Planning for the weather is an important factor for making your trip to Shirahama a success, especially when you're splurging. The hottest months are usually August and July, with an average temperature of 25°C, while the coldest months are January and February, with an average of 9°C. The rainiest months in Shirahama are June, July, September and October, with each month seeing an average of 306 mm of rainfall.