When is the best time to go to Thunder Bay
The chart above shows the best time of year to visit Thunder Bay, Canada. These are based on an analysis of weather averages such as temperature, rainfall and number of hours of sunshine. These ratings are based solely on the climate and do not take into account other factors such as accommodation prices and how busy it is likely to be.
Average temperatures in Thunder Bay
Thunder Bay weather by month
Please note our recommendations for when to visit Thunder Bay are based solely on the weather and do not take into accounts accommodation prices, how busy it will be and what events are on.
January
| Temp | Rain | Sunshine | Day length |
|---|---|---|---|
| -8°C | 38mm | 4.2hrs | 10hrs |
January in Thunder Bay is generally reasonably dry with the temperature being very cold.
Based on weather alone, this is probably a time of year to avoid going to Thunder Bay for your holidays. The weather is often pretty bad and not conducive to spending time outdoors.
January is in the winter in Thunder Bay and is typically the coldest month of the year. Daytime maximum temperatures average around a freezing -9°C (15°F), whilst at night -21°C (-6°F) is normal.
On average January is the driest month of the year in Thunder Bay with around 38mm 1.5 inches of rain making it a reasonably dry time to visit. This rainfall is typically spread over 11 days, although this may vary considerably.
On the flip side this corresponds to an average of 4.2 hours of sunshine per day.
Thunder Bay weather in January »
February
| Temp | Rain | Sunshine | Day length |
|---|---|---|---|
| -6°C | 27mm | 5.3hrs | 11.3hrs |
February in Thunder Bay is generally dry with the temperature being very cold.
Although outside the main holiday season, there is still plenty of pretty acceptable weather around this time of year. This makes it an okay time to visit Thunder Bay.
February is in the winter in Thunder Bay and is typically the 2nd coldest month of the year. Daytime maximum temperatures average around a freezing -7°C (20°F), whilst at night -19°C (-2°F) is normal.
On average February is the 2nd driest month of the year in Thunder Bay with around 27mm 1 inches of rain making it a dry time to visit. This rainfall is typically spread over 9 days, although this may vary considerably.
On the flip side this corresponds to an average of 5.3 hours of sunshine per day.
Thunder Bay weather in February »
March
| Temp | Rain | Sunshine | Day length |
|---|---|---|---|
| -0°C | 42mm | 5.8hrs | 12.9hrs |
The weather in March in Thunder Bay is characteristically cold and reasonably dry.
Based on weather alone, this is probably a time of year to avoid going to Thunder Bay for your holidays. The weather is often pretty bad and not conducive to spending time outdoors.
March is in the spring in Thunder Bay and is typically the 3rd coldest month of the year. Daytime maximum temperatures average around a freezing -0°C (32°F), whilst at night -12°C (11°F) is normal.
On average March is the 3rd driest month of the year in Thunder Bay with around 42mm 1.6 inches of rain making it a reasonably dry time to visit. This rainfall is typically spread over 10 days, although this may vary considerably.
On the flip side this corresponds to an average of 5.8 hours of sunshine per day.
Thunder Bay weather in March »
April
| Temp | Rain | Sunshine | Day length |
|---|---|---|---|
| 7°C | 45mm | 8hrs | 14.7hrs |
Thunder Bay's weather in April is typically cool and reasonably dry in nature.
Although outside the main holiday season, there is still plenty of quite acceptable weather around this time of year. This makes it an okay time to visit Thunder Bay.
April is in the spring in Thunder Bay and is typically the 4th coldest month of the year. Daytime maximum temperatures average around a cold 8°C (46°F), whilst at night -3°C (26°F) is normal.
On average April is the 4th driest month of the year in Thunder Bay with around 45mm 1.8 inches of rain making it a reasonably dry time to visit. This rainfall is typically spread over 9 days, although this may vary considerably.
On the flip side this corresponds to an average of 8 hours of sunshine per day.
Thunder Bay weather in April »
May
| Temp | Rain | Sunshine | Day length |
|---|---|---|---|
| 14°C | 70mm | 9hrs | 16.4hrs |
May is a reasonably dry month in Thunder Bay and the temperature is generally cool.
Although outside the main holiday season, there is still plenty of relatively acceptable weather around this time of year. This makes it an okay time to visit Thunder Bay.
May is in the spring in Thunder Bay and is typically the 5th coldest month of the year. Daytime maximum temperatures average around a cool 15°C (59°F), whilst at night 2°C (36°F) is normal.
On average May is the 5th driest month of the year in Thunder Bay with around 70mm 2.8 inches of rain making it a reasonably dry time to visit. This rainfall is typically spread over 11 days, although this may vary considerably.
On the flip side this corresponds to an average of 9 hours of sunshine per day.
June
| Temp | Rain | Sunshine | Day length |
|---|---|---|---|
| 18°C | 82mm | 9.4hrs | 10hrs |
Thunder Bay's weather in June is typically mild and a little damp in nature.
Although outside the main holiday season, there is still plenty of relatively acceptable weather around this time of year. This makes it a good time to visit Thunder Bay.
June is in the summer in Thunder Bay and is typically the 6th coldest month of the year. Daytime maximum temperatures average around 20°C (68°F), whilst at night 7°C (45°F) is normal.
On average June is the 6th driest month of the year in Thunder Bay with around 82mm 3.2 inches of rain making it a a little damp time to visit. This rainfall is typically spread over 13 days, although this may vary considerably.
