Vannes experiences a mild oceanic climate, with temperatures varying significantly across the seasons. Winters are cool and unpredictable, with January being the coldest month, averaging around 6°C, while February's average temperature is slightly warmer at 8°C. As spring arrives in March, temperatures gradually rise to an average of 9°C, followed by a consistent warming trend throughout April and May, with averages reaching as high as 12°C and 17°C, respectively. Summer months are warm, but not excessively hot, with July and August averaging around 18°C, while September's temperature returns to the same level as August. Autumn brings a noticeable drop in temperatures, particularly from October onwards, with November and December experiencing cooler averages of 8°C.