Visiting local bars in Retz is more fun when you know what the weather holds. These rainfall averages and temperatures can help you determine the best time for bar-hopping. The hottest months are usually July and August, with an average temperature of 19°C, while the coldest months are January and February, with an average of 2°C. The snowiest months in Retz are December, November, April and January, with each month seeing an average of 26 cm of snowfall.