From Chilly Mornings to a Sudden Temperature Spike – Then Back to Flurries!

Thunder Bay starts cold at -7°C but warms to 5°C by morning before a sharp drop Friday. Flurries and colder temps return for the weekend. Stay prepared!

Thunder Bay is starting the morning mainly clear and cold, with a current temperature of -7.1°C. The humidity is at 55%, and a west-northwest wind at 10 km/h makes it feel like -12°C outside. Visibility is excellent at 24 km, and the barometric pressure is at 101.3 kPa and rising, suggesting stable conditions—for now.

Today: Cold Start, but Warming Up Later

It’s a frosty morning with a wind chill of -18°C, so dress warmly before heading out. Expect plenty of sunshine early, with clouds gradually moving in this evening. The high will reach 5°C overnight as warmer air moves in from the southwest. The UV index is 3, so sunglasses might be useful.

Tonight: Clouds and Flurries Moving In

Clouds will increase early this evening, bringing a 40% chance of flurries late at night. The wind will pick up from the southwest at 20 km/h, gusting to 40 km/h, before becoming light late in the evening. The low will be +2°C, but temperatures will rise to 5°C by morning—a brief break from the cold!

Friday: A Weather Whiplash Day

Friday starts off cloudy, with flurries or rain showers in the morning before shifting back to flurries in the afternoon. The wind will shift from the southwest to the northwest at 20 km/h, gusting to 40 km/h, and the temperature will plummet from +5°C in the morning to -6°C by the afternoon. With the wind chill, it will feel more like -9°C by the end of the day. The UV index is low at 1, meaning sunshine won’t offer much warmth.

Weekend Outlook: Cold, But Some Sun

• Saturday will be sunny, with a high of -3°C, followed by increasing cloudiness at night and a low of -11°C.
• Sunday turns cloudy, with a 30% chance of flurries and a high of -2°C. The night will bring periods of snow and a low of -7°C.

What to Wear?

This morning calls for winter gear—heavy coats, gloves, and a hat—as the wind chill is a bitter -18°C. By tonight, lighter layers may be needed as temperatures rise. However, with flurries and a sharp temperature drop returning on Friday, keep the warm gear handy!

Thunder Bay Weather Trivia

On this day in 1996, Thunder Bay saw a record-breaking -30.6°C, proving that March can still pack a winter punch! While today’s cold isn’t nearly as extreme, the wild temperature swings remind us that spring in Northern Ontario is anything but predictable.