Best time to visit Thunder Bay

Find the best time to visit Thunder Bay and plan your perfect trip in 2024/2025. Get holiday inspiration, weather guides, travel advice and find great deals.

Thunder Bay by month

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When is the best time to visit Thunder Bay?

The best time to visit Thunder Bay is July based on the following average weather conditions.

Maximum daytime temperature = 22 - 30°C [remove]
Daily hours of sunshine = 10 hours or more [remove]

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Max Day Temperature (°C)

  • -9°C maximum daytime temperature in January in Thunder Bay-9
  • -6°C maximum daytime temperature in February in Thunder Bay-6
  • 0°C maximum daytime temperature in March in Thunder Bay0
  • 8°C maximum daytime temperature in April in Thunder Bay8
  • 15°C maximum daytime temperature in May in Thunder Bay15
  • 20°C maximum daytime temperature in June in Thunder Bay20
  • 24°C maximum daytime temperature in July in Thunder Bay24
  • 22°C maximum daytime temperature in August in Thunder Bay22
  • 17°C maximum daytime temperature in September in Thunder Bay17
  • 10°C maximum daytime temperature in October in Thunder Bay10
  • 2°C maximum daytime temperature in November in Thunder Bay2
  • -6°C maximum daytime temperature in December in Thunder Bay-6

Hours of Sunshine (daily)

Best time to visit

The weather guide for Ontario (Thunder Bay) shows long term weather averages processed from data supplied by CRU (University of East Anglia) & today's weather forecast provided by meteoblue. Find out more about our data sources.

Metric (°C / mm)  |  Imperial (°F / inches)

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Which is the hottest month in Thunder Bay?

The hottest time of year in Thunder Bay is normally July. Expect maximum daytime temperatures to reach 24°C.

Which month has the most rain in Thunder Bay?

In terms of rainfall, August is usually the wettest month in Thunder Bay with 88mm on average. There are normally 13 days in August with some rain.

When is it sunniest in Thunder Bay?

The sunniest time of year in Thunder Bay is normally July with bright sunshine on average for 61% of daylight hours; that's 10 hours of sunshine per day.

When is the sea warmest in Thunder Bay?

The sea is usually at its warmest in Thunder Bay in August when the water temperature reaches 13°C.

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