THUNDER BAY – WEATHER DESK – Thunder Bay is starting Saturday under clear skies, high pressure, and deep Arctic cold. While sunshine will help a little later today, the Yellow Cold Warning remains in effect for the City of Thunder Bay as wind chills stay in the -40 to -45range at times—especially mornings and overnight—keeping frostbite risk high through Sunday morning.

Today’s Weather Overview

Current Conditions (Thunder Bay Airport – 5:00 AM EST)

• Temperature: -30.1°C

• Wind Chill: -41

• Condition: Clear

• Wind: WNW 13 km/h

• Pressure: 104.0 kPa, rising

• Humidity: 67%

• Dew Point: -34.2°C

• Visibility: 24 km

This is classic “clear and cutting cold” weather: the sky looks calm, but the air is dangerous in minutes if skin is exposed.

Yellow Warning – Cold

What Environment Canada is warning about

• What: Wind chill values of -40 to -45

• When: Continuing through Sunday morning

• Impact Level: Moderate

• Forecast Confidence: High

Little relief is expected during the day as the Arctic airmass remains in place. Even when afternoon wind chills improve, mornings and overnight conditions can still hit extreme thresholds quickly.

Key safety message

• Cover exposed skin—especially cheeks, nose, ears, and hands.

• Plan errands and outdoor work in short blocks with warm-up breaks.

• Keep emergency supplies in your vehicle (blankets, jumper cables, warm gear).

• If it’s too cold for you to stay outside, it’s too cold for your pet to stay outside.

Extended Weather Forecast

Expected Conditions (Today through Monday)

Saturday, January 24 (Today)

• Sky: Sunny

• Wind: Up to 15 km/h

• High: -21°C

• Wind chill: -40 this morning, improving to -25 this afternoon

• Risk: Frostbite in minutes

• UV Index: 1 (Low)

Tonight

• Sky: Partly cloudy

• Wind: Up to 15 km/h

• Low: -29°C

• Wind chill: -25 this evening, dropping to -38 overnight

• Risk: Frostbite risk (especially later overnight)

Sunday, January 25

• Sky: Sunny

• Wind: Becoming west 20 km/h gusting to 40 in the morning

• High: -20°C

• Wind chill: -41 in the morning, improving to -30 in the afternoon

• Risk: Frostbite in minutes

• Night: Clear, low -26°C

Monday, January 26

• Sky: Cloudy with 40% chance of snow

• High: -15°C

• Night: Cloudy periods with 60% chance of snow, low -21°C

Trend: Temperatures slowly moderate into early next week, but it stays winter-cold. The bigger shift is more cloud and increasing snow chances by Monday.

Wardrobe Recommendations

When wind chills hover near -40, dress like you might be outside longer than planned:

• Base layer: thermal top/bottom (moisture-wicking)

• Mid layer: fleece or wool insulation

• Outer layer: windproof parka + snow pants (wind protection is key Sunday)

• Hands: insulated mitts + liners

• Head/face: toque that covers ears + neck gaiter/balaclava for cheeks and nose

• Feet: warm socks + insulated boots (not tight)

• Drivers: keep spare mitts/hat, a blanket, and a phone charger in your vehicle

Pet Safety During the Cold Warning

• Keep cats indoors.

• For dogs: shorten walks to quick bathroom breaks during the coldest parts of the day.

• Wipe paws after outings (ice and salt can irritate), and watch for shivering or lifting paws—signs it’s too cold.

Weather Trivia

High pressure often brings clear skies—but also colder nights. With fewer clouds to trap heat, the ground loses warmth faster overnight. That’s one reason Thunder Bay can look “nice and sunny” while still delivering dangerous wind chills at sunrise.

Summary

Thunder Bay remains under a Yellow Cold Warning on Jan. 24, 2026, with wind chills near -40 to -45 through Sunday morning. Full forecast, frostbite risk guidance, wardrobe tips, and weekend outlook.