Thunder Bay, Ontario got a taste of summer this past weekend with mainly sunny skies and temperatures near seasonal norms. Environment Canada recorded a peak of 20°C at the Thunder Bay Airport station on Sunday, June 7, 2026, slightly below the typical high for early June.
The weekend started off cool and foggy, but skies cleared by Saturday afternoon. Overnight lows settled between 10 and 12°C as fog patches returned, a common pattern for the city in June due to temperature differences between the land and Lake Superior. No weather alerts were issued by Environment Canada for the weekend.
Sun seekers needed to take precautions, though. The UV index hit 7 on Saturday, which is considered high, and climbed to 8 or 9 on Sunday, reaching the very high range. Health Canada advises that at those levels, people should limit time in the sun especially between 11 a.m. and 3 p.m., wear sunglasses, seek shade, and reapply sunscreen every two hours.
Sunday saw mainly sunny conditions from early afternoon right through the evening, with light east winds gusting at times to 39 km/h. The overnight period into Monday stayed partly cloudy before fog developed once again.
For context, temperatures for the weekend were right around the 30-year average for early June in Thunder Bay, which is a daytime high near 21°C and an overnight low near 7°C. So while earlier forecasts had hinted at warmer highs, the actual conditions still delivered a pleasant and uneventful weekend for residents.
