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Live forecasts update automatically; written guidance last reviewed 23 June 2026 by the Aussie Brief Weather Desk. Data from the Bureau of Meteorology (BOM) and other national met services via Open-Meteo.
Check the live forecast above before heading out in Castle Hill. The Hills District can feel a few degrees cooler than the city, especially in the evenings, so dress accordingly.
What is the typical weather in Castle Hill?
Castle Hill has a humid subtropical climate with warm summers and mild winters. Summer mean maximum temperatures hover around 28°C, while winter mean minimums drop to about 6°C. Annual rainfall averages 900 millimetres, with most rain falling in late summer and early autumn.
How variable are forecasts for Castle Hill?
Local topography can cause rapid changes, particularly with afternoon thunderstorms in summer. For a reliable outlook, use the Sydney weather page for broader trends, or check weather in castle hill 10 days from the live forecast above. Longer-range forecasts, such as weather castle hill 14 days or castle hill weather forecast 28 days, are useful for planning but become less accurate beyond a week.
When is the best time to visit Castle Hill?
Late spring (October–November) and early autumn (March–April) offer mild temperatures and lower humidity. Avoid the hottest weeks in January and February if you dislike heat.
Does Castle Hill get severe storms?
Yes, especially in summer. Thunderstorms can bring heavy rain, hail and gusty winds. Stay updated with bom weather castle hill alerts and check the Severe Weather Warning page.
How reliable is a 28‑day forecast for Castle Hill?
It gives a general seasonal trend but not day‑by‑day accuracy. For short‑term plans, rely on the live forecast above and weather in castle hill 10 days for higher confidence.