Taking into account the local weather in Longdenville is an important factor for planning your visit, especially if you plan to spend your trip poolside. The hottest months are usually September and October with an average temp of 81°F, while the coldest months are February and January with an average of 78°F. The rainiest months in Longdenville are October, August, November, and July, with each month seeing an average of 8 inches of rainfall.