Thunder Bay Weekend Weather Outlook for October 25-27 2025

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Good morning, Thunder Bay and Lake Superior mariners!

THUNDER BAY – WEATHER – From the NetNewsLedger Weather Desk, here’s your Thunder Bay weekend weather and marine forecast for Saturday, October 25th through Monday, October 27th.

We’re waking up to a cool start this morning at zero degrees in Thunder Bay under mostly cloudy skies. Winds are light from the north-northwest near 3 kilometres an hour, and there’s a bit of chill in the air — a wind chill around minus one.

For today, expect cloudy conditions early, but skies will clear by midday. Winds remain gentle, up to 15 kilometres an hour, with a high near 10 degrees.
Tonight, under clear skies, temperatures drop to plus three — a calm, quiet evening across the region.

Sunday continues the fair-weather pattern — mainly sunny and slightly warmer, reaching 12 degrees. Monday stays sunny as well, with highs near 12 again — a steady, pleasant stretch for late October.

Now for the Lake Superior West Marine Forecast:
Conditions are excellent for small craft and recreational boaters this weekend.

  • Today: Light winds, mostly northwest at 5 to 10 knots, waves half a metre or less.

  • Tonight: Winds becoming light and variable, calm waters overnight.

  • Sunday: Light southerlies around 10 knots, waves under 1 metre.

  • Monday: Winds increasing slightly from the southwest, 10 to 15 knots, with waves building to 1 metre by evening.

No marine warnings or advisories are in effect for western Lake Superior.

🎙️ In summary: A mild, dry, and calm weekend across Thunder Bay and Lake Superior. Perfect weather for a fall drive, a lakeside walk, or one last outing on the water before the season ends.

That’s your Thunder Bay and Lake Superior West Weather and Marine Update, from the NetNewsLedger Weather Desk, powered by Environment Canada — keeping you informed across Northwestern Ontario’s skies and waters.

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