THUNDER BAY – WEATHER – Weather wise March has come in like a frozen lion. While there is not a weather alert or warning in effect this morning we are right on the boundary.
Put mittens on your kittens this morning and please don’t leave your pets outside for too long.
Thunder Bay starts Sunday under a serious cold snap, with clear skies and high, rising pressure locking in Arctic air. The good news: sunshine returns today and temperatures begin a steady climb this week.
The bad news: this morning’s wind chill near -39 means frostbite is a real risk with any prolonged time outdoors.
Today’s Weather Overview
Current Conditions (Observed 7:00 AM EST, Sunday March 1, 2026)
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Condition: Mainly clear
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Temperature: -30.9°C (headline: -31°C)
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Wind: WSW 8 km/h
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Wind Chill: -39
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Pressure: 103.7 kPa, rising
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Humidity: 72%
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Dew point: -34.3°C
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Visibility: 24 km
Today (Sunday)
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Sky: Sunny
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Wind: Becoming south 20 km/h early this afternoon
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High: -8°C
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Wind chill: -33 this morning, improving to -11 this afternoon
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UV Index: 2 (Low)
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Main concern: Frostbite risk this morning, especially if skin is exposed.
Tomorrow’s Forecast
Expected Conditions (Next Three Days)
Tonight (Sunday Night)
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Sky: Clear, becoming partly cloudy late evening
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Wind: Up to 15 km/h
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Low: -20°C
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Wind chill: Near -25 this evening
Monday, March 2
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Sky: A mix of sun and cloud; 40% chance of flurries in the morning
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Wind: Becoming west 30 km/h gusting to 50 in the morning
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High: +1°C
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Wind chill: Near -20 in the morning
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Night: Cloudy, low -7°C
Tuesday, March 3
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Sky: Cloudy
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High: 0°C
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Night: Cloudy, low -6°C
Wednesday, March 4 (Trend)
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Sky: A mix of sun and cloud
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High: 4°C
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Night: Cloudy, low -5°C
Wardrobe Recommendations
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This morning (wind chill -39): Full winter gear is non-negotiable—insulated parka, warm base layers, snow pants, and insulated boots. Cover exposed skin with a balaclava/neck warmer, and wear mitts instead of gloves.
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This afternoon: It will feel much better than the morning, but still winter-cold. Keep layers, and add a wind-resistant shell if you’ll be outside for long.
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Monday morning: Even with a warmer daytime high, expect a sharp start and gusty west winds—dress in layers you can peel back later.
Weather Trivia
When pressure climbs above 103 kPa in winter, it often signals a strong high-pressure system overhead. High pressure can bring sunshine and calmer weather—but it can also trap cold air near the surface, which is why the coldest mornings often happen under clear skies.
In Summary
Thunder Bay weather report for Sunday, March 1, 2026: mainly clear and -31°C at 7:00 AM with wind chill near -39 and rising pressure. Sunny today with a high of -8°C, then a warming trend starts Monday with a high of +1°C and a chance of morning flurries, followed by near-zero temperatures into midweek.
