Thunder Bay
Canada
Long-term weather forecast
Long-term weather forecast

Monthly weather forecast and climate
Thunder Bay, Canada

January, the same as December, in Thunder Bay, Canada, is another subzero cold winter month, with average temperature fluctuating between -8°C (17.6°F) and -20.6°C (-5.1°F). With an average high-temperature of -8°C (17.6°F) and an average low-temperature of -20.6°C (-5.1°F), January is the coldest month. Weather in January »
February, the last month of the winter, in Thunder Bay, is another freezing cold month, with average temperature varying between -5°C (23°F) and -17.7°C (0.1°F). In Thunder Bay, the average high-temperature in February marginally rises, from -8°C (17.6°F) in January, to a still freezing cold -5°C (23°F). Weather in February »

March, the first month of the spring, in Thunder Bay, is a wintry month, with average temperature varying between 0.6°C (33.1°F) and -10.7°C (12.7°F). In March, the average high-temperature rises, from a freezing cold -5°C (23°F) in February, to a cold 0.6°C (33.1°F). Weather in March »

April is a chilly spring month in Thunder Bay, Canada, with temperature in the range of an average low of -3.2°C (26.2°F) and an average high of 9.2°C (48.6°F). In April, the average high-temperature soars, from a cold 0.6°C (33.1°F) in March, to a frosty 9.2°C (48.6°F). Weather in April »

The last month of the spring, May, is a comfortable month in Thunder Bay, Canada, with average temperature varying between 16.2°C (61.2°F) and 2.2°C (36°F). In Thunder Bay, the average high-temperature rises, from a frosty 9.2°C (48.6°F) in April, to an enjoyable 16.2°C (61.2°F). Weather in May »

The first month of the summer, June, is an agreeable month in Thunder Bay, Canada, with average temperature ranging between max 20.6°C (69.1°F) and min 7.1°C (44.8°F). In Thunder Bay, Canada, the average high-temperature in June marginally rises, from a comfortable 16.2°C (61.2°F) in May, to an agreeable 20.6°C (69.1°F). Weather in June »

July in Thunder Bay, Canada, is a warm summer month, with average temperature varying between 24.3°C (75.7°F) and 11.1°C (52°F). With an average high-temperature of 24.3°C (75.7°F) and an average low-temperature of 11.1°C (52°F), July is the warmest month. Weather in July »

The last month of the summer, August, is another warm month in Thunder Bay, Canada, with average temperature fluctuating between 10.4°C (50.7°F) and 23.3°C (73.9°F). In August, the average high-temperature is relatively the same as in July - a still moderately hot 23.3°C (73.9°F). Weather in August »

September, the first month of the autumn, in Thunder Bay, is also an enjoyable month, with average temperature fluctuating between 17.7°C (63.9°F) and 5.5°C (41.9°F). In Thunder Bay, the average high-temperature drops, from a moderately hot 23.3°C (73.9°F) in August, to an enjoyable 17.7°C (63.9°F). Weather in September »

October, the same as September, in Thunder Bay, Canada, is a frosty autumn month, with average temperature varying between 9.9°C (49.8°F) and -0.9°C (30.4°F). In Thunder Bay, Canada, the average high-temperature drops, from an enjoyable 17.7°C (63.9°F) in September, to a frosty 9.9°C (49.8°F). Weather in October »

November, the last month of the autumn, in Thunder Bay, is another cold month, with temperature in the range of an average high of 1.4°C (34.5°F) and an average low of -7.7°C (18.1°F). In Thunder Bay, the average high-temperature plummets, from a frosty 9.9°C (49.8°F) in October, to a cold 1.4°C (34.5°F). Weather in November »

December, the first month of the winter, in Thunder Bay, is still a freezing cold month, with average temperature varying between -5.5°C (22.1°F) and -16°C (3.2°F). In Thunder Bay, the average high-temperature decreases, from a wintry 1.4°C (34.5°F) in November, to a freezing cold -5.5°C (22.1°F). Weather in December »

What is the coldest month in Thunder Bay?

