THUNDER BAY – WEATHER DESK – Thunder Bay is starting Wednesday under partly cloudy skies and deep cold, with pressure falling as the next weak system moves through. Light snow develops near noon, then tapers off this evening.

The bigger concern is tonight: northwest winds increase and wind chills fall near -33, keeping frostbite risk on the table.

Remember it is equally cold for your pets too. Make sure livestock has shelter and water.

Today’s Weather Overview

Current Conditions (Thunder Bay Airport — 6:23 AM EST)

• Temperature: -21.6°C (Weather Focus: -22°C)

• Condition: Partly cloudy

• Wind: N 4 km/h

• Wind Chill: -25

• Humidity: 81%

• Pressure: 101.2 kPa, falling

• Visibility: 24 km

Today (Wed, Jan 21)

• Mainly cloudy with a 40% chance of flurries this morning

• Periods of light snow beginning near noon

• Wind up to 15 km/h

• High: -14°C

• Wind chill -27 this morning, improving to about -18 this afternoon

Extended Weather Forecast

Expected Conditions (Next Three Days)

Tonight

• Periods of light snow ending this evening, then partly cloudy with 40% chance of flurries

• Wind becoming NW 20 km/h after midnight

• Low: -22°C

• Wind chill near -33 overnight

• Risk of frostbite

Thursday (Jan 22)

• Mix of sun and cloud with 40% chance of flurries

• Wind NW 20 km/h early, becoming light

• High: -19°C

• Wind chill near -32

• Risk of frostbite

• Thursday night: Cloudy periods, low -32°C

Friday (Jan 23)

• A mix of sun and cloud

• High: -22°C

• Friday night: Cloudy periods, low -31°C

Wardrobe Recommendations

• This morning: Full winter gear—parka, insulated mitts, toque, and a neck warmer. Wind chill is already in the -20s.

• Tonight/Thursday morning: Add face coverage. Wind chills near -33 mean exposed skin can get into trouble quickly.

• For the midday snow: Wear boots with good traction—light snow can hide icy patches on sidewalks and parking lots.

Weather Trivia

Thunder Bay often gets “sneaky” winter systems: even light snow can cause big travel headaches when temperatures are low, because it doesn’t melt—it packs down and turns slippery fast.

Summary

Thunder Bay forecast for January 21, 2026: Cold start near -22°C with wind chill in the -20s. Light snow begins near noon, ending this evening. Northwest winds increase overnight with wind chills near -33 and frostbite risk. Flurries possible Thursday with continued bitter cold.