Sunday Starts Misty, But Expect Sunshine and Sizzle Later in Thunder Bay
THUNDER BAY – WEATHER – If you’re peeking out your window this morning and seeing a ghostly haze, you’re not imagining things. Thunder Bay woke up wrapped in fog patches this Sunday morning, but hang tight—it won’t last. With the sun ready to take over, it’s shaping up to be a classic late-summer mix: a touch mysterious to start, with some possible thunder theatrics before the curtain drops tonight.
At 8:00 AM EDT, the temperature at Thunder Bay Airport was 10.7°C under foggy conditions. The barometric pressure is at a solid 102.3 kPa and rising, a sign that the weather’s in a bit of a balancing act today. Humidity is at a muggy 100%—yes, it feels like the air is giving you a moist handshake—and the wind is whispering in from the west at just 5 km/h. Visibility is impressively clear at 24 km, once you get above the low-lying fog.
Historically speaking, Thunder Bay has seen extremes on this day: the record high for August 31 was a toasty 30.3°C back in 1983, while the chilliest dip on record came in at a brisk 1.3°C in 1965. Today’s forecast splits the difference rather nicely.
H2: A Teeter-Totter Sky: Sun, Showers, and Thunderstorms Possible
As the morning fog patches lift, Thunder Bay will enjoy a mix of sun and cloud through the day. By late afternoon, however, a 40 percent chance of showers rolls in, with a side order of possible thunderstorms. Don’t be too surprised if the skies get a little dramatic.
The high will reach 23°C, but thanks to the humidity, it’ll feel closer to 27°C with the humidex. Sunscreen isn’t optional either—the UV index is rated at 6, or “high,” so don’t skip the SPF even if clouds are loitering.
Wardrobe tip? Lightweight layers will do the trick today. Bring along a light rain jacket or umbrella just in case the skies put on a show this afternoon. Footwear: waterproof is wise, but don’t go full rubber boots unless you like to commit to a mood.
Tonight, the skies ease up a bit with partial cloud cover and a continued 40% chance of early evening showers. Thunderstorm risks remain, but fade with the daylight. Fog patches will likely redevelop overnight as the temperature dips to a mild 14°C.
H3: A Look Ahead: September Begins on a Shifty Note
Labour Day Monday (September 1) sees more of the same from Mother Nature’s weather sampler platter. A mix of sun and cloud dominates the day, with a 30 percent chance of showers and risk of thunder later in the afternoon. Fog patches may make a return appearance in the morning but will dissipate as temperatures climb to 24°C, again feeling like 27°C with the humidity.
Monday night cools to 13°C under partly cloudy skies, a calm end to the long weekend.
Tuesday brings a more solid cloud cover with a high of 19°C. Tuesday night is shaping up wetter, with a 60 percent chance of showers and a low of 8°C. A good night to cozy up with a book, not a barbecue.
Weather Trivia: Did You Know?
Thunder Bay’s name comes from the large thunderous sound of waves that crash against the bay during stormy weather—fitting, right? But despite the name, it actually sees fewer thunderstorms annually than many southern Ontario cities. Still, when they roll in, the skies over Lake Superior know how to put on a show.
