Thunder Bay – Weather – The summer roller coaster continues. The city is waking up this morning to clear skys after a few days of wet weather.

Today those mainly sunny skies start with a brisk 10°C at 7:00 AM EDT, as observed at the Thunder Bay Airport.

With light southwest winds at 9 km/h and 93% humidity, it’s a cool and refreshing start. Visibility is excellent at 32 km, and atmospheric pressure is falling at 101.8 kPa, signalling a slight shift in conditions.

📅 Today’s Weather Overview

☀️ Thursday Forecast

• Morning: Mainly sunny and cool.

• Afternoon: Clouds will increase near noon, and winds will shift northwest at 20 km/h, becoming lighter by late afternoon.

• High: 22°C

• UV Index: 7 (High) – Be sure to wear sunscreen if outdoors.

🌙 Tonight’s Forecast

• Skies will be mostly clear with just a few clouds overhead.

• Low: 10°C

• No precipitation is expected overnight.

Extended Forecast

Friday, July 18

• A mix of sun and cloud to start the day.

• Clouds will thicken in the afternoon with a 40% chance of showers developing into the evening.

• High: 22°C with a humidex of 25

• UV Index: 7 (High)

• Low Friday Night: 13°C

Saturday, July 19

• A partly cloudy day with a 40% chance of showers continuing.

• High: 23°C

• Night: Clear skies return, low of 10°C

Sunday, July 20

• A full return to sunny weather.

• High: 24°C

• Night: Increasing cloudiness with a mild low of 11°C

👕 Wardrobe Tips

• Morning: Light jacket or sweater recommended.

• Afternoon: Short sleeves will do, but keep a light layer on hand with breezy winds expected.

• Evening: A light coat will help with dropping temperatures under clear skies.

🧠 Weather Trivia

Did you know? Thunder Bay’s unique position by Lake Superior often causes localized microclimates — it can be sunny in town while nearby hills or bays are blanketed in mist!