June weather forecast
Ko Samui, Thailand

June's weather in Ko Samui, Thailand, fluctuates noticeably from May. A decrease in rain from 156mm (6.14") to 124mm (4.88") means that showers are still frequent but not as heavy. The temperature peaks to its highest, which blends with unique summer rainfall. This is a month where the weather is hot, rainy yet inviting for visitors. June's sea temperature also remains steady compared to May.

Temperature

With the transition into June, Ko Samui notes an average high-temperature of a still tropical 32.2°C (90°F), closely resembling May. Throughout June, the average low-temperature in Ko Samui dips to a moderately hot 25.5°C (77.9°F).

Heat index

The heat index value during June is computed to be a scorching 44°C (111.2°F). Forewarned: Heat cramps and heat exhaustion are anticipated. Ongoing physical activity increases the likelihood of heatstroke.
Heat index evaluations are typically in the context of light winds and shaded environments. Heat index values have the potential to be boosted by 15 Fahrenheit (8 Celsius) degrees due to direct sunlight.
Note: The heat index, also known as 'felt air temperature' or 'feels like', combines air temperature and relative humidity to represent a human perceived temperature equivalent. Factors such as metabolic variation, pregnancy, and physical activity play a role in one's impression of weather. You should know that direct sun exposure can heighten weather effects, potentially elevating the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly relevant to babies and toddlers. In general, younger individuals are at greater risk than adults because they tend to sweat less. Also, having a larger skin surface to body size ratio and greater heat production due to their active behavior contribute to this danger.
When temperatures rise, the human body turns to perspiration, using the cooling power of evaporating sweat. When the air contains significant moisture, the efficiency of the evaporation process decreases, preventing the body from cooling down effectively and creating a feeling 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

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

Rainfall

In Ko Samui, in June, during 15 rainfall days, 124mm (4.88") of precipitation is typically accumulated. In Ko Samui, during the entire year, the rain falls for 160 days and collects up to 1960mm (77.17") of precipitation.

Sea temperature

In Ko Samui, the average seawater temperature in June is 29.8°C (85.6°F).
Note: Swimming, diving, and other water-related activities in temperatures between 25°C (77°F) and 29°C (84.2°F) are considered highly enjoyable and satisfying for longer durations without uneasiness.

Daylight

June has the longest days of the year, with an average of 12h and 42min of daylight.
On the first day of the month, sunrise is at 05:58 and sunset at 18:37. On the last day of June, sunrise is at 06:03 and sunset at 18:43 +07.

Sunshine

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

UV index

The months with the highest UV index are February through October, with an average maximum UV index of 12. A UV Index value of 11, and more, symbolizes an ultimate health vulnerability from exposure to the Sun's UV radiation for the average person.
Note: A daily high UV index of 12 in June leads to these guidelines:
Implement every essential safety step. Individuals with fair skin might receive burns in less than 5 minutes. During the period from 10 a.m. to 4 p.m., UV radiation is highest. Try to avoid direct sunlight during these hours. Loose clothes with a tight weave are optimal for safeguarding yourself against the Sun's rays. Even on overcast days, a sunscreen with a sun protection factor of no less than 30 should be generously applied and reapplied, particularly after swimming or outdoor activities. Take warning! Reflective sand and water surfaces intensify the Sun's UV rays.