Grab your gloves and a warm coat — Thunder Bay wakes up to a frosty fall morning

Thunder Bay – Weather – It’s a crisp and chilly start across Thunder Bay, with temperatures just above freezing and wind chills dipping below. Partly cloudy skies and a northwest breeze add to the brisk feel this morning, but we’ll see a gradual warm-up this afternoon with some sun breaking through.

A hard freeze is expected again tonight, with wind chills near –7°C overnight.

Milder, sunnier conditions are on the way later this week.

🌤 Current Conditions (as of 6:00 AM EDT – Thunder Bay Airport)

• Temperature: 1.8°C

• Dew Point: –0.4°C

• Humidity: 85%

• Wind: NW at 7 km/h

• Wind Chill: Feels like –1 to –2°C

• Pressure: 101.6 kPa (falling)

• Sky: Partly Cloudy

• Visibility: 24 km

📅 Tuesday, October 7 Forecast

• Morning: A mix of sun and cloud; cold start with wind chills near –5°C

• Winds: Becoming northwest 30 km/h, gusting to 50 km/h

• Afternoon High: 12°C

• UV Index: 3 (moderate)

🌙 Tonight – Frost Alert

• Skies: A few clouds

• Winds: NW 20 km/h gusting to 40 early, becoming light overnight

• Low: –4°C

• Wind Chill: Near –7 overnight

• ❄️ Widespread frost and hard freeze expected — protect plants and plumbing

🌞 Wednesday, October 8

• Skies: Sunny

• Winds: Light, up to 15 km/h

• Morning Wind Chill: –8°C

• High: 13°C

• UV Index: 3 (moderate)

Wednesday Night:

• Clear skies

• Low: +3°C

🌤️ Thursday, October 9

• Skies: Sunny

• High: 18°C

Thursday Night:

• Cloudy periods, 40% chance of showers

• Low: 9°C

🌦️ Friday, October 10

• Clearing skies, becoming mostly sunny

• High: 18°C

• Night: Cloudy periods

• Low: +4°C

🧣 What to Wear

• Today:

  • Gloves, hat, and a layered jacket this morning

  • Lighter layers possible by mid-afternoon

• Tonight:

  • Bundle up! Freezing overnight temperatures and wind chills may feel wintry

🌾 Garden & Outdoor Tips

• Protect or harvest sensitive plants before nightfall — tonight’s low of –4°C will result in widespread ground frost.

• Bring pets and potted plants indoors

• Outdoor taps and hoses should be disconnected or insulated if unprotected

3-Day Summary

🧊 Weather Trivia

Did you know?
Thunder Bay’s average first frost occurs in late September to early October. This morning’s chill is right on schedule, and tonight’s –4°C low is cold enough to damage even hardy fall crops and unprotected perennials.

Stay warm this morning and prep for frost tonight. Warmer days are just around the corner. – NetNewsLedger Weather Desk