THUNDER BAY – WEATHER – Thunder Bay is starting Sunday near the freezing mark, but don’t let the 0°C fool you—strong north winds will build this morning and temperatures will fall sharply to around -8°C this afternoon.

A quick-hit round of snow tonight adds a fresh coating, and wind chills dip into the -20s overnight.

Today’s Weather Overview

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

• Condition: Mostly cloudy

• Temperature: -0.2°C (near 0°C)

• Humidity: 99%

• Wind: NNW 4 km/h (light early)

• Wind chill: -1

• Visibility: 24 km

• Pressure: 101.1 kPa and rising

Today (Sunday)

• Cloudy, with a 30% chance of flurries

• Wind: Becoming north 30 km/h gusting to 50 this morning

• Temperature: Falling to -8°C this afternoon

• Wind chill: Near -16 this afternoon

Tomorrow’s Forecast

Expected Conditions (Next Three Days)

Tonight (Sunday night)

• Periods of snow (about 2 cm)

• Wind: North 30 km/h gusting 50

• Low: -14°C

• Wind chill: Around -23 overnight

Monday, December 29

• Cloudy, 30% chance of flurries in the morning, then clearing in the afternoon

• Wind: NW 30 km/h gusting 50

• High: -11°C

• Wind chill: Near -25

• Monday night: Clear, low -20°C

Tuesday, December 30

• Cloudy with 40% chance of flurries

• High: -10°C

• Night: Cloudy, low -18°C

Wardrobe Recommendations

• This morning: Waterproof winter coat or shell over insulation—near-zero temps + high humidity can feel damp and chill you quickly.

• This afternoon (gusty north wind): Add a warmer mid-layer and wind protection (scarf/neck warmer). Wind chill drops fast.

• Tonight/Monday: Mitts over gloves, insulated boots, and cover exposed skin—wind chills in the -20s can bite.

Weather Trivia

Thunder Bay’s biggest “gotcha” days often happen when temperatures hover near 0°C and then plunge—any damp surfaces can refreeze quickly once colder air and wind arrive, creating surprise slick spots.

Weather Focus – Last Words

Thunder Bay weather forecast for Sunday, Dec. 28, 2025: near 0°C this morning with increasing north winds gusting 50 km/h and temperatures falling to -8°C this afternoon. Periods of snow tonight (about 2 cm) with wind chills near -23, then colder, breezy conditions Monday.