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September Weather in Bontang, Indonesia

Last updated: August 23, 2025

In Bontang, Indonesia during September, the average temperature hovers around 27°C (81°F), with a minimum of 24°C (75°F) and a maximum peaking at 31°C (89°F). Rainfall is not uncommon, as the region experiences 163 mm (6.4 in) of precipitation spread over 22 days. Expect a high humidity level of 89%, making for a warm and possibly damp atmosphere.

September Temperature in Bontang

In September in Bontang, the average temperature is 27°C (81°F). Maximums can reach 31°C (89°F) and minimums can be as low as 24°C (75°F). This warm climate makes Bontang an ideal destination for travelers looking to enjoy pleasant weather and outdoor activities.

September Weather in Bontang: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Bontang, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Bontang, September typically has an average temperature of 27°C (81°F), with highs reaching up to 31°C (89°F) and lows dropping to around 24°C (75°F).
JanFebMarAprMayJunJulAugSepOctNovDec808081818181808081818181
Data source: Temperature data for Bontang generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

September Precipitation in Bontang

In Bontang in September, the precipitation amount is 163 mm (6.4 in) over the course of 22 days.

September Precipitation Trends in Bontang

The chart displays monthly precipitation patterns in Bontang, with values for each month alongside September’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how September’s conditions compare to those of other months. In Bontang, September typically receives around 163 mm (6.4 inches) of precipitation spread over approximately 22 days.
JanFebMarAprMayJunJulAugSepOctNovDec193184233222221215186160163200239272
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Bontang

In Bontang in September humidity is 89%. With an average temperature of 27°C (81°F), this humidity feels like a wet blanket enveloping you, making outdoor activities challenging and travel a little less comfortable.

September Average Humidity in Bontang

This chart illustrates the average monthly humidity levels in Bontang, with September’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In September, average humidity in Bontang is approximately 89%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec91%90%90%89%87%87%88%90%89%88%86%88%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Bontang

In Bontang in September, the maximum UV index is 14, which corresponds to an extreme Exposure Category. The time to burn is just 10 minutes, so it's crucial to take precautions. For the detailed hourly UV index in Bontang, you can check here.

Maximum UV Index Levels in Bontang for September

The chart shows the monthly maximum UV Index (UVI) for Bontang in September, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In September, the maximum UV index in Bontang typically reaches 14, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec141617151412131414151413
Data source: Bontang September UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

  •  Extreme (11+): Avoid the sun, stay in shade.
  •  Very High (8-10): Limit sun exposure.
  •  High (6-7): Use SPF 30+ and protective clothing.
  •  Moderate (3-5): Midday shade recommended.
  •  Low (0-2): No protection needed.

How September Weather in Bontang Compares to Other Months

Weather in Bontang varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Bontang, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in Bontang, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather27°C (80°F)193 mm (7.6 inches)90%extreme
February Weather27°C (81°F)184 mm (7.2 inches)90%extreme
March Weather27°C (81°F)233 mm (9.2 inches)90%extreme
April Weather27°C (81°F)222 mm (8.8 inches)89%extreme
May Weather27°C (82°F)221 mm (8.7 inches)86%extreme
June Weather27°C (81°F)215 mm (8.5 inches)87%extreme
July Weather27°C (81°F)186 mm (7.3 inches)88%extreme
August Weather27°C (81°F)160 mm (6.3 inches)90%extreme
September Weather27°C (81°F)163 mm (6.4 inches)89%extreme
October Weather27°C (81°F)200 mm (7.9 inches)88%extreme
November Weather27°C (81°F)239 mm (9.4 inches)86%extreme
December Weather27°C (81°F)272 mm (10.7 inches)88%extreme

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