Thunder Bay – WEATHER – The city is waking up to a crisp March morning under mostly cloudy skies. Barametric pressure is rising, which usually supports improving conditions, and that shows up in today’s outlook: clouds break this morning, and flurries fade out. A quick warm-up arrives Wednesday, but nights stay sharply cold.
Current Conditions (Observed 8:00 AM EDT, Tuesday March 10, 2026)
Thunder Bay is mostly cloudy with cold air still in place.
-
Temperature: -8.2°C (about 17°F)
-
Wind: NE 12 km/h
-
Wind Chill: -14
-
Pressure: 102.3 kPa (rising)
-
Humidity: 67%
-
Dew Point: -13.2°C
-
Visibility: 32 km
Today (Tuesday)
-
Sky: Mainly cloudy early with a 30% chance of flurries, then clearing this morning
-
Wind: Up to 15 km/h
-
High: -4°C
-
Wind chill: -14 this morning, improving to about -8 this afternoon
-
UV Index: 3 (Moderate)
Expected Conditions (Next Three Days)
Tonight (Tuesday Night)
-
Sky: Increasing cloudiness
-
Wind: Up to 15 km/h
-
Low: -13°C
-
Wind chill: Near -12 this evening
Wednesday, March 11
-
Sky: A mix of sun and cloud, clearing late morning
-
Wind: Becoming NW 20 km/h gusting to 40 late morning
-
High: +3°C
-
Wind chill: Near -16 in the morning
-
UV Index: 2 (Low)
-
Night: Clear, low -13°C
Thursday, March 12
-
Sky: A mix of sun and cloud
-
High: -1°C
-
Night: 60% chance of flurries, low -10°C
Wardrobe Recommendations
-
This morning: Dress for wind chill -14—winter coat, warm gloves, and a hat are still needed.
-
This afternoon: With clearing skies and -4°C, layered clothing works best (warm mid-layer under a lighter winter shell).
-
Tonight: Temperatures drop to -13°C, so keep winter gear ready if you’re out late.
-
Wednesday: Start winter-dressed for the -16 wind chill, then be ready to shed layers as temps climb to +3°C and winds pick up.
Weather Trivia
In March, a “two-season day” is common: cold air hangs on overnight, then sunshine and daytime mixing can bring a quick warm-up. That’s why you can see big swings between morning wind chill and afternoon temperature—even within 6–8 hours.
Weather Summation
Thunder Bay weather forecast for Tuesday, March 10, 2026: -8°C this morning with a wind chill of -14 and rising pressure. Clearing expected this morning with a high of -4°C. Tonight drops to -13°C. Wednesday brings a brief warm-up to +3°C with northwest wind gusts up to 40 km/h, followed by colder nights again.
