THUNDER BAY – WEATHER – Thunder Bay starts Tuesday in the deep freeze, with a bitter wind chill near -34 this morning.

The upside is a mainly sunny day ahead, but don’t underestimate the cold—frostbite remains a risk, especially early today. Light snow returns mid-week, with periods of light snow Wednesday afternoon.

Today’s Weather Overview

Current Conditions (Thunder Bay Airport — 8:00 AM EST)

• Temperature: -23.9°C (Weather Focus: -24°C)

• Condition: Mostly cloudy

• Wind: WSW 15 km/h

• Wind Chill: -34

• Humidity: 69%

• Pressure: 101.9 kPa, falling

• Visibility: 24 km

Today (Tue, Jan 20)

• Mainly sunny

• Wind becoming W 20 km/h this morning

• High: -16°C

• Wind chill -34 this morning, improving to around -22 this afternoon

• Risk of frostbite

• UV Index: 1 (low)

Extended Forecast

Expected Conditions (Next Three Days)

Tonight

• Partly cloudy

• 30% chance of flurries late evening and after midnight

• Low: -18°C

• Wind chill near -22

Wednesday (Jan 21)

• Mainly cloudy

• Periods of light snow beginning in the afternoon

• High: -15°C

• Wind chill near -24

• Wednesday night: Cloudy periods with 40% chance of flurries, low -23°C

Thursday (Jan 22)

• Mix of sun and cloud with 30% chance of flurries

• High: -18°C

• Night: Cloudy periods, low -29°C

Wardrobe Recommendations

• This morning: Dress for the wind chill—heavy parka, insulated mitts, toque, and a scarf/neck warmer (face coverage helps a lot).

• This afternoon: Still cold at -16°C—layers are your friend, especially if you’ll be outside for more than a few minutes.

• Tonight/Wed: Keep boots with good tread handy—any flurries or light snow can hide icy patches on sidewalks and parking lots.

Weather Trivia

On clear, sunny winter days, the sun can make it look warmer than it is—but in January, the “feel” is still driven by wind and air temperature. That’s why a bright day can still come with a -30s wind chill in the morning.

Weather Summary

Thunder Bay forecast for January 20, 2026: Mainly sunny with a high of -16°C, but a cold start near -24°C and wind chills near -34 bring frostbite risk. Partly cloudy tonight with a 30% chance of flurries. Periods of light snow arrive Wednesday afternoon.