January in Derry averages a daily high of 8.3°C with nights around 3.9°C. Expect roughly 22.4 wet days totalling 117.6mm. A hard month to visit for comfort alone.
Across the year, the best time to visit Derry is June–September.
Based on MALIN HEAD, EI (41.6km), 1995–2024. 22 years of January data.