Thunder Bay – Weather – Thunder Bay is starting Friday with cool, clear skies this morning. High humidity and light winds have made for perfect visibility and tranquil conditions to begin the day.
Water levels in rivers and creeks across the city remain high from the rain.
However, as the region warms up, humidex levels will climb, and a risk of thunderstorms returns by Saturday afternoon, marking a transition toward unsettled weekend weather.
Today’s Weather Overview
Current Conditions (as of 7:00 AM EDT at Thunder Bay Airport)
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Temperature: 12.9°C
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Wind: West-southwest at 8 km/h
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Humidity: 100%
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Dew Point: 12.9°C
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Pressure: 101.7 kPa (rising)
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Visibility: 24 km
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Sky Conditions: Mainly sunny with calm and humid air
Today, Thunder Bay will enjoy clear skies and abundant sunshine. The high will reach 26°C, and the humidex will climb to 30, making the air feel warmer and more tropical than the actual temperature suggests. The UV index is 8 – very high, so sun protection is highly recommended during peak hours.
Tonight, expect a few clouds, with a comfortably cool low of 12°C.
Tomorrow’s Forecast
Expected Conditions
Saturday, July 26:
A mix of sun and cloud is forecast with a 30% chance of afternoon showers, and a risk of thunderstorms developing by mid to late afternoon. The temperature will peak at 26°C, but with the humidex rising to 33, it will feel hot and sticky. The UV index remains at 8 – very high.
Saturday Night:
Expect cloudy periods with a 60% chance of showers, and a warm overnight low of 18°C.
Sunday, July 27:
A continued mix of sun and cloud with a 40% chance of showers. Temperatures will climb to a high of 28°C, with the potential for late-day thunderstorm activity.
Sunday Night:
Showers are expected, with the overnight low at 16°C.
Monday, July 28:
The start of the new week brings more mixed skies and a 40% chance of showers, with a high near 27°C.
Monday Night:
Cloudy skies continue with another 40% chance of showers, and the temperature drops to 13°C overnight.
Wardrobe Recommendations
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Today: Start with a light jacket this morning, but switch to breathable summer attire by midday. Sunglasses, a hat, and sunscreen are must-haves due to the high UV index.
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Saturday & Sunday: Lightweight, quick-dry clothing is best. Bring a small umbrella or rain jacket for those spotty showers and possible storms.
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Monday: Keep waterproof outerwear handy. Layered clothing will help adjust to the changing mix of sun and clouds.
Weather Trivia
Did You Know?
Thunder Bay’s broad temperature swings between morning lows and afternoon highs are due in part to low humidity overnight and inland geography, which allows for rapid cooling followed by quick warming under sunny skies. That’s why mornings can feel cool—even in the middle of a summer heat trend.
