Thunder Bay – WEATHER DESK – Thunder Bay is off to a damp, grey start this Sunday, with drizzle, low visibility, and a raw east-northeast wind setting the tone. Environment Canada’s current city forecast calls for leftover drizzle or rain this morning, a few showers this afternoon, and a risk of a thunderstorm late today, followed by more unsettled weather tonight.
By NetNewsLedger Weather Desk
Today’s Weather Overview
In the 7:43 AM EDT observation you shared, Thunder Bay was sitting at 2.2°C with light drizzle, 99 percent humidity, an ENE wind at 14 km/h, and visibility reduced to just 3 km. It is the kind of morning that feels more soaked than stormy, with fog and drizzle making the city look and feel smaller.
Environment Canada says periods of rain or drizzle will end early this morning, then give way to cloudy skies with a 40 percent chance of drizzle or showers through the morning and early afternoon. A few showers begin this afternoon, and there is a risk of a thunderstorm late this afternoon. Fog patches are also part of the setup, and the high is expected to reach 6°C.
Tonight and the Next Three Days
Tonight stays unsettled. Environment Canada calls for a few showers ending this evening, then cloudy skies with a 40 percent chance of showers or drizzle. There is still a risk of a thunderstorm early this evening, and fog patchesremain in the forecast. Temperatures hold nearly steady, staying near 7°C overnight instead of dropping off sharply.
Monday improves somewhat, with a mix of sun and cloud and only a 30 percent chance of showers or drizzle in the morning. Fog patches should dissipate in the morning, and the high will again reach about 6°C. Monday night turns colder, with cloudy skies, a 40 percent chance of showers, and a low of -3°C.
By Tuesday, Thunder Bay cools back into a more subdued pattern with cloudy skies and a high near 3°C, followed by another chilly night near -2°C. Wednesday stays cloudy with a high around 5°C, and Thursday looks like the pick of the extended stretch, with a mix of sun and cloud and a high near 9°C.
Travel and Local Outlook
This is not a major warning day, but it is still a day to slow down a little. The 3 km visibility in your morning observation, along with drizzle, fog patches, and a thunder risk later today, means roads can be slick and conditions can change quickly in spots. The bigger travel improvement should come Monday, though the return to sub-freezing temperatures Monday night means spring is still not fully settled in.
Wardrobe Recommendations
A water-resistant jacket and solid footwear are the smart choices today. It is not especially cold, but it is damp, and the kind of damp that works through lighter clothing quickly. Monday will feel easier to manage, but by Monday night the return to -3°C means heavier layers are still worth keeping close at hand.
Weather Trivia
Thunder Bay spring weather often flips between drizzle, fog, and chilly sunshine because Lake Superior helps keep the air cool and moisture-rich even when inland areas warm faster. That is one reason a day can start with poor visibility and drizzle, then still carry a thunderstorm risk later on.
Weather Synopsis
Thunder Bay weather outlook for April 12, 2026: drizzle and fog this morning, a chance of showers and a thunderstorm this afternoon, then cooler and cloudier weather into early next week.
