Port Colborne, Ontario is in for a hot, sunny Monday before stormy weather moves in Tuesday afternoon, according to Environment Canada. The forecast shows temperatures reaching 29°C on June 8, with a Humidex of 32 and a very high UV index of 9. That combination means residents heading outdoors should take sun safety seriously.
Tuesday brings a shift, with mainly cloudy skies, a 30 percent chance of showers, and a risk of thunderstorms in the morning and afternoon. The high will climb to 30°C, but it will feel much hotter because the Humidex is expected to hit 41. Environment Canada classifies that level as “great discomfort; avoid exertion.” Southwest winds of 30 km/h are also in the forecast. For those closer to Lake Erie, temperatures will be lower, with a high near 22°C and a Humidex around 33.
The hot, muggy air is part of a larger pattern affecting much of the province. The Weather Network has warned of a “dual weather threat” across Ontario this week, with extreme heat combining with thunderstorm potential. Thunderstorm activity is expected to start in southwestern areas like Port Colborne on Tuesday afternoon before spreading to cottage country and the Greater Toronto Area by evening.
The UV index remains very high both days, at 9 on Monday and 8 on Tuesday. With southern Ontario recording the country’s highest UV levels, residents are reminded to limit time in the sun between 11 a.m. and 3 p.m., wear protective sunglasses, seek shade, and reapply sunscreen every two hours.
Looking ahead, Wednesday through Friday will be cloudy with a 30 to 40 percent chance of showers and highs between 26 and 27°C. The weekend offers a mix, with Saturday expected to be sunny and 27°C, while Sunday carries a chance of showers and a high of 24°C.
Monday’s dry, sunny weather is a good opportunity to enjoy outdoor plans. But residents should prepare for a stormier Tuesday and take extra care during the most humid part of the day, as heat-related illnesses become more likely when the Humidex climbs above 40.
