Normally the average weather in San Sebastian through the month of December is 8. Average high is typically 13 and average daily low being 6 celsius. The table below includes more detail:
| Month | Degrees Celsius |
|---|---|
| Temperature | 8 |
| High Temperature | 13 |
| Low Temperature | 6 |
| Sunshine Per Day | 4 |
Useful Links: San Sebastian Weather: Average Weather & Yearly Climate