Ko Samui
Thailand
Long-term weather forecast
Long-term weather forecast

August weather forecast and climate
Ko Samui, Thailand

The scenic view of the striking Angthong National Marine Park in Ko Samui, Thailand, calm clear water all around
The scenic view of the striking Angthong National Marine Park in Ko Samui, Thailand, calm clear water all around
The last month of the summer, August, is another tropical month in Ko Samui, Thailand, with average temperature fluctuating between 25.2°C (77.4°F) and 31.7°C (89.1°F).

Temperature

In August, the average high-temperature is practically the same as in July - a still hot 31.7°C (89.1°F). In Ko Samui, the average low-temperature is 25.2°C (77.4°F).

Heat index

In August, the average heat index is evaluated at an extremely hot 42.5°C (108.5°F). Be wary - heat exhaustion and heat cramps are highly anticipated. With continued activity, heatstroke is very likely.
Take into consideration that the heat index values are calculated for shade and light wind conditions. With the exposure to direct sunlight, the heat index may be increased by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like', 'real feel', 'felt air temperature', or 'apparent temperature', is a measure that combines both air temperature and relative humidity into a single value that indicates how hot the weather feels. Additional factors like pregnancy, wind, metabolic differences, and activity influence one's weather impression. Be aware that direct exposure to sunlight increases heat impact, and may raise the heat index additionally, by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly important for children. Young children are generally more endangered than adults, as they usually less sweat. And also, due to larger skin surface relative to their small bodies and higher heat production as a result of their activity.
The human body cools itself through perspiration, as excessive warmth is removed from the body through sweat evaporation. With a lot of moisture in the air, the evaporation process is not as effective, and the body does not cool down as efficiently, creating a perception of overheating. When heat gain surpasses the level the body can shed, body temperature begins to increase, and consequently, overheating and dehydration can occur, with varying severity.

Humidity

June through August, with an average relative humidity of 78%, are the least humid months.

Rainfall

In Ko Samui, during 15 rainfall days, 110.9mm (4.4") of precipitation is typically accumulated. Throughout the year, there are 160 rainfall days, and 1960.1mm (77.2") of precipitation is accumulated.

Sea temperature

In Ko Samui, the average seawater temperature in August is 29.2°C (84.6°F).
Note: For any water activity, surface water temperatures between 25°C (77°F) and 29°C (84.2°F) are considered as excellent and extremely pleasant for lengthened periods.

Daylight

The average length of the day in Ko Samui is 12.4h.

Sunshine

Months with the least sunshine are May through December, with an average of 6h of sunshine.

UV index

February through October, with an average maximum UV index of 12, are months with the highest UV index. A UV Index estimate of 11, and higher, represents an excessive health risk from the exposure to the Sun's UV radiation for average individuals.
Note: The daily maximum UV index of 12 interpret into the following advice:
Practice all-important precautions. Light skin people may get burned in less than 5 minutes. Seek shade and minimize exposure to direct Sun in a period between 10 a.m. and 4 p.m. when UV radiation is most intense; keep in mind that shade structures like parasols or canopies do not provide perfect sun protection. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects. Even on cloudy days, a sunscreen with a minimum 30 sun protection factor should be generously applied and frequently re-applied, including after every swim or outdoor exercise. Caution! The reflection of sand and water significantly increases the intensity of the Sun's UV radiation.

What is the temperature in August in Ko Samui?

In August, in Ko Samui, Thailand, the average high-temperature is 31.7°C (89.1°F), and the average low-temperature is 25.2°C (77.4°F). The average heat index (a.k.a. 'felt air temperature', 'apparent temperature'), that combines both air temperature and relative humidity, in August is calculated to 42.5°C (108.5°F).

What are the least humid months in Ko Samui?

Months with the lowest humidity are June through August, with an average relative humidity of 78%.

What is the average humidity in August in Ko Samui?

In Ko Samui, the average relative humidity in August is 78%.

How many days does it rain in August in Ko Samui?

In Ko Samui, Thailand, in August, during 15 rainfall days, 110.9mm (4.4") of precipitation is typically accumulated.

How warm is the water in August in Ko Samui?

In August, the average sea temperature in Ko Samui is 29.2°C (84.6°F). For any water activity, surface water temperatures between 25°C (77°F) and 29°C (84.2°F) are considered as excellent and extremely pleasant for lengthened periods.

What is the average length of the day in August in Ko Samui?

The average length of the day in August in Ko Samui is 12.4h.

What is the month with the least sunshine in Ko Samui?

May through December, with an average of 6h of sunshine, are months with the least sunshine in Ko Samui.

How many hours of sunshine does Ko Samui have in August?

In August, the average sunshine is 6h.

When is the highest UV index in Ko Samui?

Months with the highest UV index in Ko Samui, Thailand, are February through October, with an average maximum UV index of 12.

What is the UV index reading in August in Ko Samui?

In August, the average daily maximum UV index in Ko Samui, Thailand, is 12. A UV Index of 11, and more, symbolizes an extreme health threat from unprotected exposure to the UV radiation.
Average temperature in August - Ko Samui, Thailand
  • Average high temperature in August: 31.7°C

The warmest month (with the highest average high temperature) is April (32.6°C).
The month with the lowest average high temperature is January (29°C).

  • Average low temperature in August: 25.2°C

The month with the highest average low temperature is April (26.1°C).
The coldest month (with the lowest average low temperature) is December (23.9°C).

Average humidity in August - Ko Samui, Thailand
  • Average humidity in August: 78%

Months with the highest relative humidity are October and November (85%).
Months with the lowest relative humidity are June, July and August (78%).

Average rainfall in August - Ko Samui, Thailand
  • Average rainfall in August: 110.9mm

The wettest month (with the highest rainfall) is November (506.6mm).
The driest month (with the lowest rainfall) is February (54.4mm).

Average rainfall days in August - Ko Samui, Thailand
  • Average rainfall days in August: 15 days

Months with the highest number of rainy days are October and November (20 days).
The month with the lowest number of rainy days is March (4 days).

Average sea temperature in August - Ko Samui, Thailand
  • Average sea temperature in August: 29.2°C

The best month for swimming (with the highest average sea temperature) is May (30.1°C).
The coldest month (with the lowest average sea temperature) is January (27.8°C).

Average daylight in August / Average sunshine in August - Ko Samui, Thailand
  • Average daylight in August: 12.4h

The month with the longest days is June (Average daylight: 12.7h).
Months with shortest days are January and December (Average daylight: 11.6h).

  • Average sunshine in August: 6h

The month with most sunshine is February (Average sunshine: 9h).
Months with least sunshine are May, June, July, August, September, October, November and December (Average sunshine: 6).

Average UV index in August - Ko Samui, Thailand
  • Average UV index in August: 12

Months with the highest UV index are February, March, April, May, June, July, August, September and October (UV index 12).
The month with the lowest UV index is December (UV index 10).