Weather is probably a major factor when you plan your trip to Izunokuni, but bear in mind that cheaper options are usually available when the weather isn't as good. The hottest months are usually August and July, with an average temperature of 23°C, while the coldest months are January and February, with an average of 7°C. The rainiest months in Izunokuni are June, July, September and October, with each month seeing an average of 313 mm of rainfall.