September weather forecast
Banjarmasin, Indonesia

Though September signals the commencement of the gradual return to a wetter season, Banjarmasin, Indonesia, still benefits from the residual warmer weather from August. Slightly increased rainfall does not drastically affect the prevailing favorable weather conditions. The increased cloud cover slightly decreases visibility, yet the sufficient sunshine hours present sufficient time for taking pleasure in outdoor activities in the city. Serving as a fitting prelude to the wet season, conditions remain relatively dry with trace rainfall of 35mm (1.38").

Temperature

Banjarmasin experiences an average high-temperature of a still hot 32.3°C (90.1°F) in September, subtly different from August's 31.4°C (88.5°F). Banjarmasin observes an average low-temperature of 23.8°C (74.8°F) during September.

Heat index

September's mean heat index is evaluated at an extremely hot 43°C (109.4°F). Note: Heat exhaustion and heat cramps are probable. Heatstroke can follow with prolonged activity.
It is important to note that the heat index values are for shaded areas and light wind scenarios. The heat index could experience an increase of 15 Fahrenheit (8 Celsius) degrees due to direct sunlight.
Note: The heat index, also known as 'apparent temperature' or 'feels like', shows a temperature sensation when both heat and moisture conditions are combined. Additional elements encompassing metabolic differences, the degree of physical activity, and attire can impact the individual's perception of temperature. Consider the fact that direct sun exposure can influence how hot one feels, potentially raising the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly relevant to babies and toddlers. Youngsters typically face more danger than adults since they sweat less. Their larger skin surface compared to their small bodies and heightened heat production from their activities augment their vulnerability.
The primary way humans combat excessive warmth is by perspiring, letting sweat evaporate and cool the body. Augmented relative humidity impedes typical body cooling mechanisms by lowering the evaporation rate, resulting in decreased body cooling and an amplified perception of heat. 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

The average relative humidity in September in Banjarmasin is 75%.

Rainfall

In Banjarmasin, during September, the rain falls for 9.8 days and regularly aggregates up to 35mm (1.38") of precipitation. In Banjarmasin, during the entire year, the rain falls for 249.1 days and collects up to 1596mm (62.83") of precipitation.

Sea temperature

In Banjarmasin, the average seawater temperature in September is 28.4°C (83.1°F).
Note: Engaging in water activities, such as swimming or diving, in temperatures from 25°C (77°F) to 29°C (84.2°F) is very pleasurable for extended periods, without any discomfort.

Daylight

In September, the average length of the day in Banjarmasin is 12h and 5min.
On the first day of the month, sunrise is at 06:20 and sunset at 18:23. On the last day of September, sunrise is at 06:07 and sunset at 18:15 WITA.

Sunshine

The months with the most sunshine are September and November, with an average of 9.3h of sunshine.

UV index

The months with the highest UV index in Banjarmasin are January through December, with an average maximum UV index of 7. The months with the lowest UV index are January through December, with an average maximum UV index of 7. A UV Index value of 6 to 7 symbolizes a high threat to health from unsafe exposure to UV radiation for average individuals.
Note: A maximum UV index of 7 in September translates into the following recommendations:
Incorporate safeguards and honour sun safety principles. Protection from skin and eye damage is obligatory. Remember that the sun's UV radiation is strongest between 10 a.m. and 4 p.m. Make an effort to avoid direct sun exposure during these hours. For a sun-safe wardrobe, go for clothes that are tightly woven and generously sized. Caution! The reflection of sand and water significantly amplifies the Sun's UV radiation.