Month-specific sea-surface temperature · Croatia
Mljet Sea Temperature in November
19.4°C
66.9°F
In November, sea-surface temperature near Mljet has a historical monthly average of 19.4°C. This is not the reading for any particular holiday date.
Across 2023–2025, the lowest and highest yearly November monthly means were 18.4–20.6°C. These are not daily extremes.
Previous month
October · 22.0°C
Change into November: -2.6°C
Next month
December · 17.1°C
Change into next month: -2.3°C
Can you swim or snorkel in Mljet in November?
At 19.4°C our temperature-only guide describes the water as cool water. Comfort depends on your cold tolerance, immersion time and wind. A historical average cannot determine whether conditions are safe on any given day.
Do you need a wetsuit?
A 3 mm shorty or full wetsuit will make longer snorkels more comfortable.
Which beach should you choose?
Look for a beach sheltered from the actual forecast waves and wind on your visit. Exposure, currents and entry conditions vary even where water temperatures are similar. Follow local warnings.
Check the current waves, wind and snorkeling forecast →
A live forecast does not predict a future November. Check again close to your trip.
Nearby places in November
Comparable historical averages from independent marine grid cells. Warmer water does not imply safe snorkeling.
Data source and limitations
Source: Open-Meteo Marine API, MeteoFrance sea-surface temperature; 2023–2025. Marine model grid near 42.75, 17.53. Based on 3 yearly monthly means and 2160 recorded samples. Source methodology.
Modelled sea-surface temperatures do not establish underwater visibility, wildlife, calm currents or safe entry.