Home › Weather › Thornleigh Weather
Live forecasts update automatically; written guidance last reviewed 23 June 2026 by the Australia Current Weather Desk. Data from the Bureau of Meteorology (BOM) and other national met services via Open-Meteo.
Live data from Open-Meteo · updates automatically ·
If you’re heading out in Thornleigh today, expect the conditions shown in the live forecast above to set the tone for your plans. That reading comes straight from the Bureau of Meteorology’s nearest observation point and gives you a reliable snapshot of what’s happening right now in this upper North Shore suburb.
What’s driving Thornleigh’s weather this week?
Thornleigh sits in a valley off the Hornsby Plateau, which means it can be a few degrees cooler than the Sydney basin floor, especially on clear winter nights. The same topography funnels easterly sea breezes up the Lane Cove River corridor, so afternoons often feel fresher than Sydney weather readings at Observatory Hill would suggest. For the next few days, the pattern looks typical of late spring: morning cloud burning off to a partly sunny afternoon, with a low chance of a shower as a trough stalls over the ranges. Keep an eye on the thornleigh weather radar if you’re planning outdoor work – that trough can pop a quick storm without much warning.
How does Thornleigh compare to nearby suburbs?
Because of its elevation (around 190 metres above sea level), Thornleigh often sees cooler minimums than Penrith weather, which bakes on the western plains. Maximums here are also a touch milder than Penrith’s, but humidity can feel heavier when the breeze drops. If you’re checking the thornleigh weather 14 day forecast, bear in mind that longer-range models tend to smooth out these local quirks – the raw BOM data is your most reliable source.
Does Thornleigh get much fog in winter?
Yes – the valley setting traps cool air and moisture, so fog is common on winter mornings, especially after rain. It usually clears by mid-morning once the sun gets high enough. Allow extra travel time if you’re heading down the Pacific Highway before 9 am.
Is the thornleigh weather hourly forecast accurate for planning a barbecue?
Generally yes, for the next 6–12 hours. The BOM’s hourly update captures afternoon sea-breeze shifts and afternoon shower timing. For a weekend barbecue, check the morning update – that’s when forecasters have the freshest satellite and radar data.
How does Thornleigh’s rainfall compare with Melbourne weather averages?
Thornleigh gets roughly double Melbourne’s annual rainfall – about 1,100 mm versus Melbourne’s 600 mm. Most of that falls in summer and autumn from east-coast lows and thunderstorms, while Melbourne’s rain is more evenly spread, often as drizzle from westerly fronts.