September Weather in Alotau, Papua New Guinea

Last updated: August 31, 2025

In Alotau, Papua New Guinea, the average temperature in September hovers around 24°C (76°F), with a comfortable range from a minimum of 19°C (67°F) to a maximum of 29°C (84°F). Be prepared for a wet month, as precipitation totals 357 mm (14.1 in) over approximately 25 days. With an average humidity level of 80%, it's a perfect time to embrace the lush and vibrant scenery!

September Temperature in Alotau

In September in Alotau, the average temperature is 24°C (76°F). Maximums can reach 29°C (84°F), while minimums can dip to as low as 19°C (67°F). This pleasant climate makes Alotau an ideal destination for travelers seeking comfortable weather.

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

The chart illustrates September temperature patterns in Alotau, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Alotau, September typically has an average temperature of 24°C (76°F), with highs reaching up to 29°C (84°F) and lows dropping to around 19°C (67°F).

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

September Precipitation in Alotau

In Alotau in September, the total precipitation amount is 357 mm (14.1 in) spread over 25 days.

September Precipitation Trends in Alotau

The chart displays monthly precipitation patterns in Alotau, 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 Alotau, September typically receives around 357 mm (14.1 inches) of precipitation spread over approximately 25 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 Alotau

In Alotau in September humidity is 80%. With an average temperature of 24°C (76°F), this humidity feels like a warm, sticky embrace that can make exploring outdoors quite draining, so it's essential to stay hydrated and take breaks in the shade while traveling.

September Average Humidity in Alotau

This chart illustrates the average monthly humidity levels in Alotau, 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 Alotau is approximately 80%, 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 Alotau

In Alotau 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 Alotau.

Maximum UV Index Levels in Alotau for September

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

Data source: Alotau 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 Alotau Compares to Other Months

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

This table compares monthly weather conditions in Alotau, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	26°C (80°F)	283 mm (11.1 inches)	80%	extreme
February Weather	27°C (80°F)	306 mm (12.1 inches)	79%	extreme
March Weather	26°C (79°F)	368 mm (14.5 inches)	79%	extreme
April Weather	26°C (79°F)	334 mm (13.1 inches)	81%	extreme
May Weather	25°C (78°F)	218 mm (8.6 inches)	85%	extreme
June Weather	24°C (76°F)	324 mm (12.8 inches)	85%	very high
July Weather	24°C (76°F)	272 mm (10.7 inches)	83%	extreme
August Weather	24°C (75°F)	248 mm (9.8 inches)	82%	extreme
September Weather	24°C (76°F)	357 mm (14.1 inches)	80%	extreme
October Weather	25°C (77°F)	309 mm (12.2 inches)	82%	extreme
November Weather	26°C (78°F)	250 mm (9.8 inches)	81%	extreme
December Weather	26°C (80°F)	243 mm (9.6 inches)	80%	extreme