Thunder Bay – Weather – The city is waking up to a cloudy start with high humidity and improving pressure—often a sign of steadier weather—but today’s setup still supports flurries and a risk of freezing drizzle.
Tonight, the pattern turns more active again with a 70% chance of snow and continued freezing drizzle risk, which could create slick travel conditions and reduced visibility at times.
Current Conditions (Observed 7:00 AM EST, Wednesday March 4)
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Condition: Cloudy
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Temperature: -4.3°C (headline: -4°C)
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Wind: NE 8 km/h
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Wind Chill: -8
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Pressure: 102.3 kPa, rising
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Humidity: 90%
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Dew Point: -5.7°C
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Visibility: 16 km
Today (Wednesday)
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Sky: Cloudy
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Precipitation: 40% chance of flurries
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Main risk: Freezing drizzle (especially where surfaces stay below 0°C)
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Fog: Morning fog patches dissipating
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Wind: Becoming northeast 20 km/h late this afternoon
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High: -1°C
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Wind chill: Near -9
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UV Index: 1 (Low)
Tonight (Wednesday Night)
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Sky: Cloudy
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Precipitation: 70% chance of snow
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Also: Risk of freezing drizzle
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Wind: East 20 km/h
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Low: -10°C
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Wind chill: -9 this evening, -16 overnight
Expected Conditions (Next Three Days)
Thursday, March 5
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Sky: Cloudy
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Precipitation: 40% chance of flurries
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Main risk: Freezing drizzle in the mix
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Wind: East 20 km/h becoming light early morning
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High: -3°C
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Wind chill: -17 in the morning, improving to -8 in the afternoon
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UV Index: 1 (Low)
Friday, March 6
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Sky: Cloudy
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Precipitation: 60% chance of flurries or rain showers (a messy, mixed-precip day)
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High: +2°C
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Friday Night: Cloudy with 30% chance of flurries, low -5°C
Saturday, March 7
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Sky: A mix of sun and cloud
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High: +4°C
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Saturday Night: Cloudy periods, low -2°C
Wardrobe Recommendations
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This morning: A warm winter coat, toque, and gloves are still needed at -4°C with a -8 wind chill.
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Freezing drizzle risk (today + tonight + Thursday): Wear boots with strong traction and consider ice grips if you’re walking a lot. Roads and sidewalks can become slick fast even if precipitation looks light.
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Tonight: If you’re out late, plan for -10°C and wind chill near -16—add a scarf/neck warmer and a wind-resistant outer layer.
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Friday into the weekend: With temps rising above freezing, go with water-resistant outerwear and footwear—melting and refreezing can create icy patches at night.
Weather Trivia
Freezing drizzle is one of the trickiest winter hazards because it can fall lightly but freeze instantly on contact. It often develops in low clouds when temperatures hover near freezing and there isn’t enough ice in the cloud to form steady snow—so you end up with supercooled droplets that glaze roads and sidewalks.
Summary
Thunder Bay weather forecast for Wednesday, March 4, 2026: cloudy and -4°C this morning with rising pressure. Expect a 40% chance of flurries and a risk of freezing drizzle today. Tonight brings a 70% chance of snow with freezing drizzle risk, low -10°C. Thursday stays cloudy with flurries and freezing drizzle risk; a warmer, mixed-precip trend arrives Friday with a high of +2°C.
