THUNDER BAY – WEATHER – Thunder Bay is starting Sunday with a damp, chilly feel, as mist and reduced visibility greet the city at mid-morning. The near-term outlook is fairly calm today, but the pattern turns more unsettled on Monday and Tuesday, when snow chances increase before sunshine returns by midweek.
Environment Canada observed -8.2°C at Thunder Bay Airport at 9:00 AM EDT, with high humidity, light west wind, and falling pressure.
Today’s Weather Overview
Current Conditions
At 9:00 AM EDT on Sunday, March 29, Thunder Bay was sitting at -8.2°C under misty conditions. Humidity was 93 percent, pressure was 102.1 kPa and falling, and a west wind at 6 km/h was producing a wind chill of -11. Visibility was reduced to 5 kilometres, giving the morning a grey, muted look around the city and waterfront.
Environment Canada says fog patches will dissipate this morning, leaving a mix of sun and cloud through the day. Winds should remain light, up to 15 km/h, with a daytime high near +1°C. Even with the modest warm-up, it will still feel sharply colder early on, with a morning wind chill near -16.
Extended Weather Forecast
Expected Conditions
Monday, March 30 brings a cloudier and more active setup. Thunder Bay is expected to see a 60 percent chance of snow in the afternoon, with northeast winds increasing to 20 km/h in the morning. The high will be around 0°C, but it will feel closer to -9 in the morning. Snow becomes more organized Monday night, with periods of snow and a low of -4°C.
Tuesday, March 31 stays wintry. Periods of snow are forecast during the day, with a high of -4°C. Tuesday night remains cold and unsettled, with cloudy skies, a 60 percent chance of flurries, and a sharp drop to -15°C. By Wednesday, April 1, conditions improve significantly, with sunny skies and a high of -1°C, followed by a clear night and a low of -11°C.
Wardrobe Recommendations
Sunday morning still calls for full winter gear. A warm coat, gloves, and a hat are a good idea, especially early in the day when wind chill remains in the double digits below zero. For Monday and Tuesday, waterproof boots and an outer layer that can handle light snow will be the smarter choice.
By Wednesday, the sunshine will help, but it will still be cold enough that most people will want a proper jacket rather than a light spring layer.
Weather Trivia
Here is a late-March Thunder Bay reality check: the normal temperature range listed by Environment Canada for this time of year is a high of 5°C and a low of -7°C. That means Sunday’s forecast high of +1°C is running about 4 degrees below the seasonal daytime norm, showing that winter still has a firm grip on Northwestern Ontario at the end of March.
Overview
Thunder Bay weather for Sunday, March 29, 2026: misty and cold this morning at -8°C, then a mix of sun and cloud today before snow chances build Monday and Tuesday.
