In December warmest sea in Lazio is usually observed in the following locations: Fiuggi, Porto Santo Stefano, Marina di Grosseto.
Table below shows the average sea water temperature for marine resorts of Lazio in December for the last three years.
| Place name | December 2025 | December 2024 | December 2023 |
|---|---|---|---|
| Fiuggi | 62.7°F | 63.3°F | 63.0°F |
| Porto Santo Stefano | 62.3°F | 62.2°F | 61.9°F |
| Marina di Grosseto | 62.3°F | 61.8°F | 61.7°F |
| Civitavecchia | 62.3°F | 62.2°F | 61.8°F |
| Rome | 62.3°F | 62.5°F | 62.1°F |
| Ostia | 62.2°F | 62.5°F | 62.1°F |
| Santa Marinella | 62.2°F | 62.1°F | 61.8°F |
| Orbetello | 62.2°F | 62.1°F | 61.8°F |
| Fiumicino | 61.8°F | 62.1°F | 61.7°F |
| Francavilla al Mare | 54.4°F | 55.2°F | 55.4°F |
| Pescara | 54.4°F | 55.2°F | 55.4°F |
| Roseto degli Abruzzi | 54.3°F | 54.9°F | 55.2°F |
| Silvi | 54.3°F | 54.9°F | 55.1°F |
| Montesilvano | 54.3°F | 54.9°F | 55.1°F |
Charts below show average sea water temperature for Lazio resorts with the warmest sea in December.
You can also check other months of the year to see sea temperature of Lazio resorts at that time.
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