Thunder Bay Weather Outlook – Tuesday, November 4 to Thursday, November 6, 2025
THUNDER BAY – WEATHER – The day begins on a crisp note, with Thunder Bay claiming Ontario’s cold spot early this morning. At 6:00 AM EST, the Thunder Bay Airport reported mainly clear skies and –4.0°C, feeling like –8 with the light breeze. The barometric pressure is 101.7 kPa and rising, a sign of fair weather to start, while humidity sits at 86% with a dew point of –6.0°C. A WSW wind near 11 km/h is barely stirring the last of the fallen leaves, and visibility is 24 km—crisp, clean November air.
As the sun climbs, expect a classic shoulder-season swing: mainly sunny skies through the morning with increasing cloudiness near noon. Winds shift to west 20 km/h, easing to light early this afternoon, and temperatures rebound nicely to a high near 10°C. It still bites early on, with a morning wind chill around –7, but the afternoon will feel pleasantly cool.
Tonight – Clouding Over, Rain Late, Mixing with Snow Overnight
Clouds hold the upper hand tonight. Periods of rain begin late this evening, and as cooler air noses in, rain mixes with wet snow overnight. The low settles near +1°C—borderline for slushy coatings on grassy surfaces and deck rails, while most roads stay simply wet.
Wednesday – Breezy, Mostly Cloudy, and a Flurry/Showers Tease
Wednesday leans mainly cloudy with a 30% chance of rain showers or flurries late in the afternoon. Behind the passing disturbance, winds turn northwest 30 km/h gusting to 50, adding a raw edge to a high of +5°C. Skies clear at night, and temperatures dip to around 0°C, setting up patchy frost by dawn Thursday.
Thursday – Brighter Spells, Then Another Evening Chance
Thursday offers a mix of sun and cloud with a 30% chance of spotty showers and a high near +5°C. By night, cloud thickens again with a 60% chance of flurries or rain showers as temps hover around 0°C—a classic November on-again, off-again pattern.
What to Wear
Lean into smart layers: start with a warm base, add a fleece or sweater, and top it with a wind-resistant shell for the afternoon breeze. A toque and gloves make the frosty morning much kinder. Waterproof shoes with decent tread are sensible tonight into Wednesday in case of slushy patches. Keep a compact umbrella or light rain shell handy after sunset.
Historic High & Low for November 4
Exact record values for Thunder Bay on November 4 aren’t included in the data at hand. Typically, early November ranges from single-digit highs with sub-zero nights, while occasional warm surges can push the daytime into the low teens. We’ll add precise records when available.
Lakehead Weather Trivia
Lake Superior is a master illusionist in November: bright, breezy mornings can flip to cloud and mixed precipitation by night as moist air rides over cooler ground. That’s why you can scrape frost at dawn and dodge raindrops at bedtime—same day, different season.
From the NetNewsLedger Weather Desk, sponsored by Impact Promotions — need ideas to build your brand? Start at impactpromos.ca.
