Thunder Bay Weather Focus: Snowy Skies, Slippery Streets, and a Lake Superior Plot Twist
Thunder Bay at a Glance (6:00 PM EST, Thursday, December 25, 2025)
Thunder Bay – Weather – Thunder Bay is wearing its full winter costume tonight: steady snow, low visibility, and that unmistakable “Lake Superior is involved” energy.
At Thunder Bay Airport, it’s -6.3°C (right around -6°C) with snow falling and visibility down to 0.8 km, which is basically Mother Nature’s way of saying, “Slow down, please.”
The wind is out of the east at 22 km/h, pushing the wind chill to -14, so even if the thermometer looks manageable, the air feels like it’s trying to hurry you back indoors. Humidity is 91%, keeping everything damp, clingy, and snow-friendly.
Barometric pressure is 102.3 kPa and falling, a classic sign that the atmosphere isn’t done with us yet.
Tonight: Heavy Snow at Times (Low -4°C)
Thunder Bay is in for snow at times heavy tonight, dipping to -4°C. With the ongoing snowfall and reduced visibility, this is a “take it easy on the roads” kind of evening.
If you are planning travel on Highways 11 and 17, the OPP are advising serious caution.
The falling pressure backs up what you’re seeing out the window—this system still has a bit of work left before it loosens its grip.
Friday, December 26: Snow (High 1°C), Then Cloudy at Night (Low -4°C)
Friday keeps the snow theme rolling with snow and a high of 1°C. That slightly warmer air can make the snow heavier and slicker underfoot—extra charming on sidewalks and driveways.
By Friday night, skies turn cloudy and the temperature drops back to -4°C, meaning anything that melts during the day can refreeze into surprise skating rinks after dark.
Saturday, December 27: Mixed Mood (High 2°C) and a Messy Night (Low -1°C)
Saturday brings a 40% chance of flurries or rain showers with a high of 2°C. That “flurries or rain” wording is winter’s way of shrugging and saying, “Could be pretty, could be sloppy.” Saturday night leans even more into that uncertainty with a 60% chance of flurries or rain showers and a low of -1°C, which is prime territory for wet snow and icy patches.
Sunday, December 28: Flurry Chances, Then a Real Temperature Drop (High 1°C / Low -12°C)
Sunday keeps a 40% chance of flurries and a high near 1°C. Then the bottom starts to fall out Sunday night: 60% chance of flurries with a low of -12°C. That’s the kind of temperature swing that turns leftover moisture into hard-packed ice and makes your car door sound personally offended when you open it.
The Bigger Chill: Monday to Wednesday
Monday stays in “flurry roulette” with a 40% chance and a high of -10°C, followed by a colder night with a 60% chance of flurries and a low of -20°C. Tuesday is colder still, -13°C with a 60% chance of flurries, then clear and -23°CTuesday night. By Wednesday, it’s sunny and -18°C—bright, beautiful, and the exact kind of cold that makes sunshine feel slightly suspicious.
Weather Alert: Yellow Warning – Snowfall (Moderate Impact, High Confidence)
Environment Canada has a Snowfall Warning in effect, noting 15 to 20 cm of snow expected, with locally higher amounts near Lake Superior. The warning highlights reduced visibility in heavy snow and local blowing snow. Areas close to Lake Superior may see gusts up to 60 km/h, which can turn “regular snow” into “where did the road go?” in a hurry. Snow is expected to taper to flurries by Friday morning for most places, though the lakeshore can keep the party going longer.
What to Wear in Thunder Bay
Tonight and Friday are all about staying warm and staying dry. Go with a proper winter coat that blocks wind, plus a scarf or neck warmer—because -14 wind chill finds gaps like it’s doing quality control. Waterproof boots with traction are the real MVP, and if you’re heading out in the heavier snow, add snow pants if you’ll be outside for more than a quick dash. Gloves or mitts are non-negotiable, and a hood (or toque) that actually stays on in wind will save you from the “hat chase” down the driveway.
Travel and Sidewalk Smarts
With visibility under a kilometre and heavy snow at times, plan for slower travel and longer braking distances. If you’re walking, assume sidewalks may be hidden under fresh snow with icy layers beneath—tiny steps win championships on nights like this.
Thunder Bay Weather Trivia
Lake Superior is so big it can create its own localized weather, including enhanced snowfall and blowing snow near shorelines. That’s why Thunder Bay can be dealing with heavier snow while communities farther inland sometimes catch a lighter version of the same system—Superior likes to add “special effects.”
The Last Word:
Thunder Bay faces heavy snow at times tonight with low visibility, falling pressure and a wind chill of -14. Snow continues Friday before colder air returns.
