September Weather in Koumac, New Caledonia

Last updated: August 31, 2025

In Koumac, New Caledonia, the average temperature in September hovers around 22°C (72°F), making it a pleasant time to visit. Expect minimums of 16°C (62°F) and maximums soaring up to 29°C (84°F). While you enjoy the mild weather, be prepared for an average precipitation of 16 mm (0.6 in) over just 2 days, with humidity levels at a comfortable 73%.

September Temperature in Koumac

In September in Koumac, the average temperature is 22°C (72°F), with maximums reaching 29°C (84°F) and minimums dropping as low as 16°C (62°F). This pleasant climate makes it a great time to visit Koumac for outdoor activities and exploration.

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

The chart illustrates September temperature patterns in Koumac, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Koumac, September typically has an average temperature of 22°C (72°F), with highs reaching up to 29°C (84°F) and lows dropping to around 16°C (62°F).

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

September Precipitation in Koumac

In Koumac in September, the precipitation amount is 16 mm (0.6 in) over a period of 2 days.

September Precipitation Trends in Koumac

The chart displays monthly precipitation patterns in Koumac, 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 Koumac, September typically receives around 16 mm (0.6 inches) of precipitation spread over approximately 2 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 Koumac

In Koumac in September, humidity is 73%. With an average temperature of 22°C (72°F), this humidity feels like a warm embrace that can make outdoor activities feel sticky and heavy, so it's best to stay hydrated and take frequent breaks while exploring.

September Average Humidity in Koumac

This chart illustrates the average monthly humidity levels in Koumac, 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 Koumac is approximately 73%, 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 Koumac

In Koumac in September, the maximum UV index is 12, which corresponds to an extreme Exposure Category. The time to burn is just 10 minutes, underscoring the importance of sun protection. For detailed information, you can check the Hourly UV Index in Koumac.

Maximum UV Index Levels in Koumac for September

The chart shows the monthly maximum UV Index (UVI) for Koumac 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 Koumac typically reaches 12, which falls under the extreme exposure category.

Data source: Koumac 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 Koumac Compares to Other Months

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

This table compares monthly weather conditions in Koumac, 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)	174 mm (6.9 inches)	81%	extreme
February Weather	27°C (80°F)	183 mm (7.2 inches)	81%	extreme
March Weather	26°C (80°F)	121 mm (4.7 inches)	81%	extreme
April Weather	25°C (78°F)	104 mm (4.1 inches)	82%	extreme
May Weather	24°C (75°F)	49 mm (1.9 inches)	79%	very high
June Weather	22°C (72°F)	30 mm (1.2 inches)	74%	high
July Weather	21°C (71°F)	54 mm (2.1 inches)	71%	very high
August Weather	21°C (71°F)	53 mm (2.1 inches)	74%	very high
September Weather	22°C (72°F)	16 mm (0.6 inches)	73%	extreme
October Weather	24°C (75°F)	61 mm (2.4 inches)	75%	extreme
November Weather	25°C (77°F)	40 mm (1.6 inches)	79%	extreme
December Weather	26°C (79°F)	148 mm (5.8 inches)	80%	extreme