Residents of Thunder Bay, Ontario, should prepare for a significant change in weather as a spring storm brings a mix of rain and thunderstorm risks today, April 17, 2026, followed by a sharp drop in temperatures overnight.
According to Environment Canada, periods of rain are expected throughout the day with a continued risk of thunderstorms. The Weather Network reports that the region could see between 10 and 15 millimetres of rain as these conditions move through the area.
The weather is expected to take a wintry turn overnight. Northwest winds will strengthen to 30 km/h with gusts reaching 50 km/h, while temperatures will fall to -4°C. The wind chill is expected to make it feel closer to -9°C.
Drivers should use caution on Saturday, April 18, 2026, as freezing drizzle and flurries are expected to develop overnight, potentially leading to slippery road conditions. Temperatures will remain near the freezing mark throughout the day, with wind chill values near -10°C.
While Thunder Bay is currently under no formal weather alerts, the city’s location on the shore of Lake Superior frequently leads to rapid shifts in spring weather. These conditions can move from rain and thunderstorm risks to freezing drizzle and flurries in less than 12 hours.
