Planning for the weather is a good way to make your trip to Gotemba relaxing and enjoyable, especially when you’re splurging. The hottest months are usually August and July with an average temp of 70°F, while the coldest months are January and February with an average of 39°F. The rainiest months in Gotemba are July, September, October, and June, with each month seeing an average of 11 inches of rainfall.