Weather will likely play an important role when you plan your trip to Skellig Michael, but bear in mind that cheaper options are usually available when the weather isn't as good. The hottest months are usually July and August, with an average temperature of 15°C, while the coldest months are February and March, with an average of 8°C. The rainiest months in Skellig Michael are November, December, October and January, with each month seeing an average of 193 mm of rainfall.