Summer heat arrives in Toronto following cool end to May
Posted June 2, 2025 8:01 am.
Last Updated June 3, 2025 8:59 am.
Mother Nature is finally giving Toronto residents a taste of summer to kick off the month of June.
Monday was a beautiful start to the week, with sunny skies and a daytime high of 23 °C in Toronto. It will be followed by even warmer temperatures on Tuesday, with a forecasted high of 27 °C and tons of sunshine.
Though initially forecasted to be a washout, Wednesday is now shaping up to be a stunner in Toronto, with an expected high of 28 °C during the day. Environment Canada says winds from the south will start at 20 km/h and gust to 40 km/h late in the morning. There is a 40 per cent chance of showers at nightfall.
Canada’s weather agency says the UV index for Tuesday and Wednesday will be 9. Environment Canada has updated the air quality outlook for Toronto to a 4, indicating the lowest end of moderate risk for the next two days.
Toronto’s long-range forecast isn’t as promising, particularly to cap off the week. Temperatures are slated to drop to 21 °C and 22 °C in Toronto on Thursday and Friday, with rain forecast for both days. Showers could become heavy on Thursday evening, with 5 to 10 mm of accumulation by Friday morning.
Toronto residents welcome June after an unusually cool May
There is a 30 per cent chance of showers on Saturday throughout the day, with a forecasted high of 22 °C. A return to the sunshine will be felt on Sunday.
June, meanwhile, couldn’t have come sooner for many in southern Ontario following an unseasonably cool month of May.
In Toronto, the average daytime temperature in May is approximately 19 °C, with daily highs typically ranging from 17 °C to 20 °C. This year, Toronto experienced an average daytime high temperature of approximately 16.5 °C, with average daily lows around 8.6 °C.
Toronto received approximately 76 mm of total precipitation in May, aligning closely with the city’s monthly historical average. The month featured several rainy periods, particularly in the first half, with notable rainfall on days such as May 1, May 2, May 5, May 6, May 13, and May 14.
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