Planning for the weather is a good way to make your trip to Arduaine relaxing and enjoyable, especially when you’re splurging. The hottest months are usually July and August, with an average temperature of 13°C, while the coldest months are January and February, with an average of 5°C. The rainiest months in Arduaine are October, December, November and January, with each month seeing an average of 266 mm of rainfall.