THUNDER BAY – WEATHER – Thunder Bay is starting April with a sharp shot of cold instead of spring warmth. As of 8:00 AM EDT, your local update showed a bitter -17°C, and Environment Canada’s latest official observation from 7:00 AM EDT at Thunder Bay Airport reported clear skies, -16.2°C, a pressure of 103.2 kPa and rising, humidity at 85 percent, light west-northwest wind, and a wind chill near -18. After Tuesday’s snow, the city has turned much colder under a stronger high-pressure system.
One important change from yesterday: there are no alerts in effect for the City of Thunder Bay as of 8:00 AM EDT Wednesday, April 1. That means the Tuesday special weather statement has ended, even though the region is not done with unsettled weather yet.
Today’s Weather Overview
Current Conditions
This morning’s weather has more of a mid-winter feel than an early April one. Environment Canada says Wednesday will be sunny to start, with increasing cloudiness late this afternoon, a high of -3°C, and wind chills making it feel near -19 this morning before easing to around -7 this afternoon. Even with sunshine, it will stay cold enough that snowbanks, icy sidewalks, and shaded roads are slow to soften.
Tomorrow’s Forecast
Expected Conditions
Tonight turns mainly cloudy, with east wind increasing to 20 km/h before morning and a low of -6°C. The wind chill is expected to sit near -10, so the evening will still feel sharply cold for anyone out late.
Thursday, April 2 is the next weather-maker to watch. Environment Canada calls for cloudy skies with snow beginning in the afternoon, about 5 cm of accumulation, and a northeast wind of 30 km/h gusting to 50. The high will be -1°C, but with the wind it will feel closer to -10. That combination points to a raw, unpleasant day with snow returning and visibility likely dropping at times.
Thursday night stays unsettled with periods of snow and a low of -4°C. Friday remains wintry as well, with periods of snow and a high of 1°C, followed by a 30 percent chance of flurries Friday night and a low of -5°C. The longer-range forecast keeps snow chances in play into Saturday and cooler-than-normal conditions through early next week.
Wardrobe Recommendations
This is still full winter clothing weather in Thunder Bay. A heavy coat, gloves, hat, and insulated boots are the right call this morning, especially with wind chills near -19. For Thursday, add waterproof outerwear if you are commuting or running errands, because the returning snow and gusty northeast wind will make it feel much harsher than the thermometer suggests.
Travel Outlook
Today’s travel conditions should improve compared with Tuesday, thanks to the clearing and lack of active alerts, but the cold means any leftover slush can refreeze into slick spots. Thursday looks more troublesome again as snow develops in the afternoon and winds gust up to 50 km/h. Drivers should leave extra stopping distance, keep headlights on in falling snow, and be ready for changing road conditions late Thursday into Friday.
Weather Trivia
Thunder Bay’s normal temperature for this time of year is about 6°C for the daytime high and -6°C for the overnight low, so this morning’s deep cold is well below seasonal norms. It is another reminder that on the north shore of Lake Superior, winter often keeps a grip well into the first week of April.
Overview: Thunder Bay weather for April 1, 2026: bitter cold near -17°C this morning, no active alerts, then increasing cloudiness today before snow returns Thursday with about 5 cm and gusty northeast winds.
