Midweek Sunshine and Haze in Thunder Bay with Storm Clouds Lurking on the Horizon
Wednesday, June 18, 2025 – Weather Update for Thunder Bay
THUNDER BAY – WEATHER – After a misty, mysterious start to the morning, the skies over Thunder Bay are clearing up to deliver a bright and warm Wednesday. At 6:00 AM EDT, conditions at Thunder Bay Airport reported fog patches, 100% humidity, and a temperature of 11.6°C. Winds are light from the west at 6 km/h, and visibility has rebounded nicely to 32 km, giving the Sleeping Giant a clearer view of the city once again.
Today: Sunshine with a Dash of Haze
Expect a mix of sun and cloud today, with the morning fog and haze quickly dissipating as temperatures climb. The high will reach a very pleasant 26°C, with a humidex of 29—a summery feel without the heavy stickiness. With the UV index hitting 7, that’s your cue to slap on sunscreen and rock the sunglasses if you’re heading outside.
Whether you’re headed to the marina, biking along the trails, or simply enjoying a coffee downtown, this is one of those days when Thunder Bay shines—literally.
Tonight: Slight Chance of Showers Under Partly Cloudy Skies
As the sun dips, the skies become partly cloudy, with a 30% chance of showers this evening. It’s nothing to stress over, but keep an umbrella nearby just in case Mother Nature gets nostalgic for last night’s rainfall encore. The overnight low is a cool 11°C, perfect for cracking the window for some natural A/C.
Thursday: Clouds Move Back with Rain in Tow
Thursday, June 19, brings increasing cloudiness early in the day, and by midday, there’s a 60% chance of showers, with east winds picking up to 20 km/h. The high temperature will fall back to 18°C, making it noticeably cooler. The UV index drops to 3, so sunscreen can take a back seat for the day.
Looking Ahead: A Wet Pattern Persists
Friday stays cloudy with a high of 19°C, and a 40% chance of showers creeps in overnight. Saturday, however, offers some balance with a mix of sun and cloud and a high of 22°C. Not quite beach weather, but ideal for a hike or a lakeside outing—just keep a rain jacket handy.
Wardrobe Wisdom
Morning layers are a must today, especially with the fog lingering early. Transition into light, breathable clothing by late morning to stay comfortable. A wide-brimmed hat and UV protection are your best friends if you’re out during peak sun hours.
Thunder Bay Weather Trivia
Did you know? Thunder Bay holds the Canadian record for the most consecutive hours of sunshine in winter—97 straight hours! While today won’t be quite that extreme, this lakeside city sure knows how to bounce between fog and flare with impressive flair.
