Thunder Bay – Weather – It’s a crisp, almost fall-like morning in Thunder Bay as we kick off the final week of August. After a weekend of cooler weather the week ahead holds in store more seasonal weather.
With the temperature dipping just above 7°C early this morning and humidity near 92%, the air feels fresh and slightly damp—ideal for early risers or morning walkers.
But don’t be fooled by the cool start: sunny skies and gusty northwest winds are setting the stage for a pleasant and breezy day ahead.
Today’s Weather Overview
Current Conditions
As of 8:00 AM EDT, Thunder Bay is experiencing partly cloudy skies with a temperature of 7.4°C, observed at Thunder Bay Airport. The dew point sits at 6.2°C, pushing humidity up to a sticky 92%, which is typical for a clear, cool morning.
Winds are currently west-southwest at 8 km/h, but will shift to the northwest and pick up significantly, reaching 30 km/h with gusts up to 50 km/h by late morning. This breeze will bring a noticeable wind chill early on but will help dry out the air later in the day. The barometric pressure is at 101.7 kPa and rising, suggesting fair weather will persist.
Expect a high of 20°C, under mainly sunny skies. The UV index is 6, classified as high, so sun protection is recommended during peak hours.
Tonight, skies will remain clear, and winds will ease to light after gusting earlier in the day. The temperature will fall to a chilly 6°C, so those heading out overnight should dress accordingly.
Forecast into the Week
Expected Conditions
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Tuesday, August 26: Another sunny and pleasant day is on tap for Thunder Bay, with a high of 22°C. Winds will be lighter, and conditions will remain dry. UV index stays at 6.
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Overnight: Clear skies will dominate again, with a low of 9°C.
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Wednesday, August 27: A slight change in pattern arrives midweek. Expect a mix of sun and cloud with a 60% chance of showers, especially in the afternoon. Daytime high remains 22°C.
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Night: Cloudy periods continue with a 40% chance of showers, and a low of 11°C.
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Thursday, August 28: Showers clear out, making way for sunny skies once again. High near 20°C, and clear overnight with a low of 9°C.
Wardrobe Recommendations
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Today: Layer up this morning with a light jacket or sweater—especially if you’re heading out before 10 AM. By midday, short sleeves and light pants will be comfortable, but hold onto your windbreaker due to gusty conditions.
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Tuesday: Sunglasses and sunscreen are a must. Dress in breathable clothing as it will be warm and sunny.
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Wednesday: Prepare for possible rain—carry an umbrella or a raincoat just in case.
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Thursday: Comfortable and sunny again; light layers will do the trick.
Weather Trivia
Did you know? Thunder Bay once recorded its coldest August temperature on August 29, 1978, when the mercury dipped to -0.5°C. While we’re nowhere near that chilly this year, today’s cool morning is a reminder that the seasons are subtly beginning to shift.
