ThailandThe weather in December in Ko Samui
It's hot in December in Ko Samui with an average temperature of 31°C. Temperatures this month range from a low of 30°C to a high of 32°C. At night, you can expect temperatures between 25°C and 26°C.
Looking for sun? December isn’t a good month to be in Ko Samui. The temperature is nice, but there’s too much chance of rain.
Average temperatures and precipitation
This chart shows the average daily maximum and minimum temperatures (in degrees Celsius) and precipitation (in millimeters) in December for Ko Samui, Thailand. A low precipitation value usually indicates little to no rainfall on that day in recent years, while a higher value suggests more frequent rainfall.
Temperature records
With 34°C in 2023, Ko Samui reached the highest temperature in December over the past 10 years. The lowest daytime temperature in this month was 26°C in 2015. The extreme nighttime temperatures ranged from a lowest recorded value of 21°C to a highest value of 28°C.
Water temperature
The water temperature at Ko Samui is 30°C this month. It’s really warm, perfect for a swim.
Rainfall amount
In December, there is an average of 361 mm of precipitation, spread over 25 days. The wind speed is around 4 Bft, mostly coming from the East.
Daily weather in December for Ko Samui
Click on any day in December to get detailed info about the usual weather on that day in Ko Samui. Check out the historical temperatures and precipitation over the past 10 years on this day.
December weather comparison
| Ko Samui | New York | |
|---|---|---|
| Average temperature | 31°C | 9°C |
| Max. temperature | 32°C | 12°C |
| Min. temperature | 25°C | -5°C |
| Total precipitation | 361 mm | 133 mm |
| Rainy days | 25 days | 17 days |
Start of December
The month of December starts in Ko Samui with hot temps, averaging around 31°C during the day and nights around 26°C.
Mid December
By mid-December, daytime temps rise to around 32°C, with nights around 26°C. There’s a high chance of precipitation during this time.
End of December
By the end of December, the average daytime temperature in Ko Samui is around 31°C, while nighttime temps are about 26°C. There’s a significant chance of many days with precipitation.
UV index
The UV index is a maximum of 8 this month. That's a very high value on the intensity scale of 1 to 11. Unprotected skin can burn within 10-15 minutes.
The typhoon season in Ko Samui runs from June to November.
Check out the climate of Ko Samui for all months and discover the best travel time
Curious about the weather in other parts of Thailand? Check out the climate and weather for spots like Bangkok, Chiang Mai, Phuket, or explore other destinations in Thailand.
Temperature charts
These charts show the average temperatures in December in Ko Samui, Thailand. The temperatures are shown in degrees Celsius and are calculated based on data from the past 10 years.
Daily Temperature in December in Ko Samui
Temperature in December in Ko Samui over the years
Precipitation charts
These charts show the average amount of precipitation in December in Ko Samui, Thailand. Precipitation is always measured as water, even when it falls as snow or hail The amount of precipitation is displayed in millimeters, while snowfall is shown in centimeters.
Daily Precipitation in December in Ko Samui
Total precipitation in December in Ko Samui over the years
Daily UV index in December in Ko Samui
This chart shows the average daily UV index in December in Ko Samui, with the UV index ranging from 0 to a maximum of 11. The bottom of the chart shows the days of the month. Based on historical data, this chart provides an idea of the daily UV radiation levels you can expect.
Weather experiences in December in Ko Samui
Have you been to Ko Samui in December?
Share your weather experience in December in Ko Samui.
Average weather in Ko Samui by month
Click on a month below to see detailed weather info for Ko Samui. Based on historical weather data, you can see the average temperature, precipitation, wind, and UV index for each day of the month.