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

July 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
July, like June, is another tropical summer month in Ko Samui, Thailand, with temperature in the range of an average low of 25.2°C (77.4°F) and an average high of 32.1°C (89.8°F).

Temperature

In Ko Samui, the average high-temperature is relatively the same as in June - a still tropical 32.1°C (89.8°F). In July, the average low-temperature is 25.2°C (77.4°F).

Heat index

In July, the average heat index is evaluated at a blistering 43.9°C (111°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 'feels like', 'real feel', 'felt air temperature', or 'apparent temperature', is a measure of how hot it feels when the actual air humidity is factored in. Additional factors like activity, pregnancy, differences in body mass, height, and shape, and clothing affect individual temperature impact. 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 especially crucial for babies and toddlers. 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.
Perspiration is the human body's physiological response to high temperatures and is an attempt to lower body temperature through 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. 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

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

Rainfall

In Ko Samui, in July, during 15 rainfall days, 116.3mm (4.6") of precipitation is typically accumulated. In Ko Samui, during the entire year, the rain falls for 160 days and collects up to 1960.1mm (77.2") of precipitation.

Sea temperature

In July, the average sea 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

The average length of the day is 12.6h.

Sunshine

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

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 excessive health risk from the exposure to the Sun's UV rays for average individuals.
Note: The average daily UV index of 12 transform into the following instructions:
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. 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 July in Ko Samui?

The average high-temperature, in July, is 32.1°C (89.8°F), while the average low-temperature is 25.2°C (77.4°F). In July, the average heat index (a.k.a. 'felt air temperature', 'real feel'), that calculates temperature value influenced by the moisture in the air, is calculated to 43.9°C (111°F).

What is the least humid month in Ko Samui?

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

What is the average humidity in July in Ko Samui?

The average relative humidity in July is 78%.

How much does it rain in Ko Samui in July?

In Ko Samui, Thailand, in July, it is raining for 15 days, with typically 116.3mm (4.6") of accumulated precipitation.

How warm is the water in July in Ko Samui?

In Ko Samui, in July, the average water temperature 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 July?

The average length of the day in July in Ko Samui, Thailand, is 12.6h.

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 July in Ko Samui?

In July, the average sunshine in Ko Samui, Thailand, 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 intensity in July in Ko Samui?

In July, the average daily maximum UV index in Ko Samui is 12. A UV Index reading of 11, and higher, represents an extreme health vulnerability from the exposure to the Sun's UV rays.
Average temperature in July - Ko Samui, Thailand
  • Average high temperature in July: 32.1°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 July: 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 July - Ko Samui, Thailand
  • Average humidity in July: 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 July - Ko Samui, Thailand
  • Average rainfall in July: 116.3mm

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 July - Ko Samui, Thailand
  • Average rainfall days in July: 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 July - Ko Samui, Thailand
  • Average sea temperature in July: 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 July / Average sunshine in July - Ko Samui, Thailand
  • Average daylight in July: 12.6h

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