Weather in Thunder Bay in August
Thunder Bay, Canada averages a high of 22.3°C (72.1°F) and low of 15.4°C (59.7°F) in August, with 9 rain days and 11.5 hours of daily sunshine. Travel score: 81.9/100 (Excellent). The best time to visit Thunder Bay is August.
High
22°C72°F
Low
15°C60°F
🌧️
9
rain days
☀️
11.5
hrs/day sunshine
💧
75%
humidity
82— Excellent
August in Thunder Bay is warm and occasionally wet — ideal for sightseeing and outdoor activities.
What are the average temperatures in Thunder Bay?
How much does it rain in Thunder Bay in August?
Thunder Bay receives an average of 64mm of rainfall across 9 rainy days in August. The annual total is 654.6mm.
What should I pack for Thunder Bay in August?
Essentials
👟
Comfortable walking shoes
Essential for exploring the city
👕
Light layers and t-shirts
Warm weather around 22°C
🧴
Sunscreen SPF 30+
12 hours of sunshine daily
🕶️
Sunglasses
Protect your eyes from bright sun
Recommended
🧥
Light rain jacket
Some rainy days expected (9 days)
☔
Umbrella
Be prepared for occasional showers
🎉Visiting Canada in August?
Don't miss any public holidays — check before you book!
Compare Thunder Bay
Popular comparisons:
How can I plan my trip to Thunder Bay?
What are other popular cities in Canada?
What is the weather like in other months in Thunder Bay?
Data based on 1994–2024 averages · Last updated: 2024-12-31