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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.
Cardinal, Ontario — a St. Lawrence River village near the U.S. line — has a humid continental climate with cold, snowy winters and warm, humid summers. The live forecast above shows today’s conditions, while the seasonal pattern is shaped by the river and the nearby Adirondack foothills.
What’s the outlook for Cardinal this week?
The next seven days will bring a mix of sun and cloud, with temperatures typical for early or late season. For a deeper look at the 14-day trend, check the cardinal weather 14 day forecast. Those planning outdoor trips along the river can also compare conditions with Ottawa weather, which often runs a few degrees cooler. The live forecast above updates minute‑by‑minute for Cardinal.
How does the St. Lawrence influence Cardinal’s weather?
Cardinal sits on the north shore of the St. Lawrence River, just downstream from Lake Ontario. This riverine location moderates temperature extremes in spring and fall, but also feeds lake‑effect clouds in winter. The village is roughly 100 km southwest of Ottawa and follows the same general storm track, though river breezes can make Cardinal feel a touch milder. For broader Ontario patterns, see our Sudbury Ontario Weather and the Canada weather hub.
When does Cardinal typically get its first frost?
First fall frost in Cardinal usually arrives in early October, about a week later than inland towns due to the river’s warmth. The last spring frost often occurs in early May.
Is Cardinal prone to extreme weather?
Severe thunderstorms and occasional tornado watches, but Cardinal is less tornado‑prone than areas farther west. Winter storms can bring heavy snow, but lake‑effect bands are less intense here than near Lake Ontario’s eastern shore.
How does AccuWeather compare with Environment Canada for Cardinal?
Many locals check AccuWeather Cardinal Ontario for hourly precipitation odds, while Environment Canada provides official public alerts. We recommend using both for the most complete picture of cardinal weather for the next 7 days.