Thunder Bay – Weather – Thunder Bay is waking up to a true late-season snow day. Environment Canada says a Special Weather Statement remains in effect for the City of Thunder Bay, with periods of snow continuing today, March 31, and additional snowfall amounts of 4 to 8 centimetres possible before the snow tapers off this afternoon or this evening.
The agency warns that visibility may be reduced in heavier snow and that travel could be affected on untreated roads and walkways.
Today’s Weather Overview
Current Conditions
At 7:00 AM EDT at Thunder Bay Airport, conditions were light snow and -3°C, with a temperature of -2.5°C, a dew point of -3.3°C, humidity at 94 percent, and pressure at 101.8 kPa and rising. An east-northeast wind at 15 km/h was producing a wind chill of -7, while visibility had dropped to 3 kilometres in the snow.
This is a colder and more winter-like setup than Thunder Bay saw just a day earlier. Environment Canada’s detailed forecast calls for periods of snow through the day, with about 5 cm expected, a northeast wind near 20 km/h easing this afternoon, and a high of -2°C. Wind chill values will make it feel closer to -9 this morning before improving slightly later today.
Tomorrow’s Forecast
Expected Conditions
Tonight, the snow is expected to end this evening, followed by clearing skies and a sharp drop in temperature. Environment Canada forecasts a low of -14°C, with wind chill values falling to about -17 overnight, which means any slushy or untreated surfaces are likely to refreeze.
Wednesday, April 1 brings a brighter sky but not much warmth. The forecast calls for sunny conditions in the morning, becoming a mix of sun and cloud in the afternoon, with a high of -2°C. It will still feel bitter early, with a morning wind chill near -16 before moderating to around -4 in the afternoon. Wednesday night stays clear and cold with a low of -8°C.
The rest of the week keeps Thunder Bay in a chilly pattern. Thursday is expected to be cloudy with a 60 percent chance of snow and a high of -2°C, followed by periods of snow Thursday night and a low of -4°C. Friday stays cloudy with a 60 percent chance of flurries and a high of 1°C, while the weekend continues unsettled with more chances of snow and highs hovering near freezing.
Tips for Travellers
Today is a day to give yourself more time than usual. Environment Canada says travel may be affected, especially where roads have not been treated, and warns that surfaces may become icy and slippery. Drivers should slow down, increase following distance, clear all snow from windows and lights, and be ready for reduced visibility in heavier bursts of snow. Pedestrians should also watch for slick sidewalks, parking lots, and intersections.
Wardrobe Recommendations
This is still full winter clothing weather in Thunder Bay. A warm coat, hat, gloves, and winter boots are a good choice today, and layers will help with the wind chill. Tonight will be especially cold, so anyone heading out after dark will want heavier outerwear and footwear with good grip for icy patches.
Weather Trivia
Even though it is the last day of March, this kind of cold snap is not out of character for Thunder Bay. Environment Canada lists the city’s normals at 5°C for the daytime high and -6°C for the overnight low, so today’s snowy, below-normal conditions are a reminder that winter often hangs on well into early April along the north shore of Lake Superior.
Synopsis: Thunder Bay weather for March 31, 2026: light snow and -3°C this morning, with 4 to 8 cm of additional snowfall possible today before clearing tonight and colder weather settling in.
