Home › Weather › Thornhill Weather
Live forecasts update automatically; written guidance last reviewed 16 June 2026 by the Northern Focus Weather Desk. Data from Environment and Climate Change Canada and other national met services via Open-Meteo.
Live data from Open-Meteo · updates automatically ·
Check the live forecast above to see if today calls for a coat or just a light jacket — Thornhill’s position on the Oak Ridges Moraine means conditions can shift quickly, especially when lake-effect clouds roll in off Lake Ontario.
What makes Thornhill’s weather different from downtown Toronto?
Thornhill sits about 20 kilometres north of the lake, so it often runs a couple of degrees cooler than downtown Toronto, particularly on spring and autumn mornings. The elevation also means you’ll sometimes see snow here while rain falls closer to the shore.
How reliable are thornhill weather 7 days and longer outlooks?
Short-range forecasts (thornhill weather hourly and into tomorrow) are quite dependable thanks to Environment and Climate Change Canada’s high-resolution models. Extended views like a thornhill weather 14 days or thornhill weather 30 days can signal broad trends — say, a warm spell or a cold snap — but smaller details often change after a week.
Does Thornhill get more snow than Toronto?
Yes, typically. The slightly higher elevation and greater distance from Lake Ontario’s warming influence mean Thornhill often picks up an extra 10–20 cm of snow per season compared with downtown Toronto.
What’s the best time to check weather in thornhill tomorrow?
Late afternoon is ideal because forecasters have the freshest model data by then. The evening update on The Weather Network and Environment Canada’s 5 p.m. bulletin give you the most reliable picture for the next morning.
Why does it sometimes feel muggy here in summer?
Thornhill lies in a humid continental zone. Warm, moist air from the Great Lakes and the Gulf of Mexico can push humidity readings above 80%, making July afternoons feel several degrees warmer than the thermometer suggests.
Sources
For broader conditions across the province, visit our Canada weather hub or the Toronto Weather page for region-wide details.