Weather will likely play an important role when you plan your trip to Ardnamurchan Peninsula, but bear in mind that cheaper options are usually available when the weather isn't as good. The hottest months are usually August and July, with an average temperature of 13°C, while the coldest months are February and January, with an average of 6°C. The rainiest months in Ardnamurchan Peninsula are October, December, November and January, with each month seeing an average of 218 mm of rainfall.