Biarritz has a humid oceanic climate all through the year.
Summer (June – September): Summers are warm with an average temperature of 24 degree Celsius. Night time averages a low of 14 degree Celsius in June rising to 16 degree Celsius in August. This is best time to visit Biarritz as the weather is very good for outdoor activities.
Winter (December – February): Winter sees an average high of 13 degree Celsius with an average low of 6 degree Celsius and is considered as off season in Biarritz.
Spring (March – May): The temperature ranges around 15 degree Celsius to 18 degree Celsius during spring. Sea temperatures are quite chilly. Spring is considered as the peak season as it offers the best deal and reasonable weather despite the occasional rain showers.
Autumn (September – November): In autumn, the temperature is around 19 degree Celsius which is also a good season to visit Biarritz.
The best time to visit Biarritz is between the months of June and September.