January is the coldest month in Thunder Bay, Canada, with an average high-temperature of -8°C (17.6°F) and an average low-temperature of -20.6°C (-5.1°F).

How many days does it rain in Thunder Bay?

In Thunder Bay, Canada, during the entire year, the rain falls for 92.6 days and collects up to 546.5mm (21.5") of precipitation.

What is the driest month in Thunder Bay?

January is the month with the least rainfall in Thunder Bay. Rain falls for 0.6 days and accumulates 0.4mm (0") of precipitation.

When does it snow in Thunder Bay?

Months with snowfall are January through May, September through December.

How much does it snow in Thunder Bay?

In Thunder Bay, Canada, during the entire year, snow falls for 62.7 days, and aggregates up to 1631mm (64.2") of snow.

What months are the sea coldest in Thunder Bay?

January through April, with an average sea temperature of 2°C (35.6°F), are months with the coldest seawater in Thunder Bay.

When is the lowest UV index in Thunder Bay?

January, February, November and December, with an average maximum UV index of 1, are months with the lowest UV index in Thunder Bay, Canada.

When it does not snow in Thunder Bay?

In Thunder Bay, Canada, snow does not fall in June through August.

When are the longest days in Thunder Bay?

The month with the longest days in Thunder Bay is June, with an average of 16h of daylight.

What month has the most sunshine in Thunder Bay?

June has the most sunshine of the year in Thunder Bay, Canada, with an average of 8.7h of sunshine.

What are the months with the highest UV index in Thunder Bay?

June and July, with an average maximum UV index of 7, are months with the highest UV index.

What is the warmest month in Thunder Bay?

With an average high-temperature of 24.3°C (75.7°F) and an average low-temperature of 11.1°C (52°F), July is the warmest month in Thunder Bay, Canada.

What is the rainiest month in Thunder Bay?

The month with the most rainfall is August when the rain falls for 12.3 days and typically aggregates up to 89.5mm (3.5") of precipitation.

When is the sea warmest in Thunder Bay?

August and September, with an average sea temperature of 13°C (55.4°F), are months with the warmest seawater.

What is the month with the least sunshine in Thunder Bay?

November and December, with an average of 2.9h of sunshine, are months with the least sunshine in Thunder Bay, Canada.

When does it snow the most in Thunder Bay?

The month with the most snowfall in Thunder Bay, Canada, is December when snow falls for 13.9 days and typically aggregates up to 389mm (15.3") of snow.

What is the month with the shortest days in Thunder Bay?

With an average of 8.4h of daylight, December has the shortest days of the year in Thunder Bay.
Average temperature - Thunder Bay, Canada
Average rainfall - Thunder Bay, Canada

The wettest month (with the highest rainfall) is August (89.5mm).
The driest month (with the lowest rainfall) is January (0.4mm).

Average rainfall days - Thunder Bay, Canada

The month with the highest number of rainy days is June (13.8 days).
The month with the lowest number of rainy days is January (0.6 days).

Average snowfall - Thunder Bay, Canada
Average snowfall days - Thunder Bay, Canada

The month with the highest number of snowfall days is December (13.9 days).
Months with the lowest number of snowfall days are June, July and August (0 days).

Average sea temperature - Thunder Bay, Canada

Best months for swimming (with the highest average sea temperature) are August and September (13°C).
Coldest months (with the lowest average sea temperature) are January, February, March and April (2°C).

Average daylight / Average sunshine - Thunder Bay, Canada

The month with the longest days is June (Average daylight: 16h).
The month with shortest days is December (Average daylight: 8.4h).

The month with most sunshine is June (Average sunshine: 8.7h).
Months with least sunshine are November and December (Average sunshine: 2.9).

Average UV index - Thunder Bay, Canada