September weather forecast
Changi, Singapore

The advent of September introduces slightly cooler temperatures, averaging from 25.8°C (78.4°F) to 31.2°C (88.2°F). This month takes the spotlight by having the least rain showers, alleviating the constraints on outdoor pursuits. With visibility peaking and humidity moderate, it's the perfect setup for sightseeing tours. September's skies are the clearest, revealing the city's serene skyline. The drop in cloud percentage introduces more sunshine hours, adjusting aptly with the city's animated nightlife.

Temperature

The transition into September in Changi notes an average high-temperature of a still tropical 31.2°C (88.2°F), revealing a mild distinction from the 31°C (87.8°F) in August. In the month of September, Changi experiences an average low-temperature of 25.8°C (78.4°F).

Heat index

September's heat index is evaluated at a very hot 39°C (102.2°F). Preventive measures are required to mitigate the risk of heat cramps and heat exhaustion. Continuous activity may precipitate heatstroke.
Heat index evaluations are typically in the context of light winds and shaded environments. Direct sunlight exposure may cause a 15 Fahrenheit (8 Celsius) degrees rise in the heat index.
Note: The heat index, also known as 'felt air temperature' or 'real feel', marries air temperature and humidity to produce a value illustrating perceived warmth. This effect is personal, influenced by the individual's physical activity and heat sensitivity, shaped by factors including wind, attire, and metabolic variations. The sun, when shining directly, can have a significant impact on the perceived temperature, increasing the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are largely significant for babies and toddlers. In general, younger individuals are at greater risk than adults because they tend to sweat less. Also, having a larger skin surface to body size ratio and greater heat production due to their active behavior contribute to this danger.
To offset high temperatures, the human body releases sweat which, upon evaporation, cools it down. An upsurge in relative humidity affects normal body cooling mechanisms by slowing evaporation, hence reducing the rate at which the body cools and intensifying the perception of heat. Accumulating more heat than the body can dissipate leads to an uptick in body temperature, with potential heat stress consequences.

Humidity

September and October, with an average relative humidity of 73%, are the least humid months in Changi.

Rainfall

The month with the least rainfall in Changi is September, when the rain falls for 23.6 days and typically collects 72mm (2.83") of precipitation.

Daylight

In September, the average length of the day is 12h and 7min.
On the first day of September, sunrise is at 06:59 and sunset at 19:08. On the last day of the month, sunrise is at 06:50 and sunset at 18:57 +08.

Sunshine

With an average of 8.9h of sunshine, September has the most sunshine of the year in Changi.

UV index

January through December, with an average maximum UV index of 7, are months with the highest UV index. The months with the lowest UV index in Changi, Singapore, are January through December, with an average maximum UV index of 7. A UV Index of 6 to 7 symbolizes a high health vulnerability from exposure to the Sun's UV rays for the ordinary person.
Note: The average daily UV index of 7 in September transforms into the following instructions:
Avoid overexposure. Fair-skinned individuals can burn in under 20 minutes. Remember that UV radiation from the Sun is strongest between 10 a.m. and 4 p.m. Make an effort to limit direct sun exposure during this time. Loose clothes with a tight weave are optimal for safeguarding yourself against the Sun's rays.