Generally, average daily wearther in Costa Brava in December is 6. Throughout the month you should see a high of 13 with low daily temperautes being 3. The table below has further info:
| Month | Degrees Celsius |
|---|---|
| Temperature | 6 |
| High Temperature | 13 |
| Low Temperature | 3 |
| Sunshine Per Day | 5 |
Useful Links: Costa Brava Weather: Average Weather & Yearly Climate