Blustery Morning, Clearing Skies, and a Gradual Warm-Up
Thunder Bay starts at -10°C with light snow and wind chills near -19°C. A major warm-up arrives midweek, with highs reaching 10°C by Friday before winter returns
Thunder Bay is waking up to light snow and a temperature of -10.3°C this morning, but the real bite comes from the wind. With northwest gusts reaching 37 km/h, the wind chill has plunged to -19°C.
Humidity sits at 58%, and the pressure is at 101.2 kPa and rising, signalling improving conditions ahead.
Visibility remains strong at 24 km despite the early flurries.
As the day progresses, expect skies to clear, with a 30% chance of flurries lingering early this morning. The northwest wind at 20 km/h, gusting to 40 km/h, will gradually lighten this afternoon.
The high will reach -4°C, but the wind chill will make it feel like -23°C in the morning before improving to -8°C in the afternoon. The UV index is moderate at 3, so while you won’t feel the warmth, some sun protection wouldn’t hurt.
Tonight, clear skies will dominate before some clouds roll in around midnight. Winds will remain light at 15 km/h, and the temperature will dip to -10°C. Wind chills will hover around -8°C in the evening and -13°C overnight, making for another chilly night.
Midweek: A Taste of Spring Arrives
Wednesday brings mainly cloudy skies with a 40% chance of flurries, but temperatures will finally climb above freezing. Winds will stay light, up to 15 km/h, allowing the high to reach +1°C. However, the morning will still be brisk, with a wind chill of -12°C. The UV index remains at 3.
Wednesday night will be clear, with a low of -7°C—cold, but nothing compared to the deep freeze Thunder Bay has endured.
By Thursday, the warming trend continues, with increasing cloudiness and a high of +3°C. The night remains relatively mild, with a low of +1°C and a 30% chance of rain showers or flurries.
Looking Ahead: A Spring Warm-Up with Wet Weather
Friday will bring a mix of sun and clouds with a 40% chance of showers and a very mild high of 10°C. However, rain is expected Friday night, with temperatures staying unseasonably warm at 7°C.
Saturday will continue the wet weather, with rain throughout the day and a high of 8°C. The night will see a shift back toward winter, with periods of rain or snow and temperatures dropping to -9°C.
Sunday brings a return to colder conditions, with cloudy skies and a 40% chance of flurries. The high will be -3°C, and the night will be bitterly cold, plunging to -17°C.
What to Wear?
Today still calls for full winter gear—a warm coat, gloves, and a hat are essential with wind chills dipping near -23°C this morning. By Wednesday, layers will still be necessary in the morning, but by the afternoon, a lighter jacket might suffice. By Thursday and Friday, a spring coat or rain-resistant clothing will be more practical as temperatures climb. However, winter gear may be needed again by the weekend as colder air returns.
Thunder Bay Weather Trivia: March’s Mood Swings
March in Thunder Bay has delivered some wild weather swings over the years. The warmest March 11 on record was a balmy 12.5°C in 2012, while the coldest was a frigid -32.6°C in 1965. This week is a classic example of March’s unpredictability—going from frigid wind chills today to spring-like temperatures near 10°C by Friday, before winter makes a comeback on Sunday.
