Planning for the weather is a good way to make your trip to Aquitania relaxing and enjoyable, especially when you’re splurging. The hottest months are usually January and February with an average temp of 55°F, while the coldest months are August and September with an average of 55°F. The rainiest months in Aquitania are April, May, October, and March, with each month seeing an average of 19 inches of rainfall.