September Weather in Isak, Indonesia

Last updated: August 23, 2025

In Isak, Indonesia, the average temperature in September is a pleasant 20°C (68°F). Expect a minimum of 14°C (58°F) and a maximum of 29°C (84°F), making it a comfortable time to visit. However, be prepared for 224 mm (8.8 in) of precipitation over 23 days, with an average humidity of a rather high 86%. Make sure to pack accordingly!

September Temperature in Isak

In September in Isak, the average temperature is 20°C (68°F). Maximum temperatures can reach 29°C (84°F), while minimums can drop to as low as 14°C (58°F). This mild climate makes Isak an ideal destination for travelers looking to enjoy comfortable outdoor activities.

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

The chart illustrates September temperature patterns in Isak, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Isak, September typically has an average temperature of 20°C (68°F), with highs reaching up to 29°C (84°F) and lows dropping to around 14°C (58°F).

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

September Precipitation in Isak

In Isak in September, the total precipitation amount is 224 mm (8.8 in), recorded over a span of 23 days.

September Precipitation Trends in Isak

The chart displays monthly precipitation patterns in Isak, 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 Isak, September typically receives around 224 mm (8.8 inches) of precipitation spread over approximately 23 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 Isak

In Isak in September, humidity is 86%. With an average temperature of 20°C (68°F), this humidity feels like a warm, heavy blanket wrapping around you, making outdoor activities challenging and necessitating frequent breaks for hydration and shade while traveling.

September Average Humidity in Isak

This chart illustrates the average monthly humidity levels in Isak, 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 Isak 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 Isak

In Isak 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 Isak.

Maximum UV Index Levels in Isak for September

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

Data source: Isak 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 Isak Compares to Other Months

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

This table compares monthly weather conditions in Isak, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	20°C (68°F)	163 mm (6.4 inches)	80%	extreme
February Weather	20°C (68°F)	106 mm (4.2 inches)	73%	extreme
March Weather	20°C (69°F)	157 mm (6.2 inches)	74%	extreme
April Weather	20°C (69°F)	220 mm (8.7 inches)	69%	extreme
May Weather	21°C (69°F)	294 mm (11.6 inches)	75%	extreme
June Weather	20°C (69°F)	127 mm (5.0 inches)	81%	extreme
July Weather	20°C (69°F)	158 mm (6.2 inches)	79%	extreme
August Weather	20°C (68°F)	171 mm (6.7 inches)	84%	extreme
September Weather	20°C (68°F)	224 mm (8.8 inches)	86%	extreme
October Weather	20°C (68°F)	275 mm (10.8 inches)	86%	extreme
November Weather	20°C (67°F)	362 mm (14.3 inches)	86%	extreme
December Weather	20°C (68°F)	348 mm (13.7 inches)	86%	extreme