Could the First Taste of Spring Be on the Way?

Thunder Bay – Weather – Thunder Bay is starting Wednesday under light snow and a cold, damp air mass. The bigger story over the next few days is a gradual shift toward milder temperatures—but it comes with “shoulder-season” hazards: flurries, and later, a snow-or-rain mix that can create slushy roads by day and icy patches at night.

Current Conditions (Observed 8:00 AM EDT, Wednesday March 18, 2026)

• Temperature: -9.2°C (headline: -9°C)

• Condition: Light snow

• Wind: NNW 4 km/h

• Wind Chill: -11

• Pressure: 101.1 kPa (falling)

• Humidity: 90%

• Dew Point: -10.6°C

• Visibility: 24 km

Today (Wednesday)

• Morning: Periods of light snow ending early, then cloudy

• Late day: 30% chance of flurries late this afternoon

• Wind: Becoming southwest 20 km/h late this morning

• High: -1°C

• Wind Chill: Near -12 this morning, improving to about -3 this afternoon

• UV Index: 2 (Low)

Expected Conditions (Next Three Days)

Thursday, March 19

• Morning: Clearing in the morning

• High: +1°C

• Wind: Up to 15 km/h

• Wind Chill: Near -14 in the morning

• UV Index: 3 (Moderate)

• Night: Periods of snow or rain, low -7°C

Friday, March 20

• Day: Cloudy, high +3°C

• Night: Cloudy with 60% chance of snow or rain, low -2°C

Saturday, March 21

• Day: Periods of rain or snow (70% chance shown in the outlook), high +1°C

• Night: 30% chance of flurries, low -7°C

Wardrobe Recommendations

• Today: Dress for cold + damp. A warm winter coat, toque, and gloves still matter at -9°C, especially with snow in the air.

• Thursday and Friday: Temperatures climb above freezing in the daytime—go with layers and consider a water-resistant outer layer for slush and mixed precipitation.

• Nights: With lows dipping below zero, watch for refreeze. Boots with good traction are a smart choice for sidewalks and parking lots.

Weather Trivia

“Near-zero” days are often the most slippery. When snow mixes with rain, roads can turn slushy, and then a quick temperature drop overnight can refreeze that moisture into black ice—especially on bridges and shaded side streets.

Summary

Thunder Bay weather report for Wednesday, March 18, 2026: light snow early and -9°C at 8:00 AM with falling pressure. Snow ends early, then cloudy with a 30% chance of flurries and a high of -1°C. Thursday clears to +1°C, but mixed snow or rain returns Thursday night into the weekend with rising daytime highs and refreeze risk overnight.