Month-specific sea-surface temperature · Italy
Sardinia Sea Temperature in September
23.8°C
74.8°F
In September, sea-surface temperature near Sardinia has a historical monthly average of 23.8°C. This is not the reading for any particular holiday date.
Across 2022–2025, the lowest and highest yearly September monthly means were 23.5–24.2°C. These are not daily extremes.
Previous month
August · 26.1°C
Change into September: -2.3°C
Next month
October · 21.9°C
Change into next month: -1.9°C
Can you swim or snorkel in Sardinia in September?
At 23.8°C our temperature-only guide describes the water as mild water. Comfort depends on your cold tolerance, immersion time and wind. A historical average cannot determine whether conditions are safe on any given day.
Do you need a wetsuit?
A rash guard is useful; cold-sensitive snorkelers may prefer a shorty wetsuit.
Which beach should you choose?
Look for a beach sheltered from the actual forecast waves and wind on your visit. Exposure, currents and entry conditions vary even where water temperatures are similar. Follow local warnings.
Sardinia has both sheltered coves and open coast. Use the monthly profile as an island guide, then check the exact beach forecast because wind and waves can change the feel of the water.
Check the current waves, wind and snorkeling forecast →
A live forecast does not predict a future September. Check again close to your trip.
Data source and limitations
Source: Open-Meteo Marine API, MeteoFrance sea-surface temperature; 2022–2025. Marine model grid near 41.12, 9.52. Based on 3 yearly monthly means and 2160 recorded samples. Source methodology.
Modelled sea-surface temperatures do not establish underwater visibility, wildlife, calm currents or safe entry.