Summer Celebrations with a Side of Thunder

Saturday: A Promising Start with Evening Fireworks from the Sky?

The Canada Day long weekend kicks off in Thunder Bay with a calm and cool morning. As of 7:00 AM, it’s 11.4°C with a sticky 100% humidity and not a breeze in sight — just a light west-southwest wind at 6 km/h. Skies are mostly cloudy for now, but the barometric pressure is rising at 101.5 kPa, suggesting some clearing and sunshine ahead.

Expect the sun to break through this morning, with skies becoming a mix of sun and cloud by the afternoon. Temperatures will rise to a delightful 25°C, with a humidex of 29, so it’ll feel warm — perfect for patio breakfasts and lakeside lounging. The UV index is a blazing 9, so even if clouds linger, sun protection is non-negotiable.

But hang on to your party hats — tonight brings a 70% chance of showers and the risk of a thunderstorm as things turn stormy after sunset. Winds will shift to south at 20 km/h by late morning and ease off by nightfall. Expect a low of 14°C, and some potential thunder boomers to accompany your evening bonfire.

Through July 1st, the Thunder Bay Border Cats are playing a homestand at Port Arthur Stadium, with the Cats in the hunt for first place in the standings. The Border Cats conclude their two-game series against Mankato on Saturday before continuing their homestand with four against the Waterloo Bucks.

It’s the first Season Ticket Redemption Night of the year. Unused season tickets can be used for single-game tickets for Saturday night’s game. On Sunday check out the excitement: MOVIE NIGHT / come early to watch The Sandlot beginning at 2:15pm on the Right Field Video Board.  The movie will also be shown upon the games completion. There will be Fireworks on June 30 2025.

Sunday: Some Sun, Some Storm, and a Sweaty Twist

Sunday, June 29, will bring mainly cloudy skies and a 40% chance of showers, especially in the afternoon, when there’s also a risk of thunderstorms. The high reaches 24°C, and with a humidex of 30, it’ll feel tropical — like a July 1 sneak preview. The UV index remains high at 8, so you’ll still want your SPF if you’re venturing outdoors.

Sunday night continues with cloudy periods and a 40% chance of showers, cooling down to 15°C.

Monday & Tuesday: Canada Day Week Ends on a Milder Note

Monday (June 30) keeps the party going with a mix of sun and cloud and — you guessed it — another 40% chance of showers. Highs will hit 26°C, making it a warm day for lake trips or any lingering long weekend plans. Overnight, the forecast stays consistent with cloudy periods and another 40% chance of showers, and a low of 14°C.

Canada Day Tuesday (July 1) will feature a mix of sun and cloud and still a 40% chance of showers, but the high of 25°C is ideal for parades, barbecues, and community events. Fireworks weather looks promising as the skies turn partly cloudy overnight, with a low of 12°C.

How to Dress: Layers, Light Clothes, and Rain-Ready Footwear

While you’ll definitely want to bring out the shorts and t-shirts during the day, pack a light jacket for the evening, and keep a rain shell and umbrella close by. A few well-timed showers and storms could disrupt plans — especially Saturday and Sunday evenings — so flexibility is the name of the game.

Thunder Bay Weather Trivia

Did you know? Thunder Bay’s summer sunrises are some of the earliest in Ontario — the city often sees daylight before 5:30 AM in late June. That gives you more time to enjoy nature… or to chase down those scattered showers!