Thunder Bay is starting Friday under cloudy skies and just above freezing, with the city moving into a more spring-like stretch after this week’s snow. There are no active weather alerts for Thunder Bay this morning, but the forecast still carries a little leftover winter, including a 30 percent chance of flurries early today before conditions improve.
By NetNewsLedger Weather Desk
Today’s Weather Overview
At 10:00 AM EDT Friday, April 10, Thunder Bay Airport reported cloudy conditions, a temperature of 0.4°C, pressure at 102.5 kPa and rising, humidity at 69 percent, southwest wind at 4 km/h, and visibility at 32 km. It is a quieter and less harsh start than earlier this week, but still cool enough to keep a winter edge in the air.
Environment Canada says today will stay mainly cloudy, with a 30 percent chance of flurries early this morning. Winds will become west at 20 km/h, gusting to 40, and the high is expected to reach 6°C. Tonight, skies begin to clear and the temperature drops to -5°C, with an overnight wind chill near -8.
The Weekend and Beyond
Saturday looks like the pick of the weekend, with sunny skies and a high of 6°C. Saturday night turns a bit less settled, with a 40 percent chance of rain showers or flurries and a low of 1°C. Sunday then shifts wetter, with cloudy skies and a 60 percent chance of rain and a high of 9°C, followed by periods of rain Sunday night and a low of 3°C.
The pattern stays changeable into early next week. Environment Canada’s current forecast calls for a high of 7°C on Monday with a 40 percent chance of showers, then a return to colder overnight conditions with -3°C Monday night and a mix of flurries or rain showers still in the picture into midweek.
Pothole Watch Across the City
This forecast is also a warning sign for drivers. With daytime temperatures above freezing, some nights dropping back below zero, and rain or showers in the mix, Thunder Bay is heading into the kind of freeze-thaw pattern that helps create more potholes.
The City of Thunder Bay says potholes form when moisture seeps into pavement, freezes, expands, and then thaws, weakening the road surface. In a March 2026 city update, Thunder Bay said late winter and early spring typically bring increased pothole activity because of melting snow, rainfall, and ongoing temperature fluctuations.
So while the weather is gradually trending toward spring, drivers should expect road conditions around the city to stay rough in places.
This is the kind of stretch where new potholes can appear quickly, especially after wet periods followed by overnight refreezing. That is a reasonable inference from the city’s explanation of pothole formation and the current Thunder Bay forecast.
Wardrobe Recommendations
A medium-weight jacket is enough for many people this afternoon, but the morning and evening still call for layers. Tonight’s drop back to -5°C means winter outerwear is still a good idea after sunset, and waterproof footwear will be useful through the wetter part of the weekend.
Weather Trivia
Thunder Bay’s spring season often comes in waves rather than one steady warm-up. Lake Superior and lingering cold air can keep the city bouncing between flurries, rain, and freezing nights even while daytime highs climb above seasonal norms. This is an inference based on the current forecast pattern and Thunder Bay’s normal temperatures listed by Environment Canada.
Overview
Thunder Bay weather update for April 10, 2026: mainly cloudy today with a chance of flurries, sunshine Saturday, rain Sunday, and freeze-thaw swings that could lead to more potholes.
