A Chilly Morning Leads to a Warm Spring High
Thunder Bay is starting the day on a sunny note, though it comes with a crisp chill in the air. As of 8:00 a.m. at the Thunder Bay Airport, the temperature hovers at 3.7°C with a dew point of 1.8°C. Humidity is sitting high at 87%, giving the morning air a damp bite—but with clear skies and the promise of warming temperatures, it won’t stay brisk for long. Visibility is excellent at 32 km, and the barometric pressure is currently 101.6 kPa and falling, which hints at some instability approaching later today.
Winds are calm this morning out of the west at just 7 km/h, but they’ll gain strength later in the day. By late afternoon, winds will shift to the north at 20 km/h with gusts up to 40 km/h. Today’s high is expected to soar to a delightful 22°C—a warm spring day that might fool a few into thinking summer has arrived early. However, a mix of sun and cloud is expected this afternoon with a 30 percent chance of showers, so don’t let that sunshine lull you into forgetting an umbrella. The UV index will climb to 7, so sunscreen is a must if you’re soaking up the warmth.
Partly Cloudy Tonight, Then a Cool Shift
This evening brings partly cloudy skies and that same 30 percent chance of showers lingering into the early hours. Winds from the northeast will pick up to 20 km/h, gusting to 40, before settling down later in the night. The overnight low will drop to a cool 3°C under clearing skies.
Midweek Dip Before Sunshine Returns
Wednesday, May 7, brings mostly cloudy skies in the morning, but don’t despair—sunshine will return in the afternoon. Temperatures, however, take a noticeable dip, with a high of just 12°C. The UV index remains high at 6, proving that even cool days can bring powerful rays. Wednesday night turns clear but cold, with the temperature plunging to -2°C. Time to tuck in your plants and dig out the cozy socks once more.
Thursday sees a rebound with full sunshine and a high of 16°C, followed by a clear and mild night at 2°C. Friday will feel almost summerlike again with sunny skies and a high of 20°C, although there’s a 40 percent chance of showers developing Friday night as clouds return and the temperature settles at 8°C.
What to Wear?
It’s all about layers today—start with something warm for the morning chill, then be ready to transition to lighter clothes by midday. A jacket that can handle gusty winds (and maybe a sprinkle of rain) will come in handy. And don’t forget your sunglasses and sunscreen—today’s UV index means even spring sunshine packs a punch.
Thunder Bay Weather Trivia
Did you know that Thunder Bay hit a record high of 27.2°C on May 6 back in 1955? Meanwhile, the chilliest May 6 came in 1967 when temperatures dipped to a wintry -6.1°C. So today’s forecast is quite the pleasant middle ground—Mother Nature giving us the best of both worlds.
