Thunder Bay – Weather – Thunder Bay is dealing with a high-impact winter mix to start Friday.
Environment Canada has a Yellow Snowfall Warning in effect for the City of Thunder Bay, with 15–20 cm expected (locally higher near Lake Superior) and reduced visibility in heavy snow and local blowing snow, ending later this morning.
Starting off your Boxing Day weather, roads crews from the City of Thunder Bay have been out starting to clear the snow. Major routes and bus routes along with sidewalks in the downtown Waterfront District have been cleared. Walking will offer challenges in places as will driving due to the snow. Continued snow combined with the warmer temperatures will make for slippery sections as well as lots of spray so top up the windshield washer fluid.
Today’s Weather Overview
Current Conditions (Thunder Bay Airport)
As of 6:30 AM EST, conditions at Thunder Bay Airport are light snow and -2°C, with humidity near 99%—that near-saturated air is keeping the snow steady and the sky locked in. Winds are NNE 5 km/h, giving a wind chill of -4. Pressure is 100.7 kPa and falling, a sign the system is still working through the region.
Today: Snow is expected to end this morning, then it turns cloudy with a 40% chance of flurries. Watch for a risk of freezing drizzle late this morning, which can quickly glaze roads and sidewalks even if snowfall is lighter. Local snowfall amounts of 2–4 cm are forecast for today’s daytime period, with a high near +1°C.
Travel note: Ontario 511 continues to emphasize checking conditions before heading out—winter travel can shift fast during warning-level snow and icing risk.
Tomorrow’s Forecast
Expected Conditions (Next Three Days)
Saturday, Dec. 27: A milder push arrives. It stays cloudy, with rain showers beginning in the afternoon—but the key hazard is a risk of freezing rain in the morning and afternoon before temperatures fully climb. Winds turn southeast 20 km/h early afternoon. High +2°C.
Sunday, Dec. 28: Back to winter-grey: cloudy with a 40% chance of flurries, high near +1°C. Sunday night turns sharper with a 60% chance of flurries and a low near -12°C.
Monday, Dec. 29: Colder air takes control: mix of sun and cloud with a 40% chance of flurries, high near -10°C. Monday night: 60% chance of flurries, low near -20°C.
Wardrobe Recommendations
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This morning (snow + warning conditions): Winter boots, insulated coat, warm gloves/mitts, toque, and a neck warmer. If you’re outdoors for work or travel, add goggles or glasses—blowing snow can sting and reduce visibility quickly.
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Freezing drizzle/freezing rain risk (late today + Saturday): Prioritize boots with strong traction; consider ice cleats if you’ll be on untreated sidewalks or parking lots.
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Colder trend by Sunday night into Monday: Add a base layer and swap to heavier mitts—-12°C to -20°C lowscan bite fast in exposed areas.
Weather Trivia
Thunder Bay’s location on Lake Superior puts it in the zone for lake-effect snow. When colder air moves over relatively warmer open water, it can pick up moisture and drop it as narrow, intense snow bands downwind—meaning snowfall can vary a lot from one neighbourhood to the next.
The Last Word on Boxing Day Weather
Thunder Bay weather for Friday, Dec. 26, 2025: Snowfall Warning continues this morning with 15–20 cm possible and reduced visibility. Snow tapers to flurries, with freezing drizzle risk late morning. Saturday brings freezing rain risk before afternoon rain showers, then colder air returns Sunday night into Monday.
