September Weather in Collinsville, Australia

Last updated: August 22, 2025

In Collinsville, Australia, the average temperature for September is a pleasant 21°C (71°F). Expect fluctuations with minimums dropping to 6°C (44°F) and maximums peaking at 34°C (94°F). Fortunately, the month sees a light precipitation of only 13 mm (0.5 in) spread over 0 days, and the average humidity hovers around 65%. Enjoy the comfortable climate!

September Temperature in Collinsville

In September in Collinsville, the average temperature is 21°C (71°F). Maximum temperatures can reach 34°C (94°F), while minimums can drop as low as 6°C (44°F). This weather makes Collinsville an ideal destination for travelers seeking pleasant temperatures, but also a reminder to prepare for a range of conditions.

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

The chart illustrates September temperature patterns in Collinsville, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Collinsville, September typically has an average temperature of 21°C (71°F), with highs reaching up to 34°C (94°F) and lows dropping to around 6°C (44°F).

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

September Precipitation in Collinsville

In Collinsville in September, the precipitation amount is 13 mm (0.5 in) over a period of 0 days.

September Precipitation Trends in Collinsville

The chart displays monthly precipitation patterns in Collinsville, 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 Collinsville, September typically receives around 13 mm (0.5 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 Collinsville

In Collinsville in September humidity is 65%. With an average temperature of 21°C (71°F), this humidity feels like a warm, enveloping blanket, making outdoor activities pleasant yet requiring occasional breaks in the shade to stay comfortable while exploring.

September Average Humidity in Collinsville

This chart illustrates the average monthly humidity levels in Collinsville, 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 Collinsville is approximately 65%, 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 Collinsville

In Collinsville 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 Collinsville.

Maximum UV Index Levels in Collinsville for September

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

Data source: Collinsville 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 Collinsville Compares to Other Months

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

This table compares monthly weather conditions in Collinsville, 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 (81°F)	154 mm (6.1 inches)	73%	extreme
February Weather	27°C (81°F)	172 mm (6.8 inches)	77%	extreme
March Weather	26°C (80°F)	138 mm (5.4 inches)	80%	extreme
April Weather	24°C (75°F)	46 mm (1.8 inches)	76%	extreme
May Weather	21°C (70°F)	51 mm (2.0 inches)	72%	very high
June Weather	18°C (65°F)	14 mm (0.6 inches)	71%	high
July Weather	18°C (65°F)	11 mm (0.4 inches)	63%	very high
August Weather	19°C (66°F)	12 mm (0.5 inches)	71%	extreme
September Weather	21°C (71°F)	13 mm (0.5 inches)	65%	extreme
October Weather	25°C (77°F)	26 mm (1.0 inches)	64%	extreme
November Weather	26°C (79°F)	35 mm (1.4 inches)	66%	extreme
December Weather	27°C (82°F)	95 mm (3.7 inches)	70%	extreme