You'll likely spend much of your trip indoors, but if you want to see more of the area, taking a look at local weather data can help you. 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 4°C. The rainiest months in Kiryu are July, September, October and June, with each month seeing an average of 233 mm of rainfall.