The San Marino resorts with the warmest sea water temperature in September are Acquaviva, Borgo Maggiore and Chiesanuova.
Below you can see a list of all popular San Marino resorts and information about sea water temperature in September for the last two years.
| Resort Name | September 2025 | September 2024 | September 2023 |
|---|---|---|---|
| Acquaviva | 77.9°F | 78.4°F | 78.2°F |
| Borgo Maggiore | 77.9°F | 78.4°F | 78.2°F |
| Chiesanuova | 77.9°F | 78.4°F | 78.2°F |
| Serravalle | 77.9°F | 78.4°F | 78.2°F |
| Domagnano | 77.9°F | 78.4°F | 78.1°F |
| Mentegiardino | 77.9°F | 78.4°F | 78.1°F |
| San Marino | 77.9°F | 78.4°F | 78.1°F |
| Faetano | 77.9°F | 78.4°F | 78.1°F |
| Fiorentino | 77.9°F | 78.4°F | 78.1°F |
Please see following sea water temperature averages charts for the warmest San Marino resorts in September.
You can also get the same information for the every other month of the year when the average sea water temperature is greater then 70°F.
San Marino Resorts:
NAME
F°
| Acquaviva |  |
+50 |
| Borgo Maggiore | |
+50 |
| Chiesanuova | |
+50 |
| Domagnano | |
+50 |
| Faetano | |
+50 |
| Fiorentino | |
+50 |
| Mentegiardino | |
+50 |
| San Marino | |
+50 |
| Serravalle | |
+50 |
