January in Néa Ionía averages a daily high of 13.8°C with nights around 6.9°C. Expect roughly 7.4 wet days totalling 46.6mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Néa Ionía is April–May.
Based on HELLINIKON, GR (15.1km), 1995–2024. 21 years of January data.