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

April 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
April, like March, is a hot spring month in Ko Samui, Thailand, with average temperature varying between 26.1°C (79°F) and 32.6°C (90.7°F).

Temperature

The warmest month is April, with an average high-temperature of 32.6°C (90.7°F) and an average low-temperature of 26.1°C (79°F).

Heat index

In April, the average heat index is appraised at a blazing hot 47.1°C (116.8°F). Be wary - heat exhaustion and heat cramps are highly anticipated. With continued activity, heatstroke is very likely.
Note that heat index values are valued for light wind and location in the shade. Exposure to direct sunshine can increase heat index values by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel', 'felt air temperature', 'feels like', or 'apparent temperature', is an index that combines air temperature and relative humidity to determine the human-perceived temperature equivalent. Additional factors like activity, pregnancy, wind, and metabolic differences affect individual temperature impact. Bear in mind that direct sunshine exposure increases weather impact, and may raise heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially crucial for babies and toddlers. Children are often less aware of the need to rest and re-hydrate. Thirst is a late sign of dehydration - it is vital to remain hydrated, particularly during prolonged physical activities.
Perspiration is the human body's physiological response to high temperatures and is an attempt to lower body temperature through evaporation of sweat. Under high air temperature and humidity (high heat index) conditions, perspiration is limited, and the perception of heat is increased. 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

In Ko Samui, the average relative humidity in April is 81%.

Rainfall

In April, in Ko Samui, the rain falls for 8 days. Throughout April, 83.1mm (3.3") of precipitation is accumulated. Throughout the year, in Ko Samui, there are 160 rainfall days, and 1960.1mm (77.2") of precipitation is accumulated.

Sea temperature

In Ko Samui, the average seawater temperature in April is 29.8°C (85.6°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

In April, the average length of the day is 12.3h.

Sunshine

In Ko Samui, the average sunshine is 8h.

UV index

Months with the highest UV index are February through October, with an average maximum UV index of 12. A UV Index estimate of 11, and higher, represents an extreme threat to health from unprotected exposure to the Sun's UV rays for the ordinary person.
Note: The average daily UV index of 12 transform into the following instructions:
Practice all essential precautions. Protection against sun damage is crucial. The Sun's UV radiation is most powerful between 10 a.m. and 4 p.m. To the extent possible, limit exposure to the direct sun during these hours. A wide-brim hat offers excellent sun protection for eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun. 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 warmest month in Ko Samui?

With an average high-temperature of 32.6°C (90.7°F) and an average low-temperature of 26.1°C (79°F), April is the warmest month.

What is the temperature in April in Ko Samui?

In April, in Ko Samui, the average high-temperature is 32.6°C (90.7°F), and the average low-temperature is 26.1°C (79°F). In April, the average heat index (a.k.a. 'felt air temperature', 'real feel'), that combines both air temperature and relative humidity, is calculated to 47.1°C (116.8°F).

What is the average humidity in April in Ko Samui?

In April, the average relative humidity in Ko Samui is 81%.

How much does it rain in Ko Samui in April?

In Ko Samui, during April, the rain falls for 8 days and regularly aggregates up to 83.1mm (3.3") of precipitation.

What is the sea water temperature in April in Ko Samui?

In April, the average sea temperature in Ko Samui is 29.8°C (85.6°F). For swimming, diving, and other water activities, temperatures between 25°C (77°F) and 29°C (84.2°F) are perceived as very enjoyable and pleasurable for prolonged periods without feeling uncomfortable.

How many hours of daylight does Ko Samui have in April?

In Ko Samui, Thailand, the average length of the day in April is 12.3h.

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

The average sunshine in April is 8h.

What is the month with the highest UV index in Ko Samui?

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

What is the UV index intensity in April in Ko Samui?

In Ko Samui, Thailand, the average daily maximum UV index in April is 12. A UV Index reading of 11, and higher, represents an excessive health risk from unprotected exposure to the UV radiation.
Average temperature in April - Ko Samui, Thailand
  • Average high temperature in April: 32.6°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 April: 26.1°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 April - Ko Samui, Thailand
  • Average humidity in April: 81%

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 April - Ko Samui, Thailand
  • Average rainfall in April: 83.1mm

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 April - Ko Samui, Thailand
  • Average rainfall days in April: 8 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 April - Ko Samui, Thailand
  • Average sea temperature in April: 29.8°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 April / Average sunshine in April - Ko Samui, Thailand
  • Average daylight in April: 12.3h

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 April: 8h

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 April - Ko Samui, Thailand
  • Average UV index in April: 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).