Castle Hill Weather & Climate: Best Time to Visit
Average temperatures, rainfall, sunshine and the best time to visit Castle Hill.
Climate overview of Castle Hill
Castle Hill, New South Wales, Australia, experiences moderate temperature changes through the seasons. January is the warmest month with daytime highs of 29°C (84°F), while July is the coolest at 19°C (66°F).
The city receives around 726 mm (29 in) of rainfall per year. It experiences a distinct dry season from July to August, with warm summers and pleasant winters. February is the wettest month and July the driest. The most sunshine falls in December, with an average of 8.6 hours of daily sunshine.
Castle Hill Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Castle Hill - and find the best time to visit.
Monthly Temperature in Castle Hill
The climate in Castle Hill experiences moderate temperature changes, with mild shifts between seasons. On average, daytime temperatures range from a comfortable 29°C (84°F) in January to a pleasant 19°C (66°F) in July.
Nighttime temperatures range from 19°C (66°F) in January to 6°C (43°F) in July.
Check out our detailed temperature page for more information.
Temperature ranges by month
Rainfall in Castle Hill
Generally, Castle Hill has a moderate amount of precipitation, averaging 726 mm (29 in) of rainfall annually. The seasons in Castle Hill bring significant changes in precipitation. The wettest month, February, receives high rainfall, with an average of 100 mm (3.9 in) of precipitation. This rainfall is distributed across 12 rainy days.
In contrast, the driest month, July, experiences much less rainfall, totaling 37 mm (1.5 in) over 8 rainy days. These distinct seasonal differences provide diverse experiences throughout the year. For more details, please visit our Castle Hill Precipitation page.
The mean monthly precipitation over the year, including rain, hail, and snow
The average number of days each month with precipitation
Sunshine Hours in Castle Hill
Castle Hill enjoys sunny spells year-round. December sees up to 8.6 hours of daily sunshine, perfect for a sunny trip. May, the least sunny month, still offers a generous 6.0 hours of sun despite this cloudier time of the year.
Visit our detailed sunshine hours page for more information.
Monthly hours of sunshine
Daily hours of sunshine
Daily percentage of sunshine
Humidity in Castle Hill by Month
The relative humidity is moderate throughout the year in Castle Hill.
The city experiences its highest humidity in February, reaching 62%. In August, the humidity drops to its lowest level at 48%. What does this mean? Read our detailed page on humidity levels for further details.
Relative humidity over the year
Best Time to Visit Castle Hill
Monthly ratings reflect general weather comfort, based on daytime temperature and rainfall. Swimming and winter conditions are highlighted separately where relevant.
- Best overall: January, March, April, May, August, September, October, November and December
- Warmest weather: January, February and December
- Most sunshine: October and December
- Fewest rainy days: July, August, September and December
- Seasonal pattern: A distinct dry season from July to August, with warm summers and pleasant winters
Frequently asked questions about the climate in Castle Hill
What is the best time to visit Castle Hill?
January, March, April, May, August, September, October, November and December typically offer the most optimal weather in Castle Hill. In contrast, February, June and July tend to have less optimal conditions. Castle Hill has a distinct dry season from July to August, with warm summers and pleasant winters.
What temperatures can I expect in Castle Hill?
Daytime highs range from 19°C (66°F) in July to 29°C (84°F) in January. Nighttime lows range from 6°C (43°F) to 19°C (66°F).
How much rain does Castle Hill get?
Annual rainfall is around 726 mm (29 in). February is the wettest month with 100 mm (3.9 in), while July is the driest with 37 mm (1.5 in).
How sunny is Castle Hill?
Castle Hill receives around 2,644 hours of sunshine per year. December is the sunniest month with 257 hours, while May is the cloudiest with just 180 hours. Overall, Castle Hill enjoys abundant sunshine.
Castle Hill 3-Day Forecast
Castle Hill 3-Day Forecast
Castle Hill on the map
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