Weekend Forecast: Cloudy with a Side of Sun and a Sprinkle of Showers
THUNDER BAY – WEATHER REPORT – Autumn’s arrival is making itself known in Thunder Bay this Saturday morning, as temperatures start off on the crisp side at just 4°C under mostly cloudy skies. Observations from the Thunder Bay Airport at 7:00 AM EDT show a sleepy sky and a cool breeze hinting at changes in the air—both on the weather front and your wardrobe.
The wind is currently blowing west-southwest at 13 km/h but will shift to a more determined westward push, picking up to 20 km/h and gusting to 40 km/h later this morning. The barometric pressure is on the rise at 101.1 kPa, and humidity is hanging heavy at 92%, creating that dewy morning chill that clings to your windshield and your soul. Visibility is decent at 24 km, so driving conditions remain smooth.
The forecast for today is mainly cloudy with a 30 percent chance of showers this afternoon, just enough to make you double-think that walk without a jacket. Temperatures will climb to a modest high of 15°C, with a UV index of 4—moderate enough for some sunscreen if the clouds decide to part briefly.
Tonight: Keep the Blankets Handy
As the sun sets (somewhere behind the clouds), Thunder Bay will remain mostly cloudy with a lingering 30 percent chance of early evening showers. Winds will ease off, shifting to the northwest at 20 km/h before going calm tonight. Expect a low of +4°C—cool, but nothing your favorite fuzzy socks can’t handle.
Sunday and Monday: A Sunny Surprise and a Warm Finish
Now here’s the good news: Sunday’s forecast is looking bright—literally! Expect mainly sunny skies and a high of 17°C, the kind of September day that practically begs for a hike, a paddle, or at least a good patio coffee. The UV index bumps up to 5, so don’t pack away that sunscreen just yet.
Sunday night will be clear and calm, with a low of +3°C—perfect for stargazing if you’re bundled up.
By Monday, increasing cloudiness will usher in a warmer high of 19°C. It’s the kind of weather that gives you one last gentle taste of summer before fall fully takes the stage. The night will stay cloudy with a comfortable low of 12°C.
Wardrobe Wisdom
Start your weekend layering like a seasoned Northerner: think thermal tee under a cozy hoodie with a waterproof shell. Hats and gloves are optional—but not entirely dramatic at 4°C. Sunday’s sunshine will call for lighter layers, while Monday might even tease out the short sleeves again.
Historic Temperatures: Where We’ve Been
On this day in Thunder Bay history, the warmest September 6 recorded a balmy 29.8°C in 1978. The chilliest? A nippy -0.6°C in 1995. This morning’s 4°C is definitely leaning toward the frosty end of that scale.
Weather Trivia: Thunder Bay’s Windy Past
Here’s a gusty nugget: Thunder Bay once recorded wind speeds over 130 km/h during a freak storm in 1977—enough to rearrange patio furniture from here to Duluth! Today’s gusts are tame in comparison, so enjoy that breeze (just maybe tie down your recycling bin).
