Thunder Bay weather averages

Going to Thunder Bay? Find the best month to visit Thunder Bay based on the weather.

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Check Thunder Bay weather averages before you book your next holiday in 2019/2020. Today's maximum temperature in Thunder Bay is expected to be 11°C, while the average maximum temperature in May is 15°C.

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More about Thunder Bay

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The weather for Thunder Bay, Ontario 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)

Thunder Bay weather averages: best month

Thunder Bay Best month Averages
Warmest July 24°C
Sunniest July 10 hours per day
Least rain February & April 9 days
Warmest sea August & September 13°C

Thunder Bay climate guide

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Thunder Bay weather averages by month

Check Thunder Bay holiday weather averages for a particular month by selecting from the list below. Monthly weather guides include figures for temperature, rainfall, sunshine hours and sea temperature plus daily sunrise & sunset times.

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Compare Thunder Bay weather with the USA

Below the Thunder Bay weather chart shows maximum daytime temperature for Thunder Bay, Ontario, Canada and the USA (Washington). For more weather parameters or to change the destinations shown visit the comparison weather tool.

Maximum daytime temperature (°C)

Thunder Bay, Ontario, Canada
USA (Washington)
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Metric (°C / mm)  |  Imperial (°F / inches)

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Popular Ontario destinations

Below are average maximum temperatures at popular destinations in Ontario in May. Select a destination to see the weather overview and compare average conditions with today's forecast.

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