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Thunder Bay Weather in September
Thunder Bay in September sees pleasant daytime temperatures of 18°C (64°F) and nighttime lows of 10°C (50°F). With the highest rainfall of the year it is wise to pack an umbrella and expect frequent showers.
Rainfall in Thunder Bay in September
With this being the rainiest month, having an umbrella is essential to avoid unexpected rain. Looking at the last 30 years, the data shows about 13 days with rain, averaging 93 mm (3.7 in) for the month. Rainfall intensity is on the higher side this month. Expect more substantial showers rather than light, passing rain.
Temperature in Thunder Bay in September
Daytime highs in Thunder Bay in September reach 18°C (64°F), with nights around 10°C (50°F). September is part of summer. Conditions are often most pleasant around the middle of the day. At 10°C (50°F) overnight, it can feel quite a bit cooler after dark. Worth packing something warmer for evenings, but the cooler temperatures are ideal for sleeping.Our weather planner can help you find worldwide destinations with pleasant weather during this period. July and August typically offer the best weather for Thunder Bay.
Thunder Bay Temperature in September
Min Temperature
10°C (50°F)
Max Temperature
18°C (64°F)
Chance of Rain
43%
Precipitation
93 mm (3.7 in)
Rainy days
13 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 September
Find out more about the weather in Canada and which places have the best travel conditions in this month. See all of Canada in September →
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 September
Comfortable temperatures call for an easy wardrobe in September. Pack summer basics like t-shirts and shorts, but include a light jacket for cooler moments. A pair of comfortable walking shoes is essential. Expect heavy rainfall, so bring good rain protection and waterproof bags.
What To Do in Thunder Bay in September
We rated the following activities from 1 (least suitable) to 10 (best) to do.
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Cycling9/10 -
Walking9/10 -
Camping8/10 -
Outdoor sports9/10
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 September
Where to go in September - average daytime high across popular destinations.
Toronto
22°C (72°F) Niagara Falls23°C (73°F) Montréal
22°C (72°F) Ottawa22°C (72°F) Quebec City
20°C (68°F) Vancouver19°C (66°F) Calgary19°C (66°F) Whistler15°C (59°F) Bucket list
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