Warmer Weather Continues – Thunder Bay Weather Outlook – Saturday, October 18, 2025

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Sun getting set to rise over Lake Superior and the Sleeping Giant on October 18 2025
Sun getting set to rise over Lake Superior and the Sleeping Giant on October 18 2025

🌥️ Mild air lingers across the north shore — warm, breezy, and partly cloudy heading into a mixed weekend pattern

THUNDER BAY – WEATHER – It’s a pleasantly mild mid-October morning in Thunder Bay, with mostly cloudy skies and light westerly winds keeping temperatures near +11°C. The city is experiencing one of its last mild stretches before a cooler front moves in Sunday.

This morning’s weather image of the Sleeping Giant taken on Red River Road over a very still Lake Superior was taken with an iPhone.

Today will see mainly cloudy skies with sunny breaks, light winds shifting westerly near noon, and an unseasonably warm high near 17°C — several degrees above normal for this time of year.

Current Conditions (as of 8:00 AM EDT – Thunder Bay Airport)

  • Temperature: 10.8°C

  • Dew Point: 8.2°C

  • Humidity: 84%

  • Wind: WSW 12 km/h

  • Pressure: 99.9 kPa (rising)

  • Visibility: 32 km

  • Condition: Mostly Cloudy

Saturday, October 18 Forecast

  • Weather: Mainly cloudy with occasional sunny breaks.

  • Wind: Becoming west 20 km/h near noon.

  • High: 17°C

  • UV Index: 2 (low)

Tonight

  • Weather: Partly cloudy and mild.

  • Wind: West 20 km/h becoming light late this evening.

  • Low: +6°C

🌤 Sunday, October 19

  • Weather: A mix of sun and cloud early, becoming cloudy near noon.

  • Wind: Northwest 30 km/h gusting to 50 in the morning.

  • High: 13°C

  • UV Index: 2 (low)

Sunday Night:

  • Weather: Clear.

  • Low: +1°C

🌧 Monday, October 20

  • Weather: Cloudy with a 30% chance of showers.

  • High: 12°C

Monday Night:

  • Weather: Showers developing overnight.

  • Low: +3°C

🌬 Weather Highlights

  • Today: Mild and breezy with a comfortable fall feel — great for outdoor plans.

  • Sunday: Cooler air pushes in with gusty northwest winds and a noticeable temperature dip.

  • Monday: Showers likely return as another weak system crosses Lake Superior.

🌡 4-Day Summary

Day Conditions High / Low Rain Chance Wind
Sat 18 Mainly cloudy, mild 17°C / 6°C 10% W 20 km/h
Sun 19 Mix of sun and cloud, breezy 13°C / 1°C 20% PM NW 30–50 km/h
Mon 20 Cloudy, scattered showers 12°C / 3°C 30–60% SW 20 km/h
Tue 21 Cloudy, cooler 9°C / 0°C 20% Light NW

🍂 Travel & Lifestyle Notes

  • Fall warmth: Afternoon highs in the mid-teens continue, ideal for outdoor chores or a fall hike.

  • Winds: Gusts increase Sunday morning — secure loose outdoor items.

  • Early week outlook: A cooler, wetter trend returns Monday with light showers expected.

Thunder Bay enjoys another mild October day before cooler, breezier weather arrives Sunday — showers return to start the new week. – NetNewsLedger Weather Desk

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