INSTRUMENT / SEA TEMPERATURE
Mljet Water Temperature
Updated Sat 14:59 (Europe/Zagreb)
Croatia · Forecast updated Nov 7, 2026, 14:59 UTC
Current Sea Temperature
19.4°C
66.9°F
Cool water
Valid Nov 7, 2026, 14:59 (Europe/Zagreb). Source: stored Open-Meteo marine forecast. Temperature is not a safety rating or snorkel score.
Versus this month's average
Close to average
The typical November average is 19.4°C (66.9°F) from the historical baseline.
Recent trend
Cooling by 1.1°C
Seven-day average: 19.6°C, versus 20.7°C in the prior seven days.
What to wear
Cool water
A 3 mm shorty or full wetsuit will make longer snorkels more comfortable.
Cold tolerance varies. Wind, session length, sunshine, and exertion also affect comfort; temperature alone does not describe sea conditions or replace the snorkel forecast.
Typical Sea Temperature Over the Year
In the historical baseline for Mljet, typical monthly averages range from about 14.8°C (58.6°F) in February to 26.2°C (79.2°F) in August.
Over the past 30 days, the average sea temperature in Mljet has been 20.9°C.
Historical baseline (full year)
Northern Hemisphere. Summer is generally June–August; winter is December–February.
Typical monthly sea-surface temperature near Mljet, calculated from hourly observations for 2022–2025. This is not this site's forecast archive.
| Month | Typical range | Average |
|---|---|---|
| January | 15.2–16.1°C | 15.7°C / 60.3°F |
| February | 14.6–15.0°C | 14.8°C / 58.6°F |
| March | 14.6–15.6°C | 15.2°C / 59.4°F |
| April | 15.6–17.1°C | 16.3°C / 61.3°F |
| May | 18.5–19.4°C | 19.0°C / 66.2°F |
| June | 23.2–24.3°C | 23.7°C / 74.7°F |
| July | 25.2–26.3°C | 25.9°C / 78.6°F |
| August | 25.5–27.0°C | 26.2°C / 79.2°F |
| September | 24.4–25.7°C | 25.0°C / 77.0°F |
| October | 20.6–23.2°C | 22.0°C / 71.6°F |
| November | 18.4–20.6°C | 19.4°C / 66.9°F |
| December | 16.9–17.2°C | 17.1°C / 62.8°F |
Source: Open-Meteo Marine API, MeteoFrance sea-surface temperature dataset. Nearest sea grid cell (42.79, 17.54). Each month is the mean of yearly monthly means; the range is the lowest and highest of those yearly monthly means. Open-Meteo methodology.
Water temperature by month
Each month uses the 2022–2025 baseline. The range is the lowest and highest yearly monthly mean, not an hourly extreme.
Mljet in January
Typical January water temperature near Mljet is 15.7°C (60.3°F), with yearly monthly means from 15.2–16.1°C.
Swimming and snorkeling: cold water. Use a full 3-5 mm wetsuit and keep the session within your cold-water experience.
Adjacent months: December 17.1°C · February 14.8°C.
Explore Mljet sea temperature in January, including swim comfort and month comparisons →
Mljet in February
Typical February water temperature near Mljet is 14.8°C (58.6°F), with yearly monthly means from 14.6–15.0°C.
Swimming and snorkeling: cold water. Use a full 3-5 mm wetsuit and keep the session within your cold-water experience.
Adjacent months: January 15.7°C · March 15.2°C.
Explore Mljet sea temperature in February, including swim comfort and month comparisons →
Mljet in March
Typical March water temperature near Mljet is 15.2°C (59.4°F), with yearly monthly means from 14.6–15.6°C.
Swimming and snorkeling: cold water. Use a full 3-5 mm wetsuit and keep the session within your cold-water experience.
Adjacent months: February 14.8°C · April 16.3°C.
Explore Mljet sea temperature in March, including swim comfort and month comparisons →
Mljet in April
Typical April water temperature near Mljet is 16.3°C (61.3°F), with yearly monthly means from 15.6–17.1°C.
Swimming and snorkeling: cold water. Use a full 3-5 mm wetsuit and keep the session within your cold-water experience.
Adjacent months: March 15.2°C · May 19.0°C.
