THUNDER BAY – WEATHER DESK – Sioux Lookout is in a hard mid-winter pattern today: light snow, falling pressure, and strengthening northwest winds.

The biggest headline is the Yellow Cold Warning for Sioux Lookout–Eastern Lac Seul, with wind chills near -40 expected tonight into Monday morning. That level of cold can cause frostbite in minutes on exposed skin.

Please remember if it is cold to you, it is just as cold for your dog or cat. It is also hard on livestock. Remember too, put mittens on your kittens!

Today’s Weather Overview

Current Conditions (Sioux Lookout Airport — 10:00 AM CST)

• Temperature: -19.0°C

• Condition: Light snow

• Wind: S 9 km/h

• Wind Chill: -26

• Pressure: 101.2 kPa (falling)

• Humidity: 76%

• Visibility: 5 km

Light snow is cutting visibility at times, and the falling pressure suggests the cold, unsettled weather isn’t finished yet.

Today (Sunday, Jan 18)

• Periods of light snow ending late this afternoon, then cloudy

• Snow amount: about 2 cm

• Wind becomes NW 20 km/h gusting to 40 early this afternoon

• High: -18°C

• Wind chill: near -29

• Risk of frostbite

Extended Weather Forecast

Yellow Warning — Cold

What: Wind chill values near -40
When: Tonight into Monday morning (very cold wind chills may return for some locations Monday night)
Impact: Moderate — extreme cold puts everyone at risk, with higher risk for those outdoors for extended periods.

Tonight (Sun, Jan 18)

• Mainly cloudy

• Wind NW 20 km/h gusting to 40

• Low: -28°C

• Wind chill: -40 overnight

• Frostbite in minutes on exposed skin

Monday (Jan 19)

• Mix of sun and cloud, 30% chance of flurries in the afternoon

• Wind W 20 km/h gusting to 40

• High: -22°C

• Wind chill: -41 in the morning, -33 in the afternoon

• Frostbite in minutes remains a concern

Monday Night

• Cloudy

• Low: -27°C

Wardrobe Recommendations

• Today: Dress for a wind chill near -29—parka, insulated mitts, toque, and a neck warmer.

• Tonight & Monday morning: Treat it like extreme cold. Cover all exposed skin (face/neck protection is important). Limit time outside and take warming breaks.

• Footwear: Insulated boots with room for thick socks (tight footwear can make feet colder).

• If travelling: Keep extra gloves, a warm layer, and a blanket in the vehicle.

Weather Trivia

Wind chill doesn’t change the air temperature—it changes how fast your body loses heat. Even moderate winds can push “cold” into “dangerous” very quickly, which is why -40 wind chill needs serious respect.

Weather Overview

Sioux Lookout weather forecast for January 18, 2026: Light snow today (about 2 cm) with winds shifting northwest gusting to 40 km/h. Yellow Cold Warning in effect as wind chills near -40 arrive tonight into Monday morning, with frostbite risk in minutes.