Ko Samui Weather in August

August in Ko Samui brings very high temperatures, with highs of 30°C (86°F) and nights dropping to 27°C (81°F). Rainfall is on the higher side this month, averaging around 90 mm (3.5 in), so keep a rain jacket handy.

Rainfall in Ko Samui in August

On average, there are about 16 days with rain during this month, averaging 90 mm (3.5 in). Expect a fairly normal spread of rainfall this month, with no particular pattern of very heavy or very persistent showers.

Temperature in Ko Samui in August

In August, Ko Samui gets very high temperatures, with highs of 30°C (86°F). Nights cool to around 27°C (81°F). It's usually most comfortable outside during the morning and later in the day. With overnight lows of 27°C (81°F), nights stay very warm. Air conditioning makes a real difference if you're sensitive to heat. A cold shower before bed can also help you get to sleep more comfortably.

Sunshine in Ko Samui in August

The area experiences a moderate amount of sunshine, with approximately 152 hours of sunlight expected. This means a decent mix of sun and overcast.

Average water temperature in August

At 29°C (84°F), the water feels bath-warm. Fine for swimming, but those looking for a cooling swim may be a bit disappointed.

If you prefer enjoying temperate temperatures and rain-free days, January and February typically offer the best circumstances. If you're seeking pleasant, dry and sunny weather somewhere else in the world, our weather planner can help you explore other options.

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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 August

Min Temperature 27°C (81°F)  

Max Temperature 30°C (86°F)  

Water Temperature 29°C (84°F) *  

Chance of Rain 55%  

Precipitation 90 mm (3.5 in)  

Rainy days 16 days  

Humidity 78% *  

Sunshine 152 hours *  

Percentage Sunshine *  

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

What to Wear in Ko Samui in August

Warm but pleasant conditions in Ko Samui in August. 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 29°C (84°F), making it perfect for swimming and water activities. Don't forget to pack your favorite swimwear and perhaps some snorkel gear. It won't hurt to bring your sunglasses along, as you'll see some sunny periods.

What To Do in Ko Samui in August

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.