On the flip side this corresponds to an average of 9.4 hours of sunshine per day.
July
| Temp | Rain | Sunshine | Day length |
|---|---|---|---|
| 21°C | 82mm | 10.3hrs | 11.3hrs |
July in Thunder Bay is generally a little damp with the temperature being mild.
It is perhaps the perfect month to visit Thunder Bay, with some very good weather at this time of year.
July is in the summer in Thunder Bay and is typically the 6th warmest month of the year. Daytime maximum temperatures average around 24°C (75°F), whilst at night 11°C (52°F) is normal.
On average July is the 6th wettest month of the year in Thunder Bay with around 82mm 3.2 inches of rain making it a a little damp time to visit. This rainfall is typically spread over 12 days, although this may vary considerably.
On the flip side this corresponds to an average of 10.3 hours of sunshine per day.
August
| Temp | Rain | Sunshine | Day length |
|---|---|---|---|
| 20°C | 88mm | 9.1hrs | 12.9hrs |
The weather in August in Thunder Bay is characteristically mild and a little damp.
It is perhaps the perfect month to visit Thunder Bay, with some extremely good weather at this time of year.
August is in the summer in Thunder Bay and is typically the 5th warmest month of the year. Daytime maximum temperatures average around 22°C (72°F), whilst at night 10°C (50°F) is normal.
On average August is the 5th wettest month of the year in Thunder Bay with around 88mm 3.5 inches of rain making it a a little damp time to visit. This rainfall is typically spread over 13 days, although this may vary considerably.
On the flip side this corresponds to an average of 9.1 hours of sunshine per day.
Thunder Bay weather in August »
September
| Temp | Rain | Sunshine | Day length |
|---|---|---|---|
| 15°C | 88mm | 5.8hrs | 14.7hrs |
Thunder Bay's weather in September is typically mild and a little damp in nature.
Although outside the main holiday season, there is still plenty of relatively acceptable weather around this time of year. This makes it an okay time to visit Thunder Bay.
September is in the fall / autumn in Thunder Bay and is typically the 4th warmest month of the year. Daytime maximum temperatures average around a cool 17°C (62°F), whilst at night 6°C (42°F) is normal.
On average September is the 4th wettest month of the year in Thunder Bay with around 88mm 3.4 inches of rain making it a a little damp time to visit. This rainfall is typically spread over 13 days, although this may vary considerably.
On the flip side this corresponds to an average of 5.8 hours of sunshine per day.
Thunder Bay weather in September »
October
| Temp | Rain | Sunshine | Day length |
|---|---|---|---|
| 9°C | 60mm | 4.4hrs | 16.4hrs |
October is a reasonably dry month in Thunder Bay and the temperature is generally cool.
Based on weather alone, this is probably a time of year to avoid going to Thunder Bay for your holidays. The weather is often pretty bad and not conducive to spending time outdoors.
October is in the fall / autumn in Thunder Bay and is typically the 3rd warmest month of the year. Daytime maximum temperatures average around a cool 10°C (51°F), whilst at night 1°C (33°F) is normal.
On average October is the 3rd wettest month of the year in Thunder Bay with around 60mm 2.4 inches of rain making it a reasonably dry time to visit. This rainfall is typically spread over 11 days, although this may vary considerably.
On the flip side this corresponds to an average of 4.4 hours of sunshine per day.
Thunder Bay weather in October »
November
| Temp | Rain | Sunshine | Day length |
|---|---|---|---|
| 2°C | 49mm | 3.3hrs | 10hrs |
The weather in November in Thunder Bay is characteristically cold and reasonably dry.
Based on weather alone, this is probably a time of year to avoid going to Thunder Bay for your holidays. The weather is often relatively bad and not conducive to spending time outdoors.
November is in the fall / autumn in Thunder Bay and is typically the 2nd warmest month of the year. Daytime maximum temperatures average around a freezing 2°C (35°F), whilst at night -7°C (20°F) is normal.
On average November is the 2nd wettest month of the year in Thunder Bay with around 49mm 1.9 inches of rain making it a reasonably dry time to visit. This rainfall is typically spread over 10 days, although this may vary considerably.
On the flip side this corresponds to an average of 3.3 hours of sunshine per day.
Thunder Bay weather in November »
December
| Temp | Rain | Sunshine | Day length |
|---|---|---|---|
| -6°C | 45mm | 3.4hrs | 11.3hrs |
December in Thunder Bay is generally reasonably dry with the temperature being very cold.
Based on weather alone, this is probably a time of year to avoid going to Thunder Bay for your holidays. The weather is often pretty bad and not conducive to spending time outdoors.
December is in the winter in Thunder Bay and is typically the warmest month of the year. Daytime maximum temperatures average around a freezing -6°C (21°F), whilst at night -16°C (3°F) is normal.
On average December is the wettest month of the year in Thunder Bay with around 45mm 1.8 inches of rain making it a reasonably dry time to visit. This rainfall is typically spread over 11 days, although this may vary considerably.
On the flip side this corresponds to an average of 3.4 hours of sunshine per day.
Other monthly averages
Thunder Bay weather stats
| Hottest month: | July | 23.4°C 74.1°F |
|---|---|---|
| Driest month: | February | 27mm 1.1ins |
| Sunniest month: | July | 10.3hrs |
| Coldest month: | January | -9.5°C 14.9°F |
| Wettest month: | August | 88mm 3.5ins |
| Warmest sea: | August | 14.2°C 57.6°F |
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