Sioux Lookout Weather Forecast – Clear Skies, Warming Days, and a Near-Perfect Weekend
A Brisk Morning with Big Spring Energy on the Way
Sioux Lookout, ON – Saturday, May 24, 2025: The morning starts off cool and mostly cloudy, but the forecast promises plenty of sunshine and seasonal warmth to make up for it. As of 5:00 AM at Sioux Lookout Airport, the temperature is just 4.0°C with 94% humidity and a light north breeze at 2 km/h — barely enough to ruffle your hoodie. Pressure is at 102.5 kPa and rising, a clear signal that stable, sunny conditions are building in for the weekend. Visibility is excellent at 24 km, setting the stage for a beautiful day.
Expect clouds to break early this morning, turning into a mix of sun and cloud, and by this afternoon, it’ll be fully sunny with a high of 15 to 18°C depending on how quickly the sun takes over. The UV index is 6, which is high, so lather on some sunscreen if you’re planning to spend the day outside.
A Chilly Night With a Frost Warning Nudge
Tonight, skies stay mostly clear, and temperatures will dip to a cool +3 to +4°C. There’s a risk of patchy frost in some rural or low-lying areas — so gardeners, keep a sheet or cover nearby just in case. That said, it’s a quiet and calm night ahead, great for stargazing or enjoying an evening fire.
Sunday and Monday: Glorious Sunshine and Warmer Temps
Sunday kicks the weekend into high gear with sunny skies and a high of 19 to 20°C. The UV index stays at 6, so sun protection is again a must for outdoor plans. Sunday night brings cloudy periods, but it will be comfortably mild with a low around 6 to 7°C.
Monday delivers full-on spring perfection with sunshine and a high of 22°C, perfect for everything from fishing to finally tackling the backyard cleanup. The night will remain clear and mild with a low of +7°C.
What to Wear?
Layer up this morning — it’s brisk. A warm hoodie or jacket will be welcome early on, but by midday, a light shirt and sunglasses will do the trick. Make sure to apply sunscreen — the sun may feel gentle, but the UV levels are strong. For nighttime, toss on something warm if you’re outdoors, and cover sensitive plants just in case frost pays a late visit.
Historic Temperatures for May 24
Sioux Lookout has experienced a record high of 28.6°C and a record low of -2.2°C on this day. Today’s mid-teen high and near-frost low fall comfortably in the spring sweet spot, though a few folks may still wake up to frost-kissed windshields.
Sioux Lookout Weather Trivia
Did you know Sioux Lookout gets over 2,300 hours of sunshine a year? That’s more than Vancouver, Montreal, or even Toronto — and it’s clear that the town is living up to its sunny reputation this weekend. So go ahead, make those outdoor plans and enjoy the lake views!