September weather forecast
Lahad Datu, Malaysia

September ushers in an increase in average high temperature from 30.5°C (86.9°F) to 30.7°C (87.3°F). Comparatively, rainfall decreases from August's 129mm (5.08") to 103mm (4.06"), offering a little respite from the constant rainfall. While the other factors remain more or less unaltered, the sea temperature witnesses a slight increase to 29.1°C (84.4°F). Thus, the weather in September offers an insignificantly cooler and slightly drier contrast to August.

Temperature

The arrival of September brings an average high-temperature of a still tropical 30.7°C (87.3°F), subtly diverging from August's 30.5°C (86.9°F). An average nighttime temperature of 22.1°C (71.8°F) is recorded during September.

Heat index

The heat index for September is computed to be a blisteringly hot 41°C (105.8°F). Implement additional cautionary measures, heat cramps and heat exhaustion could occur. Prolonged activity might induce heatstroke.
Realize that the values for the heat index are set for shaded places and light winds. Direct exposure to sunshine could lead to a heat index increase by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel' or 'feels like', determines the feeling of heat when you account for the relative humidity. Additional elements including metabolic differences, the level of physical activity, and attire have a role in shaping the individual's temperature perception. Awareness of direct sun exposure is crucial as it has the potential to heighten the weather's effects, pushing up the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are extremely significant for children. Children frequently do not comprehend the need for rest and hydration. Thirst is an advanced stage of dehydration - staying hydrated, especially during extended physical exercises, is essential.
To offset high temperatures, the human body releases sweat which, upon evaporation, cools it down. During high air temperature and humidity (high heat index), the process of perspiration is hindered, intensifying the sensation of heat. Elevated heat gain compared to the body's release capability poses risks of dehydration and potential overheating.

Humidity

The average relative humidity in September in Lahad Datu is 84%.

Rainfall

In Lahad Datu, in September, it is raining for 25 days, with typically 103mm (4.06") of accumulated precipitation. In Lahad Datu, during the entire year, the rain falls for 293.8 days and collects up to 1354mm (53.31") of precipitation.

Sea temperature

In September, the average sea temperature is 29.1°C (84.4°F).
Note: Water temperature between 25°C (77°F) and 29°C (84.2°F) is perceived as agreeably warm, making all water activities enjoyable without the risk of discomfort over lengthy durations.

Daylight

The average length of the day in September in Lahad Datu is 12h and 9min.
On the first day of September, sunrise is at 6:00 am and sunset at 6:12 pm. On the last day of the month, sunrise is at 5:54 am and sunset at 5:58 pm +08.

Sunshine

In Lahad Datu, the average sunshine in September is 9.7h.

UV index

The months with the highest UV index are March through July, September through December, with an average maximum UV index of 7. A UV Index estimate of 6 to 7 represents a high threat to health from unprotected exposure to Sun's UV rays for ordinary individuals.
Note: The maximum UV index of 7 during September leads to these instructions:
Endorse precautions and be consistent with sun safety guidelines. Preventing sunburn is paramount. Seek shade and limit direct sun exposure between 10 a.m. and 4 p.m., the peak period for UV radiation. Keep in mind that shade structures like parasols or canopies do not offer complete sun protection. Opt for tightly woven and loose clothing to enhance protection from the Sun. Caution! Sand and water reflections can notably increase the UV radiation intensity.