Home › Weather › Weather Forecast Markham
Live forecasts update automatically; written guidance last reviewed 16 June 2026 by the Canada Perspective Weather Desk. Data from Environment and Climate Change Canada and other national met services via Open-Meteo.
Live data from Open-Meteo · updates automatically ·
Markham, north of Toronto and well inland from Lake Ontario, will follow the live forecast above today. The region’s typical mix of lake-influenced cloud and continental air keeps conditions variable through the week.
What is driving Markham’s weather pattern right now?
A broad ridge of high pressure over the Great Lakes is giving way to a trough moving east from Manitoba. For Markham this means a few days of seasonable temperatures followed by a chance of rain or wet snow as the system arrives late in the week. The lack of a strong lake breeze today keeps daytime highs near the forecast value, with overnight lows dipping a couple degrees below freezing.
When should residents expect the next change?
By Thursday afternoon a cold front will push across southern Ontario, bringing gusty southwest winds and a period of precipitation. Given Markham’s elevation and distance from the lake, the rain-snow line may hover near the city – be alert for a brief mix of wet flakes or ice pellets before temperatures fall. Conditions clear by Friday, with a return to drier, cooler air for the weekend.
Does Lake Ontario affect Markham’s weather much?
Markham sits about 30 kilometres north of Lake Ontario. In spring and autumn the lake can hold heat, delaying frost and moderating daytime highs compared to areas farther north. However, it rarely produces lake-effect snow for Markham because the prevailing winds typically push bands south of the city.
Is there a risk of freezing rain this week?
Brief freezing rain or ice pellets are possible with the Thursday system if a warm layer aloft overrides cold surface air. The probability is low (~20%) given the expected temperature profile, but Markham residents should watch the live forecast and any special weather statements from Environment Canada.
How does Markham compare to downtown Toronto?
Toronto’s lakefront stays slightly warmer on winter nights due to urban heat and open water. Markham, being inland and at a slightly higher elevation, often sees colder overnight lows and more snow accumulation during storms. Daytime highs are usually within a degree or two of Toronto’s inland neighbourhoods.