October weather forecast
Isle Royale National Park, MI

October ensures the full arrival of autumn with its cool and crisp weather. The noticeable decrease in temperature from September sets the tone for the upcoming winter. Rainfall quantities remain relatively similar, contributing to the moisture in the air. The daylight hours continue to reduce, implying shorter days ahead. Temperatures hover from 36°F (2.2°C) to 52°F (11.1°C), paving the way for the colder months.

Temperature

The start of October in Isle Royale National Park signals a decrease in the average high-temperature, transitioning from a comfortable 62.6°F (17°C) in September to a fresh 51.8°F (11°C). October witnesses an average nighttime temperature of 35.6°F (2°C).

Rainfall

In Isle Royale National Park, during October, the rain falls for 11 days and regularly aggregates up to 2.72" (69mm) of precipitation. 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.

Ocean temperature

In Isle Royale National Park, Michigan, in October, the average water temperature is 46.4°F (8°C).
Note: If planning to swim in 46.4°F (8°C) under 50°F (10°C), wear a protective suit. Neglecting this advice might cause immediate cold shock and troubled breathing. A splash around 55.4°F (13°C) is not much warmer.

Daylight

The average length of the day in October in Isle Royale National Park is 10h and 49min.
On the first day of October in Isle Royale National Park, sunrise is at 7:55 am and sunset at 7:34 pm. On the last day of the month, sunrise is at 8:40 am and sunset at 6:38 pm EDT.

Sunshine

In October, the average sunshine is 4h.

UV index

The average daily maximum UV index in October in Isle Royale National Park is 2. A UV Index reading of 2, and below, represents a low health risk from unsafe exposure to UV radiation for the average person.
Note: A maximum UV index of 2 in October translates into the following recommendations:
While most can endure approximately an hour in the sun without burning, children always require protection from sunlight. The Sun is at its harshest during midday; protect yourself by staying in shaded areas and minimizing exposure. On days when the sun blazes, arm yourself with sunglasses that block UVA and UVB radiation.