Koh Samui Weather in July

Thinking of visiting Koh Samui in July? Expect very high temperatures reaching 30°C (86°F) during the day, dropping to 27°C (81°F) at night, and note that quite a bit of rainfall is likely.

Rainfall in Koh Samui in July

Typically around 17 days of rainfall are expected, averaging 93 mm (3.7 in) for the month. Neither particularly heavy nor particularly frequent, the rain this month is about average. A light jacket should be enough on most wet days.

Temperature in Koh Samui in July

Daytime temperatures in Koh Samui reach 30°C (86°F) in July, dropping to 27°C (81°F) at night. For most visitors, the main thing to prepare for is the heat during 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 Koh Samui in July

With about 156 hours of sunshine, the area enjoys a nice balance of sun and overcast, creating a pleasant environment.

Average water temperature in July

At 29°C (84°F), the water is very warm — more like a heated pool than the sea. Great for those who like warm water, though some may find it less refreshing on a hot day.

For Koh Samui itself, January and February generally stand out with 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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Check the conditions for any month of the year.

• January
• February
• March
• April

• May
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• 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 July

Min Temperature 27°C (81°F)  

Max Temperature 30°C (86°F)  

Water Temperature 29°C (84°F) *  

Chance of Rain 55%  

Precipitation 93 mm (3.7 in)  

Rainy days 17 days  

Humidity 78% *  

Sunshine 156 hours *  

Percentage Sunshine *  

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

What to Wear in Koh Samui in July

Warm but pleasant conditions in Koh Samui in July. 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 29°C (84°F), swimming conditions are excellent. Pack your swimsuit, goggles, and maybe some water shoes. It won't hurt to bring your sunglasses along, as you'll see some sunny periods.

What To Do in Koh Samui in July

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.