Climate and monthly weather forecast
Isle Royale National Park, MI

Calm evening waters at the Rock Harbor in Isle Royale National Park, Michigan, USA
Calm evening waters at the Rock Harbor in Isle Royale National Park, Michigan, USA

Weather in January

January, the same as December, in Isle Royale National Park, Michigan, is another subzero cold winter month, with an average temperature varying between 17.6°F (-8°C) and -0.4°F (-18°C). The coldest month is January, with an average high-temperature of 17.6°F (-8°C) and an average low-temperature of -0.4°F (-18°C). Weather in January »

Weather in February

February, the last month of the winter in Isle Royale National Park, is another freezing cold month, with an average temperature ranging between max 21.2°F (-6°C) and min 1.4°F (-17°C). In Isle Royale National Park, the average high-temperature in February is relatively the same as in January - a still subzero cold 21.2°F (-6°C). Weather in February »

Weather in March

The first month of the spring, March, is a cold month in Isle Royale National Park, Michigan, with an average temperature varying between 12.2°F (-11°C) and 32°F (0°C). In March, the average high-temperature increases from a subzero cold 21.2°F (-6°C) in February to a wintry 32°F (0°C). Weather in March »

Weather in April

April is a chilly spring month in Isle Royale National Park, Michigan, with an average temperature varying between 46.4°F (8°C) and 26.6°F (-3°C). In April, the average high-temperature soars, from a cold 32°F (0°C) in March, to a frosty 46.4°F (8°C). Weather in April »

Weather in May

The last month of the spring, May, is a moderate month in Isle Royale National Park, Michigan, with an average temperature varying between 37.4°F (3°C) and 59°F (15°C). In May, the average high-temperature increases from a chilly 46.4°F (8°C) in April to a mild 59°F (15°C). Weather in May »

Weather in June

The first month of the summer, June, is a pleasant month in Isle Royale National Park, Michigan, with temperature in the range of an average low of 46.4°F (8°C) and an average high of 68°F (20°C). In Isle Royale National Park, the average high-temperature in June rises from a mild 59°F (15°C) in May to a pleasant 68°F (20°C). Weather in June »

Weather in July

July is a warm summer month in Isle Royale National Park, Michigan, with an average temperature fluctuating between 75.2°F (24°C) and 53.6°F (12°C). July is the warmest month, with an average high-temperature of 75.2°F (24°C) and an average low-temperature of 53.6°F (12°C). Weather in July »

Weather in August

The last month of the summer, August, is also an agreeable month in Isle Royale National Park, Michigan, with temperature in the range of an average low of 51.8°F (11°C) and an average high of 71.6°F (22°C). In Isle Royale National Park, the average high-temperature in August is essentially the same as in July - a pleasant 71.6°F (22°C). Weather in August »

Weather in September

September, the first month of the autumn in Isle Royale National Park, is still a comfortable month, with an average temperature ranging between min 44.6°F (7°C) and max 62.6°F (17°C). In September, the average high-temperature drops from an agreeable 71.6°F (22°C) in August to an enjoyable 62.6°F (17°C). Weather in September »

Weather in October

October, like September, in Isle Royale National Park, Michigan, is another fresh autumn month, with an average temperature ranging between min 35.6°F (2°C) and max 51.8°F (11°C). In Isle Royale National Park, the average high-temperature in October drops from an enjoyable 62.6°F (17°C) in September to a fresh 51.8°F (11°C). Weather in October »

Weather in November

November, the last month of the autumn in Isle Royale National Park, is also a wintry month, with an average temperature fluctuating between 35.6°F (2°C) and 23°F (-5°C). In November, the average high-temperature plummets from a cool 51.8°F (11°C) in October to a cold 35.6°F (2°C). Weather in November »

Weather in December

The first month of the winter, December, is also a subzero cold month in Isle Royale National Park, Michigan, with an average temperature varying between 23°F (-5°C) and 6.8°F (-14°C). In December, the average high-temperature decreases from a cold 35.6°F (2°C) in November to a freezing cold 23°F (-5°C). Weather in December »
[Resources]

FAQ

What is the coldest month in Isle Royale National Park?

