September weather forecast
Slim River, Malaysia

The first month of the autumn, September, is still a hot month in Slim River, Malaysia, with an average temperature fluctuating between 21.5°C (70.7°F) and 31°C (87.8°F).

Temperature

The shift into September uncovers an average high-temperature of a still tropical 31°C (87.8°F), subtly different from the previous month. Throughout September nights, Slim River registers an average low-temperature of 21.5°C (70.7°F).

Heat index

The heat index value for September is appraised at an extremely hot 41°C (105.8°F). Greater preventive actions are needed, heat exhaustion and heat cramps are likely. Persistent activity could provoke heatstroke.
Realize that the values for the heat index are set for shaded places and light winds. Being under direct sunlight might amplify the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel' or 'apparent temperature', is a single figure representing how weather conditions feel when combining temperature and humidity. The effect of weather is individual, with a variety of people experiencing it differently due to distinctions in body mass, height, and level of activity. When you're directly under the sun's rays, remember that the heat index may surge by 15 Fahrenheit (8 Celsius) degrees. Heat index values are extremely significant for children. Children often overlook the need for breaks and fluid intake. Thirst is a late-stage sign of dehydration - hence, it is necessary to stay hydrated, especially during extended periods of physical activities.
Evaporation of sweat is the main factor behind the cooling effect of perspiration in the human body. In situations of high air temperature combined with high humidity (significant heat index), the body's ability to perspire is reduced, heightening the sense of warmth. If heat absorption exceeds the body's cooling ability, body temperature can elevate, resulting in potential thermal illnesses.

Humidity

The average relative humidity in September is 79%.

Rainfall

In Slim River, in September, it is raining for 27.2 days, with typically 116mm (4.57") of accumulated precipitation. Throughout the year, in Slim River, there are 310.8 rainfall days, and 1623mm (63.9") of precipitation is accumulated.

Daylight

In September, the average length of the day is 12h and 8min.
On the first day of September in Slim River, sunrise is at 7:08 am and sunset at 7:19 pm. On the last day of the month, sunrise is at 7:01 am and sunset at 7:06 pm +08.

Sunshine

June and September, with an average of 8.6h of sunshine, are months with the most sunshine in Slim River.

UV index

March through July and September, with an average maximum UV index of 7, are months with the highest UV index. A UV Index estimate of 6 to 7 represents a high health vulnerability from exposure to the Sun's UV radiation for the average person.
Note: A typical high UV index of 7 in September suggests the following recommendations:
Escape overexposure. People with light skin may incur burns in fewer than 20 minutes. Stay in the shade and limit direct sun exposure between 10 a.m. and 4 p.m., when UV radiation is at its strongest. Remember, however, that not all shade structures provide full sun protection. For minimizing sun-related eye damage, always choose sunglasses with UVA and UVB coverage.