Thunder Bay – Weather – Winter seems to be very comfortable in Thunder Bay this year. Unlike past years, where by now the signs of spring were evident, this year it seems the snow is loving it. Perhaps looking for a silver lining, the fire season won’t be as severe.
Thunder Bay is waking up to another messy late-March day, with light snow already falling and visibility reduced across the city. The forecast points to a wet, slushy daytime period before another round of snow develops tonight, along with a risk of freezing rain overnight. It is a classic Northwestern Ontario spring setup, where mild daytime readings and winter precipitation continue to battle for control.
Current Conditions
At 8:00 AM EDT on Wednesday, March 25, Thunder Bay was reporting light snow and a temperature of -1.3°C, rounded to -1°C on the forecast page. Humidity was high at 97 percent, with an east wind at 14 km/h creating a wind chill of -6. Pressure was 101.5 kPa and falling, a sign of unsettled conditions continuing across the region. Visibility was reduced to 2 km in the snow.
Through the day, periods of snow are expected to continue before easing this afternoon. Environment Canada’s forecast calls for about 5 cm of snowfall today, followed later by cloudy skies and a 40 percent chance of flurries or rain showers. The high will reach 4°C, which means some areas could turn slushy as temperatures climb above freezing.
Extended Forecast
Expected Conditions
Tonight stays unsettled. The forecast calls for cloudy skies this evening, a 40 percent chance of flurries or rain showers, then periods of snow beginning late this evening. There is also a risk of freezing rain overnight, which could make roads, sidewalks, and parking lots slippery. About 2 cm of additional snowfall is expected, with a low of -7°C.
Thursday, March 26 remains wintry. Periods of snow will continue into the afternoon before tapering off to mainly cloudy skies. Winds will shift north to 20 km/h in the afternoon, and the high will only reach -3°C. That means conditions will feel much colder, with wind chills near -8 in the morning and dropping to around -13 in the afternoon.
Thursday night turns sharply colder and clear, with a low of -18°C.
Friday brings a welcome break, with sunny skies and a high of -3°C. The weekend looks better, with a mix of sun and cloud on Saturday and a high of 2°C, then sunshine and a high of 5°C on Sunday.
Wardrobe Recommendations
Today is a day for waterproof outerwear and solid footwear. With snow falling this morning and temperatures expected to rise above freezing this afternoon, sidewalks and roads could become wet and slushy. Tonight and early Thursday call for extra caution, as the freezing-rain risk may leave icy patches under fresh snow. A warm coat, boots with grip, gloves, and a hat are still the right call.
Weather Trivia
Late March in Thunder Bay often produces some of the most changeable weather of the year. It is not unusual to see snow, rain, slush, freezing rain, and sunshine all within the same three-day stretch. That tug-of-war between lingering winter cold and arriving spring warmth is one of the defining features of northwestern Ontario weather.
Conclusion
Thunder Bay weather for March 25, 2026: light snow and reduced visibility this morning, 5 cm of snow expected today, then more snow tonight with a risk of freezing rain before colder weather returns Thursday.
