January Weather in Hornsby, Australia

Last updated: August 22, 2025

In January, the average temperature in Hornsby, Australia is a pleasant 24°C (76°F). However, temperatures can range significantly, with a minimum of 12°C (54°F) and soaring up to a maximum of 45°C (114°F). Expect some rain, as precipitation averages 37 mm (1.5 in) over 9 days, and enjoy the moderate 65% humidity that adds to the region's charm.

January Temperature in Hornsby

In January in Hornsby, the average temperature is 24°C (76°F). Maximums can reach 45°C (114°F), and minimums can be as low as 12°C (54°F). Travelers should be prepared for a wide temperature range and pack accordingly.

January Weather in Hornsby: Daily Temperature Highs, Lows, and Averages

The chart illustrates January temperature patterns in Hornsby, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Hornsby, January typically has an average temperature of 24°C (76°F), with highs reaching up to 45°C (114°F) and lows dropping to around 12°C (54°F).

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

January Precipitation in Hornsby

In Hornsby in January, the precipitation amount is 37 mm (1.5 in) over a span of 9 days.

January Precipitation Trends in Hornsby

The chart displays monthly precipitation patterns in Hornsby, 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 Hornsby, January typically receives around 37 mm (1.5 inches) of precipitation spread over approximately 9 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 Hornsby

In Hornsby in January, humidity is 65%. With an average temperature of 24°C (76°F), this humidity feels like a warm, enveloping blanket—it can make outdoor activities a bit sticky, necessitating plenty of hydration breaks and perhaps a leisurely pace while touring.

January Average Humidity in Hornsby

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

In Hornsby in January, the maximum UV index is 14, which corresponds to an extreme Exposure Category. The time to burn is just 10 minutes, so it's crucial to take precautions. For the detailed hourly UV index in Hornsby, you can check here.

Maximum UV Index Levels in Hornsby for January

The chart shows the monthly maximum UV Index (UVI) for Hornsby 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 Hornsby typically reaches 14, which falls under the extreme exposure category.

Data source: Hornsby 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 Hornsby Compares to Other Months

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

This table compares monthly weather conditions in Hornsby, showing how January’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	24°C (76°F)	37 mm (1.5 inches)	65%	extreme
February Weather	23°C (74°F)	107 mm (4.2 inches)	69%	extreme
March Weather	21°C (70°F)	153 mm (6.0 inches)	72%	extreme
April Weather	18°C (65°F)	29 mm (1.1 inches)	75%	very high
May Weather	15°C (59°F)	42 mm (1.7 inches)	74%	moderate
June Weather	12°C (54°F)	44 mm (1.7 inches)	72%	moderate
July Weather	12°C (53°F)	40 mm (1.6 inches)	68%	moderate
August Weather	13°C (55°F)	34 mm (1.3 inches)	67%	high
September Weather	16°C (60°F)	36 mm (1.4 inches)	63%	very high
October Weather	18°C (65°F)	67 mm (2.6 inches)	55%	very high
November Weather	20°C (68°F)	77 mm (3.0 inches)	57%	extreme
December Weather	22°C (72°F)	76 mm (3.0 inches)	68%	extreme