From Clouds to Sunshine: Sioux Lookout Heats Up with 30°C by Tuesday

SIOUX LOOKOUT – WEATHER REPORT – After a cloudy, damp start to the day, Sioux Lookout is about to dive headfirst into a stretch of classic early summer heat. While there’s no official heat warning just yet, the forecast is inching closer to those thresholds—with temperatures expected to hit 30°C by Tuesday, and overnight lows staying warm enough to make your fan work overtime.

Cloudy with a Side of Sizzle: Forecast Through Wednesday

As of 5:06 AM CDT, it’s a cool 7.4°C under mostly cloudy skies at Sioux Lookout Airport. Humidity sits at a moderate 65%, with a dew point of 1.2°C. Winds are coming from the south at 21 km/h, gusting to 35, and the barometric pressure is falling at 101.6 kPa—a signal that change is brewing.

Today, early morning showers are expected to taper off, leaving mainly cloudy skies with a 40 percent chance of more showers through the day. There’s also a risk of a thunderstorm this morning just to keep things interesting. Winds will ease this afternoon after gusting to 40 km/h earlier in the day. The high will climb to 24°C with a UV index of 7—so sun safety still applies, even if clouds linger.

Tonight looks unsettled, with mainly cloudy skies and a 60 percent chance of showers plus another risk of thunderstorms. Winds from the northeast will gust to 20 km/h before calming after midnight, with the low holding steady at 11°C.

Monday will serve up a taste of summer. Expect a mix of sun and cloud, and a 30 percent chance of morning showers. Winds will shift to the south and pick up speed, gusting to 50 km/h by mid-morning. The high is forecast to reach 29°C, with a humidex of 30 making it feel even toastier. The UV index stays at 7, so don’t skimp on sunscreen.

Monday night will be warm and partly cloudy, with a 30 percent chance of showers and a mild low of 17°C.

Tuesday is shaping up to be a true scorcher with sunny skies and a high of 30°C—perfect for early patio season, but also a nudge to hydrate and dress wisely. The night will be clear and cooler with a low of 13°C.

Wednesday brings a mix of sun and cloud and a 30 percent chance of showers. Highs will ease to a still-warm 26°C, with nighttime cloud periods and a 60 percent chance of showers and a low of 11°C.

What to Wear (and What to Avoid)

You’ll want to dress in breathable layers today, especially with the risk of showers. But by Monday and Tuesday, it’s tank-top-and-shorts territory—think loose, light fabrics and wide-brimmed hats if you’re venturing out. And with warm nights ahead, you may want to dust off that fan and check your AC before Tuesday hits.

Historic Highs and Lows for May 11

The record high for this date in Sioux Lookout is a blazing 31.2°C, while the record low is a chilly -3.9°C. Today’s high of 24°C isn’t breaking records, but the week ahead just might flirt with them.

Sioux Lookout Weather Trivia

Sioux Lookout’s location near numerous lakes and rivers means that humidity can build quickly during warm spells—making humidex readings spike even when the air temperature doesn’t seem extreme. That’s why a 29°C day here can feel like 35°C in the right (or wrong!) conditions.