Thunder Bay Weather in August

In Thunder Bay, August brings high daytime temperatures around 23°C (73°F), with nights cooling to 14°C (57°F). Expect quite a bit of rainfall this month.

Rainfall in Thunder Bay in August

Typically, about 13 days will experience rainfall, with an average of 72 mm (2.8 in) for the month. The rainfall pattern this month is fairly balanced. Showers tend to be moderate rather than extreme.

Temperature in Thunder Bay in August

The perfect temperature in Thunder Bay in August makes it a solid month to visit, with 23°C (73°F) during the day and 14°C (57°F) at night. This month falls in the summer season. Overall, the month follows a fairly predictable daily temperature pattern. Nights drop to around 14°C (57°F), which is noticeably cooler than the daytime. A light jacket for the evening is a sensible addition, and the cool nights tend to make sleeping comfortable. On average, it sees the highest temps of the year.

If you're inclined towards comfortable temperatures and drier conditions, August is a good time to visit Thunder Bay.

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For a detailed overview over the year and the best time to visit Canada, check out our Thunder Bay's climate page.

Thunder Bay Temperature in August

Min Temperature 14°C (57°F)  

Max Temperature 23°C (73°F)  

Chance of Rain 42%  

Precipitation 72 mm (2.8 in)  

Rainy days 13 days  

What to Wear in Thunder Bay in August

Pleasant temperatures in August mean you can pack light but flexibel pieces. Think cotton t-shirts, comfortable walking shorts, and one warmer layer for evenings. A light sweater or denim jacket works well. Rain gear is recommended, you can expect wet weather on multiple days.

What To Do in Thunder Bay in August

We rated the following activities from 1 (least suitable) to 10 (best) to do.

Cycling

9/10

Walking

9/10

Camping

8/10

Outdoor sports

9/10

Select a Month

Check the conditions for any month of the year.

• January
• February
• March
• April

• May
• June
• July
• August

• September
• October
• November
• December

For a detailed overview over the year and the best time to visit Canada, check out our Thunder Bay's climate page.

More climate data for Thunder Bay

Temperature Rainfall

See the full Thunder Bay climate overview or explore weather in Canada.