September weather forecast
Jerudong, Brunei

September, the first month of the autumn in Jerudong, is still a hot month, with an average temperature fluctuating between 30.8°C (87.4°F) and 25.8°C (78.4°F).

Temperature

In Jerudong, the average high-temperature in September is almost the same as in August - a still hot 30.8°C (87.4°F). In Jerudong, the average low-temperature is 25.8°C (78.4°F).

Heat index

The average heat index in September is appraised at a torrid 39°C (102.2°F). Take extra precautions, as heat cramps and heat exhaustion are possible. Sustained activity may result in heatstroke.
Take into consideration that the heat index values are calculated for shade and light wind conditions. 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', 'apparent temperature', or 'felt air temperature', combines air temperature and relative humidity to represent a human perceived temperature equivalent. Additional factors like activity, wind, differences in body mass, height, and shape, and metabolic differences affect individual temperature impact. Be aware that direct exposure to sunlight increases heat impact and may raise the heat index 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.
The human body normally cools itself by perspiration. Excessive warmth is eliminated from the body by evaporation of sweat. Under high air temperature and humidity (high heat index) conditions, perspiration is limited, and the perception of heat is increased. When heat gain exceeds the level the body can remove, body temperature begins to rise, and heat-related illnesses and disorders may develop.

Humidity

August and September, with an average relative humidity of 75%, are the least humid months in Jerudong.

Rainfall

In Jerudong, during September, the rain falls for 25.9 days and regularly aggregates up to 113mm (4.45") of precipitation. Throughout the year, there are 310.9 rainfall days, and 1693mm (66.65") of precipitation is accumulated.

Daylight

In Jerudong, the average length of the day in September is 12h and 9min.
On the first day of September, sunrise is at 06:14 and sunset at 18:27. On the last day of the month, sunrise is at 06:08 and sunset at 18:13 +08.

Sunshine

The month with the most sunshine is September, with an average of 9h of sunshine.

UV index

The months with the highest UV index are January through December, with an average maximum UV index of 7. January through December, with an average maximum UV index of 7, are months with the lowest UV index. A UV Index value of 6 to 7 symbolizes a high health hazard from unprotected exposure to Sun's UV rays for the ordinary person.
Note: The average daily UV index of 7 in September transform into the following instructions:
Take precautions against overexposure. Fair-skinned people may get burned in less than 20 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. A wide-brim hat offers excellent sun protection for the eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun.