A heat wave that gripped Waterloo region ends with rain Thursday. Weekend to bring mid-20s temperatures before heat returns early next week.
Sudden Shift in Weather Brings Relief
After several days of sweltering temperatures, residents in Waterloo Region, Guelph, and Wellington County finally saw relief Thursday morning as rain and thunderstorms swept through the area. The brief downpour marked the end of a heat wave that pushed temperatures as high as 34°C, with humidex values nearing 42°C.
Heat Warning Issued by Federal Agency
Earlier in the week, Environment and Climate Change Canada had issued a heat warning for southwestern Ontario. The alert cautioned that the region would face extreme daytime heat and minimal overnight cooling. The combination of high temperatures and humidity posed a significant risk for heat-related illnesses.
Rain Cools the Region on Thursday
Rainfall began early Thursday morning and continued through parts of the day, helping to break the heat wave. According to the national weather agency, even areas that did not receive rain experienced cooler conditions as a cold front moved into the region.
“Showers and thunderstorms moving through Thursday morning are expected to keep daytime temperatures relatively cooler for most regions,” the agency noted in its advisory.
Mild Weekend Ahead
The upcoming weekend promises more comfortable and seasonable conditions. Daytime highs are forecasted to remain in the mid-20s:
- Friday: Sunny with a high of 24°C
- Saturday: Partly cloudy with a chance of showers, high of 25°C
- Sunday: Similar mix of sun and clouds with light showers possible, high near 26°C
These temperatures reflect the seasonal average, offering a short-lived reprieve from the heat.
Temperatures to Rise Again by Monday
Looking ahead, temperatures are expected to climb once more by early next week. Monday’s forecast predicts highs in the upper 20s with humid conditions likely returning by midweek. Meteorologists advise residents to remain prepared for another heat event.
Public Urged to Stay Safe During Heat Events
As hot conditions are likely to return, health officials continue to urge precautions: stay hydrated, avoid strenuous activities during peak heat, seek shaded or air-conditioned areas, and watch for symptoms of heat exhaustion such as dizziness, nausea, and fatigue. Vulnerable populations—including seniors, young children, and outdoor workers—are especially at risk.
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