September Weather in Sentani, Indonesia

Last updated: August 23, 2025

In September, the average temperature in Sentani, Indonesia hovers around 27°C (81°F), with daily variations ranging from a minimum of 24°C (76°F) to a maximum of 30°C (87°F). However, be prepared for frequent rain, as the region experiences 191 mm (7.5 in) of precipitation over 24 days. With an average humidity level of 86%, it's wise to expect a warm and humid atmosphere throughout your stay.

September Temperature in Sentani

In September, in Sentani, the average temperature is 27°C (81°F). The maximum can reach 30°C (87°F), while the minimum can be as low as 24°C (76°F). This pleasant climate makes Sentani an ideal destination for travelers seeking warm weather and outdoor activities.

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

The chart illustrates September temperature patterns in Sentani, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Sentani, September typically has an average temperature of 27°C (81°F), with highs reaching up to 30°C (87°F) and lows dropping to around 24°C (76°F).

Data source: Temperature data for Sentani generated using information from the Copernicus Climate Change Service.

September Precipitation in Sentani

In Sentani in September, the precipitation amount is 191 mm (7.5 in) spread over 24 days.

September Precipitation Trends in Sentani

The chart displays monthly precipitation patterns in Sentani, 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 Sentani, September typically receives around 191 mm (7.5 inches) of precipitation spread over approximately 24 days.

Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.

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Millimeters (mm) Inches (in)

September Humidity in Sentani

In Sentani in September, humidity is 86%. With an average temperature of 27°C (81°F), this humidity feels like walking through a steamy blanket, making traveling feel heavy and exhausting as each step absorbs the warm, moist air.

September Average Humidity in Sentani

This chart illustrates the average monthly humidity levels in Sentani, 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 Sentani is approximately 86%, offering insight into how humid the weather typically is during this month.

Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Sentani

In Sentani in September, the maximum UV index reaches an alarming 15, which falls into the extreme Exposure Category. With a time to burn of just 10 minutes, it's crucial to take precautions. For detailed information, you can check the Hourly UV Index in Sentani.

Maximum UV Index Levels in Sentani for September

The chart shows the monthly maximum UV Index (UVI) for Sentani 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 Sentani typically reaches 15, which falls under the extreme exposure category.

Data source: Sentani 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 Sentani Compares to Other Months

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

This table compares monthly weather conditions in Sentani, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	27°C (81°F)	200 mm (7.9 inches)	84%	extreme
February Weather	27°C (80°F)	310 mm (12.2 inches)	84%	extreme
March Weather	27°C (80°F)	320 mm (12.6 inches)	83%	extreme
April Weather	27°C (80°F)	301 mm (11.8 inches)	85%	extreme
May Weather	27°C (81°F)	231 mm (9.1 inches)	84%	extreme
June Weather	27°C (80°F)	234 mm (9.2 inches)	85%	extreme
July Weather	26°C (80°F)	265 mm (10.4 inches)	85%	extreme
August Weather	27°C (80°F)	229 mm (9.0 inches)	86%	extreme
September Weather	27°C (81°F)	191 mm (7.5 inches)	86%	extreme
October Weather	27°C (81°F)	228 mm (9.0 inches)	85%	extreme
November Weather	27°C (81°F)	303 mm (11.9 inches)	85%	extreme
December Weather	27°C (81°F)	312 mm (12.3 inches)	84%	extreme