Ko Samui Weather in December

In Ko Samui, December brings high daytime temperatures around 29°C (84°F), with nights cooling to 26°C (79°F). Expect quite a bit of rainfall this month.

Rainfall in Ko Samui in December

Typically, you can expect about 14 days of rain this month, with 170 mm (6.7 in) on average. Individual showers can be quite heavy this month. A proper umbrella or rain jacket is worth having.

Temperature in Ko Samui in December

In December, expect high temperatures in Ko Samui, with highs of 29°C (84°F) and lows of 26°C (79°F) at night. This kind of day-to-night contrast is typical for this time of year. With lows of 26°C (79°F), it stays warm throughout the night. A cold shower before going to sleep is one of the easiest ways to cool down before bed.

Sunshine in Ko Samui in December

The month brings about 177 hours of sunlight, offering a comfortable mix of sun and overcast.

Average water temperature in December

With water at 29°C (84°F), conditions are warm and calm. Perfect for those who like tropical water temperatures, though it won't cool you down much.

Should you favor a climate that's both dry and comfortably warm, January and February typically offer the most agreeable circumstances. If you're seeking pleasant, dry and sunny weather somewhere else in the world, our weather planner can help you explore other options.

Select a Month

Check the conditions for any month of the year.

• January
• February
• March
• April

• May
• June
• July
• August

• September
• October
• November
• December

For a detailed overview over the year and the best time to visit Thailand, check out our Ko Samui's climate page.

Ko Samui Temperature in December

Min Temperature 26°C (79°F)  

Max Temperature 29°C (84°F)  

Water Temperature 29°C (84°F) *  

Chance of Rain 48%  

Precipitation 170 mm (6.7 in)  

Rainy days 14 days  

Humidity 82% *  

Sunshine 177 hours *  

Percentage Sunshine *  

* Data from: Koh Samui, Thailand (19 KM, 12 Miles).

What to Wear in Ko Samui in December

Warm but pleasant conditions in Ko Samui in December. Focus on lightweight, maybe with natural fabrics, cotton blend shirts, comfortable shorts, and breathable footwear. A light cover-up for sun protection is smart too. It's going to pour! Pack a good poncho and prepare for very wet conditions. With water temperatures around 29°C (84°F), swimming conditions are excellent. Pack your swimsuit, goggles, and maybe some water shoes. Sunglasses could come in handy during the sunnier parts of your trip.

What To Do in Ko Samui in December

We rated the following activities from 1 (least suitable) to 10 (best) to do.

Swimming

7/10

Cycling

7/10

Walking

7/10

Camping

7/10

Outdoor sports

7/10

Select a Month

Check the conditions for any month of the year.

• January
• February
• March
• April

• May
• June
• July
• August

• September
• October
• November
• December

For a detailed overview over the year and the best time to visit Thailand, check out our Ko Samui's climate page.

More climate data for Ko Samui

Temperature Rainfall Sunshine Humidity Water Temp

See the full Ko Samui climate overview or explore weather in Thailand.