You'll likely spend much of your trip indoors, but if you want to see more of the area, 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 5°C. The rainiest months in Motegi are July, September, October and June, with each month seeing an average of 192 mm of rainfall.