of precipitation, while the driest month is February, which typically has 5 rainy days and only 50 mm (2.0 inches) of precipitation.
The average annual water temperature in Gulf of Thailand in Koh Samui is 30°C (86°F). In January, the water reaches its lowest point of the year at 26°C (79°F), while in April, it peaks at 33°C (91°F). The water temperature in the Gulf of Thailand in Koh Samui is comfortable for beach vacations and swimming year-round.
Geographical Location of Koh Samui
Nearby Cities
Frequently Asked Questions About Koh Samui and its Water Temperatures
What is the current sea temperature in Koh Samui?
The water temperature today in the Gulf of Thailand in Koh Samui is 84°F (29°C).
In which months is the water temperature in Koh Samui comfortable for swimming?
The water temperature in Koh Samui is comfortable for beach vacations and swimming throughout the year.
What is the water temperature in Koh Samui during the winter?
The water temperature in the Gulf of Thailand in Koh Samui during the winter ranges from 26°C to 30°C (79°F to 86°F).
What is the water temperature in Koh Samui during the spring?
The water temperature in the Gulf of Thailand in Koh Samui during the spring ranges from 27°C to 33°C (81°F to 91°F).
What is the water temperature in Koh Samui during the summer?
The water temperature in the Gulf of Thailand in Koh Samui during the summer ranges from 28°C to 32°C (82°F to 90°F).
What is the water temperature in Koh Samui during the fall?
The water temperature in the Gulf of Thailand in Koh Samui during the fall ranges from 27°C to 32°C (81°F to 90°F).
Is it possible to swim in the sea in Koh Samui year-round?
Yes, it is possible to swim in the Gulf of Thailand in Koh Samui year-round because the water temperature never drops below 26°C (79°F)
Is Koh Samui a popular tourist destination for beach vacations?
Koh Samui a fairly popular beach destination, offering good conditions for swimming and relaxation, with a steady flow of tourists, especially during peak seasons.
What sea temperatures can I expect in Koh Samui in the next month?
In March, the water temperature in the Gulf of Thailand in Koh Samui will range between 81°F (27°C) and 90°F (32°C)