Thunder Bay weather and climate in 2026
Day
22 °C
Night
9 °C
Sea
4 °C
Precipitation
79 mm
in month
Rainy days
12 days
in month
Daylight
16 hours
average
Sunshine
9 hours
average
Humidity
72 %
Day
22 °C
Night
9 °C
Sea
4 °C
Precipitation
79 mm
in month
Rainy days
12 days
in month
Daylight
16 hours
average
Sunshine
9 hours
average
Humidity
72 %
Overview: Thunder Bay
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Weather overview for Thunder Bay
Weather overview
Thunder Bay (Canada) in general has a cold continental climate. The day temperatures range from -7 °C (19 °F) in January to 25 °C (76 °F) in July. The least rainy month in Thunder Bay is February with its 5 days of rain, the rainiest month is June, when it rains 12 days. The highest night temperatures could be experienced in July with 11 °C (52 °F), the lowest in January with -20 °C (-4 °F).
January weather
The rainfall amount continues to descent, the value of this measure is 29 mm (1.16 in) in Thunder Bay. The minimum of the night temperature is observable, the value of this measure is -20 °C (-4 °F), and the minimum of the day temperature is observable as well in this month. The number of sun hours (without clouds) rise's start could be observed in January.
February weather
The day temperature rise's start could be observed, its value is -5 °C (23 °F) in Thunder Bay, and the night temperature starts to rise too. The minimum of the number of rainy days is observable, its value is 5 days, and the rainfall amount reaches its minimum too, with its value being 24 mm (0.94 in). The dry season is about to start. The number of sun hours (without clouds) rises similarly to the previous month, with its value of 5 hours.
March weather
The beginning of the rise of the number of rainy days could be noticed, the value of this measure is 6 days in Thunder Bay, and the rainfall amount rise's start could be observed too in this month. The day temperature rises similarly to the previous month, with its value being 2 °C (35 °F), and the night temperature continues to rise too, its value is -11 °C (12 °F). The dry season is close to its peak. The number of sun hours (without clouds) continues to rise, with its value being 5 hours.
Deciding on where to go for a holiday is hard sometimes. Get inspired by the most popular destinations.April weather
The rise of the day temperature can be observed, the value of this measure is 9 °C (48 °F) in Thunder Bay, and the rise of the night temperature can be observed as well, with its value being -3 °C (26 °F). The rainfall amount rises similarly to the previous month, with its value being 46 mm (1.81 in), and the number of rainy days continues to rise too, its value is 8 days. The humidity is on its minimum in April. The number of sun hours (without clouds) rises similarly to the previous month, its value is 7 hours.
May weather
The day temperature continues to rise, its value is 17 °C (62 °F) in Thunder Bay, and the night temperature continues to rise as well, with its value of 3 °C (38 °F). The number of rainy days continues to rise, its value is 10 days, and the rise of the rainfall amount can be observed as well, with its value of 66 mm (2.60 in). The number of sun hours (without clouds) rises similarly to the previous month, with its value being 8 hours.
June weather
The tourist season is at its beginning in Thunder Bay. The maximum of the number of rainy days can be noticed, with its value of 12 days, while the rainfall amount continues to rise, with its value being 79 mm (3.10 in). The day temperature rises similarly to the previous month, with its value of 22 °C (72 °F), and the night temperature rises similarly to the previous month as well, with its value of 9 °C (48 °F). The day length reaches its maximum in June.
July weather
The day temperature reaches its maximum, with its value being 25 °C (76 °F) in Thunder Bay, and the maximum of the night temperature is observable too in July. The beginning of the descent of the number of rainy days could be noticed, its value is 11 days, while the maximum of the rainfall amount is observable, with its value of 81 mm (3.21 in). The ongoing tourist season is noticeable. The maximum of the number of sun hours (without clouds) is observable in this month.
We aggregate data from combining multiple weather sources to ensure accuracy of the highest order.August weather
The beginning of the descent of the day temperature could be noticed, the value of this measure is 24 °C (75 °F) in Thunder Bay, and the beginning of the descent of the night temperature could be noticed too, the value of this measure is 11 °C (51 °F). There is pending tourist season. The rainfall amount starts to descent, while the number of rainy days descents similarly to the previous month. The number of sun hours (without clouds) starts to descent.
September weather
The number of rainy days starts to rise in Thunder Bay. The day temperature continues to descent, its value is 19 °C (66 °F), and the night temperature descents similarly to the previous month too, its value is 7 °C (44 °F). The descent of the number of sun hours (without clouds) can be observed, with its value being 5 hours. The maximum of the humidity is observable, its value is 79 %.
October weather
The beginning of the descent of the number of rainy days could be noticed in this month in Thunder Bay. The day temperature continues to descent, with its value being 11 °C (52 °F), and the descent of the night temperature can be observed as well. The number of sun hours (without clouds) descents similarly to the previous month.
November weather
The descent of the number of rainy days can be observed, with its value being 8 days in Thunder Bay, while the rainfall amount starts to descent, with its value of 49 mm (1.93 in). The day temperature continues to descent, with its value being 3 °C (37 °F), and the descent of the night temperature can be observed as well, with its value being -6 °C (21 °F). The maximum of the wind speed can be noticed in this month. The minimum of the number of sun hours (without clouds) is observable, the value of this measure is 3 hours.
December weather
The rainfall amount descents similarly to the previous month in Thunder Bay. The descent of the night temperature can be observed, its value is -15 °C (5 °F), and the day temperature continues to descent as well, its value is -5 °C (23 °F). The minimum of the day length can be noticed, the value of this measure is 8 hours.
FAQs
How windy is it in Thunder Bay in February?
An average wind scale that can be expected in February in Thunder Bay is 5.
What is the night temperature in March in Thunder Bay?
The average night temperature in Thunder Bay in March is -11 °C (12 °F). The nights will be cool, layers of clothes will be needed for evening and morning walks, the hotel should be equipped with heating. This indicator is higher by 7 °C (45 °F) than in the previous month.
Is there a dry season in Thunder Bay in April?
No, April is not a dry month in Thunder Bay, expect rain approximately 8 days in a month.
How many sunny hours can I expect in May in Thunder Bay?
In Thunder Bay in May, you can expect around 8 hours of sunshine.
Deciding on where to go for a holiday is hard sometimes. Get inspired by the most popular destinations.How many days of precipitation on average can I expect in Thunder Bay in June?
In June in Thunder Bay, we can expect 12 days to be rainy, that is, days when precipitation exceeds 2 mm (0.08 in). Converted to days of the week, this means that it will occur on an average of 2.7 days of the week, or in general - 38 % days.
What temperature can I expect during the day in July in Thunder Bay?
The average daily temperature in Thunder Bay in July is 25 °C (76 °F). A comfortable temperature for most people, where it is neither too cold nor too hot, and a large number of activities can be carried out comfortably, including sunbathing by the water. This indicator is higher by 3 °C (37 °F) than in the previous month. Lighter clothing will be suitable - shorts, skirts, t-shirts, jackets; a light sweater and long trousers may also be useful.
Is there a wet season in Thunder Bay in August?
No, there is no wet season in August in Thunder Bay - you can expect 10 days of rain during the month.
Are there good conditions to visit in September in Thunder Bay?
Thunder Bay can be visited in September - the weather will be moderate. The temperature of 7 °C (44 °F) at night may make it better to dine inside or to put on more clothes for a dinner outside.
We make the most from 40 years of historical weather data to predict the best weather conditions.
Deciding on where to go for a holiday is hard sometimes. Get inspired by the most popular destinations.
We aggregate data from combining multiple weather sources to ensure accuracy of the highest order.