Environment Canada has issued a severe thunderstorm watch for Ottawa on Tuesday, June 30, 2026, as hot and humid conditions create the potential for dangerous storms. The watch, originally posted early Tuesday morning, remains in effect as of 10:27 AM EDT.
What to expect
The forecast calls for a muggy day with temperatures rising into the high 20s Celsius, accompanied by high humidity. Thunderstorms are expected to develop by late afternoon or early evening, with some potentially becoming severe. Risks include heavy downpours, strong wind gusts up to 90 km/h, and hail up to the size of nickels. Localized flooding is possible in low-lying areas.
Residents are advised to monitor weather alerts and take precautions, such as securing loose objects and avoiding outdoor activities during storms. The watch covers Ottawa and surrounding areas, including Gatineau, Que.
Context and impact
This watch follows a rainy June in the region, which has contributed to higher mosquito populations and depleted bug spray supplies at local stores. The storm system is part of a broader weather pattern affecting southern Ontario and Quebec, with heat warnings also in effect for parts of southwestern Ontario. As of Tuesday morning, no tornado warnings have been issued, but the public is urged to stay informed through official channels.
