Month-specific sea-surface temperature · Croatia
Mljet Sea Temperature in June
23.7°C
74.7°F
In June, sea-surface temperature near Mljet has a historical monthly average of 23.7°C. This is not the reading for any particular holiday date.
Across 2023–2025, the lowest and highest yearly June monthly means were 23.2–24.3°C. These are not daily extremes.
Previous month
May · 19.0°C
Change into June: +4.7°C
Next month
July · 25.9°C
Change into next month: +2.2°C
Can you swim or snorkel in Mljet in June?
At 23.7°C our temperature-only guide describes the water as mild 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 rash guard is useful; cold-sensitive snorkelers may prefer a shorty wetsuit.
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 June. Check again close to your trip.
Nearby places in June
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.