Snow Arrives This Afternoon, Freezing Drizzle Risk Overnight, Milder Air Builds Monday

Thunder Bay is starting Sunday in the deep cold near -22°C, but a weather shift is underway. Clouds increase this morning and snow develops this afternoon, followed by a steadier snow tonight. The key travel and walking concern comes late tonight into Monday: a risk of freezing drizzle, which can create slick, hard-to-spot ice even when snowfall looks light.

Today’s Weather Overview

Current Conditions (Thunder Bay Airport, 7:00 AM EST)

• Temperature: -22.1°C

• Condition: Mostly cloudy

• Wind: SW 3 km/h

• Wind chill: -25

• Humidity: 81%

• Visibility: 24 km

• Pressure: 102.2 kPa, falling

Sunday Forecast (Today)

• Mainly sunny early, then increasing cloudiness

• Snow begins this afternoon

• Snow amount: about 2 cm today

• Wind: up to 15 km/h

• High: -10°C

• Wind chill: about -24 this morning, improving to -16 this afternoon

Tomorrow’s Forecast

Expected Conditions (Next Three Days)

Tonight (Sunday night)

• Snow, ending overnight, then cloudy with 40% chance of light snow

• Risk of freezing drizzle overnight

• Snow amount: about 5 cm

• Temperature: steady near -10°C

• Wind chill: near -16

Monday, January 5

• Cloudy with 40% chance of light snow

• Risk of freezing drizzle

• High: -4°C

• Wind chill: -14 in the morning, near -8 in the afternoon

• Night: Cloudy, low -8°C

Tuesday, January 6

• Cloudy

• High: -2°C

• Night: Cloudy, low -7°C

Wardrobe Recommendations

• Today (cold, snow later): Warm winter coat, toque, mitts, and insulated boots. Add a scarf/neck warmer for the morning wind chill.

• Tonight/Monday (freezing drizzle risk): Prioritize traction—boots with good tread (or ice cleats if you’ll be walking a lot). Watch steps, parking lots, and sidewalks for glare ice.

• Driving: Keep washer fluid topped up—wet snow and drizzle can quickly coat your windshield.

Weather Trivia

Freezing drizzle forms when tiny cloud droplets stay liquid below 0°C (supercooled). When they hit roads and railings, they freeze instantly—creating a thin glaze that can be hard to see, especially at night.

Last Word on the Weather

Thunder Bay forecast for Sunday, Jan. 4, 2026: snow begins this afternoon with about 2 cm, then steadier snow tonight (about 5 cm) with a risk of freezing drizzle overnight. Light snow and freezing drizzle risk continues Monday as temperatures moderate toward -4°C.