April weather forecast
Isle Royale National Park, MI

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.