Weather is only one factor, but it can really affect your travel plans, especially when you are planning a longer stay in Chirihamamachi. The hottest months are usually August and July with an average temp of 74°F, while the coldest months are January and February with an average of 40°F. The rainiest months in Chirihamamachi are July, September, August, and December, with each month seeing an average of 12 inches of rainfall.