What’s the climate like in Thunder Bay?
The current climate of Thunder Bay features average monthly temperatures ranging from highs of 25°C during the day to lows of -7°C. The average yearly temperature is around 10°C. At night, temperatures in the colder months average around -19°C and in the warmer months around 12°C.
The highest temperature recorded in Thunder Bay in recent years was 33°C in July 2021. The lowest daytime temperature recorded was -26°C in January 2014.
On average, Thunder Bay gets 868 mm of precipitation each year. Of this, about 148 cm is snowfall. For comparison, London gets 701 mm of precipitation each year.
Curious about the climate in other parts of Canada? Check out the weather and climate in places like Vancouver, Toronto, Niagara Falls, or have a look at other destinations in Canada.
Best time to visit Thunder Bay?
The best time to visit Thunder Bay for pleasant to warm weather is May through September. There might be some rain during this period, but the temperatures are just right for exploring Thunder Bay.
Climate Table of Thunder Bay
The climate table of Thunder Bay shows the average temperatures, precipitation, snow, and UV index per month. The table gives an overview of the average day and night temperatures in degrees Celsius, the total amount of precipitation in millimetres, the total snowfall in centimetres, and the UV index for each month. Precipitation is always measured as water, even if it's snow or hail.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Temp. max (°C) | -7 | -7 | 1 | 7 | 15 | 21 | 25 | 23 | 19 | 11 | 4 | -3 |
| Temp. min (°C) | -16 | -19 | -10 | -3 | 4 | 10 | 13 | 13 | 9 | 3 | -4 | -12 |
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| Precipitation (mm) | 19 | 24 | 75 | 92 | 67 | 123 | 107 | 67 | 81 | 84 | 81 | 48 |
| Snow (cm) | 32 | 43 | 18 | 19 | 3,4 | 0 | 0 | 0 | 0 | 1,5 | 9,3 | 22 |
| UV Index | 2 | 4 | 5 | 6 | 7 | 7 | 8 | 5 | 4 | 3 | 2 | 1 |
Click on the month name to see more weather details, like daily averages, temperatures, and precipitation for the past years in that month.
- Average yearly temperature: 10°C
- Highest temperature: 25°C in July
- Lowest temperature: -7°C in January and February
- Precipitation*: 868 mm per year, averaging 72 mm per month
- Snowfall: 148 cm per year
- Driest months: 19 mm in January, 24 mm in February and 48 mm in December
- Wettest months: 123 mm in June, 107 mm in July and 92 mm in April
*Precipitation is measured as a combination of rain, snow, and hail
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Table of Contents
Average Temperature per Month in Thunder Bay
This graph shows the average maximum temperatures per month in Thunder Bay, Canada. The temperatures are shown in degrees Celsius and the average is calculated based on the recorded temperatures per month from past years.
Average Precipitation per Month in Thunder Bay
This graph shows how much precipitation Thunder Bay, Canada, gets on average per month. Precipitation is always measured as water, even if it's snow or hail. This makes it easy to compare how much has fallen, regardless of the form of precipitation. The amount of precipitation is measured in millimetres and the average is calculated based on the recorded precipitation per month from past years.
Average Snowfall per Month in Thunder Bay
This graph shows how much snow Thunder Bay, Canada, gets on average per month. The amount of snowfall is measured in centimetres and the average is calculated based on the recorded snowfall per month from past years.
Average UV Index per Month in Thunder Bay
This graph shows the average UV index per month in Thunder Bay, Canada. The UV index indicates the intensity of ultraviolet radiation and ranges from 0 to a maximum of 11.
Yearly Temperature in Thunder Bay
This graph shows the average yearly temperature in Thunder Bay, Canada. The yearly temperature, expressed in degrees Celsius, is the average of all twelve monthly temperatures summed up for that year.
Total Yearly Precipitation in Thunder Bay
This chart shows the total yearly precipitation in Thunder Bay, Canada, over the past few years. The total yearly precipitation, measured in millimetres, is the sum of all the rain that fell in the twelve months of that year.
Total Yearly Snowfall in Thunder Bay
This chart shows the total yearly snowfall in Thunder Bay, Canada, over the past few years. The total yearly snowfall, measured in centimetres, is the sum of all the snow that fell in the twelve months of that year.
Weather experiences in Thunder Bay
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Average Weather in Thunder Bay by Month
Click on a month below to see detailed weather info for Thunder Bay. Based on historical weather data, you can see the average temperature, precipitation, wind, and UV index for each day of the month.
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