Home › Weather › Kingston Ont Weather
Live forecasts update automatically; written guidance last reviewed 16 June 2026 by the Toronto Post Weather Desk. Data from Environment and Climate Change Canada and other national met services via Open-Meteo.
Kingston Ont weather today calls for daytime highs in the low twenties Celsius with a 40% chance of late-afternoon showers, per the live forecast above. This means a mild but unsettled afternoon, with clearing skies expected overnight and a low near 12°C.
What will the rest of the week look like?
The pattern shifts to cooler, lake-influenced air by midweek. Highs will drop to the mid-teens, and a northwesterly wind off Lake Ontario will bring gusty conditions and a chance of lake-effect cloud cover. Overnight lows will fall to about 8°C.
How does Lake Ontario affect Kingston’s weather?
The lake moderates extremes: spring and autumn are cooler near the shore, while winter temperatures are often several degrees milder than inland areas. In summer, lake breezes can reduce afternoon heat and trigger localized thunderstorms.
Why is Kingston’s weather so changeable?
Kingston sits at the confluence of the Great Lakes and the St. Lawrence River, making it subject to competing air masses. Cold fronts from the north and moist air from the lake produce rapid shifts in cloud, wind and precipitation.
When is the best time for outdoor activities in Kingston?
Late May through early September offers the most reliable warm, dry weather. July average highs reach 26°C, though lake breezes can keep the shoreline several degrees cooler than inland areas.
Is fog common in Kingston?
Yes, especially in autumn and early winter. Warm lake water evaporates into cooler air, creating dense fog that can reduce visibility to less than 200 metres along the waterfront and major highways.
For broader conditions across the province, visit our Canada weather hub or check the Ottawa weather page for a nearby regional outlook.