Thunder Bay – Weather – Well, here we go, a weather roller coaster, cold nights with warmer daytime temperatures.

Thunder Bay is starting Thursday in true winter form—mainly clear and -19°C—but the forecast is pointing straight toward a mid-February warm-up. That’s good news for anyone tired of deep cold, but it also means slushy sidewalks, messy roads, and gritty spray that can quickly turn your windshield into a blurry mess.

Keep the winter windshield washer fluid topped up—you’re going to use it.

Today’s Weather Overview

Current Conditions

At 5:00 AM EST, Thunder Bay is mainly clear with:

• Temperature: -18.8°C

• Wind: WSW 5 km/h

• Wind Chill: -23

• Humidity: 86%

• Pressure: 102.8 kPa and rising

• Visibility: 24 km

It’s a crisp, cold start, but the rising pressure and sunshine help set up a calmer day.

Today (Thursday)

A bright, dry day overall:

• Sky: Sunny

• Wind: Up to 15 km/h

• High: -2°C

• Wind Chill: -21 this morning, improving to about -4 this afternoon

• UV Index: 1 (Low)

Even with sunshine, the morning still has bite—cover exposed skin if you’re outside for more than a few minutes.

Expected Conditions (Next 3 Days)

Tonight (Thu night)
Partly cloudy with a 30% chance of flurries before morning.

• Low: -10°C

• Wind: Up to 15 km/h

• Wind Chill: -8 this evening, near -15 overnight

Friday, February 13
Cloudy with a 30% chance of morning flurries, then trending milder.

• High: +2°C

• Wind: Becoming NW 20 km/h in the morning

• Wind Chill: Near -14 in the morning

• Night: Cloudy periods, low -8°C

Saturday, February 14

• Sky: A mix of sun and cloud

• High: 0°C

• Night: Cloudy, low -6°C

Sunday, February 15

• Cloudy

• High: +1°C

• Night: Cloudy, low -5°C

Trend note: This is the classic “warm right up” pattern—daytime temps near or above freezing, with nights dipping below. That’s prime time for slush by day and refreeze at night.

Wardrobe Recommendations

• Today: Winter layers still matter—warm coat, hat, and mitts for the morning wind chill.

• Friday through Sunday: Dress for wet and messy conditions. A water-resistant outer layer and boots with solid traction will help with slush and puddles.

• Keep extra gloves in the car—once snow starts melting, everything gets damp fast.

Road & sidewalk heads-up: Near-freezing days often mean slippery intersections and parking lots when meltwater refreezes after sunset.

Weather Trivia

When temperatures hover around 0°C, you can actually get more slippery conditions than during deep cold. The melt creates water on top of packed snow or ice, and then a quick evening drop turns it into a thin glaze—hard to see, easy to slip on.

Thunder Bay Weather Summary

Thunder Bay weather for Thursday, February 12, 2026: mainly clear and -19°C this morning, sunny today with a high of -2°C. Warming trend continues with flurries possible tonight and Friday morning, reaching +2°C Friday and near 0 to +1°C this weekend—expect slush and refreeze, and keep windshield washer fluid topped up.