Except in the loftier hills districts above Willunga and around Mount Compass and Myponga, the weather is affected by the ocean. Temperatures tend to be a few degrees milder in summer and warmer in winter. Kangaroo Island's climate is best described as temperate. Temperatures tend to be a few degrees cooler in summer and warmer in winter than on mainland South Australia. The sea plays a large role in the island's daily weather pattern.
Conditions can change frequently during the day, so pack warm clothes, even during a summer holiday.