Active Weather
A pleasant late-May day across Ontario. No active weather alerts from Environment and Climate Change Canada. Toronto is mainly sunny with a high of 21°C, clearing after overnight clouds. Winds are northwest at 20 km/h gusting to 40. The UV index is 7 (high) — sunscreen is warranted for extended outdoor time.
Friday brings warmer temperatures to southern Ontario, with Toronto reaching 26°C under sunny skies. A chance of showers develops Saturday night into Sunday, but no severe weather is expected through the weekend.
Infrastructure
No active wildfire incidents, disaster declarations, or major infrastructure disruptions reported in Ontario. Power grids are operating normally. No river flooding concerns.
Northwestern Ontario has seen some early wildfire activity — The Weather Network reported evacuation notices issued for Mine Centre in northwestern Ontario due to wildfire threats. Residents in northern and rural Ontario should monitor the Ontario Ministry of Natural Resources and Forestry fire map for developing conditions.
Public Health
No active public health advisories for Ontario. Air quality is within normal ranges.
Internationally, the World Health Organization declared a Public Health Emergency of International Concern on May 17 for an Ebola disease outbreak in the Democratic Republic of the Congo and Uganda. The Public Health Agency of Canada is monitoring the situation. The risk to Canadian households is considered low. A separate hantavirus cluster linked to an Atlantic cruise ship is also being monitored. No confirmed Canadian cases have been reported. Neither situation requires household action at this time.
Watch Item
Southwestern Ontario sits in the severe weather corridor that extends from the Great Lakes into the Ohio Valley. The 2026 severe weather season has been notably active across the lower Great Lakes region — the U.S. NWS Chicago office reported nearly three times the average number of severe weather events through mid-April. While Ontario has been relatively quiet, the active pattern may produce thunderstorm activity that crosses the border as the season continues.
Wildfire season across the province historically runs from May through September. The 2025 season saw significant activity in Ontario, and the early 2026 start in the west is a reminder that conditions can change quickly. Households in northern and rural Ontario near forested areas should have a preparedness plan in place.
With the summer outdoor season approaching, this is a good time to review your household's emergency kit. Check batteries in flashlights and weather radios, rotate water supplies, and make sure your household communication plan is current.
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