Mljet Sea Temperature
Updated Sat 19:20 (Europe/Zagreb)
Croatia · Forecast updated Aug 8, 2026, 19:20 UTC
Current Sea Temperature
28.2°C
82.8°F
Very warm water
Versus this month's average
0.4°C above
The August average in our archive is 27.8°C (82.0°F).
Recent trend
Warming by 1.9°C
Seven-day average: 27.9°C, versus 26.0°C in the prior seven days.
What to wear
Very warm water
Swimwear is usually enough; a rash guard adds sun protection.
Cold tolerance varies. Wind, session length, sunshine, and exertion also affect comfort; temperature alone does not describe sea conditions.
Sea Surface Temperature Over the Year
In the data collected for Mljet, monthly averages range from about 24.3°C (75.7°F) in June to 27.8°C (82.0°F) in August.
Over the past 30 days, the average sea temperature in Mljet has been 26.6°C.
Monthly Water Temperature Averages
| Month | Min | Average | Max |
|---|---|---|---|
| June | 21.0°C / 69.8°F | 24.3°C / 75.7°F | 27.9°C / 82.2°F |
| July | 24.8°C / 76.6°F | 26.2°C / 79.1°F | 28.3°C / 82.9°F |
| August | 26.3°C / 79.3°F | 27.8°C / 82.0°F | 28.8°C / 83.8°F |
Profile calculated from 1660 hourly forecast records across 3 monthly periods. This is a growing archive, not a long-term climate normal.
About the water at Mljet
Forested national-park island with saltwater lakes and clear sheltered bays.
- Area
- Dubrovnik-Neretva
Mljet Water Temperature: Common Questions
What is the sea temperature in Mljet today?
The current sea surface temperature in Mljet is 28.2°C. Over the last 30 days, the average has been 26.6°C.
When is the water warmest in Mljet?
The warmest monthly average in the Mljet archive is August, at around 27.8°C (82.0°F).
When is the water coldest in Mljet?
The coldest monthly average in the archive is June, at around 24.3°C (75.7°F).
Can you swim in Mljet today?
At 28.2°C, the water is usually comfortable for swimming and snorkeling.
Full Snorkeling Forecast
See how today's sea temperature, wave height, wind, and tides combine into a detailed snorkeling score for Mljet.
View Snorkel Forecast →