January in Mostaganem averages a daily high of 16.5°C with nights around 5°C. Expect roughly 8 wet days totalling 52.7mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Mostaganem is April–June.
Based on MOSTAGANEM, AG (5.9km), 1995–2024. 13 years of January data.