Taking into account the local weather in Kilmartin 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 55°F, while the coldest months are January and February with an average of 40°F. The rainiest months in Kilmartin are October, December, November, and January, with each month seeing an average of 10 inches of rainfall.