THUNDER BAY – WEATHER – The weather shift once September started is stark. However, at least it didn’t snow yesterday like it did in Marten Falls and other northern communities.

Today, Thunder Bay is waking up to a mostly cloudy and brisk Thursday morning as cooler air continues to settle over northwestern Ontario. With autumn-like conditions beginning to make a more regular appearance, the next few days bring a mix of clouds, sun, and scattered showers—typical for early September.

Keep a light jacket handy and brace for gusty winds as the day progresses.

Today’s Weather Overview

Current Conditions

As of 8:00 AM EDT, the weather observed at Thunder Bay Airport is:

• Temperature: 4.8°C

• Feels Like: 5°C

• Condition: Mostly Cloudy

• Wind: From the west at 16 km/h (expected to increase)

• Pressure: 100.3 kPa and falling, indicating a possible shift in weather patterns

• Humidity: 86%, making it feel damp and cool

• Dew Point: 2.7°C

• Visibility: A clear 32 km

As the day continues, skies will remain cloudy with a 40% chance of showers. Winds will increase to 30 km/h from the west, gusting up to 50 km/h, making it feel cooler than the forecasted high of 13°C. The UV index will reach 4 (moderate), so some sun protection is advisable during brighter periods.

Extended Forecast

Expected Conditions (September 5–7)

Friday, September 5

• Day: A mix of sun and cloud with a 40% chance of showers. Winds from the west at 30 km/h, gusting to 50 km/h again.

• High: 12°C

• UV Index: 5 (Moderate)

• Night: Cloudy periods continue with a 40% chance of showers.

• Low: 5°C

Saturday, September 6

• Day: A similar pattern persists with a 30% chance of showers and a mix of sun and cloud.

• High: 15°C

• Night: Cloudy periods and another 30% chance of showers.

• Low: 2°C

Sunday, September 7

• Day: Sunny skies return—finally a dry day to enjoy!

• High: 16°C

• Night: Cloudy periods.

• Low: 6°C

Wardrobe Recommendations

As fall begins to show its presence, here’s how to dress for comfort and protection:

• Today: Layer up with a light waterproof jacket, and don’t forget a windbreaker if you’re outside—gusts could catch you off guard. A hat and closed shoes will also keep you comfortable.

• Friday to Saturday: Continue to dress in layers—mornings and evenings will be cool, and there’s always a chance of showers.

• Sunday: With sunshine expected, a long-sleeve shirt or light sweater should be enough for the day, though you’ll still want a jacket for the evening chill.

Weather Trivia

Did You Know?
Thunder Bay once experienced an unusually early snowfall on September 5, 1962, with flurries reported in the city—one of the earliest on record. While this year’s cool start to September won’t bring snow, it’s a reminder of how quickly weather can change in Northwestern Ontario!