Thunder Bay – Weather Desk – Thunder Bay is starting Sunday in the grip of lingering Arctic cold, with a Yellow Cold Warning still in effect for the City. While the wind is relatively light early this morning, very cold temperatures are keeping wind chills in the danger range, and Environment Canada notes wind chills near -40 are possible again tonight into Monday morning for some areas.

Conditions do begin to moderate on Monday, but the week stays colder than normal overall.

Today’s Weather Overview

Current Conditions (Thunder Bay Airport – 7:00 AM EST)

• Temperature: -27.0°C

• Wind Chill: -34

• Condition: Mostly Cloudy

• Wind: WSW 8 km/h

• Pressure: 103.2 kPa, falling

• Humidity: 72%

• Dew Point: -30.5°C

• Visibility: 24 km

Even with light wind, it’s still the kind of cold that bites quickly—especially if you’re outside for more than a few minutes without full coverage.

Yellow Warning – Cold

What the warning says

• What: wind chill values near -40

• When: continuing through this morning, and possibly returning tonight into Monday morning in some locations

• Impact: Moderate

• Confidence: High

Safety takeaway

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

• Take warm-up breaks if you’re outdoors for work or exercise.

• Keep emergency supplies in your vehicle (blankets, booster 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 Tuesday)

Sunday, January 25 (Today)

• Sky: Clearing this morning, then sunny

• Wind: Becoming northwest 20 km/h early this afternoon

• High: -19°C

• Wind chill: -36 this morning, improving to -29 this afternoon

• Risk: Frostbite risk

• UV Index: 1 (Low)

Tonight

• Sky: Clear, becoming partly cloudy after midnight

• Wind: West 20 km/h becoming light early this evening

• Low: -27°C

• Wind chill: -30 this evening, near -35 overnight

• Risk: Frostbite risk

Monday, January 26

• Sky: Mainly cloudy

• Flurries: 70% chance late afternoon

• Wind: West 20 km/h becoming light early afternoon

• High: -15°C

• Wind chill: -36 in the morning, improving to -22 in the afternoon

• Night: Cloudy periods with 60% chance of snow, low -22°C

Tuesday, January 27

• Sky: Sunny

• High: -15°C

• Night: Cloudy periods, low -22°C

Trend: The worst of the wind chill eases compared to the past few days, but mornings remain sharp. Snow chances increase Monday night, which could create slick roads for Tuesday’s commute.

Wardrobe Recommendations

Sunday (cold + building wind this afternoon):

• Thermal base layer (top + bottom)

• Insulating mid-layer (fleece or wool)

• Wind-resistant parka (the NW wind will cut through lighter jackets)

• Insulated mitts, toque, and a neck gaiter/balaclava for cheeks and nose

• Warm socks + insulated boots (avoid tight boots—circulation matters)

Monday (cloudy + flurries):

• Add a windproof outer layer and consider snow pants if you’ll be outside late day

• Keep spare gloves and a hat in your bag or vehicle in case conditions worsen

Weather Trivia

Thunder Bay’s cold snaps often feel worse when skies clear overnight. With fewer clouds acting like a “blanket,” heat escapes more quickly, allowing temperatures—and wind chills—to bottom out around sunrise.

Summary

Thunder Bay remains under a Yellow Cold Warning on Jan. 25, 2026, with wind chills near -40 possible this morning and potentially returning tonight into Monday morning. Sunny today, then clouds and flurries Monday with snow chances Monday night.