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Thunder Bay Weather in May
During May, Thunder Bay experiences moderate daytime temperatures of 13°C (55°F) and cooler nights around 4°C (39°F). Expect quite a bit of rainfall. Around 73 mm (2.9 in) is typical.
Rainfall in Thunder Bay in May
Rain is expected on roughly 11 days, totalling around 73 mm (2.9 in) for the month. Rain this month is fairly typical, a standard mix of wet and dry days with no particularly heavy or persistent showers.
Temperature in Thunder Bay in May
If you're visiting Thunder Bay in May, expect highs of 13°C (55°F) and overnight lows around 4°C (39°F). Conditions are often most pleasant around the middle of the day. With lows around 4°C (39°F), nights are cold. The upside is that cool, crisp nights are often the best for a deep sleep.Should you favor a climate that's both dry and comfortably warm, July and August typically offer the most agreeable circumstances. If you're seeking pleasant, dry and sunny weather somewhere else in the world, our weather planner can help you explore other options.
Thunder Bay Temperature in May
Min Temperature
4°C (39°F)
Max Temperature
13°C (55°F)
Chance of Rain
36%
Precipitation
73 mm (2.9 in)
Rainy days
11 days
Thunder Bay Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Thunder Bay - and find the best time to visit.
Best Places in Canada in May
Find out more about the weather in Canada and which places have the best travel conditions in this month. See all of Canada in May →
perfect weather
pleasant
tolerable
unpleasant
poor
Perfect weather is subjective. On this map perfect weather has been defined with temperatures between 20°C (68°F) and 29°C (84°F) and not too much precipitation (less than 90 mm (3.5 in) a month).
What to Wear in Thunder Bay in May
The weather can swing between comfortable and chilly in May, so flexibility is key. Pack a variety of tops, at least one warm layer, and both shorts and long pants. This gives you options no matter what the day brings. Wet weather is likely, so pack waterproof gear for multiple rainy days.
What To Do in Thunder Bay in May
We rated the following activities from 1 (least suitable) to 10 (best) to do.
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Cycling6/10 -
Walking6/10 -
Barbeque4/10 -
Camping4/10 -
Outdoor sports6/10
Thunder Bay 3-Day Forecast
More climate data for Thunder Bay
See the full Thunder Bay climate overview or explore weather in Canada.
Popular in May
Where to go in May - average daytime high across popular destinations.
Niagara Falls
21°C (70°F) Montréal20°C (68°F) Ottawa20°C (68°F) Quebec City19°C (66°F) Calgary17°C (63°F) Vancouver16°C (61°F) Toronto16°C (61°F) Whistler11°C (52°F) Bucket list
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The 5 most beautiful lakes in Canada
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