NOAA SATELLITE DATA (1991–2020 30-YEAR CLIMATOLOGY)

Finland Sea Temperature in October

Historical 30-year sea surface temperatures across 5 coastlines in Finland for October. 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.

9.3°C

Bracing / Crispaverage across 5 surveyed coastlines in Finland, October

Ranges 7.6°C at Nallikari Beach to 10.8°C at Plagen Beach.
No coastline in Finland reaches 21°C in any month — this is wetsuit or cold-water swimming.
7.2°C cooler than Finland’s August peak of 16.6°C (see August).

Select Month

View 12-Month Annual Overview →

Jan Feb Mar Apr MayPrime JunPrime JulPrime AugPrime SepPrime OctPrime NovPrime Dec

The October 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 October, 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)

24.5°C

Effortless swimming

TURKEY (ANTALYA / KAŞ)

24.8°C

Warm bathwater

GREECE (CRETE / RHODES)

23.4°C

Extended season

MALTA & GOZO

23.2°C

Crystal clear