Thunder Bay – WEATHER – Call it a winter storm or a spring snowstorm, but either way Thunder Bay is in for a rough stretch. Environment Canada has a Yellow Snowfall Warning in effect for the City of Thunder Bay, with 15 to 30 cm of snow expected from Saturday into Sunday morning, along with peak snowfall rates of 2 to 4 cm per hour, reduced visibility, local blowing snow, and possible utility outages.
Travel is expected to be challenging through later today and tonight.
As of 8:35 AM EDT Saturday, your local update showed light snow and -2°C, with an east-northeast wind gusting to 45 km/h and visibility down to 13 km.
Today’s Weather Overview
Current Conditions
Saturday is the hardest-hit day of the stretch. Environment Canada says snow at times heavy is expected today, with 10 to 20 cm during the day, an east wind at 30 km/h gusting to 50, and a high near 0°C. The warning says the snow begins near the international border early and spreads north and east through the morning, which puts Thunder Bay squarely in the path of deteriorating conditions.
This is not a nuisance snowfall. Environment Canada warns that roads and walkways will likely be difficult to navigate, visibility will likely be reduced at times, and local utility outages are possible. People clearing snow are also being urged to take frequent breaks and avoid overexertion.
Sunday Forecast
Sunday should be better than Saturday, but not fully clear. The weather tool shows a rather cloudy Sunday with a couple of snow showers and a high near 7°C, while Environment Canada’s local forecast page points to a mix of sun and cloud with a 40 percent chance of flurries early in the morning and strong northwest winds. Either way, the trend is toward gradual improvement after the main storm exits, though some snow shower activity may linger early in the day.
Sunday night stays cold, with a chance of leftover flurries and temperatures dropping below freezing again. That means slushy areas may refreeze after sunset. That refreezing concern is an inference based on the forecast calling for sub-freezing overnight temperatures after a milder daytime high.
Monday Forecast
Monday looks quieter, but colder again. The weather tool calls for a morning snow shower, then cloudy, breezy, and colder conditions with a high near -3°C and a low around -14°C Monday night. Environment Canada’s local forecast similarly keeps a 40 percent chance of flurries in the picture, followed by a clear and very cold night near -13°C.
So while the worst of the storm should be over by then, Monday still looks like a day to dress for winter and watch for icy surfaces.
Travel Outlook
If you have to be on the road today, plan for the worst conditions from Saturday through early Sunday. Environment Canada says travel will likely be challenging, with difficult road conditions and poor visibility at times. The safest approach is to slow down, leave extra stopping distance, and give yourself more time than usual.
Check www.511on.ca for the latest road conditions.
Sunday should offer gradual improvement, but not a clean reset, and Monday may still bring patchy slick spots as colder air settles back in. That is an inference based on the improving Sunday forecast followed by sub-freezing temperatures and lingering snow chances Monday.
Wardrobe Recommendations
This is full winter gear weather in Thunder Bay. For Saturday and Saturday night, think insulated coat, hat, gloves, scarf, and winter boots with good traction. By Sunday afternoon it may feel a little less harsh, but Monday swings colder again, so keep the heavier layers close by.
Weather Trivia
Thunder Bay’s normal high for early April is around 6°C, so this storm is a reminder that spring on the north shore of Lake Superior can still deliver a very convincing winter encore.
In Summary: Thunder Bay weather for April 4 to 6, 2026: a spring snowstorm brings 15 to 30 cm through Sunday morning, hazardous travel on Saturday, improving weather Sunday, and colder conditions again Monday.