Explore Mljet sea temperature in April, including swim comfort and month comparisons →
Mljet in May
Typical May water temperature near Mljet is 19.0°C (66.2°F), with yearly monthly means from 18.5–19.4°C.
Swimming and snorkeling: cool water. A 3 mm shorty or full wetsuit will make longer snorkels more comfortable.
Adjacent months: April 16.3°C · June 23.7°C.
Explore Mljet sea temperature in May, including swim comfort and month comparisons →
Mljet in June
Typical June water temperature near Mljet is 23.7°C (74.7°F), with yearly monthly means from 23.2–24.3°C.
Swimming and snorkeling: mild water. A rash guard is useful; cold-sensitive snorkelers may prefer a shorty wetsuit.
Adjacent months: May 19.0°C · July 25.9°C.
Explore Mljet sea temperature in June, including swim comfort and month comparisons →
Mljet in July
Typical July water temperature near Mljet is 25.9°C (78.6°F), with yearly monthly means from 25.2–26.3°C.
Swimming and snorkeling: warm water. Most people are comfortable in swimwear or a light rash guard.
Adjacent months: June 23.7°C · August 26.2°C.
Explore Mljet sea temperature in July, including swim comfort and month comparisons →
Mljet in August
Typical August water temperature near Mljet is 26.2°C (79.2°F), with yearly monthly means from 25.5–27.0°C.
Swimming and snorkeling: warm water. Most people are comfortable in swimwear or a light rash guard.
Adjacent months: July 25.9°C · September 25.0°C.
Explore Mljet sea temperature in August, including swim comfort and month comparisons →
Mljet in September
Typical September water temperature near Mljet is 25.0°C (77.0°F), with yearly monthly means from 24.4–25.7°C.
Swimming and snorkeling: warm water. Most people are comfortable in swimwear or a light rash guard.
Adjacent months: August 26.2°C · October 22.0°C.
Explore Mljet sea temperature in September, including swim comfort and month comparisons →
Mljet in October
Typical October water temperature near Mljet is 22.0°C (71.6°F), with yearly monthly means from 20.6–23.2°C.
Swimming and snorkeling: mild water. A rash guard is useful; cold-sensitive snorkelers may prefer a shorty wetsuit.
Adjacent months: September 25.0°C · November 19.4°C.
Explore Mljet sea temperature in October, including swim comfort and month comparisons →
Mljet in November
Typical November water temperature near Mljet is 19.4°C (66.9°F), with yearly monthly means from 18.4–20.6°C.
Swimming and snorkeling: cool water. A 3 mm shorty or full wetsuit will make longer snorkels more comfortable.
Adjacent months: October 22.0°C · December 17.1°C.
Explore Mljet sea temperature in November, including swim comfort and month comparisons →
Mljet in December
Typical December water temperature near Mljet is 17.1°C (62.8°F), with yearly monthly means from 16.9–17.2°C.
Swimming and snorkeling: cold water. Use a full 3-5 mm wetsuit and keep the session within your cold-water experience.
Adjacent months: November 19.4°C · January 15.7°C.
Explore Mljet sea temperature in December, including swim comfort and month comparisons →
Forecast archive (growing)
These values come from hourly forecasts SnorkelForecast has stored. They cover only months with records and do not replace the historical baseline.
| 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 / 82.1°F | 29.3°C / 84.7°F |
| September | 23.9°C / 75.0°F | 26.8°C / 80.3°F | 29.2°C / 84.6°F |
| October | 20.2°C / 68.4°F | 21.7°C / 71.1°F | 24.3°C / 75.7°F |
| November | 19.3°C / 66.7°F | 19.6°C / 67.2°F | 20.2°C / 68.4°F |
Partial coverage: 6 calendar months with records. Profile calculated from 3839 hourly forecast records across 6 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 water temperature in Mljet today?
The current sea surface temperature near Mljet is 19.4°C (66.9°F). Over the last 30 days, the average has been 20.9°C.
When is the water warmest in Mljet?
The water is typically warmest in August, at around 26.2°C (79.2°F) in the 2022–2025 historical baseline.
When is the water coldest in Mljet?
The water is typically coldest in February, at around 14.8°C (58.6°F) in the same historical baseline. A wetsuit is usually recommended during this period.
Can you swim in Mljet today?
The water is 19.4°C. It may feel cool, but a wetsuit or short swims can help.
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 →