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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.
Kingston’s weather is moulded by Lake Ontario, which keeps winters less severe and summers slightly cooler than inland towns. The live forecast above shows today’s conditions; for this time of year, expect crisp mornings, variable cloud, and a chance of lake-effect flurries.
What defines Kingston’s climate?
Kingston sits at the eastern end of Lake Ontario, giving it a humid continental climate with lake moderation. Winters are cold but not as harsh as Ottawa’s, with average January highs near –3°C. Summers are warm and humid, with July highs around 26°C, but the lake often sends cooler breezes along the waterfront. Spring and autumn are transitional, with rapid temperature shifts and frequent cloud cover from passing systems.
How does lake-effect snow affect Kingston?
When cold air moves over the still-unfrozen lake, it picks up moisture and dumps snow on the downwind shore. Kingston lies directly in that path, so it can see sudden, heavy snow squalls – sometimes 5–10 cm in a few hours – while areas just a few kilometres inland stay dry. These events are most common from November through January, before the lake freezes over. The city’s snow total averages around 150 cm per season.
Is Kingston’s weather really milder than Ottawa’s?
Yes. Lake Ontario keeps Kingston’s winter lows about 3–5°C warmer than Ottawa’s on average. In summer, the lake also delays the arrival of extreme heat, though humidity can make it feel muggy.
When is the best time to visit Kingston?
Late May to early October offers the most reliable dry, warm weather. July and August are peak tourist months, but September often delivers calm, sunny days with fewer crowds and lower humidity.
Does Kingston get fog?
Yes, especially in spring and autumn when the lake is warmer or cooler than the air. Radiation fog also forms on clear, calm nights in low-lying areas near the water, lifting by late morning.
Sources
For more Ontario city forecasts, see the Canada Weather Hub or check Ottawa Weather for nearby conditions.