Thunder Bay – Weather – The weather outlook is starting Thursday with light snow, a sharp winter chill, and a forecast that still looks more like March than spring. The good news is that the light snow should taper off later this morning, with clearing skies expected this afternoon.
The bigger story beyond today is the temperature swing ahead: a cold Friday, a brighter Saturday, and then a dramatic jump to 12°C under cloudy skies on Sunday.
Today’s Weather Overview
Current Conditions
As of 6:00 AM EDT Thursday, March 26, 2026, Thunder Bay was reporting light snow and a temperature of -7.1°C, rounded to -7°C on the forecast page. Winds were from the north at 6 km/h, producing a wind chill of -10. Humidity was 79 percent, barometric pressure was 101.3 kPa and rising, and visibility was 16 km.
That all adds up to a cold, unsettled early morning, but not a major storm situation. The rising pressure suggests improving conditions later in the day, and that matches the forecast.
Environment Canada’s forecast calls for periods of light snow ending late this morning, then clearing. Winds will strengthen from the north to 20 km/h gusting to 40 this morning. The daytime high will reach -3°C, with a wind chill near -15 this morning and around -9 this afternoon.
Tomorrow’s Forecast
Expected Conditions
Tonight turns sharply colder. Skies will become clear, and north winds at 20 km/h gusting to 40 will ease this evening. The low will fall to -16°C, with a wind chill near -22 overnight.
Friday, March 27 brings a mix of sun and cloud, along with a 30 percent chance of flurries late in the morning and in the afternoon. Winds will become northwest 30 km/h gusting to 50 late in the morning, making it feel much colder than the thermometer suggests. The high will be -4°C, with a morning wind chill near -22 and an afternoon wind chill around -11.
Friday night features cloudy periods and a low of -11°C.
Saturday, March 28 looks much better, with sunny skies and a high of 2°C. Saturday night turns cloudier, with a low of -5°C.
Then comes the standout forecast day: Sunday, March 29 is expected to be cloudy with a high of 12°C, a major shift from the current cold pattern. Sunday night clears out again, with temperatures dropping back to -9°C.
Wardrobe Recommendations
Thursday and Friday are still full winter-jacket days. A warm coat, gloves, hat, and insulated footwear are the best choice, especially with gusty north and northwest winds and wind chills dropping well into the minus teens and lower. Saturday may feel more comfortable in the sunshine, but layers will still be important. Sunday is the wild card — if the forecast high of 12°C holds, many people may be tempted into spring clothing, but the cool morning and evening still make a layered outfit the smarter plan.
Weather Trivia
Late March in Thunder Bay can be one of the most dramatic times of year for temperature swings. It is not unusual to move from light snow and sub-zero wind chills to double-digit warmth within just a few days. That push and pull between lingering Arctic air and arriving spring systems is one of the classic features of Northwestern Ontario weather.
Synopsis
Thunder Bay weather update for March 26, 2026: light snow ends this morning before clearing, followed by a frigid night, a cold Friday, sunny skies Saturday, and a surprising warmup to 12°C on Sunday.
