Thunder Bay Weather Outlook – Wednesday, October 15, 2025

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Royalton Hotel on Bay Street in Thunder Bay
Royalton Hotel on Bay Street in Thunder Bay

🌥️ A calm midweek pattern with brief morning cloud and fog — showers return Thursday and Friday before a mild weekend

Thunder Bay wakes up to overcast skies and light winds this Wednesday morning, with temperatures around +6°C. A few early morning showers are possible, but skies are expected to clear by afternoon, bringing a pleasant and seasonably mild day with highs near 15°C. Fog will likely form again overnight before a more unsettled stretch begins on Thursday as another Pacific moisture system moves into northwestern Ontario.

🌤 Current Conditions (as of 7:00 AM EDT – Thunder Bay Airport)

  • Temperature: 5.6°C

  • Dew Point: 3.5°C

  • Humidity: 86%

  • Wind: SW 5 km/h

  • Pressure: 102.9 kPa (falling)

  • Condition: Cloudy

  • Visibility: 24 km

📅 Wednesday, October 15 Forecast

  • Weather: Cloudy with a 30% chance of showers early this morning, clearing this afternoon.

  • Wind: Light from the southwest.

  • High: 15°C

  • UV Index: 3 (moderate)

🌙 Tonight

  • Weather: A few clouds with fog patches developing after midnight.

  • Low: +2°C


🌧️ Thursday, October 16

  • Weather: Increasing cloudiness with showers beginning in the afternoon.

  • Fog patches dissipating in the morning.

  • Wind: Southeast 20 km/h late in the morning.

  • High: 14°C

  • UV Index: 3 (moderate)

Thursday Night:

  • Cloudy with a 70% chance of showers.

  • Low: +9°C


🌦 Friday, October 17

  • Weather: Cloudy with a 60% chance of showers.

  • High: 19°C

Friday Night:

  • Cloudy with a 40% chance of showers.

  • Low: +10°C


🌤 Saturday, October 18

  • Weather: A mix of sun and cloud with a 30% chance of showers.

  • High: 16°C

Saturday Night:

  • Cloudy.

  • Low: +3°C


🌬 Weather Highlights

  • Today: Early morning cloud and light drizzle possible; sunny breaks by afternoon.

  • Tonight: Fog formation possible in low-lying and rural areas.

  • Thursday–Friday: A mild but wet pattern returns, with gusty southeast winds and on-and-off showers.


🍂 4-Day Summary

Day Conditions High / Low Rain Chance Wind
Wed 15 Cloudy, clearing PM 15°C / +2°C 30% AM Light SW
Thu 16 Cloudy, PM showers 14°C / +9°C 70% PM SE 20 km/h
Fri 17 Cloudy, scattered showers 19°C / +10°C 60% Light SW
Sat 18 Mix of sun and cloud 16°C / +3°C 30% Light

🧣 Wardrobe & Safety Tips

  • Today: Light jacket or sweater — mild by afternoon.

  • Tonight: Expect fog and cooler lows, especially inland.

  • Thursday: Keep an umbrella and raincoat handy; afternoon rain likely.

After a calm and mild Wednesday in Thunder Bay, fog and showers return Thursday — followed by a warm, breezy end to the week. – NetNewsLedger Weather Desk

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