Kingston, Ontario, is in for a comfortable stretch of late-September weather this week, with daytime highs near seasonal norms and plenty of sunshine, according to Environment Canada.
The federal weather agency’s 7-day forecast for the Kingston area calls for daytime highs between 16°C and 21°C through Sunday, close to the normal maximum of 19°C for this time of year. No weather alerts are in effect.
Wednesday and Friday are expected to be the sunniest days, with clear skies and highs of 19°C and 21°C respectively. Saturday will also be sunny with a high of 20°C. Tuesday and Thursday will see a mix of sun and cloud with highs of 17°C and 19°C.
Night-time temperatures will be cool, dropping as low as 6°C Monday night and 7°C Tuesday night. Residents with temperature-sensitive plants may want to cover them or bring them indoors, as the risk of frost has already begun for Kingston. Gardeners typically see their first frost by early October, according to frost date data.
The mild conditions are part of a broader trend for fall 2026. An exceptionally strong El Niño is expected to deliver an extended fall across Canada with fewer cold snaps and a delayed start to winter, according to The Weather Network. For Kingston, that could mean more opportunities to enjoy fall colours and outdoor activities through October and November, though frosty nights remain normal.
