|With a daytime high of 34 C, today will mark the hottest July 5 in Toronto since 1999. Humidity is nudging the mercury ever higher.|
Overnight lows will be near 20 degrees, providing little relief. A heat warning was issued Monday by Environment Canada, and remains in effect for Toronto, Vaughan, Richmond Hill, Mississauga, Markham, Oshawa and Hamilton. The UV index is at 9, which is very high. The rest of the week promises no respite.