September Weather in Castle Hill, Australia

Last updated: August 22, 2025

In September, the average temperature in Castle Hill, Australia is a delightful 22°C (73°F). However, be prepared for a range, as temperatures can dip to a cool 11°C (52°F) or rise to a warm 33°C (91°F). During this month, expect approximately 12 mm (0.5 in) of precipitation over 3 days, complemented by an average humidity of 61%. Enjoy the varied climate!

September Temperature in Castle Hill

In September in Castle Hill, the average temperature is 22°C (73°F), with maximums reaching up to 33°C (91°F) and minimums dipping as low as 11°C (52°F). This range makes it an ideal time for travelers to explore and enjoy outdoor activities comfortably.

September Weather in Castle Hill: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Castle Hill, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Castle Hill, September typically has an average temperature of 22°C (73°F), with highs reaching up to 33°C (91°F) and lows dropping to around 11°C (52°F).

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

September Precipitation in Castle Hill

In Castle Hill in September, the precipitation amount is 12 mm (0.5 in) during a span of 3 days.

September Precipitation Trends in Castle Hill

The chart displays monthly precipitation patterns in Castle Hill, 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 Castle Hill, September typically receives around 12 mm (0.5 inches) of precipitation spread over approximately 3 days.

Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.

Choose your preferred precipitation unit

Millimeters (mm) Inches (in)

September Humidity in Castle Hill

In Castle Hill in September humidity is 61%. With an average temperature of 22°C (73°F), this humidity feels like a warm embrace, making traveling a delightful experience, as the air wraps around you with a gentle, tropical flair, creating the perfect atmosphere for exploration and adventure.

September Average Humidity in Castle Hill

This chart illustrates the average monthly humidity levels in Castle Hill, 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 Castle Hill is approximately 61%, 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 Castle Hill

In Castle Hill 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 Castle Hill.

Maximum UV Index Levels in Castle Hill for September

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

Data source: Castle Hill 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 Castle Hill Compares to Other Months

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

This table compares monthly weather conditions in Castle Hill, 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 (82°F)	290 mm (11.4 inches)	76%	extreme
February Weather	28°C (82°F)	299 mm (11.8 inches)	78%	extreme
March Weather	27°C (81°F)	228 mm (9.0 inches)	81%	extreme
April Weather	25°C (78°F)	64 mm (2.5 inches)	76%	extreme
May Weather	22°C (73°F)	53 mm (2.1 inches)	72%	very high
June Weather	20°C (68°F)	21 mm (0.8 inches)	71%	high
July Weather	20°C (68°F)	16 mm (0.6 inches)	63%	very high
August Weather	21°C (70°F)	12 mm (0.5 inches)	67%	extreme
September Weather	22°C (73°F)	12 mm (0.5 inches)	61%	extreme
October Weather	25°C (77°F)	30 mm (1.2 inches)	62%	extreme
November Weather	26°C (80°F)	42 mm (1.7 inches)	63%	extreme
December Weather	28°C (82°F)	127 mm (5.0 inches)	69%	extreme