December in Giresun averages a daily high of 12.9°C with nights around 5.9°C. Expect roughly 14.3 wet days totalling 135.5mm. Demanding conditions — pack for it and plan indoor options.
Across the year, the best time to visit Giresun is May–October.
Based on GIRESUN, TU (0.4km), 1995–2024. 14 years of December data.