January Weather in Castle Hill, Australia

Last updated: August 22, 2025

In January, the average temperature in Castle Hill, Australia is a warm 27°C (82°F). Temperatures can dip as low as 22°C (72°F) and peak at a sizzling 38°C (101°F). Expect 290 mm (11.4 in) of precipitation spread over about 15 days, contributing to an average humidity of 76%. Enjoy the mix of warmth and moisture as you explore this vibrant locale!

January Temperature in Castle Hill

In January in Castle Hill, the average temperature is 27°C (82°F). Maximums can reach 38°C (101°F), while minimums can drop to as low as 22°C (72°F). Travelers should be prepared for warm weather and plan accordingly for both hot days and cooler evenings.

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

The chart illustrates January 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, January typically has an average temperature of 27°C (82°F), with highs reaching up to 38°C (101°F) and lows dropping to around 22°C (72°F).

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

January Precipitation in Castle Hill

In Castle Hill in January, the precipitation amount is 290 mm (11.4 in) over a period of 15 days.

January Precipitation Trends in Castle Hill

The chart displays monthly precipitation patterns in Castle Hill, with values for each month alongside January’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how January’s conditions compare to those of other months. In Castle Hill, January typically receives around 290 mm (11.4 inches) of precipitation spread over approximately 15 days.

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

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Millimeters (mm) Inches (in)

January Humidity in Castle Hill

In Castle Hill in January, humidity is 76%. With an average temperature of 27°C (82°F), this humidity feels like a thick, warm blanket wrapping around you, making outdoor activities feel muggy and requiring frequent hydration breaks for comfort while traveling.

January Average Humidity in Castle Hill

This chart illustrates the average monthly humidity levels in Castle Hill, with January’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In January, average humidity in Castle Hill is approximately 76%, offering insight into how humid the weather typically is during this month.

Data source: Humidity data for January generated using information from the Copernicus Climate Change Service.

January UV Index in Castle Hill

In Castle Hill in January, the maximum UV index is 16, which corresponds to an extreme Exposure Category. The time to burn is just 10 minutes, making it crucial to take protective measures. For detailed information, you can refer to the Hourly UV Index in Castle Hill.

Maximum UV Index Levels in Castle Hill for January

The chart shows the monthly maximum UV Index (UVI) for Castle Hill in January, 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 January, the maximum UV index in Castle Hill typically reaches 16, which falls under the extreme exposure category.

Data source: Castle Hill January 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 January 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 January’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 January’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