By Adan Helmer, Ottawa Citizen, September 22, 2017 
Ottawa and area residents headed for beaches and splash pads and plain old backyard sprinklers Saturday as the region embarked on a definitely un-fall-like heat wave.
A stretch of unseasonably hot and humid weather has meteorologists issuing a heat warning, with summer-like humidex values expected to peak at 40 degrees for the first weekend of fall.
Environment Canada issued a heat warning Friday afternoon, with “unseasonably warm temperatures” expected to hit 30 degrees Celsius while the humidity will make it feel more like 40 degrees. The late-arriving heat wave, after a cool and wet summer, is expected to persist into next week.
http://ottawacitizen.com/news/local-news/extreme-heat-warning-issued-as-humidex-set-to-reach-40-degrees