From Thunderstorms to Sunshine – Expect All the Weather Flavours This Victoria Day Weekend

THUNDER BAY – WEATHER REPORT – Thunder Bay certainly lived up to its electrifying name overnight, with booming thunder and flashes of lightning giving locals an early taste of summer storm season. This morning, the city is cloaked in misty skies and a damp 10.3°C. With humidity maxed out at 100% and a very gentle north breeze at 2 km/h, the air is thick and visibility is reduced to just 6 km at the airport. Pressure is on the rise at 99.5 kPa—but don’t let that fool you into thinking smooth sailing is ahead.

Forecast: Classic Lake Superior Shuffle – Clouds, Chill, and a Hint of Spring Sunshine by Monday

Friday will keep skies grey with a 60 percent chance of showers persisting throughout the day and a risk of a thunderstorm in the afternoon to keep the name “Thunder Bay” in play. Fog patches will lift by midday, but be prepared for brisk winds from the east at 20 km/h, gusting to 40 km/h later in the morning. Temperatures will climb to a respectable 18°C, offering a short reprieve before the chill returns. The UV index will sit at a moderate 4, so keep the umbrella handy but don’t forget your sunscreen either.

Tonight remains mostly cloudy with another 60 percent chance of showers and perhaps one more rumbly thunderstorm early in the evening. Temperatures will settle to a cool 7°C overnight.

Saturday continues the unsettled pattern with cloudy skies and a 40 percent chance of lingering showers. Highs will only reach 11°C, while the night could bring a mix of rain showers or even a few rogue flurries—just to keep us guessing. The low will dip to 2°C.

Sunday brings a stubborn cloud cover with a 30 percent chance of showers through the day. Highs will barely crack 10°C, and Sunday night will be crisp with clearing skies and a frosty low of -1°C.

Victoria Day Monday finally promises a textbook-perfect finish to the weekend, with sunny skies and a high of 10°C. The night will stay clear and milder at 2°C, offering a refreshing end to the unpredictable weekend.

Wardrobe Wisdom: From Raincoats to Toques to Sunglasses

For this long weekend, your suitcase will need to cover the whole weather bingo card—rain gear, layered hoodies, cozy socks for those frosty mornings, and sunglasses for Monday’s long-awaited blue skies. And if you’re camping or hiking near the lake, keep an eye on those sneaky fog patches.

Thunder Bay Weather Trivia

Here’s a nugget to impress your friends around the bonfire—Thunder Bay has seen snowflakes as late as May 28 back in 1961. So if you see a flurry or two this weekend, it’s just Thunder Bay tipping its hat to its unpredictable past.