Thunder Bay Weather Forecast – April 7, 2025
Thunder Bay woke up to a slick surprise this morning. Last night’s quick-hit snow left behind a thin sheet of ice on many roadways and sidewalks, making for a Monday morning shuffle rather than a stride.
City crews are out salting the streets, but if you’re stepping out, move with care—or risk performing an unplanned pirouette.
As of 7:00 AM EDT at Thunder Bay Airport, the temperature is a frosty -8.4°C under mostly cloudy skies. The dew point is -13.9°C, humidity sits at 65%, and visibility is excellent at 32 km. A brisk northeast wind at 13 km/h is pushing the wind chill to a crisp -14°C. The barometric pressure is steady at 102.2 kPa and on the rise—meaning that clearer skies are just around the corner.
Cold Winds and Clearing Skies
This morning will start off mainly cloudy with a 40% chance of lingering flurries—likely more of a tease than a squall. That said, conditions are set to clear by mid-morning, giving us a bright but brisk day ahead. Winds will pick up from the north at 30 km/h, gusting up to 50 km/h, which will keep the wind chill biting at -19°C early on and around -8°C this afternoon. The high for the day is -2°C. The UV index is moderate at 3, so even with all this cold, the sun might try to trick your skin into thinking it’s July.
Tonight: Clear, Crisp, and Classic April Chill
Tonight brings only a few clouds and more cold. Winds will ease to light this evening, but the low will drop to a bitter -18°C. Wind chills tonight will feel like -23°C, so tuck those thermals in tight and don’t skimp on the hot cocoa.
A Sunny Week Ahead
Tuesday, April 8, will shine with full sun and a high of -2°C. However, a southeast breeze picking up late in the day will keep the morning wind chill close to -25°C, so it’ll be a teeth-chatterer if you’re heading out early. Tuesday night stays clear and cold with a low of -19°C.
Wednesday finally nudges above freezing with a high of +1°C under sunny skies, and Thursday keeps the good vibes going with a high of 6°C. Spring is on its way—slowly, stubbornly, but surely.
What to Wear
We’re in deep-layer territory here. A down parka, insulated boots, gloves, toque, and scarf are non-negotiables. The wind will cut right through anything light, especially in the morning. Sunglasses are a stylish bonus for the clear skies ahead.
April 7th Weather History in Thunder Bay
Historically, Thunder Bay has seen a high of 15.6°C on this day, and a chilling low of -21.7°C. So today’s -2°C high and -18°C low aren’t too far off from the April 7th norm. It’s cold, but it’s our kind of cold.
Thunder Bay Weather Trivia
Did you know Thunder Bay is one of Canada’s sunniest cities in the winter? With around 305 days of sunshine a year, even when it’s cold, at least it’s bright. We like to think of it as “solar-powered optimism.”