With an average high-temperature of 17.6°F (-8°C) and an average low-temperature of -0.4°F (-18°C), January is the coldest month in Isle Royale National Park.

How much does it rain in Isle Royale National Park?

In Isle Royale National Park, Michigan, during the entire year, the rain falls for 125 days and collects up to 30.55" (776mm) of precipitation.

When is the ocean coldest in Isle Royale National Park?

January through April, with an average ocean temperature of 35.6°F (2°C), are months with the coldest seawater in Isle Royale National Park, Michigan.

What are the months with the lowest UV index in Isle Royale National Park?

January, February, November and December, with an average maximum UV index of 1, are months with the lowest UV index in Isle Royale National Park, Michigan.

What is the driest month in Isle Royale National Park?

The month with the least rainfall is February, when the rain falls for 8 days and typically collects 1.5" (38mm) of precipitation.

When is Daylight Saving Time (DST) in Isle Royale National Park?

On Sunday, March 13. 2022, at 2:00 am, Daylight Saving Time starts in Isle Royale National Park, and the time zone changes from EST to EDT. Daylight Saving Time ends Sunday, November 6. 2022, at 2:00 am, and the time zone reverts from EDT to EST.

When are the longest days in Isle Royale National Park?

The month with the longest days in Isle Royale National Park is June, with an average of 15h and 59min of daylight.

What is the month with the highest UV index in Isle Royale National Park?

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

What is the warmest month in Isle Royale National Park?

The warmest month in Isle Royale National Park, Michigan, is July, with an average high-temperature of 75.2°F (24°C) and an average low-temperature of 53.6°F (12°C).

What month has the most sunshine in Isle Royale National Park?

With an average of 10h of sunshine, July has the most sunshine of the year.

What is the month with the warmest ocean in Isle Royale National Park?

With an average ocean temperature of 55.4°F (13°C), August is the month with the warmest seawater in Isle Royale National Park.

What is the wettest month in Isle Royale National Park?

The month with the most rainfall in Isle Royale National Park, Michigan, is September, when the rain falls for 13 days and typically aggregates up to 3.39" (86mm) of precipitation.

What is the month with the least sunshine in Isle Royale National Park?

November and December, with an average of 3h of sunshine, are months with the least sunshine in Isle Royale National Park.

What is the month with the shortest days in Isle Royale National Park?

With an average of 8h and 27min of daylight, December has the shortest days of the year.

Average rainfall
Isle Royale National Park, MI

Average rainfall - Isle Royale National Park, MI

The wettest month (with the highest rainfall) is September (3.4").
The driest month (with the least rainfall) is February (1.5").

[Resources]

Average rainfall days
Isle Royale National Park, MI

Average rainfall days - Isle Royale National Park, MI

The months with the highest number of rainy days are June and September (13 days).
The months with the least rainy days are February and April (8 days).

[Resources]

Average sea temperature
Isle Royale National Park, MI

Average sea temperature - Isle Royale National Park, MI

The best month for swimming (with the highest average sea temperature) is August (55°F).
The coldest months (with the lowest average sea temperature) are January, February, March and April (36°F).

[Resources]

Average daylight / Average sunshine
Isle Royale National Park, MI

Average daylight / Average sunshine - Isle Royale National Park, MI

The month with the longest days is June (Average daylight: 15h and 59min).
The month with the shortest days is December (Average daylight: 8h and 27min).

The month with the most sunshine is July (Average sunshine: 10h).
The months with the least sunshine are November and December (Average sunshine: 3h).

[Resources]

Average UV index
Isle Royale National Park, MI

Average UV index - Isle Royale National Park, MI

The months with the highest UV index are June and July (UV index 7).
The months with the lowest UV index are January, February, November and December (UV index 1).

[Resources]

Weather forecast for your location

1. Click Locate me button
2. Allow the app to use your location
* you will be automatically redirected to the weather forecast for your location