Up to 25 cm of Snow on the Way – Get Ready for a Classic Lake Superior Special
Thunder Bay is under a Snowfall Warning with 15–25 cm of snow expected by Monday morning. Travel conditions will worsen as snow becomes heavy today!
Thunder Bay, ON – Sunday, March 23, 2025 – Spring may be on the calendar, but Old Man Winter is clearly staging a dramatic comeback in Thunder Bay. A Snowfall Warning is in full effect, with 15 to 25 cm of snow expected today through Monday morning. If you’re heading outside—whether to shovel, sled, or just survive—know this: visibility will drop, roads will get slick, and the snow globe effect is very, very real.
Current Conditions – Calm Before the (Snow) Storm
As of 5:00 AM EDT, it’s -8.0°C at Thunder Bay Airport under mostly cloudy skies. Winds from the northeast are light at 5 km/h, giving a wind chill of -11°C. Humidity is at 79%, and the barometric pressure is at 101.6 kPa and falling, a surefire sign of a system building strength. Visibility remains wide at 24 km—for now.
Sunday Forecast – Snow at Times Heavy with Gusty Winds
Get ready for a classic Lake Superior weather flex. Snow will begin this morning and become heavy at times through the day. 10 to 15 cm of accumulation is expected by tonight, with the highest totals likely in higher terrain. Winds will pick up, shifting to the southeast at 20 km/h and gusting to 40 km/h, pushing that snow around and reducing visibility. The high will reach 0°C, but it’ll feel much colder thanks to a wind chill of -16°C this morning and -5°C through the day. The UV index sits low at 1—not much sun to worry about, unless you count the kind that hides behind heavy snow clouds.
Tonight – Snow Keeps Falling Into Monday
Another 5 cm is expected tonight before snow tapers off early Monday. Winds will shift from southeast to north at 20 km/h overnight, with a low of -3°C. Wind chill values will hover around -8°C, and visibility may continue to drop in bursts of heavier snow.
Monday and Tuesday – Slowly Clearing Skies and Warming Temps
Monday starts cloudy with a 40% chance of flurries in the morning. Winds from the northwest at 20 km/h will ease off by midday. The high will reach +1°C, but the morning wind chill will make it feel like -9°C. UV index remains low at 1.
By Monday night, skies will clear, and temperatures will dip to a brisk -13°C.
Tuesday marks the real reward after all that shoveling: sunshine and a high of +4°C, a true taste of spring at last. Skies will stay clear into the evening, with a low of -10°C.What to Wear – Snowstorm Style Mode: Activated
Today is all about full winter defence. Insulated layers, waterproof boots, gloves, a thick scarf, and a hat are absolute musts. If you’re venturing out, goggles or sunglasses can help cut down on snow glare (and flying flakes). Monday will ease up slightly, but Tuesday finally offers an excuse to loosen the zippers—just a little.
Thunder Bay Weather Lore – March Madness Is Real
On this day in Thunder Bay’s weather history, the warmest March 23rd reached a springlike 12.4°C in 2012. The coldest plunged to -27.5°C in 1974. So, while today’s snowstorm might feel excessive, it’s right in line with Thunder Bay’s reputation for throwing snow at you just when you were dreaming of tulips.
