#1 in September
26.2°C
NOAA Season Curve (May–Oct):
M
19.8°
J
22.7°
J
25.4°
A
27.1°
S
26.2°
O
24.0°
N
21.4°
NOAA SATELLITE DATA (1991–2020 30-YEAR CLIMATOLOGY)
GRGreece Sea Temperature in September
Historical 30-year sea surface temperatures across 67 coastlines in Greece 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.
Bathing Climatology Gauge · Greece (September)
NOAA OISST v2.1 (0.25° Marine Grid)
24.4°C
Pleasant & Comfortable
Mean sea surface temperature across 67 monitored coastlines
Swimmability Verdict
Effortless Prolonged Bathing
Warmest Coastline
26.2°C
Coldest Surveyed Shore
23.0°C
Swimmable Ratio (≥21°C)
100% of surveyed coasts67/67
Greece’s primary swimming window runs from 3 Jun to 29 Oct (~148 days/year). Currently 1.0°C below the August peak of 25.4°C. High ocean specific heat capacity creates distinct thermal lag: water releases stored summer warmth gradually, making early autumn bathing warmer than late spring despite cooler evening air.
Plan Your September Trip to Greece
Autumn shoulder-season rates are currently live across Greece. Pair warm coastal waters with discounted stays and uncrowded beaches.
Warmest Swimming Bases in Greece (September)
The top 3 coastlines holding highest water temperatures based on 30-year NOAA climatology.
Select Month
View 12-Month Annual Overview →Aegean Meltemi Winds vs Deep Ionian & Cretan Basins
In the Aegean Sea, strong dry northerly winds (the Meltemi) in July and August induce localized vertical water mixing and localized upwelling, keeping surface temperatures around 24–25°C despite scorching ambient air temperatures. In contrast, the sheltered southern Ionian and southern Crete reach 26.3–26.8°C.
Oceanographic Phenomenon:Meltemi Wind Mixing & Southern Solar Radiation
Thermal Lag Characteristic:Strong eastern Mediterranean thermal lag: October waters across Rhodes and Crete remain remarkably mild (22.8–23.5°C), warmer than early June (21.5°C).
Peak Bathing Average:August (26.3°C)
Statutory Tourism Sources:
chaniatourism.grvisit.corfu.grvisitgreece.grvisitkefaloniaisland.grmilos.grThe 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
Greece Beaches in September
Individual coordinate lookups from NOAA 0.25° marine grid.
Showing 67 coastlines
Explore Sea Temperatures by Country
Spain(23.7°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)
