Normally average temperatures in Sesimbra right through December is 10. Highs are expected to be 15 with lows around 8 celsius. We have put some more information here:
| Month | Degrees Celsius |
|---|---|
| Temperature | 10 |
| High Temperature | 15 |
| Low Temperature | 8 |
| Sunshine Per Day | 5 |
Useful Links: Sesimbra Weather: Average Weather & Yearly Climate