April weather forecast
Isle Royale National Park, MI

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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 April

April indicates the arrival of spring in Isle Royale National Park, Michigan. Weather conditions transform significantly from the chilling atmosphere of March. April also marks an increase in daylight hours, indicating longer, sunnier days ahead. The amount of rainfall remains similar to the preceding month. During this month, the average temperature jumps from 27°F (-2.8°C) to 46°F (7.8°C), signaling the onset of season change.

Temperature

The shift from March to April in Isle Royale National Park sees a distinct increase in the average high-temperature, escalating from a wintry 32°F (0°C) to a frosty 46.4°F (8°C). An average low-temperature of 26.6°F (-3°C) is recorded during the nights in April in Isle Royale National Park.

Rainfall

In April, the rain falls for 8 days. Throughout April, 1.73" (44mm) of precipitation is accumulated. In Isle Royale National Park, during the entire year, the rain falls for 125 days and collects up to 30.55" (776mm) of precipitation.

Ocean temperature

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.
Note: In swimming undertakings, this is deemed life-threatening and highly risky. The cold water induces intense discomfort and leads to swift hyperventilation. A specialized swimsuit is indispensable to decrease thermal injuries.

Daylight

In Isle Royale National Park, the average length of the day in April is 13h and 41min.
On the first day of April, sunrise is at 7:32 am and sunset at 8:26 pm. On the last day of the month, sunrise is at 6:37 am and sunset at 9:07 pm EDT.

Sunshine

In Isle Royale National Park, the average sunshine in April is 7h.

UV index

In April, the average daily maximum UV index is 4. A UV Index estimate of 3 to 5 represents a medium vulnerability from exposure to the Sun's UV radiation for the ordinary person.
Note: The maximum daily UV index of 4 in April converts into the following recommendations:
Proceed with care. Light skin individuals may be exposed to burns in fewer than 30 minutes. For health reasons, it's advisable to reduce direct sun exposure during peak hours around midday. Always opt for UVA and UVB-resistant sunglasses on radiant days.
Updated: Feb 12, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What is the average April temperature in Isle Royale National Park?

During April, Isle Royale National Park experiences an average high-temperature of 46.4°F (8°C) and a low-temperature of 26.6°F (-3°C).

How much does it rain in Isle Royale National Park in April?

In Isle Royale National Park, Michigan, in April, during 8 rainfall days, 1.73" (44mm) of precipitation is typically accumulated.

What months are 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 is the water temperature in April in Isle Royale National Park?

In April, the average ocean temperature in Isle Royale National Park is 35.6°F (2°C). For swimming, this is considered extremely cold, dangerous, and life-threatening. Unless suitably protected with insulated waterproof clothing, hypothermia quickly occurs.

What is the average length of the day in April in Isle Royale National Park?

In April, the average day length in Isle Royale National Park, Michigan, is 13h and 41min.

When is the sunrise / sunset in April in Isle Royale National Park?

In April, on the first day of the month, sunrise is at 7:32 am and sunset at 8:26 pm. On the last day of the month, sunrise is at 6:37 am and sunset at 9:07 pm EDT.

How long on average sun shines in April in Isle Royale National Park?

In April, the average sunshine duration is 7h.

What is the UV index intensity in April in Isle Royale National Park?

The average daily maximum UV index in April is 4. A UV Index value of 3 to 5 symbolizes a medium health risk from unsafe exposure to Sun's UV rays.
Average high temperature
Average rainfall days
Average daylight
Average sunshine
Average UV index

Average temperature in April
Isle Royale National Park, MI

Average temperature in April - Isle Royale National Park, MI
  • Average high temperature in April: 46°F

The warmest month (with the highest average high temperature) is July (75°F).
The month with the lowest average high temperature is January (18°F).

  • Average low temperature in April: 27°F

The month with the highest average low temperature is July (54°F).
The coldest month (with the lowest average low temperature) is January (0°F).

Average rainfall in April
Isle Royale National Park, MI

Average rainfall in April - Isle Royale National Park, MI
  • Average rainfall in April: 1.7"

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

Average rainfall days in April
Isle Royale National Park, MI

Average rainfall days in April - Isle Royale National Park, MI
  • Average rainfall days in April: 8 days

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).

Average sea temperature in April
Isle Royale National Park, MI

Average sea temperature in April - Isle Royale National Park, MI
  • Average sea temperature in April: 36°F

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).

Average daylight in April /
Average sunshine in April
Isle Royale National Park, MI

Average daylight in April / Average sunshine in April - Isle Royale National Park, MI
  • Average daylight in April: 13h and 4min

The month with the longest days is June (Average daylight: 16h and 0min).
The month with the shortest days is December (Average daylight: 8h and 30min).

  • Average sunshine in April: 7h

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

Average UV index in April
Isle Royale National Park, MI

Average UV index in April - Isle Royale National Park, MI
  • Average UV index in April: 4

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).

Isle Royale National Park, Michigan, USA

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