Heavy rain causes widespread flooding in southern Ontario


Significant rainfall caused widespread flooding in southern Ontario. The heavy rain began on Tuesday and is still falling across portions of central and eastern Ontario today.


A local state of emergency has been declared in Middlesex County.


Strong winds also brought down trees and power lines on Wednesday.


Here is a summary of rainfall totals received by Environment Canada as of 10:00 a.m. on Thursday, September 23.

  • Petrolia 152 mm

  • Meaford 131.6 mm

  • Aurora 130 mm

  • Strathroy 124 mm

  • Trenton 121.4 mm

  • London Airport 120 mm

  • Collingwood 116.3 mm

  • Markdale 116.3 mm

  • Listowel 113.3 mm

  • Glencoe 112 mm

  • Windsor 111.8 mm

  • Monkton 109.2 mm

  • Belle River 108 mm

  • Mount Forest 105.9 mm

  • Heidelberg 105.6 mm

  • St. Marys 104.4 mm

  • Durham 102.4 mm

  • Waterloo 99.8 mm

  • Newmarket 96 mm

  • Windsor Airport 94 mm

  • Sarnia Airport 92.3 mm

  • Alongquin Park (East Gate) 92.1 mm

  • Parry Sound 90.4 mm

  • Vaughan 90 mm

  • Bancroft 89.3 mm

  • Pembroke 88.7 mm

  • Grimsby Mountain 87.7 mm

  • St. Thomas 81.8 mm

  • Ridgetown 81 mm

  • Beatrice 81 mm

  • Waterloo-Wellington Airport 79.8 mm

  • Cantley (near Gatineau) 78 mm

  • Goderich 76.8 mm

  • Elora 73.8 mm

  • Muskoka Airport 75.7 mm

  • Peterborough 73.4 mm

  • Peterborough Trent 71.5 mm

  • Oshawa Airport 71 mm

  • Toronto 45 to 70 mm

  • Petawawa 69.5 mm

  • Mississauga 67.6 mm

  • Wiarton 67 mm

  • Whitby 66.5 mm

  • Borden 64.5 mm

  • Delhi 62.6 mm

  • Toronto Pearson International Airport 62 mm

  • Chatham 61.9 mm

  • Egbert 56.4 mm

  • Hamilton RBG 55.3 mm

  • Vineland 53.6 mm

  • Trenton 53 mm

  • Barrie 50.8 mm

  • Ottawa 40 to 48 mm


Peak wind gusts

  • Sarnia Airport 93 km/h

  • Wiarton Airport 76 km/h

  • Sudbury Airport 76 km/h


Data Source: Environment and Climate Change Canada