September Weather in Onslow, Australia

Last updated: August 22, 2025

In September, the average temperature in Onslow, Australia is a pleasant 24°C (75°F). Expect a range from a cool 12°C (54°F) to a warm 38°C (100°F). With an impressive 0 mm (0.0 in) of precipitation over 0 days, it's a great time to enjoy outdoor activities. The average humidity sits at a comfortable 67%, making for ideal weather conditions.

September Temperature in Onslow

In September in Onslow, the average temperature is 24°C (75°F). The maximum can reach 38°C (100°F), while the minimum can drop as low as 12°C (54°F). Travelers should be prepared for warm days and cooler evenings, making it ideal for a variety of activities.

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

The chart illustrates September temperature patterns in Onslow, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Onslow, September typically has an average temperature of 24°C (75°F), with highs reaching up to 38°C (100°F) and lows dropping to around 12°C (54°F).

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

September Precipitation in Onslow

In Onslow in September, the precipitation amount is 0 mm (0.0 in) during 0 days.

September Precipitation Trends in Onslow

The chart displays monthly precipitation patterns in Onslow, 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 Onslow, September typically receives around 0 mm (0.0 inches) of precipitation spread over approximately 0 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 Onslow

In Onslow in September humidity is 67%. With an average temperature of 24°C (75°F), this humidity feels like a warm and sticky embrace, making traveling a bit uncomfortable as you find yourself seeking shade and refreshing drinks more often.

September Average Humidity in Onslow

This chart illustrates the average monthly humidity levels in Onslow, 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 Onslow is approximately 67%, 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 Onslow

In Onslow in September, the maximum UV index reaches 13, which corresponds to an extreme Exposure Category. With a time to burn of just 10 minutes, it's crucial to take protective measures. For detailed information, you can check the Hourly UV Index in Onslow.

Maximum UV Index Levels in Onslow for September

The chart shows the monthly maximum UV Index (UVI) for Onslow 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 Onslow typically reaches 13, which falls under the extreme exposure category.

Data source: Onslow 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 Onslow Compares to Other Months

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

This table compares monthly weather conditions in Onslow, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	31°C (88°F)	10 mm (0.4 inches)	83%	extreme
February Weather	30°C (87°F)	25 mm (1.0 inches)	82%	extreme
March Weather	31°C (88°F)	37 mm (1.5 inches)	77%	extreme
April Weather	29°C (84°F)	15 mm (0.6 inches)	74%	extreme
May Weather	24°C (76°F)	18 mm (0.7 inches)	68%	very high
June Weather	20°C (69°F)	36 mm (1.4 inches)	64%	high
July Weather	20°C (68°F)	3 mm (0.1 inches)	61%	very high
August Weather	21°C (70°F)	2 mm (0.1 inches)	65%	very high
September Weather	24°C (75°F)	0 mm (0.0 inches)	67%	extreme
October Weather	25°C (78°F)	0 mm (0.0 inches)	74%	extreme
November Weather	27°C (81°F)	2 mm (0.1 inches)	75%	extreme
December Weather	30°C (86°F)	1 mm (0.0 inches)	81%	extreme