Overview: Acquitaine - France Acquitaine (France) in general has a mild climate. Temperatures during the day are in the range from 11 °C (52 °F) in January to 26 °C (78 °F) in August. Sea temperatures are in the following range: 11 °C (53 °F) in February to 21 °C (70 °F) in August. The least rainy month in Acquitaine is July with its 8 days of rain, the rainiest month is November, when it rains 13 days. The highest night temperatures could be experienced in August with 16 °C (61 °F), the lowest in January with 4 °C (39 °F).