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Live forecasts update automatically; written guidance last reviewed 23 June 2026 by the Oz Reviewly Weather Desk. Data from the Bureau of Meteorology (BOM) and other national met services via Open-Meteo.
Hornsby’s weather this week is shaped by a mix of coastal humidity and western Sydney’s inland heat, with afternoon showers likely on warmer days. The live forecast above shows the current conditions and today’s expected top temperature.
What is the typical weather pattern for Hornsby?
Hornsby sits on the edge of the Sydney basin, so its climate blends coastal moisture from the east with hotter, drier air from the west. Summer afternoons often bring a 30–40% chance of a thunderstorm, while winter mornings can drop to 5–8°C with frost in low-lying areas. The Bureau of Meteorology records an average annual rainfall of around 1,200 millimetres, with February usually the wettest month.
How accurate are extended forecasts for Hornsby?
For a weather in hornsby 10 days outlook, reliability drops after day 7 as weather systems shift over the Blue Mountains. A hornsby weather 14 days forecast gives a general trend, not precise temperatures. The most dependable prediction is the weather in hornsby tomorrow, which models handle well. For long-term planning, a hornsby weather 30 day forecast shows broad climate patterns, not day-by-day accuracy.
Does Hornsby get fog in winter?
Yes. Hornsby’s valleys and bushland trap moisture on calm winter mornings, creating patchy fog that usually clears by mid-morning. Visibility can drop below 200 metres, so drive carefully on the Pacific Highway.
When is the best time to visit Hornsby for outdoor activities?
March to May and September to November offer mild temperatures (18–25°C) and lower humidity. These shoulder seasons have fewer storms than summer and less rain than winter, making them ideal for walking in Hornsby Ku-ring-gai National Park.
How does Hornsby’s weather compare to the Sydney CBD?
Hornsby is typically 2–4°C cooler than the Sydney CBD in summer due to its higher elevation and tree cover. In winter, it can be 3–5°C colder overnight, with frost more common in suburban backyards.
Sources
For broader conditions, check the Sydney Weather page or visit the Australia weather hub. If storms are forecast, see our Severe Weather Warning page.