Waterloo residents can expect a shift in the weather beginning Tuesday, July 21, 2026, with showers and a risk of thunderstorms moving into the region. After a sunny and warm start to the week, Environment Canada is forecasting unsettled conditions to develop overnight, with a high chance of rain and gusty winds through the morning and early afternoon Tuesday.
Monday will be sunny with a high of 25°C, a Humidex of 28, and a very high UV index of 9. Winds are expected to become southwest at 20 km/h later in the afternoon. But the comfortable conditions are not expected to last, as a weather system moves in from the west.
According to Environment Canada, Tuesday brings showers with a risk of thunderstorms, especially during the morning and early afternoon. Southwest winds of 30 km/h gusting to 50 km/h will accompany the system, and the temperature will reach a high of 23°C with a Humidex of 31. The hourly forecast shows an 80 percent chance of showers with a risk of thunderstorms between 6:00 a.m. and 11:00 a.m., when wind gusts could reach 40 to 50 km/h.
No weather alerts are currently in effect for the Kitchener-Cambridge-Waterloo area, but residents are encouraged to stay aware of changing conditions. The hourly forecast indicates the thunderstorm risk is highest during the morning hours on Tuesday.
Looking ahead, Wednesday will bring a mix of sun and cloud with a 30 percent chance of showers and a high of 20°C. Sunny conditions return Thursday and Friday with highs of 25°C and 26°C. The weekend is expected to be a mix of sun and cloud on Saturday with a high of 26°C, while Sunday may see cloudy skies and a 30 percent chance of showers with a high of 25°C.
This unsettled pattern follows an active severe weather season in Waterloo Region, which has already seen multiple thunderstorm watches and warnings this summer, including a risk of tornadoes in late June. Residents planning outdoor activities should apply sunscreen during sunny periods and monitor local forecasts for updates.
