Waterloo, Ontario is in for some hot and sunny weather today, August 5, 2026. Environment Canada reports that temperatures will climb to 28°C this afternoon, feeling more like 32 with the humidity. There are no weather alerts for the area right now.
At 4:00 PM EDT, the temperature at the Region of Waterloo International Airport was recorded at 28.2°C under sunny skies. A west-southwest wind is blowing at 17 km/h with gusts up to 37 km/h. The UV index for today is forecast to be very high at 9, meaning sun protection is a must.
On very high UV days like this, Environment Canada advises people to limit time in the sun, especially between 11 a.m. and 3 p.m. The agency recommends wearing a hat, UV protective sunglasses, and using a sunscreen with at least SPF 30 that is broad spectrum and water resistant. Today’s humidex of 31 falls into the “some discomfort” range on the official humidex scale.
The weather will start to shift on Thursday. The forecast calls for mainly cloudy skies with a 40 percent chance of afternoon showers and a risk of a thunderstorm. The high will reach 27°C, but it will feel muggier with a humidex of 35. For those making weekend plans, the unsettled pattern continues Friday and Saturday with a 40 to 60 percent chance of showers and highs of 26°C and 25°C.
