A Chilly but Bright Start to the Day
Thunder Bay starts off this Thursday morning with clear skies and a temperature of -8.9°C. The humidity sits at 93%, so there’s a crispness to the air, but at least visibility is excellent at 24 km. Winds are light from the northwest at 4 km/h, giving a wind chill of -11°C—not unbearable, but enough to make you reach for your winter coat. The barometric pressure is rising at 101.1 kPa, suggesting a brief period of stability before conditions change.
As the morning progresses, expect clouds to increase, though the fog patches will dissipate. The wind will stay light, reaching 15 km/h, and temperatures will climb to a high of 5°C. The UV index is moderate at 3, so if you’re spending time outdoors, sunglasses might come in handy.
Tonight: A Mixed Bag of Flurries, Rain, and Possible Freezing Rain
Clouds will dominate the night sky, bringing a 40% chance of either flurries or rain showers. There’s also a risk of freezing rain overnight, which could make for slick roads by morning. Winds will pick up from the east at 20 km/h, and temperatures will remain relatively mild, with a low of 0°C.
Friday: Showers and a Possible Thunderstorm?
Friday will be mainly cloudy, with a 40% chance of showers in the morning and early afternoon. By the afternoon, showers will become more widespread, and there’s even a risk of a thunderstorm late in the day—an early taste of spring! Winds from the east at 20 km/h will keep things breezy, and the temperature will rise to 6°C. The UV index remains moderate at 3.
Friday night will stay cloudy, with a 60% chance of showers, and temperatures will remain unusually warm, with a low of 6°C.
Weekend Weather Rollercoaster: Rain, Snow, and a Deep Freeze
Saturday will be a rainy one, with a high of 9°C, but by Saturday night, winter fights back. Expect periods of rain or snow, blowing snow, and strong winds as temperatures plummet to -8°C.
Sunday will feel much colder, with a mix of sun and cloud and a 30% chance of flurries. The high will only reach -1°C, and the night will be clear but frigid, dropping to -16°C.
Monday sees a mix of sun and cloud with a 40% chance of flurries, with a slight rebound to 1°C. Monday night will be cloudy with a low of -10°C.
What to Wear?
For today, a warm coat, gloves, and a hat will keep you comfortable in the chilly morning air, but you may want to shed a layer by the afternoon. Tonight and Friday call for waterproof gear and grippy footwear, as rain, freezing rain, and even a possible thunderstorm could make for a messy day. By Saturday night and Sunday, it’s back to full winter gear as temperatures plunge and blowing snow develops.
Thunder Bay Weather Trivia!
Did you know that March 13, 2012, was one of the warmest on record in Thunder Bay, hitting 13.5°C? Compare that to March 13, 1975, when the city shivered through a brutal -32.8°C! This year, we’re seeing a little bit of everything—sun, rain, snow, and even a possible thunderstorm, proving once again that March weather in Northwestern Ontario can’t make up its mind!
