September Weather in Casterton, Australia

Last updated: August 22, 2025

In September, the average temperature in Casterton, Australia hovers around 10°C (51°F), with a minimum of -2°C (29°F) and a maximum soaring up to 27°C (81°F). Expect 66 mm (2.6 in) of precipitation spread over 13 days, while the average humidity remains around 69%. Enjoy the diverse weather!

September Temperature in Casterton

In September in Casterton, the average temperature is 10°C (51°F). Maximums can reach 27°C (81°F) and minimums can be as low as -2°C (29°F). Be prepared for fluctuating temperatures and pack layers to enjoy your trip comfortably.

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

The chart illustrates September temperature patterns in Casterton, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Casterton, September typically has an average temperature of 10°C (51°F), with highs reaching up to 27°C (81°F) and lows dropping to around -2°C (29°F).

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

September Precipitation in Casterton

In Casterton in September, the total precipitation amount is 66 mm (2.6 in) spread over the course of 13 days.

September Precipitation Trends in Casterton

The chart displays monthly precipitation patterns in Casterton, 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 Casterton, September typically receives around 66 mm (2.6 inches) of precipitation spread over approximately 13 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 Casterton

In Casterton in September humidity is 69%. With an average temperature of 10°C (51°F), this humidity feels like a damp chill that can make outdoor activities uncomfortable, so it's advisable to dress in layers and plan for indoor attractions to fully enjoy your time.

September Average Humidity in Casterton

This chart illustrates the average monthly humidity levels in Casterton, 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 Casterton is approximately 69%, 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 Casterton

In Casterton in September, the maximum UV index is 7, which corresponds to the high Exposure Category. This means that the time to burn is approximately 25 minutes. For more detailed information, you can check the Hourly UV Index in Casterton.

Maximum UV Index Levels in Casterton for September

The chart shows the monthly maximum UV Index (UVI) for Casterton 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 Casterton typically reaches 7, which falls under the high exposure category.

Data source: Casterton 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 Casterton Compares to Other Months

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

This table compares monthly weather conditions in Casterton, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	20°C (68°F)	26 mm (1.0 inches)	45%	extreme
February Weather	18°C (65°F)	23 mm (0.9 inches)	49%	extreme
March Weather	18°C (64°F)	23 mm (0.9 inches)	57%	extreme
April Weather	14°C (58°F)	37 mm (1.5 inches)	67%	high
May Weather	11°C (52°F)	67 mm (2.7 inches)	75%	moderate
June Weather	9°C (48°F)	44 mm (1.7 inches)	79%	moderate
July Weather	8°C (47°F)	73 mm (2.9 inches)	80%	moderate
August Weather	9°C (48°F)	73 mm (2.9 inches)	75%	moderate
September Weather	10°C (51°F)	66 mm (2.6 inches)	69%	high
October Weather	12°C (55°F)	63 mm (2.5 inches)	59%	very high
November Weather	15°C (60°F)	57 mm (2.3 inches)	56%	extreme
December Weather	17°C (63°F)	35 mm (1.4 inches)	50%	extreme