Ko Samui Weather in January

January in Ko Samui typically sees daytime highs of 29°C (84°F) and nighttime lows of 26°C (79°F). Rainfall is also possible this month, so it's worth packing an umbrella.

Rainfall in Ko Samui in January

This month experiences about 10 days of rain according to historical data, averaging 89 mm (3.5 in). Rainfall intensity is on the higher side this month. Expect more substantial showers rather than light, passing rain.

Temperature in Ko Samui in January

If you're visiting Ko Samui in January, expect perfect temperatures with highs of 29°C (84°F) and overnight lows of 26°C (79°F). This gives the month a fairly typical daily rhythm, with warmer afternoons and more comfortable nights. 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 Ko Samui in January

The city usually sees around 200 hours of sunlight, indicating many sunny days — a great month for sightseeing.

Average water temperature in January

With water at 27°C (81°F), you can expect warm, pleasant conditions for any water activity. There's no adjustment period — it feels comfortable straight away.

If you're a fan of comfortable temperatures and drier conditions, January is a great time to visit.

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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 January

Min Temperature 26°C (79°F)  

Max Temperature 29°C (84°F)  

Water Temperature 27°C (81°F) *  

Chance of Rain 32%  

Precipitation 89 mm (3.5 in)  

Rainy days 10 days  

Humidity 83% *  

Sunshine 200 hours *  

Percentage Sunshine *  

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

What to Wear in Ko Samui in January

Warm but pleasant conditions in Ko 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. The water temperature sits at about 27°C (81°F), making it perfect for swimming and water activities. Don't forget to pack your favorite swimwear and perhaps some snorkel gear. You'll definitely want to pack sunglasses and sunscreen. There will be plenty of bright sunshine this month.

What To Do in Ko 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 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.