Sioux Lookout Weather Forecast – Warm, Breezy, and a Bit Unpredictable
A Bright and Pleasant Morning
Sioux Lookout, ON – Tuesday, May 27, 2025: The day is off to a beautiful start in Sioux Lookout with mainly sunny skies and a comfortable temperature of 10.2°C at 6:00 AM, recorded at Sioux Lookout Airport. The humidity sits at 71%, with a dew point of 5.2°C, which makes the air feel fresh but not muggy. Winds are light from the south-southeast at 8 km/h, and visibility is a clear 24 km. The barometric pressure is at 102.6 kPa, though it’s falling, a sign of some potential unsettled weather heading our way this afternoon.
Warm Sunshine Early, Showers and Storm Risk Later
The good news is that this morning and early afternoon will stay sunny and warm, with temperatures climbing to a pleasant high of 23–24°C. The breeze from the south will help nudge those temperatures upward, and it’s a perfect time to get out for a hike or some time by the water. The UV index will climb to 6, so make sure to apply sunscreen if you’re spending any time outdoors.
However, by mid to late afternoon, clouds are expected to increase, bringing a 30% chance of showers and a risk of thunderstorms. It’s the kind of day where an umbrella should be in your bag — even if you don’t need it until late in the day.
Mild and Clear Night Ahead
Tonight, any early evening showers or storms should clear quickly, leading to partly cloudy skies overnight. The low will settle around 10°C, making for a calm and comfortable evening perfect for relaxing outside or cracking the window open while you sleep.
Looking Ahead: Warm and Sunny Through the Week
The rest of the week looks to continue the warm trend. Wednesday will bring a mix of sun and cloud, another 30% chance of showers in the afternoon, and a high near 24°C. Wednesday night clears out nicely with a low around 11°C.
Thursday and Friday will feel more like early summer with sunny skies, highs of 26°C Thursday and around 22°C Friday, and clear, mild nights in the low double digits. Perfect weather to soak in the spring warmth before June rolls in.
What to Wear?
You’ll want light layers this morning — maybe a hoodie or light jacket — but short sleeves and sunglasses will be the go-to by lunchtime. Don’t forget the sunscreen with that high UV index. And if you’re out in the afternoon or evening, have a rain jacket or umbrella close by, just in case those pop-up showers or rumbles of thunder decide to make an appearance.
Historic Temperatures for May 27
Historically, Sioux Lookout has seen a record high of 28.7°C and a record low of -1.5°C on this date. Today’s high of 23–24°C lands comfortably in the “spring bliss” range — warm enough for summer vibes, without breaking a sweat.
Sioux Lookout Weather Trivia
Did you know that Sioux Lookout is often called the “Hub of the North” due to its central role in transportation and healthcare in Northwestern Ontario? It also tends to get a great balance of sun and rain in spring, which is why it’s a haven for fishing, hiking, and — yes — mosquito breeding. So while you’re enjoying the sunshine, maybe keep that bug spray handy too.
