Latest ensemble forecasts from Environment and Climate Change Canada and the European Centre for Medium-Range Weather Forecasts indicate Toronto’s May 17 maximum temperature will most likely settle between 24°C and 26°C. A building ridge of high pressure is promoting daytime heating under mostly sunny skies, yet modest uncertainty arises from variable afternoon cloud build-up and light southwesterly flow off Lake Ontario that can suppress peak readings by 1–2°C. Model spread centers on the exact timing and strength of this moderation, producing closely matched market probabilities across the 24–26°C outcomes. Historical May maxima average near 18–20°C, so any confirmation of the current warm anomaly would represent a notable departure driven by the ongoing high-pressure pattern.