Normally the average weather in Arroyo Grande for the duration of December is 10 with a typical high being 18 with low temperatures being around 5. We have put some more information below:
| Month | Degrees Celsius |
|---|---|
| Temperature | 10 |
| High Temperature | 18 |
| Low Temperature | 5 |
Useful Links: Arroyo Grande Weather: Average Weather & Yearly Climate