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 in Lahad Datu offers an insignificantly cooler and slightly drier contrast to August.

Temperature

As August transitions into September, Lahad Datu records an average high-temperature of a still hot 30.7°C (87.3°F), showing a gentle shift from the preceding month. An average low-temperature of 22.1°C (71.8°F) is common during the nights of September.

Heat index

For most parts of September, the heat index is computed to be a blistering 41°C (105.8°F). Incorporate extra safety measures to avoid heat exhaustion and heat cramps. Continuous activity could provoke heatstroke.
Observations indicate that the heat index values are for shady locations with light wind. Exposure to the sun directly might heighten the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' or 'real feel', combines air temperature and relative humidity to represent a human perceived temperature equivalent. Metabolic differences, pregnancy status, and the level of physical activity are additional factors influencing an individual's weather perception. It is important to note that direct sunlight can intensify the weather impact, potentially raising the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially crucial for babies and toddlers. Kids are usually in more danger than grown-ups as they tend to sweat less. Plus, their bigger skin surface in relation to their small frames and increased heat generation due to their activity level make them more susceptible.
Perspiring is a crucial mechanism for the human body, allowing it to release excessive warmth through evaporating sweat. When relative humidity is at high levels, the evaporation rate lessens, causing the body to keep more heat than it would in less humid conditions. As the body accumulates more heat than it can release, body temperature goes up, increasing the risk of heat-related health issues.

Humidity

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

Rainfall

In Lahad Datu, Malaysia, during September, the rain falls for 25 days and regularly aggregates up to 103mm (4.06") of precipitation. Throughout the year, there are 293.8 rainfall days, and 1354mm (53.31") of precipitation is accumulated.

Sea temperature

In September, the average sea temperature is 29.1°C (84.4°F).
Note: Surface water temperatures ranging from 25°C (77°F) to 29°C (84.2°F) are considered superb and highly pleasant for water activities over extended periods.

Daylight

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

Sunshine

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 value of 6 to 7 symbolizes a high health vulnerability from unprotected exposure to Sun's UV rays for average individuals.
Note: A daily high UV index of 7 in September leads to these guidelines:
Shun overexposure. Protection from sun ravages is indispensable. From 10 a.m. to 4 p.m., when UV radiation is at its strongest, limit direct exposure to the Sun and note that shade structures may not provide full sun protection. Your best bet for sun defense on the face, eyes, and neck is a hat with a wide brim. Alert! Sand and water increase UV exposure due to their reflective properties.