Thunder Bay – Weather – Thunder Bay is starting Wednesday with light snow and reduced visibility, and the day stays unsettled with on-and-off flurries. The bigger impact will be the wind: northwest winds gusting to 50 km/h develop late this morning, helping push temperatures up briefly to +2°C—but also setting up a sharp drop tonight as Arctic air returns and the temperature plunges to -14°C with a wind chill near -18.
Current Conditions (Observed 8:00 AM EDT, Wednesday March 11, 2026)
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Condition: Light snow
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Temperature: -6.4°C (headline: -6°C)
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Wind: NNW 7 km/h
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Wind Chill: -10
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Pressure: 101.8 kPa, falling
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Humidity: 86%
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Dew Point: -8.4°C
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Visibility: 10 km
Today (Wednesday)
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Sky: A mix of sun and cloud
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Flurries: 40% chance of flurries
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Wind: Becoming NW 30 km/h gusting to 50 late this morning
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High: +2°C
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Wind Chill: Near -13 this morning
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UV Index: 2 (Low)
Expected Conditions (Next Three Days)
Tonight (Wednesday Night)
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Sky: Partly cloudy
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Flurries: 30% chance of flurries
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Wind: NW 30 gusting 50 becoming light this evening
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Low: -14°C
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Wind Chill: -18 overnight
Thursday, March 12
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Morning: Clearing
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Wind: Becoming SE 20 km/h late afternoon
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High: -3°C
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Wind Chill: -20 in the morning, improving to -9 in the afternoon
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Thursday Night: Cloudy with 60% chance of snow, low -11°C
Friday, March 13
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Day: Cloudy with 60% chance of snow
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High: -1°C
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Night: Cloudy periods with 30% chance of snow, low -12°C
Wardrobe Recommendations
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This morning: Dress for -6°C with wind chill near -10 to -13—warm coat, hat, gloves/mitts.
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Late morning/afternoon: The gusty NW wind will make it feel raw even as temps rise. Add a windproof outer layer if you’ll be outside.
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Tonight: The temperature drop is significant—go with full winter gear if you’re out late (insulated boots, mitts, face/neck covering).
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Thursday morning: Wind chills near -20—dress for mid-winter conditions again.
Weather Trivia
A day that warms above freezing and then crashes well below zero overnight is a recipe for flash freeze conditions. Any wet spots from melting snow or daytime drizzle can refreeze quickly after sunset—often hardest to see on bridges, shaded streets, and parking lots.
Summary
Thunder Bay weather forecast for Wednesday, March 11, 2026: light snow and -6°C this morning with falling pressure. A mix of sun and cloud with a 40% chance of flurries today, and northwest wind gusts up to 50 km/h. High +2°C, then a sharp drop tonight to -14°C with wind chill near -18. Clearing Thursday morning before snow chances return Thursday night.
