Average daily temperature in San Luis Obispo right-through December is 10. Highs are around 18 and lows being 5 celsius. We have put some more information here:
| Month | Degrees Celsius |
|---|---|
| Temperature | 10 |
| High Temperature | 18 |
| Low Temperature | 5 |
Useful Links: San Luis Obispo Weather: Average Weather & Yearly Climate