Mljet Sea Temperature
Croatia · Forecast updated Jul 15, 2026, 06:22 UTC · refresh delayed
Current Sea Temperature
25.5°C
77.9°F
Warm water
Versus this month's average
0.5°C below
The July average in our archive is 26.0°C (78.8°F).
Recent trend
Holding fairly steady
Seven-day average: 25.8°C, versus 25.8°C in the prior seven days.
What to wear
Warm water
Most people are comfortable in swimwear or a light rash guard.
Cold tolerance varies. Wind, session length, sunshine, and exertion also affect comfort; temperature alone does not mean the sea is safe.
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 26.0°C (78.8°F) in July.
Over the past 30 days, the average sea temperature in Mljet has been 25.7°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 | 26.0°C / 78.8°F | 28.2°C / 82.8°F |
Profile calculated from 1071 hourly forecast records across 2 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 25.5°C. Over the last 30 days, the average has been 25.7°C.
When is the water warmest in Mljet?
The warmest monthly average in the Mljet archive is July, at around 26.0°C (78.8°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?
Yes — at 25.5°C the water is warm enough for comfortable 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 →