CatIQ puts initial insured loss from early-September southern Ontario storms at C$563m

Severe storms across southern Ontario on 2 and 3 September 2026 caused an insured industry loss of C$563m, according to an initial estimate from Canadian catastrophe loss index provider CatIQ, Artemis reported on 8 October. The estimate covers commercial and residential property claims and motor claims, including additional loss adjustment expenses.

Average personal and auto claims are currently lower than for the 2024 flooding, according to the report. Artemis noted that the C$563m figure is only an initial estimate and that there is a chance of some creep over the coming weeks and months. The report gave no date for the next update.

The storms brought large hail, strong gusts and heavy rain to a wide area between Windsor and Ottawa, with several confirmed tornadoes and downbursts. Toronto was among the worst-hit places, with hail the size of ping pong balls.