January in Gemlik averages a daily high of 10°C with nights around 1.6°C. Expect roughly 14.2 wet days totalling 86.8mm. Demanding conditions — pack for it and plan indoor options.
Across the year, the best time to visit Gemlik is April–October.
Based on BURSA, TU (28.7km), 1995–2024. 13 years of January data.