🌧️ Grab the raincoat and maybe the rubber boots — Thunder Bay is in for another wet and breezy day as a fall storm system continues to move through Northern Ontario
Current Conditions – 7:00 AM EDT (Thunder Bay Airport)
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Temperature: 8.4°C
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Condition: Light Rain
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Pressure: 99.6 kPa (Falling)
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Humidity: 100%
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Wind: NNE 5 km/h
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Visibility: 13 km
THUNDER BAY – WEATHER – A damp, grey morning greets the Lakehead today as light rain continues under overcast skies. Conditions will worsen slightly through the day as the wind strengthens and steady rain develops across the city and surrounding region.
Thunder Bay is stuck under a damp pattern to start the week, with periods of rain continuing through Wednesday. Cooler air arrives by midweek, bringing the risk of flurries and overnight frost as skies clear Thursday night. The weekend looks calmer and slightly warmer, though mostly cloudy.
🧭 Quick Forecast Recap
| Date | Forecast | High | Low | Notes |
|---|---|---|---|---|
| Tue 21 Oct | Rain, windy | 9°C | +4°C | Gusts to 50 km/h |
| Wed 22 Oct | Rain, cooler | 7°C | +1°C | Chance of flurries overnight |
| Thu 23 Oct | Cloudy, cool | 6°C | -4°C | Clearing late |
| Fri 24 Oct | Partly sunny | 7°C | 0°C | Dry |
Today – Tuesday, October 21
Expect periods of rain throughout the day, with winds picking up from the northeast at 30 km/h gusting to 50 km/h by late morning. Temperatures will hold steady near 9°C.
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Rainfall: 5–10 mm
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UV Index: 1 (Low)
By afternoon, expect cooler and breezier conditions as the low pressure system pushes moisture northward.
Tonight
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Weather: Periods of rain continue this evening before easing overnight.
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Wind: North 20 km/h becoming light later this evening.
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Low: +4°C
The steady rain tapers off late, but clouds linger overnight with some patchy fog possible by morning.
Wednesday, October 22
Another unsettled day ahead.
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Weather: Periods of rain with a northwest wind near 20 km/h by afternoon.
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High: 7°C
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UV Index: 2 (Low)
By evening, the system begins to exit, allowing cooler air to filter in behind it.
Wednesday Night
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Weather: Cloudy with a 30% chance of rain showers or flurries as temperatures hover near the freezing mark.
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Low: +1°C
Thursday, October 23
A much cooler day across Thunder Bay as early winter hints begin to show up.
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Weather: Cloudy with a 30% chance of light showers or flurries.
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High: 6°C
Expect clearing skies by evening as colder, drier air settles over Northwestern Ontario.
Thursday Night
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Weather: Clear and chilly.
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Low: -4°C
Frost is likely overnight in outlying areas.
Friday, October 24
A brighter finish to the workweek.
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Weather: Increasing cloudiness after a sunny start.
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High: 7°C
Friday Night
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Weather: Cloudy periods.
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Low: 0°C
🌦️ Summary
Thunder Bay is stuck in a damp pattern, with periods of rain continuing through Wednesday. Cooler air arrives by midweek, bringing the risk of flurries and overnight frost as skies clear Thursday night.
The weekend looks calmer and slightly warmer, though mostly cloudy.
🧣 Local Impact Notes
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Expect slippery roads and reduced visibility today and Wednesday. Leaves on the road can make stopping harder.
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Cooler mornings later this week may bring the season’s first frost inland.
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Travellers heading north should prepare for possible light snow mixing in by midweek.
