Planning for the weather is a good way to make your trip to Shima relaxing and enjoyable, especially when you’re splurging. The hottest months are usually August and July with an average temp of 68°F, while the coldest months are January and February with an average of 32°F. The rainiest months in Shima are July, September, October, and August, with each month seeing an average of 9 inches of rainfall.