#1 in September
22.7°C
NOAA Season Curve (May–Oct):
M
15.7°
J
21.2°
J
24.2°
A
25.2°
S
22.7°
O
18.7°
N
14.4°
NOAA SATELLITE DATA (1991–2020 30-YEAR CLIMATOLOGY)
BGBulgaria Sea Temperature in September
Historical 30-year sea surface temperatures across 48 coastlines in Bulgaria 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.
22.5°C
Pleasant & Comfortableaverage across 48 surveyed coastlines in Bulgaria, September
- Ranges 22.0°C at Shabla Lighthouse Beach to 22.7°C at Ahtopol Central Beach.
- All 48 surveyed coastlines are at or above the 21°C swim threshold.
- On the national average, the water is above 21°C from 14 Jun to 26 Sep — about 104 days a year.
- 2.6°C cooler than Bulgaria’s August peak of 25.1°C (see August).
Select Month
View 12-Month Annual Overview →The 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
Bulgaria Beaches in September
Individual coordinate lookups from NOAA 0.25° marine grid.
Showing 48 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)
