Thunder Bay weather

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Recommended for Ontario

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.

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  • Thunder Bay climate averages by month
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Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

When is the best time to go to Thunder Bay?

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

Maximum daytime temperature = 72 - 86°F [remove]
Daily hours of sunshine = 10 hours or more [remove]

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Max Day Temperature (°F)

  • 16°F maximum daytime temperature in January in Thunder Bay16
  • 21°F maximum daytime temperature in February in Thunder Bay21
  • 32°F maximum daytime temperature in March in Thunder Bay32
  • 46°F maximum daytime temperature in April in Thunder Bay46
  • 59°F maximum daytime temperature in May in Thunder Bay59
  • 68°F maximum daytime temperature in June in Thunder Bay68
  • 75°F maximum daytime temperature in July in Thunder Bay75
  • 72°F maximum daytime temperature in August in Thunder Bay72
  • 63°F maximum daytime temperature in September in Thunder Bay63
  • 50°F maximum daytime temperature in October in Thunder Bay50
  • 36°F maximum daytime temperature in November in Thunder Bay36
  • 21°F maximum daytime temperature in December in Thunder Bay21

Hours of Sunshine (daily)

Best time to go for the weather

Metric (°C)  |  Imperial (°F)

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More about Canada

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 75°F.

Which month has the most rain in Thunder Bay?

In terms of rainfall, August is usually the wettest month in Thunder Bay with 3.5 inches 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 55°F.

What is the flight time to Ontario from the UK?

The flight time to Ontario from the UK is typically 8 hours.

What is the time difference between Ontario and the UK?

The time difference between Ontario and the UK is GMT-5 to GMT-6 hours.

What is the main language spoken in Ontario?

The main languages spoken in Ontario are English and French.

Learn a language for Ontario with Busuu*, Lingoda* and Mondly*.

What is the currency in Ontario?

The currency in Ontario is the Canadian Dollar (CAD).

Send money to Ontario with XE Money Transfers*.

Which plugs are used in Ontario?

Ontario uses electrical plug type A + B (120 Volts).

Which side of the road do they drive on in Ontario?

They drive on the right side of the road in Ontario.

Do you need a visa for Ontario?

Yes, UK passport holders do need a visa to enter Ontario.

Check Canada visa requirements for all passport holders with VisaHQ* and*.

Compare Thunder Bay weather with the USA

Below the Thunder Bay weather chart shows average maximum daytime temperature for Thunder Bay, Ontario, Canada and the USA (Washington).

Maximum daytime temperature (°F)

Thunder Bay, Ontario, Canada
USA (Washington)

Metric (°C)  |  Imperial (°F)

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