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September Weather in Dumai, Indonesia

Last updated: August 23, 2025

In Dumai, Indonesia, the average temperature in September hovers around 27°C (82°F), with minimums dipping to 23°C (73°F) and maximums soaring to 34°C (94°F). Expect 264 mm (10.4 in) of precipitation spread over 25 days, making it a notably humid month with an average of 89% humidity. Be prepared for both warmth and wet weather!

September Temperature in Dumai

In September in Dumai, the average temperature is 27°C (82°F). Maximums can reach 34°C (94°F), and minimums can be as low as 23°C (73°F). This climate makes it an ideal destination for travelers seeking warm weather and plenty of sunshine.

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

The chart illustrates September temperature patterns in Dumai, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Dumai, September typically has an average temperature of 27°C (82°F), with highs reaching up to 34°C (94°F) and lows dropping to around 23°C (73°F).
JanFebMarAprMayJunJulAugSepOctNovDec818282828382828281828181
Data source: Temperature data for Dumai 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 Dumai

In Dumai in September, the total precipitation amount reaches 264 mm (10.4 in) over the course of 25 days.

September Precipitation Trends in Dumai

The chart displays monthly precipitation patterns in Dumai, 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 Dumai, September typically receives around 264 mm (10.4 inches) of precipitation spread over approximately 25 days.
JanFebMarAprMayJunJulAugSepOctNovDec18495226257252153145173264285381295
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Dumai

In Dumai in September, humidity is 89%. With an average temperature of 27°C (82°F), this humidity feels like a warm, steamy blanket enveloping you, making outdoor activities challenging and encouraging travelers to seek the comfort of shaded areas or refreshing indoor spaces.

September Average Humidity in Dumai

This chart illustrates the average monthly humidity levels in Dumai, 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 Dumai is approximately 89%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec87%81%82%84%87%88%88%90%89%90%90%90%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Dumai

In Dumai 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 Dumai, you can check here.

Maximum UV Index Levels in Dumai for September

The chart shows the monthly maximum UV Index (UVI) for Dumai 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 Dumai typically reaches 14, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec131516151412121414141313
Data source: Dumai 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 Dumai Compares to Other Months

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

This table compares monthly weather conditions in Dumai, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather27°C (82°F)184 mm (7.3 inches)87%extreme
February Weather28°C (82°F)95 mm (3.7 inches)81%extreme
March Weather28°C (83°F)226 mm (8.9 inches)82%extreme
April Weather28°C (83°F)257 mm (10.1 inches)84%extreme
May Weather28°C (83°F)252 mm (9.9 inches)87%extreme
June Weather28°C (83°F)153 mm (6.0 inches)88%extreme
July Weather28°C (82°F)145 mm (5.7 inches)88%extreme
August Weather28°C (82°F)173 mm (6.8 inches)90%extreme
September Weather27°C (82°F)264 mm (10.4 inches)89%extreme
October Weather28°C (82°F)285 mm (11.2 inches)90%extreme
November Weather27°C (81°F)381 mm (15.0 inches)90%extreme
December Weather27°C (82°F)295 mm (11.6 inches)89%extreme

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