Thunder Bay, Ontario, is in for a stretch of warm, sunny weather this week, with temperatures climbing several degrees above the July norm. Environment Canada forecasts a high of 27°C for Monday, July 6, 2026, and daily highs reaching up to 30°C by the weekend.
Today’s UV index is rated 8, or very high, so anyone spending time outdoors should take precautions. Environment and Climate Change Canada advises reducing sun exposure between 11 a.m. and 3 p.m., seeking shade, wearing UV-protective sunglasses, and reapplying sunscreen every two hours.
Clear skies this evening will give way to a 60 percent chance of showers overnight, along with a risk of thunderstorms. That chance of showers lingers into Tuesday morning before conditions settle. Despite the active weather to the west, no alerts are in effect for the City of Thunder Bay, according to Environment Canada.
Sunny conditions return for much of the week, though a chance of showers lingers Tuesday and Wednesday. Highs reach 27°C on Tuesday, climbing to 29°C on Saturday, and hitting 30°C on Sunday. Sunday also brings a chance of showers. The historical average for this time of year is a high of 24°C, so residents can expect it to feel noticeably warmer than usual.
Tornado watches are in place for parts of southeastern Manitoba and northwestern Ontario near the border, where hail up to 4 cm and wind gusts to 100 km/h are possible. However, that unsettled pattern is not expected to bring severe weather into Thunder Bay for the time being. Residents are encouraged to check the full forecast before planning outdoor evening activities, given the overnight thunderstorm risk.
