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Live forecasts update automatically; written guidance last reviewed 16 June 2026 by the Canada Scope Weather Desk. Data from Environment and Climate Change Canada and other national met services via Open-Meteo.
Newmarket, Ontario, experiences a humid continental climate, and the live forecast above shows the current conditions for today. The key takeaway is that this region sees warm, humid summers and cold, snowy winters, with significant temperature swings between seasons.
What is the typical weather pattern in Newmarket?
Newmarket sits north of Toronto, which means it often gets slightly cooler temperatures and more snow than the city core. Winters average around -6°C, with frequent lake-effect snow from Georgian Bay. Summers are warm, averaging 21°C, but humidity can make July and August feel muggy. Spring and fall are short transition seasons with variable weather.
How do I plan for Newmarket weather day to day?
Check the live forecast above for the immediate outlook, but for longer planning, the 30 day weather forecast Newmarket from Environment Canada gives a general trend, though accuracy drops after a week. For a more detailed look, the weather network Newmarket 14 days provides a reliable day-by-day breakdown. Hourly updates are best for knowing when rain or snow will start or stop.
Does Newmarket get extreme heat or cold alerts?
Yes. Environment Canada issues heat warnings when humidex values hit 40 or higher, and extreme cold warnings when wind chills drop below -30°C. Always check the live forecast above for active warnings.
Is the weather in Newmarket different from Toronto?
Newmarket is about 5–6°C cooler in winter due to its northern location and less urban heat island effect. It also receives more lake-effect snow. Summer temperatures are similar, but Newmarket can be slightly cooler at night.
Where can I find the most accurate hourly forecast for Newmarket?
The weather Newmarket Ontario hourly data is best sourced from Environment and Climate Change Canada’s official site, which updates every hour. The Weather Network also offers a user-friendly hourly breakdown for mobile use.
Sources
For broader conditions across the country, visit our Canada weather hub. If you are comparing conditions to southern Ontario, see the Toronto Weather page.