September weather forecast and climate
Kuala Lumpur, Malaysia

The first month of the autumn, September, is still a hot month in Kuala Lumpur, Malaysia, with temperature in the range of an average low of 23.2°C (73.8°F) and an average high of 32.1°C (89.8°F).

Temperature

In September, the average high-temperature is practically the same as in August - a still tropical 32.1°C (89.8°F). In September, in Kuala Lumpur, the average low-temperature is 23.2°C (73.8°F).

Heat index

The average heat index in September is appraised at a blistering 42.2°C (108°F). Beware - heat cramps and heat exhaustion are very likely. Heatstroke is imminent with prolonged activity.
Note that heat index values are valued for light wind and location in the shade. 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', 'felt air temperature', 'real feel', or 'apparent temperature', is a measure of how hot it feels when the actual air humidity is factored in. Additional factors like pregnancy, metabolic differences, differences in body mass, height, and shape, and activity influence one's weather impression. Be aware that direct exposure to sunlight increases heat impact, and may raise the heat index additionally, by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly important for children. 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.
To prevent overheating and help regulate its internal temperature, the human body sweat and rely on the evaporation to cool down. With a lot of moisture in the air, the evaporation process is not as effective, and the body does not cool down as efficiently, creating a perception of overheating. When heat gain surpasses the level the body can shed, body temperature begins to increase, and consequently, overheating and dehydration can occur, with varying severity.

Humidity

In Kuala Lumpur, the average relative humidity is 74%.

Rainfall

In Kuala Lumpur, during 24.1 rainfall days, 47mm (1.85") of precipitation is typically accumulated. Throughout the year, in Kuala Lumpur, there are 287.9 rainfall days, and 866mm (34.09") of precipitation is accumulated.

Snowfall

The only month with snowfall is September. The month with the most snowfall in Kuala Lumpur is September when snow falls for 0.1 days and typically aggregates up to 2mm (0.08") of snow.

Daylight

The average length of the day is 12.1h.

Sunshine

Months with the most sunshine in Kuala Lumpur are June, July and September, with an average of 8.8h of sunshine.

UV index

February through December, with an average maximum UV index of 7, are months with the highest UV index in Kuala Lumpur. A UV Index estimate of 6 to 7 represents a high health vulnerability from the exposure to the Sun's UV radiation for ordinary individuals.
Note: In September, the average maximum UV index of 7 translate into the following recommendations:
Take precautions and utilize sun safety practices. Protection against the skin and eye damage is required. 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. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects. Beware! The strength of the UV rays is increased nearly double-fold by the reflection of the snow.