More often than not the weather in Trieste in December is 5, with highs being around 8 and low average expected to be 5 degrees. With the details being further below:
| Month | Degrees Celsius |
|---|---|
| Temperature | 5 |
| High Temperature | 8 |
| Low Temperature | 5 |
| Sunshine Per Day | 4 |
Useful Links: Trieste Weather: Average Weather & Yearly Climate