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Live forecasts update automatically; written guidance last reviewed 16 June 2026 by the Canada Edition 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’s weather today, as shown in the live forecast above, is shaped by its position north of Toronto and the influence of Lake Ontario. Expect a mix of cloud and sun, with temperatures holding near seasonal norms for early spring.
What’s the outlook for Markham over the next few days?
For those checking the weather in Markham tomorrow, the pattern remains unsettled with a chance of showers as a weak system moves through southern Ontario. The markham weather 14 days outlook suggests a gradual warming trend, though overnight lows will stay cool. For a broader view, the markham weather 30 day forecast points to a typical spring transition, with alternating mild and chilly periods.
How does Lake Ontario affect Markham’s weather?
Markham sits inland from Lake Ontario, but the lake still moderates temperatures, especially in spring and fall. This means cooler afternoons near the lake and slightly warmer nights inland. The markham weather radar often shows lake-effect clouds drifting north, which can keep the sky grey even when Toronto is sunny.
What is the best source for markham weather hourly updates?
Environment and Climate Change Canada provides hourly forecasts for Markham through its regional page. The data updates every hour and includes temperature, wind, and precipitation probability for the next 24 hours.
How accurate is the markham weather 14 days forecast?
Long-range forecasts beyond a week are general trend guides. For Markham, the 14-day outlook is reliable for broad temperature patterns but less so for exact rain timing. Check the markham weather radar for short-term precision.
Does Markham get lake-effect snow in winter?
Yes, Markham can see lake-effect snow bands from Lake Ontario, especially when cold northwesterly winds blow across the lake. Snowfall amounts are typically lighter than areas closer to the shoreline, but accumulations of 5–10 centimetres are possible in a single event.
Sources
For broader conditions across the province, visit the Canada weather hub or check the Toronto Weather page for regional context. Stay alert to any alerts via the Weather Warning page.