Sea temperature in Croatia in September
average across 6 DHMZ stations, 1996-2025 - station averages run from 22.3 to 23.3 °C
| Station | Average | Coldest year | Warmest year | Record low | Record high |
|---|---|---|---|---|---|
| Rovinj-Sv.Ivan n/p | 23.0 °C | 21.4 °C (1996) | 24.9 °C (2011) | 19.2 °C | 27.0 °C |
| Pula | 23.2 °C | 21.3 °C (2010) | 25.0 °C (2023) | 2.0 °C | 27.7 °C |
| Rab | 22.3 °C | 19.9 °C (1996) | 24.7 °C (2011) | 18.1 °C | 27.0 °C |
| Šibenik | 22.7 °C | 20.5 °C (2007) | 24.5 °C (2011) | 16.0 °C | 27.0 °C |
| Split | 22.8 °C | 20.2 °C (2007) | 24.7 °C (2011) | 18.0 °C | 27.3 °C |
| Hvar | 23.3 °C | 21.1 °C (2007) | 25.0 °C (2011) | 19.5 °C | 26.7 °C |
At these stations in September the sea averaged 22.4 °C in 1996-2005 and 23.4 °C in 2016-2025 - 1.0 °C warmer.
These are the readings as the instruments recorded them, not a homogenised climate series: station moves and instrument changes are not corrected for.
← August · Sea temperature in Croatia by month · October →
How this is measured
Daily sea-surface observations at the 14:00 term, averaged over 1996-2025. A station appears here only when at least 20 of those years carry a full month of readings; stations with a shorter series are left out rather than averaged into a normal they cannot support. The Croatia-wide figure is the unweighted mean of the stations shown, not a coastline average.
Source: DHMZ — Državni hidrometeorološki zavod, archive data supplied on request. https://meteo.hr/