Brisk Morning at Just 2°C, But a Bright and Beautiful Week Lies Ahead
From Fog and Frost to Sun and Heat—Spring Weather Swings in True Superior Style
THUNDER BAY – WEATHER – Monday, May 26, 2025 – It’s a cold start in Thunder Bay this morning, with the icy breath of Lake Superior making its presence known. Temperatures dipped to just 2.2°C at dawn, a stark reminder that spring along the lakeshore is never in a rush. But not to worry—sunshine and steadily warming days are lining up for the rest of the week.
As of 6:00 AM EDT, conditions at Thunder Bay Airport were mainly clear, with a matching dew point and humidity of 100%, a sure sign of foggy patches lingering early. Winds are light from the west at 8 km/h, and visibility is strong at 24 km. Barometric pressure is at 102.9 kPa and rising, pointing to a beautiful and stable day ahead.
Today, once the fog patches lift, expect sunny skies and a high of 21°C inland. However, areas near Lake Superior will once again feel the cooling influence of the big lake, with daytime highs closer to 16°C. The UV index is 7, so even with cooler air, sun protection is a must.
Tonight will be clear with an overnight low of +5°C, making it another cool but comfortable night.
Looking Ahead: Steady Warm-Up and Full-On Sunshine
The rest of the week delivers a perfect weather portfolio:
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Tuesday: A mix of sun and cloud with a high of 21°C (16°C near the lake), low of 6°C
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Wednesday: A touch warmer, 24°C under partly sunny skies, low of 9°C
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Thursday: The warmest day yet—sunny and 29°C across the region, with a clear night and low of 9°C
This is prime Thunder Bay weather—bright, dry, and steadily warming, with only the lake breeze holding back shoreline temperatures.
Wardrobe Suggestion
This morning calls for a toque or at least a fleece jacket—it’s genuinely chilly. But by afternoon, it’s light layers and sunglasses. If you’re near the lake, toss an extra layer in your bag; that Superior breeze doesn’t mess around.
Weather Trivia: Lake Superior’s Cool Control
Did you know? Lake Superior’s water temperature in late May is often below 5°C, which makes it a powerful natural air conditioner. That’s why shoreline communities in Thunder Bay can feel 5 to 10 degrees cooler than areas just a few kilometres inland!
