Lamai Beach Weather in July

With daytime temperatures of 30°C (86°F) and nighttime lows of 27°C (81°F), July in Lamai Beach brings very high temperatures during the day. Do keep in mind that quite a bit of rainfall is typical. Around 92 mm (3.6 in) falls on average.

Rainfall in Lamai Beach in July

On average, there are about 17 days with rain during this month, averaging 92 mm (3.6 in). Expect a fairly normal spread of rainfall this month, with no particular pattern of very heavy or very persistent showers.

Temperature in Lamai Beach in July

In July, expect very high temperatures in Lamai Beach, with highs of 30°C (86°F) and lows of 27°C (81°F) at night. For most visitors, the main thing to prepare for is the heat during the day. Nights are warm at 27°C (81°F), which can make sleeping uncomfortable. Keeping windows open or using a fan can help. A cold shower before bed is also a good way to cool down.

Sunshine in Lamai Beach in July

You can expect a moderate amount of sunlight, with approximately 156 hours. This means a pleasant mix of sun and overcast.

Average water temperature in July

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.

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

Lamai Beach 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 92 mm (3.6 in)  

Rainy days 17 days  

Humidity 78% *  

Sunshine 156 hours *  

Percentage Sunshine *  

* Data from: Koh Samui, Thailand (14 KM, 8 Miles).

Daily Historical Temperatures

49-year average (1976-2025)

Based on our historical records, temperatures in Lamai Beach typically stay consistent throughout July, with daily highs averaging around 30°C (86°F). Nights are warm, with lows around 26°C (79°F).

Average temperatures in July

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Daily Historical Precipitation

49-year average (1976-2025)

Average daily rainfall for each day of the month based on long-term records.

Average precipitation in July

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Historical weather for Lamai Beach in July

Browse day-by-day weather records for Lamai Beach spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.

Historical weather Temperatures Precipitation

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Lamai Beach historical weather extremes in July

Based on 43 years of weather observations in Lamai Beach between 1982 and 2025, these are the recorded extremes.

• Lamai Beach recorded its highest July temperature of 39°C (102°F) on July 31, 2010.
• On July 23, 1999, Lamai Beach saw its coldest July day with temperatures maxing out at 27°C (81°F).
• Lamai Beach registered its coldest July night on July 11, 2010, with temperatures dropping to 20°C (68°F).

What to Wear in Lamai Beach in July

Warm weather calls for comfortable, breathable clothing in July. Cotton t-shirts, shorts, light dresses, and sandals are perfect. You might still want a light layer for evenings or air-conditioned places (for example buses). High rain levels are expected, so pack waterproof gear and an umbrella or poncho. 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 Lamai Beach 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 Lamai Beach's climate page.

More climate data for Lamai Beach

Temperature Rainfall Sunshine Humidity Water Temp

See the full Lamai Beach climate overview or explore weather in Thailand.