Koh Samui Weather in January

January in Koh Samui brings high temperatures, with daytime highs of 28°C (82°F) and nights around 26°C (79°F). Quite a bit of rainfall is expected, around 82 mm (3.2 in), so pack an umbrella.

Rainfall in Koh Samui in January

Records from the past 30 years suggest around 9 days of rain, with 82 mm (3.2 in) average for the month. Individual showers can be quite heavy this month. A proper umbrella or rain jacket is worth having.

Temperature in Koh Samui in January

If you're visiting Koh Samui in January, expect perfect temperatures with highs of 28°C (82°F) and overnight lows of 26°C (79°F). The days can feel warmer than the evenings, so packing for both parts of the day is a good idea. At 26°C (79°F) overnight, it stays warm after dark. Light, breathable clothing and good airflow in your room make a noticeable difference.

Sunshine in Koh Samui in January

Expect a lot of sunshine this month, with about 200 hours of sun. These sunny conditions add to the overall experience.

Average water temperature in January

The water is 27°C (81°F) this month — warm enough that getting in requires no effort at all. Good conditions for swimming, snorkeling, or just floating around.

So this is a great month to visit if you prefer dry days with pleasant temperatures.

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 Koh Samui's climate page.

Koh Samui Temperature in January

Min Temperature 26°C (79°F)  

Max Temperature 28°C (82°F)  

Water Temperature 27°C (81°F) *  

Chance of Rain 31%  

Precipitation 82 mm (3.2 in)  

Rainy days 9 days  

Humidity 83% *  

Sunshine 200 hours *  

Percentage Sunshine *  

* Data from: Koh Samui, Thailand (8 KM, 5 Miles).

What to Wear in Koh Samui in January

Warm but pleasant conditions in Koh Samui in January. 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. Expect heavy rainfall, so bring good rain protection and waterproof bags. With water temperatures around 27°C (81°F), swimming conditions are excellent. Pack your swimsuit, goggles, and maybe some water shoes. You'll definitely want to pack sunglasses and sunscreen. There will be plenty of bright sunshine this month.

What To Do in Koh Samui in January

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 Koh Samui's climate page.

More climate data for Koh Samui

Temperature Rainfall Sunshine Humidity Water Temp

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