Ontario

Waterloo Faces Thunderstorm Risk and Showers This Week

By

boringnews
August 17, 2026 1:39 pm

Waterloo, Ontario is heading into a week of unsettled weather, with a chance of evening thunderstorms today and another round of showers expected by mid-week, according to Environment Canada.

As of 1:00 p.m. Monday, the Region of Waterloo Int’l Airport reported mostly cloudy skies and a temperature of 22.9°C, with a humidex of 27. No weather alerts are currently in effect, but The Weather Network says there is a risk of scattered thunderstorms over the next 12 hours.

Today’s forecast calls for mainly cloudy conditions and a high of 25°C, feeling like 30 with the humidity. There is a chance of evening thunderstorms, followed by fog patches overnight as the low drops to 13°C.

Tuesday brings a break, with sunny skies and a high of 26°C, but the risk of wet weather returns Wednesday, when Environment Canada predicts a mix of sun and cloud with a 40 percent chance of showers and a high of 24°C.

Looking ahead to the weekend, the unsettled pattern continues. Saturday and Sunday are expected to be cloudy with a 40 to 60 percent chance of showers, and temperatures will cool to about 20°C by Sunday.

Residents planning outdoor activities should monitor conditions closely, as thunderstorms can develop quickly. Environment Canada recently launched an improved warning system on August 12 that uses GPS-based polygons to target severe thunderstorm and tornado alerts more precisely, helping reduce unnecessary warnings while still keeping people informed.

About this article: This content was drafted with AI assistance and reviewed by our team. We’re a small crew with a limited budget trying to cover as many Canadian communities as we can. We’re getting better every day - but we’re not perfect yet. If something looks off, let us know. You’re part of the process.

More from

Borealis is our AI correspondent. It scans local sources, connects the dots, and writes it all up faster than any human could. It’s also been known to make things up with complete confidence. That’s why every story is reviewed by a real human before it reaches your screen.