Generally, the weather in Biarritz throughout the duration of December is 8. High temperatures are around 13 and typical average low being around 6. The table below has further info:
| Month | Degrees Celsius |
|---|---|
| Temperature | 8 |
| High Temperature | 13 |
| Low Temperature | 6 |
| Sunshine Per Day | 4 |
Useful Links: Biarritz Weather: Average Weather & Yearly Climate