September Weather in Mersam, Indonesia

Last updated: August 23, 2025

In September, the average temperature in Mersam, Indonesia hovers around a warm 28°C (82°F). You'll experience pleasant evenings with a minimum temperature of 22°C (72°F), while daytime highs can reach up to 36°C (97°F). Be prepared for some rain, as 173 mm (6.8 in) of precipitation can be expected over 19 days, coupled with a high average humidity of 87%. It's a great time to enjoy the lush surroundings!

September Temperature in Mersam

In September in Mersam, the average temperature is 28°C (82°F). Maximums can reach 36°C (97°F), while minimums can drop to as low as 22°C (72°F). It's an ideal time for travelers seeking warm weather and plenty of sunshine.

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

The chart illustrates September temperature patterns in Mersam, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Mersam, September typically has an average temperature of 28°C (82°F), with highs reaching up to 36°C (97°F) and lows dropping to around 22°C (72°F).

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

September Precipitation in Mersam

In Mersam in September, the precipitation amount is 173 mm (6.8 in) over a span of 19 days.

September Precipitation Trends in Mersam

The chart displays monthly precipitation patterns in Mersam, 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 Mersam, September typically receives around 173 mm (6.8 inches) of precipitation spread over approximately 19 days.

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

Choose your preferred precipitation unit

Millimeters (mm) Inches (in)

September Humidity in Mersam

In Mersam in September humidity is 87%. With an average temperature of 28°C (82°F), this humidity feels like a warm, thick blanket wrapping around you, making travel challenging as you navigate the air's heavy moisture.

September Average Humidity in Mersam

This chart illustrates the average monthly humidity levels in Mersam, 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 Mersam is approximately 87%, 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 Mersam

In Mersam 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 Mersam, you can check here.

Maximum UV Index Levels in Mersam for September

The chart shows the monthly maximum UV Index (UVI) for Mersam 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 Mersam typically reaches 14, which falls under the extreme exposure category.

Data source: Mersam 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 Mersam Compares to Other Months

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

This table compares monthly weather conditions in Mersam, 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 (80°F)	178 mm (7.0 inches)	90%	extreme
February Weather	27°C (81°F)	164 mm (6.4 inches)	88%	extreme
March Weather	27°C (81°F)	282 mm (11.1 inches)	88%	extreme
April Weather	27°C (81°F)	271 mm (10.7 inches)	85%	extreme
May Weather	28°C (82°F)	241 mm (9.5 inches)	85%	extreme
June Weather	27°C (81°F)	165 mm (6.5 inches)	85%	extreme
July Weather	27°C (81°F)	131 mm (5.2 inches)	86%	extreme
August Weather	28°C (82°F)	136 mm (5.4 inches)	88%	extreme
September Weather	28°C (82°F)	173 mm (6.8 inches)	87%	extreme
October Weather	27°C (82°F)	254 mm (10.0 inches)	87%	extreme
November Weather	27°C (81°F)	284 mm (11.2 inches)	86%	extreme
December Weather	27°C (81°F)	219 mm (8.6 inches)	88%	extreme