It comes along with a high UV index of 7. It hasn't been 20 C in Ottawa since two days after Thanksgiving, nearly seven months ago. Kingston should juuuust about get there with a high of 19 C, though it will be significantly cooler near Lake Ontario. The overnight low is 5 C, though there's a good chance for the temperature to still be in the double-digits at midnight. Tomorrow's high is also 20 C, with clouds rolling in around noon then a 40 per cent chance of showers that afternoon.

Source: CBC News May 05, 2019 11:25 UTC