Celebrating Under the Sun… With a Chance of Thunder

Thunder Bay is waking up to a picturesque start this Canada Day with clear blue skies and a mild 14.3°C at the Thunder Bay Airport. It’s a tranquil morning, perfect for flag-raising ceremonies or coffee on the porch.

With 100% humidity, the air is thick with summer, and pressure is rising at 101.0 kPa, indicating an active weather day ahead. Winds are calm from the west at 8 km/h, but they’ll pick up later.

Between Fort William Historical Park, Prince Arthur’s Lands, the Thunder Bay Border Cats game at Port Arthur Stadium, lounging at the lake, or just enjoying the day, Happy Canada Day.

Canada Day Forecast – Classic Summer Heat with a Dash of Drama

The day will heat up quickly under the sun, reaching a high of 28°C by the afternoon. But thanks to that lovely summer humidity, it will feel more like 33°C with the humidex. Expect a mix of sun and cloud by midday, and a 60% chance of showers by afternoon, with the risk of a thunderstorm tagging along.

Winds will swing in from the west at 20 km/h, offering some relief, but also possibly helping build up those afternoon storm clouds. If you’re planning outdoor festivities or fireworks setup, keep one eye on the sky — and maybe keep a tarp nearby.

Tonight & Beyond – Clearing Skies After Storm Chances

Tonight, the storm risk lingers into the evening with a 60% chance of showers and thunderstorms, but skies will clear late, bringing a mild low of 14°C — not too cold for post-fireworks stargazing.

Looking Ahead:

• Wednesday, July 2: A sunny start with a chance of afternoon showers (30%). High of 26°C, humidex 29.

• Thursday, July 3: Classic summer sunshine returns. High 26°C.

• Friday, July 4: A mix of sun and cloud and a slight rain risk. High 25°C.

What to Wear on Canada Day

Start the day with a light jacket for the early breeze, but shed it by mid-morning. Lightweight, breathable clothes are a must today. Red and white gear will pair perfectly with a reusable water bottle and sunscreen (UV index 8 – that’s very high).

Thunder Bay Weather Trivia

Did you know? Thunder Bay holds the record for Ontario’s highest Canada Day temperature at a sizzling 36.7°C, set in 1921. Thankfully, this year isn’t quite that toasty, but it’s a fine day to celebrate under a summer sun.