Morning Fog Advisory in Effect
Thunder Bay – Weather – Thunder Bay wakes up today wrapped in a thick blanket of fog, with visibility down to a mere 0.4 km as of 7:00 AM. The temperature sits at 15.1°C, matching the dew point exactly—no wonder the air feels like a damp towel. Humidity is a full 100%, winds are barely stirring from the north at 2 km/h, and barometric pressure sits at 101.1 kPa and falling, hinting at a subtle shift in weather conditions.
Environment Canada’s Fog Advisory remains in effect for the City of Thunder Bay, cautioning travellers about sudden near-zero visibility on the roads. If you’re out driving early, keep those lights on, slow down, and remember—this is not the morning to test your rally racing skills.
The Day Ahead
By late morning, the fog will finally lift, revealing a mix of sun and cloud. Winds will swing to the southwest, picking up to 20 km/h, helping push the mercury up to 27°C, with a humidex making it feel closer to 32°C. The UV index will hit a “high” 7, so sunglasses and sunscreen should be part of your day kit.
Tonight will bring mainly cloudy skies and a calm return to misty conditions as fog patches develop again overnight. Expect a low of 16°C—pleasant enough for an evening stroll if you don’t mind a little haze.
Looking to Monday
Tomorrow starts in a similar fashion—patchy fog in the morning—but skies will clear by late morning. Expect another warm day with a high of 27°C (humidex 32), and the UV index again at 7. Monday night will turn cloudy, with a 40% chance of showers and a mild low of 16°C.
Wardrobe Suggestions
Layer lightly this morning if you’re heading out early; that damp fog will cling to clothing. By midday, it’s shorts-and-T-shirt weather, but keep a light jacket handy for after sunset. And, if you’re biking or walking early, reflective gear will help you be seen in the thick fog.
Weather Trivia
Did you know? Thunder Bay’s fog can be heavily influenced by the cool waters of Lake Superior. On calm, humid mornings, the lake acts like a fog machine—perfect for spooky film sets, less so for morning commutes.
Historic Temperatures for August 10:
Record high: 33.3°C (1948)
Record low: 3.3°C (1940)
