A Golden Sunday in Sioux Lookout with a Dash of Weather Whiplash Ahead

A Bright and Balmy Day to Soak Up the Sun

Sioux Lookout is waking up to a picture-perfect spring morning, with clear skies and a gentle temperature of 4.0°C as of 6:00 AM at Sioux Lookout Airport. The wind is currently a soft southeast breeze at 5 km/h, with humidity sitting at 90%, adding a little early-day crispness to the air. Visibility is wide open at 24 kilometres, making for a beautiful morning horizon.

The pressure sits at 101.8 kPa and is rising, indicating a stable stretch of pleasant weather through the day. Sunshine is on the menu, and lots of it, with temperatures soaring to a very spring-like high of 21°C. Winds will pick up from the southeast at 20 km/h by mid-morning, giving the day just enough breeze to keep things fresh. With the UV index hitting 7 — considered high — don’t forget to lather on sunscreen even if the breeze fools you into feeling cool.

Tonight: Calm, Clear and Mild

The clear trend continues tonight with skies staying cloudless. Southeast winds will ease off after midnight, becoming light, and the overnight low will dip to a mild 8°C — ideal for a peaceful evening walk or cracking open a window for some fresh night air.

Monday: Even Warmer Before a Sudden Cool Down

If you thought today was nice, Monday ups the ante. Expect full sunshine and a high of 23°C, with southerly winds becoming gusty at 20 km/h, reaching up to 40 km/h. Perfect weather for barbecues, bike rides, or just finally giving your snow boots the boot.

Monday night remains clear and comfortable, with a low of 9°C. But hold on tight — things are about to change.

Tuesday’s Forecast: The Cool Air Comes Calling

Tuesday offers a mix of sun and cloud with a 30 percent chance of showers and a much cooler high of just 14°C. The real shock comes Tuesday night, when temperatures drop sharply to a low of -3°C. Yes, from 23°C to sub-zero in 36 hours — classic northern Ontario, keeping you on your frost-bitten toes.

Wednesday rebounds nicely with sunshine and a daytime high of 14°C, and clear skies again overnight with a low around 0°C. Not tropical, but tolerable.

What to Wear

Start with light layers this morning, shed them as the warmth builds, and don’t forget sunglasses and SPF. Monday is short-sleeve territory. But don’t put away the warmer layers yet — by Tuesday night, you might be dusting off the toque again.

Sioux Lookout Weather Trivia

On this date, May 4th, Sioux Lookout’s record high was a toasty 27.0°C set in 2001, while the record low plunged to -7.2°C in 1974. With today’s pleasant 21°C and that looming Tuesday night chill, it seems this year’s forecast is combining both ends of the spectrum — just to keep things interesting.