September weather forecast
Pontianak, Indonesia

In September, Pontianak's weather maintains a rather steady course. Cloud cover and rainfall days have a slight uptick again while the sea temperature steadies, impacting beachside leisure. Despite this, the city retains its overall warm character, supported by prevalent humidity and a constant share of daylight hours. Wind speed experiences a subtle decline, resulting in lowered wind turbulence. High temperatures persist, peaking at 32.3°C (90.1°F), reinforcing the city's tropical climate vibe.

Temperature

The commencement of September introduces an average high-temperature of a still hot 32.3°C (90.1°F), closely mirroring the preceding month. An average minimum temperature of 23.8°C (74.8°F) is recorded during the month of September.

Heat index

The heat index value for September is appraised at a blazing hot 45°C (113°F). Heed: Expect heat cramps and heat exhaustion. Continued action may cause heatstroke.
Regarding the heat index, one should be aware it's determined by shaded settings and mild winds. With exposure to direct sunlight, the heat index may be increased by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like' or 'real feel', is a metric representing the sensation of warmth when air temperature and moisture come together. This effect tends to be personal, with the weather perception differing among individuals due to variations in body mass, height, and exertion. Consider that direct sun exposure can intensify the felt heat, adding potentially 15 Fahrenheit (8 Celsius) degrees to the heat index. Heat index values are largely significant for babies and toddlers. Young ones often ignore the need to take a break and drink fluids. Thirst is a late-stage symptom of dehydration - hence, maintaining hydration, particularly during extended physical activities, is crucial.
The body's inherent cooling system operates through perspiration, wherein evaporating sweat offsets excessive heat. When the level of relative humidity is elevated, evaporation diminishes, causing more warmth to be retained in the body than in dry air. As the body accumulates more heat than it can release, body temperature goes up, increasing the risk of heat-related health issues.

Humidity

September is the least humid month, with an average relative humidity of 79%.

Rainfall

In Pontianak, in September, it is raining for 19.5 days, with typically 75mm (2.95") of accumulated precipitation. Throughout the year, in Pontianak, Indonesia, there are 282.2 rainfall days, and 1495mm (58.86") of precipitation is accumulated.

Sea temperature

In Pontianak, in September, the average water temperature is 29°C (84.2°F).
Note: Water temperature between 25°C (77°F) and 29°C (84.2°F) is perceived as agreeably warm, making all water activities enjoyable without the risk of discomfort over lengthy durations.

Daylight

September has the shortest days of the year in Pontianak, with an average of 12h and 6min of daylight.
On the first day of September in Pontianak, sunrise is at 05:39 and sunset at 17:45. On the last day of the month, sunrise is at 05:29 and sunset at 17:35 WIB.

Sunshine

September has the most sunshine of the year, with an average of 8.6h of sunshine.

UV index

January through December, with an average maximum UV index of 7, are months with the highest UV index in Pontianak. The months with the lowest UV index in Pontianak are January through December, with an average maximum UV index of 7. A UV Index reading of 6 to 7 represents a high health hazard from exposure to the Sun's UV radiation for average individuals.
Note: In September, the UV index of 7 transforms into the following advice:
Ward off overexposure. Defence against solar harm is crucial. The Sun's UV radiation is most intense from 10 a.m. to 4 p.m. Try to avoid direct sun exposure during these hours. Safeguard your eyes, ears, and face from sun rays with the aid of a wide-brim hat. Be on guard! The reflective nature of sand and water boosts UV exposure.