You might spend a lot of your holiday inside, but if you're planning to venture beyond the casino, looking at local weather trends is a good idea. The hottest months are usually August and July, with an average temperature of 24°C, while the coldest months are January and February, with an average of 8°C. The rainiest months in Yawatahama are June, July, September and August, with each month seeing an average of 243 mm of rainfall.