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

June 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
June, the first month of the summer, in Ko Samui, is still a tropical month, with average temperature varying between 32.2°C (90°F) and 25.5°C (77.9°F).

Temperature

In Ko Samui, the average high-temperature is almost the same as in May - a still tropical 32.2°C (90°F). In June, in Ko Samui, the average low-temperature is 25.5°C (77.9°F).

Heat index

In June, the average heat index is appraised at a scorching 44.2°C (111.6°F). Beware - heat cramps and heat exhaustion are very likely. Heatstroke is imminent with prolonged activity.
Note that heat index values are valued for light wind and location in the shade. 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 'apparent temperature', 'feels like', 'felt air temperature', or 'real feel', combines air temperature and relative humidity to represent a human perceived temperature equivalent. This effect is subjective, depending on the activity and individual's heat perception influenced by various reasons (wind, pregnancy, differences in body mass, height, and shape). 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.
The human body normally cools itself by perspiration. Excessive warmth is eliminated from the body by evaporation of sweat. High relative humidity reduces the evaporation rate, resulting in a lower heat removal rate from the body, causing the perception of being overheated. When heat gain exceeds the level the body can remove, body temperature begins to rise, and heat-related illnesses and disorders may develop.

Humidity

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

Rainfall

In June, in Ko Samui, Thailand, the rain falls for 15 days. Throughout June, 124.1mm (4.9") of precipitation is accumulated. Throughout the year, in Ko Samui, Thailand, there are 160 rainfall days, and 1960.1mm (77.2") of precipitation is accumulated.

Sea temperature

In Ko Samui, Thailand, in June, the average water temperature is 29.8°C (85.6°F).
Note: 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.

Daylight

June has the longest days of the year, with an average of 12.7h of daylight.

Sunshine

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

UV index

Months with the highest UV index in Ko Samui are February through October, with an average maximum UV index of 12. A UV Index of 11, and more, symbolizes an excessive health risk from unprotected exposure to the Sun's UV rays for the average person.
Note: In June, the average maximum UV index of 12 translate into the following recommendations:
Take all necessary precautions, as unprotected skin can burn in minutes. 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. 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 strength of the UV rays is significantly increased by the reflection of the water and sand.

What is the temperature in June in Ko Samui?

In Ko Samui, in June, the average high-temperature is 32.2°C (90°F), and the average low-temperature is 25.5°C (77.9°F). The average heat index (a.k.a. 'apparent temperature', 'real feel'), that represents influence of the relative humidity to air temperaure, in June is estimated at 44.2°C (111.6°F).

What is the least humid month in Ko Samui?

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

What is the average humidity in June in Ko Samui?

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

How much does it rain in Ko Samui in June?

In Ko Samui, Thailand, in June, during 15 rainfall days, 124.1mm (4.9") of precipitation is typically accumulated.

What is the water temperature in June in Ko Samui?

In Ko Samui, in June, the average water temperature is 29.8°C (85.6°F). 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.

When are the longest days in Ko Samui?

June has the longest days of the year in Ko Samui, with an average of 12.7h of daylight.

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

In Ko Samui, the average length of the day in June is 12.7h.

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, Thailand.

How long on average sun shines in June in Ko Samui?

In June, the average sunshine is 6h.

What are the months with the highest UV index in Ko Samui?

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

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

The average daily maximum UV index in June in Ko Samui is 12. A UV Index estimate of 11, and higher, represents an extreme health threat from the exposure to the Sun's UV radiation.
Average temperature in June - Ko Samui, Thailand
  • Average high temperature in June: 32.2°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 June: 25.5°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 June - Ko Samui, Thailand
  • Average humidity in June: 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 June - Ko Samui, Thailand
  • Average rainfall in June: 124.1mm

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 June - Ko Samui, Thailand
  • Average rainfall days in June: 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 June - Ko Samui, Thailand
  • Average sea temperature in June: 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 June / Average sunshine in June - Ko Samui, Thailand
  • Average daylight in June: 12.7h

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