Thunder Bay – Weather – Thunder Bay starts Thursday under partly cloudy skies and bitter morning cold, but a milder trend develops through the day. The calm conditions won’t last: snow moves in this evening, and there is a risk of freezing rain tonight, which could create slick roads and walkways.
By Friday, temperatures surge into the mid-single digits, but freezing drizzle remains a concern early in the day before the weekend turns “mixed-bag” again.
Current Conditions (Observed 8:00 AM EDT, Thursday March 19, 2026)
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Temperature: -13.9°C
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Condition: Partly cloudy
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Wind: N 2 km/h
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Wind Chill: -15
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Humidity: 86%
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Dew Point: -15.8°C
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Pressure: 102.1 kPa (rising)
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Visibility: 32 km
Today (Thursday)
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Sky: Sunny, increasing cloudiness this afternoon
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Wind: Up to 15 km/h
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High: +1°C
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UV Index: 3 (Moderate)
Expected Conditions (Next Three Days)
Tonight (Thursday Night)
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Sky: Cloudy
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Snow: Beginning this evening and ending overnight
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Freezing rain risk: This evening and overnight
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Local snowfall: 5 to 10 cm
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Wind: SE 20 km/h gusting to 40, becoming light late evening
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Low: -4°C
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Wind Chill: Near -9 overnight
Friday, March 20
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Sky: Cloudy
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Early: 40% chance of flurries with risk of freezing drizzle
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Wind: Up to 15 km/h
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High: 6°C
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Wind Chill: Near -9 in the morning
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Friday Night: Cloudy periods with 60% chance of snow or rain, low -1°C
Saturday, March 21
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Day: Cloudy with 70% chance of rain or snow
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High: +3°C
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Night: Cloudy with 30% chance of flurries, low -11°C
(Trend: Sunday turns colder again with a mix of sun and cloud and a high near -2°C, then clear and cold at night.)
Wardrobe Recommendations
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This morning: Dress for -14°C—winter coat, hat, and gloves are still required.
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This afternoon: Temperatures climb toward +1°C. Use layers so you can adjust as it warms.
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Tonight (snow + freezing rain risk): Wear boots with strong traction. If you’re driving, plan for slick roads—especially bridges, hills, intersections, and untreated side streets.
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Friday: A warmer day, but still damp and potentially icy early. A water-resistant outer layer helps as snow/rain mixes in.
Weather Trivia
Freezing rain can occur even when the air temperature is only slightly below zero at the surface. Rain falls through a warm layer aloft, then hits cold ground and freezes on contact—creating a thin glaze that can be hard to see but very slippery.
Weather Overview
Thunder Bay weather forecast for March 19, 2026: sunny today with increasing cloud and a high of +1°C after a cold morning near -14°C. Snow begins this evening with 5–10 cm possible and a risk of freezing rain overnight. Friday warms to 6°C with a risk of freezing drizzle early, followed by mixed rain/snow chances into the weekend.
