Bundle up, Thunder Bay – the flurries are flirting, and tonight the snow makes its move.

Thunder Bay Weather Outlook – Monday, December 8, 2025

Cold Morning Calm Before a Light Snowfall Tonight

Thunder Bay – WEATHER DESK – Heading into the office this morning, and seeing a windchill at -29°C, almost hit the pause button, on the walk! However the weather while chilly isn’t bad if you are dressed for it.

Thunder Bay is waking up to a frosty start this Monday with -23.1°C at 6:00 AM EST and a wind chill of -29°C. Skies are mostly cloudy, and while things might look quiet outside, don’t be fooled — the wind from the west at 6 km/h is making it feel much cooler.

With humidity at 78% and a dew point of -25.9°C, the atmosphere is primed for a weather change.

Visibility is excellent at 24 km, and barometric pressure sits at 103.0 kPa, though it’s falling, indicating snow is on its way.

Expect increasing cloudiness throughout the morning and a 30% chance of light flurries by late afternoon. The daytime high is expected to reach -7°C, but wind chills will stay near -28°C this morning, improving to -11°C by the afternoon. Frostbite risk remains high, especially this morning.

Tonight: Snow Arrives, Light but Noteworthy

Tonight, the clouds thicken and the snow makes its entrance. Expect a 30% chance of flurries early in the evening, followed by steady snow beginning later tonight, with a local snowfall of around 5 cm expected by morning. Temperatures will hover near -11°C, with wind chills dropping to -15°C overnight. Winds stay light at up to 15 km/h, but visibility may be reduced once the snow begins to fall steadily.

Tuesday and Beyond: On-and-Off Flurries and Cold Comfort

Tuesday will feature a mix of sun and cloud, with a 30% chance of flurries early in the day. The high will reach -8°C, and while winds remain calm, the wind chill will still feel like -17°C in the morning and -11°C in the afternoon.

Tuesday night stays partly cloudy, with a 40% chance of flurries and a low of -16°C. Midweek brings more of the same — Wednesday and Thursday will be a mix of sun and cloud, with highs around -10°C to -11°C, and overnight lows dipping into the -17°C to -18°C range.

Looking ahead to Friday and the weekend, we’re back into scattered flurry territory, with highs in the minus teens and more overnight cold — winter in Thunder Bay is in full stride.

What to Wear

It’s a “face-freezes-in-5-minutes” kind of morning, so don’t cut corners:

• Insulated parka with hood

• Thermal base layers

• Waterproof mitts, toque, scarf

• Winter boots with thick socks

• Add face covering or balaclava for wind protection
  Bonus tip: Keep your car survival kit stocked — cold snaps like this don’t forgive a stalled battery.

❄️ Weather Trivia Time!

Thunder Bay sits at the head of Lake Superior, which means it often escapes the worst of the lake-effect snow, but not the cold. Interestingly, Thunder Bay often sees more sunshine in winter than Toronto — but those clear skies come with colder temperatures, especially when there’s snow on the ground to reflect that sunlight right back into your eyes!