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Live forecasts update automatically; written guidance last reviewed 23 June 2026 by the Oz Insight Lab Weather Desk. Data from the Bureau of Meteorology (BOM) and other national met services via Open-Meteo.
Live data from Open-Meteo · updates automatically ·
Thornleigh, in Sydney’s upper north shore, has a mild, humid subtropical climate. The best months to visit are March to May and September to November, when days are warm but not sweltering and rain is less frequent than in summer. Pack layers for cooler evenings and a rain jacket year-round.
What is the weather like in Thornleigh through the year?
Thornleigh sits about 170 metres above sea level, so it can be a degree or two cooler than the Sydney CBD. Summer (December–February) brings average highs around 27–28°C, with occasional afternoon thunderstorms and high humidity. Winter (June–August) is mild and relatively dry, with daytime temperatures around 16–17°C and overnight lows near 6–7°C. Spring and autumn offer the most comfortable conditions for outdoor activities, with lower humidity and clear skies.
When should I visit Thornleigh for value and fewer crowds?
For the best value, plan your trip outside school holidays and the peak summer period. Late autumn (May) and early spring (September–October) offer pleasant weather, lower accommodation rates, and fewer visitors at local parks like Thornleigh Oval or the nearby Berowra Valley National Park. If you’re escaping a colder climate, winter is a reliable option – expect crisp, sunny days perfect for bushwalking without the humidity.
Is Thornleigh weather different from central Sydney?
Yes – because of its higher elevation and distance from the coast, Thornleigh can be slightly cooler at night and less humid than the city centre. It also receives a bit more rainfall during summer storms.
Where can I find a reliable Thornleigh weather 14 day forecast?
The Bureau of Meteorology provides the official 7-day forecast for Thornleigh. For a longer outlook, check our Sydney Weather page, which includes extended trends. Third-party sites like Weatherzone also offer a 14-day forecast.
What’s the best way to check Thornleigh weather radar?
The Bureau of Meteorology’s Sydney radar (located at Terrey Hills) covers Thornleigh well. You can view it live on the BOM website. For hourly updates, Sydney Weather page includes local radar loops.