THUNDER BAY – WEATHER – Thunder Bay starts Sunday morning with light snow and a stiff north-northwest wind that’s keeping it feeling much colder than the thermometer suggests. At 9:00 AM EST, the temperature at Thunder Bay Airport was -9.7°C, but the wind chill was -18 thanks to NNW winds at 22 km/h gusting to 35 km/h. Pressure is rising (103.0 kPa), a sign conditions will stabilize—after we get through this morning’s snow.
Through the rest of today, periods of light snow end this morning, then skies stay mostly cloudy with a 40% chance of flurries. Winds become north 20 km/h gusting to 40, and the high holds near -10°C. With the wind, it will feel closer to -20, especially midday and in open areas.
Tonight is the major headline. Skies turn partly cloudy, winds ease later in the evening, and temperatures plunge to -24°C. Wind chill values drop to around -32 overnight, bringing a risk of frostbite for anyone outdoors for more than a short time. If you’re out this evening, cover all exposed skin—this is the kind of cold that bites quickly.
Monday is bright but still harsh. Expect sunny skies, then a mix of sun and cloud later in the afternoon. The high reaches -12°C, but the morning starts with a wind chill near -32, improving only to around -15 in the afternoon. Monday night turns cloudy with a 40% chance of flurries and a low near -18°C.
By Tuesday, snow returns with periods of snow and a milder high near -6°C, followed by a night with a 60% chance of flurries and a low near -13°C.
Wardrobe and Safety Notes
Today’s wind makes it feel raw—wear a wind-resistant outer layer, warm hat, and mitts. Tonight and Monday morning, step it up: face covering or neck gaiter, insulated boots, and limit time outdoors. Also keep an eye on refreeze where today’s light snow and road moisture compact down—slick spots can show up fast after sunset.
Summary
Thunder Bay weather forecast for Sunday, February 22, 2026: light snow ends this morning, then cloudy with a 40% chance of flurries and a high of -10°C. A deep freeze tonight drops to -24°C with wind chills near -32 and frostbite risk. Sunny but bitter Monday, snow returns Tuesday.
