Planning for the weather is an important factor for making your trip to Wakayama 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 8°C. The rainiest months in Wakayama are July, June, September and August, with each month seeing an average of 218 mm of rainfall.