THUNDER BAY – Weather Alert – Thunder Bay is dealing with a slippery end to the day as Environment Canada has issued a Yellow Advisory for freezing drizzle for the City of Thunder Bay. The advisory says areas of freezing drizzle are continuing this evening, with light ice build-up expected to make surfaces icy and slippery and difficult to judge at a glance. Environment Canada rates the impact as moderate and forecast confidence as high.
Today’s Weather Overview
Current Conditions
As of 5:00 PM EDT Saturday at Thunder Bay Airport, conditions were reported as light drizzle with a temperature of 0.1°C. Humidity was sitting at 98 percent, pressure was 100.3 kPa and falling, and an east-northeast wind at 21 km/hwas cutting visibility down to 5 km. That combination paints a raw, damp, near-freezing picture that matches the advisory conditions very closely.
The main concern this evening is not heavy snowfall but the thin, hard-to-see glaze that freezing drizzle can leave behind. Environment Canada warns that icy surfaces are likely to form and could be tough to detect, creating hazards for both drivers and pedestrians.
Tomorrow’s Forecast
Expected Conditions
For tonight, Environment Canada says periods of light snow or freezing drizzle will end late this evening, followed by cloudy skies and a 40 percent chance of flurries. Winds from the northeast at 20 km/h gusting to 40 are expected to ease after midnight. The overnight low will fall to -10°C, with a wind chill near -13.
Sunday, March 22 will stay mainly cloudy with a high of 0°C. Northeastern winds near 20 km/h will become lighter in the afternoon, but the day will start sharply colder, with a morning wind chill near -18. Sunday night remains mostly cloudy before becoming partly cloudy after midnight, with a low of -10°C and a wind chill near -14.
Monday brings a brighter break, with sunny skies and a high of 1°C. After that, the pattern stays unsettled, with flurries Monday night, a 60 percent chance of flurries Tuesday and a high of 1°C, followed by periods of snow Wednesdayand a colder high of -4°C.
Wardrobe Recommendations
This is a night for traction and layers. Waterproof boots with solid grip, a warm coat, gloves, and a hat are the safest choice, especially because freezing drizzle can coat sidewalks, steps, and parking lots with a nearly invisible layer of ice. Sunday will feel more like winter than spring in the morning, so extra layers are still the smart call even with temperatures hovering near zero later in the day.
Weather Trivia
Thunder Bay’s normal temperatures for this time of year are 3°C for the daytime high and -9°C for the overnight low. So Sunday’s forecast high of 0°C is a little below seasonal, while tonight’s -10°C low is close to normal for late March.
Synopsis
Thunder Bay weather for March 21, 2026: Environment Canada has issued a Yellow Advisory for freezing drizzle, warning of icy and slippery surfaces this evening, followed by colder cloudy weather overnight.
