Taking into account the local weather in Gartocharn is an important factor for planning your visit, especially if you plan to spend your trip poolside. The hottest months are usually July and August with an average temp of 56°F, while the coldest months are February and January with an average of 41°F. The rainiest months in Gartocharn are October, December, November, and January, with each month seeing an average of 7 inches of rainfall.