THUNDER BAY – WEATHER – Thunder Bay starts Tuesday in a hard Arctic chill with a wind chill near -30, but the weather will turn more active as cloud increases and snow spreads in this morning. Totals look light (around 2 cm), yet the cold remains the bigger concern—especially for anyone working or commuting outdoors.

Remember, it is just as cold for your pets and livestock. Your dogs and cats will get just as cold as you in this weather.

Today’s Weather Overview

Current Conditions (Thunder Bay Airport)

At 7:00 AM EST, Thunder Bay Airport is reporting:

• Mainly clear skies

• Temperature: -20.8°C (about -21°C)

• Wind: W 14 km/h

• Wind chill: -30

• Humidity: 68%

• Visibility: 24 km

• Pressure: 102.4 kPa, falling

Today (Tuesday)

• Increasing cloudiness

• Periods of snow beginning this morning

• Local snow amount: ~2 cm

• Wind: up to 15 km/h

• High: -12°C

• Wind chill: -29 this morning, easing to about -18 this afternoon

• Risk: Frostbite this morning (especially with exposed skin)

Tomorrow’s Forecast

Expected Conditions (Next Three Days)

Tonight (Tuesday night)

• Snow ends this evening, then mainly cloudy with a 40% chance of flurries

• Wind: NW 20 km/h, becoming light before morning

• Low: -16°C

• Wind chill: -18 this evening, near -23 overnight

Wednesday, December 31

• Mix of sun and cloud, becoming sunny in the morning

• Wind: NW 20 km/h early afternoon

• High: -15°C

• Wind chill: -23 morning, near -29 in the afternoon

• Risk: Frostbite possible again with wind + cold

Thursday, January 1

• Mix of sun and cloud with a 40% chance of snow

• High: -15°C

• Night: Cloudy periods, 30% chance of snow, low -19°C

Wardrobe Recommendations

• This morning (wind chill -30): Windproof winter coat, warm mid-layer, toque, thick mitts, and a neck warmer/face covering. Cover exposed skin.

• Snow this morning: Add a waterproof outer layer and winter boots with grip—light snow can still make sidewalks slick.

• Evening dog walks/errands: Dress for wind chill in the -20s overnight.

Weather Trivia

Thunder Bay can feel extra cold on clear mornings because dry Arctic air and overnight cooling let heat escape quickly. Once wind picks up, the wind chill “drops the hammer,” even if the thermometer doesn’t change much.

Last Word on December 30 2025 Weather

Thunder Bay weather forecast for Tuesday, Dec. 30, 2025: -21°C this morning with wind chill near -30 and frostbite risk. Clouds increase with periods of snow beginning this morning (~2 cm). Flurries possible tonight, then cold but brighter conditions Wednesday and a chance of snow New Year’s Day.