December in Orkney averages a daily high of 31.8°C with nights around 15.8°C. Expect roughly 15.8 wet days totalling 154.1mm. Demanding conditions — pack for it and plan indoor options.
Across the year, the best time to visit Orkney is May–August.
Based on POTCHEFSTROOM, SF (47.8km), 1995–2024. 17 years of December data.