April weather forecast
Ko Samui, Thailand

Weather in Ko Samui, Thailand, during April is characterized by a drastic increase in rainfall from 81mm (3.19") to 83mm (3.27") compared to March. This is a month where the region transitions into monsoon season. Despite the mounting rainfall, the number of sunny days remains unaffected, keeping the beach a popular attraction. April's weather provides visitors with a unique blend of sun and showers. Sea temperature rises adding a refreshing touch to the otherwise hot month.

Temperature

Ko Samui's April weather reaches an average high of 32.6°C (90.7°F) and an average low of 26.1°C (79°F), making it the warmest month.

Heat index

April's heat index is computed to be a life-threatening hot 47°C (116.6°F). Eyes open: Heat cramps and heat exhaustion are expected. Prolonged exertion could lead to heatstroke.
Data suggests that the heat index is set for environments in shade and with a light wind. The heat index may scale up by 15 Fahrenheit (8 Celsius) degrees with direct sun exposure.
Note: The heat index, also known as 'felt air temperature' or 'real feel', is a single figure representing how weather conditions feel when combining temperature and humidity. The influence of weather is personal, with varied individuals experiencing it differently due to differences in body mass, stature, and physical exertion levels. Direct sun rays have a notable impact on perceived temperature, which can raise the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values hold great significance to children. Typically, children face more danger than adults as they usually perspire less. Their larger skin surface relative to their small bodies and increased heat output from their activities enhance their risk.
The evaporation of sweat is a natural cooling mechanism of the human body, facilitated by perspiration. When relative humidity increases, the body's capacity to evaporate heat decreases, leading to a heightened sense of warmth. Overheating risks increase with rising body temperatures, especially if heat release isn't efficient.

Humidity

In April, the average relative humidity is 81%.

Rainfall

In Ko Samui, in April, it is raining for 8 days, with typically 83mm (3.27") of accumulated precipitation. In Ko Samui, Thailand, during the entire year, the rain falls for 160 days and collects up to 1960mm (77.17") of precipitation.

Sea temperature

In Ko Samui, Thailand, in April, the average water temperature is 29.8°C (85.6°F).
Note: For swimming, diving, and various water activities, the temperatures ranging from 25°C (77°F) to 29°C (84.2°F) are seen as highly enjoyable and comfortable for extended durations without any discomfort.

Daylight

In April, the average length of the day in Ko Samui is 12h and 20min.
On the first day of the month, sunrise is at 06:17 and sunset at 18:30. On the last day of April, sunrise is at 06:03 and sunset at 18:30 +07.

Sunshine

In Ko Samui, Thailand, the average sunshine in April 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 estimate of 11, and higher, represents an ultimate health vulnerability from exposure to the Sun's UV rays for the average person.
Note: A maximum high UV index of 12 in April translates into the following recommendations:
Adopt every vital precaution, unprotected skin and eyes may burn rapidly. It's important to stay in the shade and limit exposure to the sun from 10 a.m. to 4 p.m., when UV radiation is most intense, although remember that shade structures may not provide full sun protection. Enhance your sun protection with tightly woven, yet airy clothing. Broad-spectrum SPF 30+ sunscreen must be generously applied and reapplied every two hours or post any outdoor activity or swim. Be on guard! The reflective nature of sand and water boosts UV exposure.