September weather forecast
Balikpapan, Indonesia

Moving towards the end of the third quarter, rainfall in September slinks to its annual low at 78mm (3.07"). September ushers in the contrast of fewer rain showers against the preceding August. Daylight remains constant, allowing plenty of scope for sightseeing and exploration. The city remains lush and the beauty of green landscapes is worth marveling. The noticeably decreased rainfall signposts the exit of the monsoon season.

Temperature

Balikpapan starts September with an average high-temperature of a still moderately hot 29.7°C (85.5°F), a minor shift from August's 29.2°C (84.6°F). In Balikpapan, the average low-temperature during September nights tends to settle at a still warm 25.5°C (77.9°F), indicating a slight drop from the daytime peak.

Heat index

September's average heat index is computed to be a fiery hot 36°C (96.8°F). More preventive actions are needed, risk of heat exhaustion and heat cramps is significant. Prolonged activity may trigger heatstroke.
It is essential to grasp that the heat index's numbers are for shade and light wind settings. The direct sun can potentially cause the heat index to increase by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature' or 'real feel', is found by incorporating humidity levels into the air temperature measurement. Depending on the activity and the individual's heat perception, which may vary due to factors including wind, clothing, and metabolic variations, this effect remains subjective. Recognize that direct exposure to the sun can escalate the heat effect, potentially adding 15 Fahrenheit (8 Celsius) degrees to the heat index. Heat index values are largely significant for 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.
Sweat evaporation, driven by perspiration, is the method the human body uses to rid itself of excessive warmth. Greater relative humidity lessens the rate of evaporation, thus decreasing the body's heat dispersal, which gives rise to a sensation of overheating. If heat absorption isn't effectively countered by the body's cooling methods, body temperature surges, hinting at potential problems.

Humidity

In September, the average relative humidity is 78%.

Rainfall

September is the month with the least rainfall. Rain falls for 20.7 days and accumulates 78mm (3.07") of precipitation.

Sea temperature

The month with the coldest seawater in Balikpapan is September, with an average sea temperature of 28.4°C (83.1°F).
Note: Engaging in swimming, diving, or other water activities is highly enjoyable in temperatures ranging from 25°C (77°F) to 29°C (84.2°F), without any unpleasant sensations for prolonged durations.

Daylight

The average length of the day in September is 12h and 7min.
On the first day of the month, sunrise is at 06:09 and sunset at 18:15. On the last day of September, in Balikpapan, sunrise is at 05:58 and sunset at 18:06 WITA.

Sunshine

The average sunshine in September is 9.2h.

UV index

The months with the highest UV index in Balikpapan are January through December, with an average maximum UV index of 7. January through December, with an average maximum UV index of 7, are months with the lowest UV index. A UV Index value of 6 to 7 symbolizes a high threat to health from exposure to the Sun's UV radiation for the average person.
Note: During September, 7 as the daily maximum UV index converts into the following advice:
Shun overexposure. Protection from sun ravages is indispensable. Avoid direct Sun exposure from 10 a.m. to 4 p.m., a period when UV radiation is most intense, and remember that not all shade structures provide full protection. Consider a wide-brim hat essential for effective sun defense covering your face, neck, and eyes. Attention! UV radiation is ramped up when reflecting off sand and water surfaces.