Friday, June 13, 2025 – Ottawa
Frost advisories in Ontario, Quebec and Newfoundland
A surge of unseasonably cold air for mid-June is bringing overnight frost conditions to parts of eastern Canada, particularly across Ontario, Quebec, and sections of Newfoundland. Nighttime temperatures are expected to drop close to 0 °C (32 °F) between Friday, June 13 and Saturday, June 14, posing a threat to frost-sensitive vegetation.
Frost advisories are currently in place for northern Ontario, stretching from the Lake Nipigon region eastward to the Quebec border. Central Quebec is also under alert, including the areas around Val-d’Or and La Tuque. In Newfoundland, both western and central regions are affected.
Residents are strongly urged to protect garden plants and crops, as the expected minimum temperatures may be damaging, especially given the unusual timing so late into the growing season.
Air quality concerns in Alberta, British Columbia and Yukon
In western Canada, widespread wildfire smoke continues to degrade air quality across much of Alberta, British Columbia, and the southern Yukon.
In Alberta, air quality warnings remain in effect for areas north of High Prairie and Grande Prairie, stretching toward the British Columbia border and up to Rainbow Lake. A special air quality statement is also in effect in British Columbia, from Quesnel in the south to Fort Nelson in the north. In the Yukon, impacted areas include Teslin, Watson Lake, and Tuchitua.
Environment Canada advises all residents to limit outdoor exposure, keep windows and doors closed, and watch for symptoms related to smoke exposure, such as eye, nose, or throat irritation, headaches, and coughing. More serious signs may include wheezing or chest discomfort.
Everyone is at risk during periods of dense smoke, regardless of age or health condition. However, older adults, young children, pregnant individuals, and those with chronic conditions should be especially cautious and avoid strenuous outdoor activity.
The agency recommends using indoor air purifiers and wearing well-fitted respirator masks when outdoor exposure is unavoidable.
Thunderstorms forecast for Saskatchewan on Saturday
In the Prairies, Saskatchewan is expected to experience unstable weather on Saturday, June 14, with a risk of thunderstorms across central and northern regions.
Forecasts suggest that municipalities like Saskatoon, Regina, Prince Albert, Humboldt, and Moose Jaw could see thunderstorm activity, potentially accompanied by intense rainfall and lightning. The system is expected to develop through the afternoon and evening, driven by humid air masses moving in from the southwest.
As a result, this weekend’s forecast brings diverse weather challenges across the country, from frost warnings in the east, to air quality concerns in the west, and thunderstorm risks in the central provinces.
