Cool start this morning, milder and breezy by afternoon — frost risk returns by Tuesday night
Thunder Bay begins the new week under mostly cloudy skies, but expect clearing and warming through the day as the sun returns and winds shift. After last night’s strong gusts and showers, today offers a calmer and more seasonable feel. However, another temperature dip is on the way — below-freezing temperatures are expected Tuesday night, with the first widespread frost of the season.
🌤️ Current Conditions (as of 7:00 AM EDT – Thunder Bay Airport)
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Temperature: 9.3°C
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Dew Point: 3.7°C
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Humidity: 68%
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Wind: NW 11 km/h
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Pressure: 101.7 kPa (rising)
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Condition: Mostly Cloudy
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Visibility: 24 km
Monday, October 6 Forecast
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Morning: A mix of sun and cloud with light northwesterly winds
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Afternoon: Winds shift to southwest 20 km/h; skies remain mixed
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High: 16°C
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UV Index: 4 (moderate)
Tonight
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Evening: Clearing skies
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Winds southwest 20 km/h, becoming light overnight
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Low: +4°C
Tuesday, October 7
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A mix of sun and cloud
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Winds: Increasing to northwest 30 km/h, gusting to 50 km/h in the morning
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High: 13°C
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UV Index: 3 (moderate)
Tuesday Night:
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Clear skies
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Low: –5°C
❄️ Widespread frost expected — cover sensitive plants or bring them indoors
Wednesday, October 8
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Sunny and calm
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High: 13°C
Wednesday Night:
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Clear skies
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Low: +2°C
🧥 Wardrobe & Garden Tips
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Today:
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Cool in the morning — light jacket needed
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Milder this afternoon, but wind will add a chill — especially on the lake
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Tuesday:
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Windy and cooler — wear layers and windproof gear
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Prepare for widespread frost Tuesday night
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Gardeners:
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Bring in potted plants and cover tender vegetation Tuesday evening to prevent frost damage
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3-Day Weather Summary
| Day | Conditions | High / Low | Wind Gusts | Notes |
|---|---|---|---|---|
| Mon 6 | Mix sun/cloud | 16°C / +4°C | 40 km/h (PM) | Breezy, dry, mild |
| Tue 7 | Partly cloudy, windy | 13°C / –5°C | 50 km/h (AM) | Turning colder, frost risk |
| Wed 8 | Sunny | 13°C / +2°C | Light | Pleasant and calm fall day |
Weather Trivia
Did you know?
The average first frost in Thunder Bay typically occurs in the first week of October, and with clear skies and calm conditions expected Tuesday night, we’re right on schedule. Lows near –5°C can easily damage annuals, vegetables, and outdoor plants that haven’t yet been protected.
Enjoy the mild sunshine today, and prepare for the season’s first real chill tomorrow night. Stay tuned to the NetNewsLedger Weather Desk for more regional updates.
