January in Giresun averages a daily high of 10.2°C with nights around 4°C. Expect roughly 15.8 wet days totalling 138mm. 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. 10 years of January data.