September weather forecast
Jerudong, Brunei

September unveils a minor slide in high temperatures, standing at a comfortable 30.8°C (87.4°F). Rainfall volume levels show a downward trend compared to the previous months. This month also records a consistent daylight duration similar to August. The wind speed remains virtually the same, contributing to a seamless transition from August to September. With mild alterations, September maintains an almost identical climatic tapestry.

Temperature

With the onset of September, the average high-temperature stands at a still hot 30.8°C (87.4°F), closely aligned with August's 30.9°C (87.6°F). Jerudong registers a subtle dip to an average of 25.8°C (78.4°F) during the nights of September.

Heat index

For most parts of September, the heat index is appraised at a very hot 39°C (102.2°F). More protective measures are required - heat exhaustion and heat cramps are likely. Heatstroke may follow lengthy activity.
Records show heat index calculations are tailored for shaded regions and mild winds. The direct sun can potentially cause the heat index to increase by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature' or 'feels like', is a calculated temperature value of how hot it feels when the moisture in the air is factored in. One's perception of temperature can vary depending on physical activity and individual heat sensitivity, influenced by factors like wind, attire, and metabolic variations. Given the impact of direct sunlight, it's noteworthy that the felt temperature can rise by 15 Fahrenheit (8 Celsius) degrees. Heat index values are quite important for babies and toddlers. Children regularly disregard the necessity to rest and replenish fluids. Thirst is a late symptom of dehydration - thus, maintaining hydration, particularly during long-lasting physical activities, is essential.
Perspiring is a crucial mechanism for the human body, allowing it to release excessive warmth through evaporating sweat. With excessive moisture in the atmosphere, the effectiveness of the evaporation process is decreased, causing the body to cool down less efficiently, leading to a sensation of overheating. If heat absorption exceeds the body's cooling ability, body temperature can elevate, resulting in potential thermal illnesses.

Humidity

The months with the lowest humidity are August and September, with an average relative humidity of 75%.

Rainfall

In Jerudong, in September, during 25.9 rainfall days, 113mm (4.45") of precipitation is typically accumulated. In Jerudong, during the entire year, the rain falls for 310.9 days and collects up to 1693mm (66.65") of precipitation.

Daylight

In Jerudong, the average length of the day in September is 12h and 9min.
On the first day of the month, sunrise is at 06:14 and sunset at 18:26. On the last day of September, sunrise is at 06:08 and sunset at 18:12 +08.

Sunshine

With an average of 9h of sunshine, September has the most sunshine of the year.

UV index

January through December, with an average maximum UV index of 7, are months with the highest UV index. January through December, with an average maximum UV index of 7, are months with the lowest UV index. A UV Index of 6 to 7 symbolizes a high health vulnerability from exposure to the Sun's UV rays for average individuals.
Note: During September, 7 as the daily maximum UV index converts into the following advice:
Avoid excessive sunlight. Those with lighter skin may experience burning in less than 20 minutes. The time between 10 a.m. and 4 p.m. is when UV radiation is at its peak. Limit exposure to direct sunlight during these hours. A hat with a broad brim is indispensable, filtering out up to half of UV rays.