#1 in September
25.8°C
NOAA Season Curve (May–Oct):
M
18.3°
J
21.8°
J
24.9°
A
26.5°
S
25.8°
O
23.8°
N
20.8°
NOAA SATELLITE DATA (1991–2020 30-YEAR CLIMATOLOGY)
ITItaly Sea Temperature in September
Historical 30-year sea surface temperatures across 60 coastlines in Italy for September. Derived from NOAA 0.25° blended satellite and in-situ marine observations.
Climatology Notice: Temperatures represent the 30-year long-term historical average (1991–2020 normal), not a live single-day sensor forecast.
24.1°C
Pleasant & Comfortableaverage across 60 surveyed coastlines in Italy, September
- Ranges 22.6°C at Lido di Venezia to 25.8°C at Spiaggia dei Conigli.
- All 60 surveyed coastlines are at or above the 21°C swim threshold.
- On the national average, the water is above 21°C from 6 Jun to 19 Oct — about 135 days a year.
- 1.8°C cooler than Italy’s August peak of 25.9°C (see August).
Select Month
View 12-Month Annual Overview →Tyrrhenian Sea Depth vs Northern Adriatic Shelf
The deep Tyrrhenian Sea surrounding Sardinia and western Italy forms a warm solar collector averaging 25.5–26.2°C in August. In contrast, the northern Venetian lagoon and upper Adriatic experience rapid seasonal heating and cooling over shallow sea beds.
Oceanographic Phenomenon:Deep Basin Solar Storage & Alpine Shelter
Thermal Lag Characteristic:Pronounced southern thermal lag: Sicily and Sardinia maintain 22.5–23.5°C water temperatures throughout October.
Peak Bathing Average:August (26.0°C)
Statutory Tourism Sources:
italia.itprenotazionespiaggiaconigli.itcalabriastraordinaria.itvisitsicily.infovendicari.netThe September Thermal Lag Advantage
Because seawater has a high specific heat capacity, it acts as a massive thermal battery. Southern European and Mediterranean basins absorb solar energy all summer, reaching maximum heat storage by late August. In September, while air temperatures drop, the water releases heat slowly, which creates sea temperatures that are typically 3°C to 5°C warmer than in June.
CYPRUS (AYIA NAPA / PROTARAS)
27.5°C
Effortless swimming
TURKEY (ANTALYA / KAŞ)
27.3°C
Warm bathwater
GREECE (CRETE / RHODES)
25.4°C
Extended season
MALTA & GOZO
26.1°C
Crystal clear
Italy Beaches in September
Individual coordinate lookups from NOAA 0.25° marine grid.
Showing 60 coastlines
Explore Sea Temperatures by Country
Spain(23.6°C)Italy(25.9°C)Turkey(27.3°C)France(22.4°C)Greece(25.4°C)Cyprus(27.7°C)Croatia(25.2°C)Albania(25.5°C)Montenegro(25.7°C)Malta(26.7°C)Bulgaria(25.1°C)Romania(24.7°C)Slovenia(25.4°C)Portugal(20.7°C)Poland(19°C)Sweden(18.3°C)Netherlands(18.5°C)Bosnia & Herzegovina(25.2°C)Monaco(24.6°C)Latvia(18.5°C)Estonia(18°C)Lithuania(18.8°C)Germany(18.6°C)Denmark(18°C)Norway(15.3°C)Belgium(18.7°C)Faroe Islands(10.9°C)United Kingdom(16.1°C)Ireland(15.9°C)Iceland(10.9°C)Finland(16.6°C)
