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

March 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
March, the first month of the spring, in Ko Samui, is a tropical month, with average temperature varying between 25.6°C (78.1°F) and 30.6°C (87.1°F).
An excellent water temperature of 28.8°C (83.8°F) and only 4 rainfall days, with 80.8mm (3.2") of accumulated rainfall, makes March a prime for swimming and other water activities.

Temperature

In March, the average high-temperature is practically the same as in February - a tropical 30.6°C (87.1°F). In Ko Samui, the average low-temperature is 25.6°C (78.1°F).

Heat index

The average heat index is calculated to a scorching 40.2°C (104.4°F). Take special precautions - heat exhaustion and heat cramps are expected. Heatstroke may occur with lengthy activity.
Take into consideration that the heat index values are calculated for shade and light wind conditions. Exposure to direct sunshine can increase heat index values by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like', 'felt air temperature', 'real feel', 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. This effect is individual, with diverse people perceiving weather differently for numerous reasons (clothing, pregnancy, wind), and activity. 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 normally cools itself by perspiration. Excessive warmth is eliminated from the body by evaporation of sweat. Under high air temperature and humidity (high heat index) conditions, perspiration is limited, and the perception of heat is increased. If the body can not disperse the excessive heat and body temperature reaches conditions of hyperthermia, above 37.5°C (99.5°F) to 38.3°C (100.9°F), thermal conditions are potentially life-threatening.

Humidity

The average relative humidity in March is 82%.

Rainfall

In Ko Samui, during 4 rainfall days, 80.8mm (3.2") 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 water temperature is 28.8°C (83.8°F).
Note: Water temperature between 25°C (77°F) and 29°C (84.2°F) is regarded as very warm and enjoyable by all. With these temperatures, water activities are pleasurable, without feeling uncomfortable for prolonged periods.

Daylight

In March, the average length of the day in Ko Samui is 12.1h.

Sunshine

The average sunshine in March is 8h.

UV index

February through October, with an average maximum UV index of 12, are months with the highest UV index in Ko Samui. A UV Index reading of 11, and higher, represents an extreme health hazard from unsafe exposure to the UV radiation for the average person.
Note: In March, the average maximum UV index of 12 translate into the following recommendations:
Take all required precautions, as unprotected skin and eyes can burn in 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. A broad-spectrum sunscreen of SPF 30+ should be liberally applied and re-applied every two hours, and immediately after an outdoor workout or a swim. Beware! The reflection of water and sand dramatically increases exposure to the UV rays.

What is the temperature in March in Ko Samui?

In Ko Samui, Thailand, in March, the average high-temperature is 30.6°C (87.1°F), and the average low-temperature is 25.6°C (78.1°F). The average heat index (a.k.a. 'apparent temperature', 'real feel'), that takes the relative humidity and factores it into the air temperature reading, in March is evaluated at 40.2°C (104.4°F).

What is the average humidity in March in Ko Samui?

In March, the average relative humidity in Ko Samui is 82%.

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

In March, in Ko Samui, the rain falls for 4 days. Throughout March, 80.8mm (3.2") of precipitation is accumulated.

How warm is the water in March in Ko Samui?

In March, the average sea temperature in Ko Samui, Thailand, is 28.8°C (83.8°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 March?

The average length of the day in March in Ko Samui, Thailand, is 12.1h.

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

In March, the average sunshine in Ko Samui, Thailand, 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.

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

The average daily maximum UV index in March is 12. A UV Index estimate of 11, and higher, represents an ultimate hazard to health from the exposure to the Sun's UV rays.
Average temperature in March - Ko Samui, Thailand
  • Average high temperature in March: 30.6°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 March: 25.6°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 March - Ko Samui, Thailand
  • Average humidity in March: 82%

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 March - Ko Samui, Thailand
  • Average rainfall in March: 80.8mm

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 March - Ko Samui, Thailand
  • Average rainfall days in March: 4 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 March - Ko Samui, Thailand
  • Average sea temperature in March: 28.8°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 March / Average sunshine in March - Ko Samui, Thailand
  • Average daylight in March: 12.1h

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