September weather forecastMentoso, Indonesia

Weather in September

September, the first month of the spring in Mentoso, is still a hot month, with an average temperature varying between 22.9°C (73.2°F) and 33.7°C (92.7°F).

Temperature

September begins with an average high-temperature of a still hot 33.7°C (92.7°F), reflecting close similarity to the preceding month. Mentoso cools down to an average low-temperature of 22.9°C (73.2°F) throughout the month of September.

Heat index

For September, the heat index is appraised at a scorching 43°C (109.4°F). Mindful: Heat cramps and heat exhaustion are to be expected. Extended physical effort might result in heatstroke.
When assessing, remember that heat index measurements are for light winds and shaded spots. The heat index values could be amplified by up to 15 Fahrenheit (8 Celsius) degrees in direct sunlight.
Note: The heat index, also known as 'apparent temperature' or 'felt air temperature', is a calculated temperature value of how hot it feels when the moisture in the air is factored in. A person's impression of weather can be swayed by numerous aspects, among them metabolic variations, pregnancy, and activity levels. Given direct exposure to sunlight, one might experience a rise in the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are quite important for children. Children frequently do not understand the need for recuperation and hydration. Thirst, being a late manifestation of dehydration, underlines the need to hydrate frequently, especially when engaging in prolonged physical exercises.
In the face of high temperatures, the human body's reflex is to perspire, leveraging sweat evaporation for cooling. Under high air temperature and high humidity (high heat index) conditions, the body's ability to perspire is compromised, increasing the sensation of heat. 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 least humid month in Mentoso is September, with an average relative humidity of 65%.

Rainfall

In Mentoso, during September, the rain falls for 8.8 days and regularly aggregates up to 19mm (0.75") of precipitation. In Mentoso, during the entire year, the rain falls for 232.5 days and collects up to 1054mm (41.5") of precipitation.

Sea temperature

In Mentoso, in September, the average water temperature is 28.5°C (83.3°F).
Note: Water activities including swimming and diving at temperatures from 25°C (77°F) to 29°C (84.2°F) are deemed very pleasurable and enjoyable for extended periods, devoid of discomfort.

Daylight

In September, the average length of the day in Mentoso is 12h and 4min.
On the first day of September in Mentoso, sunrise is at 05:32 and sunset at 17:31. On the last day of the month, sunrise is at 05:17 and sunset at 17:26 WIB.

Sunshine

August and September, with an average of 9.7h of sunshine, are months with the most sunshine.

UV index

February through December, with an average maximum UV index of 7, are months with the highest UV index. A UV Index of 6 to 7 symbolizes a high health risk from unprotected exposure to Sun's UV rays for the ordinary person.
Note: A daily maximum UV index of 7 in September translates into the following instructions:
Fend off overexposure. Sun protection is vital. During the period from 10 a.m. to 4 p.m., UV radiation is highest. Try to avoid direct sunlight during these hours. Limit sun-induced ocular harm with sunglasses that feature UVA and UVB filtration. Caution! The reflection of sand and water significantly increases the intensity of the Sun's UV radiation.