Hermitage Lagoon Water Temperature
Updated Sat 13:16 (Indian/Reunion)
Réunion · Forecast updated Sep 26, 2026, 13:16 UTC
Current Sea Temperature
24.9°C
76.8°F
Mild water
Valid Sep 26, 2026, 13:16 (Indian/Reunion). Source: stored Open-Meteo marine forecast. Temperature is not a safety rating or snorkel score.
Versus this month's average
0.3°C above
The typical September average is 24.6°C (76.3°F) from the historical baseline.
Recent trend
Warming by 0.3°C
Seven-day average: 24.8°C, versus 24.4°C in the prior seven days.
What to wear
Mild water
A rash guard is useful; cold-sensitive snorkelers may prefer a shorty wetsuit.
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 Hermitage Lagoon, typical monthly averages range from about 24.4°C (75.9°F) in August to 28.5°C (83.3°F) in March.
Over the past 30 days, the average sea temperature in Hermitage Lagoon has been 24.8°C.
Historical baseline (full year)
Southern Hemisphere. Summer is generally December–February; winter is June–August.
Typical monthly sea-surface temperature near Hermitage Lagoon, calculated from hourly observations for 2023–2025. This is not this site's forecast archive.
| Month | Typical range | Average |
|---|---|---|
| January | 27.9–28.7°C | 28.2°C / 82.8°F |
| February | 28.1–28.5°C | 28.3°C / 82.9°F |
| March | 28.0–29.2°C | 28.5°C / 83.3°F |
| April | 27.6–28.6°C | 28.0°C / 82.4°F |
| May | 26.6–27.2°C | 27.0°C / 80.6°F |
| June | 25.0–26.3°C | 25.7°C / 78.3°F |
| July | 24.8–24.9°C | 24.9°C / 76.8°F |
| August | 24.0–24.8°C | 24.4°C / 75.9°F |
| September | 24.1–25.0°C | 24.6°C / 76.3°F |
| October | 24.9–25.6°C | 25.2°C / 77.4°F |
| November | 26.3–26.6°C | 26.5°C / 79.7°F |
| December | 27.3–28.0°C | 27.6°C / 81.7°F |
Source: Open-Meteo Marine API, MeteoFrance sea-surface temperature dataset. Nearest sea grid cell (-21.04, 55.21). 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 2023–2025 baseline. The range is the lowest and highest yearly monthly mean, not an hourly extreme.
Hermitage Lagoon in January
Typical January water temperature near Hermitage Lagoon is 28.2°C (82.8°F), with yearly monthly means from 27.9–28.7°C.
Hermitage Lagoon in February
Typical February water temperature near Hermitage Lagoon is 28.3°C (82.9°F), with yearly monthly means from 28.1–28.5°C.
Hermitage Lagoon in March
Typical March water temperature near Hermitage Lagoon is 28.5°C (83.3°F), with yearly monthly means from 28.0–29.2°C.
Hermitage Lagoon in April
Typical April water temperature near Hermitage Lagoon is 28.0°C (82.4°F), with yearly monthly means from 27.6–28.6°C.
Hermitage Lagoon in May
Typical May water temperature near Hermitage Lagoon is 27.0°C (80.6°F), with yearly monthly means from 26.6–27.2°C.
Hermitage Lagoon in June
Typical June water temperature near Hermitage Lagoon is 25.7°C (78.3°F), with yearly monthly means from 25.0–26.3°C.
Hermitage Lagoon in July
Typical July water temperature near Hermitage Lagoon is 24.9°C (76.8°F), with yearly monthly means from 24.8–24.9°C.
Hermitage Lagoon in August
Typical August water temperature near Hermitage Lagoon is 24.4°C (75.9°F), with yearly monthly means from 24.0–24.8°C.
Hermitage Lagoon in September
Typical September water temperature near Hermitage Lagoon is 24.6°C (76.3°F), with yearly monthly means from 24.1–25.0°C.
Hermitage Lagoon in October
Typical October water temperature near Hermitage Lagoon is 25.2°C (77.4°F), with yearly monthly means from 24.9–25.6°C.
Hermitage Lagoon in November
Typical November water temperature near Hermitage Lagoon is 26.5°C (79.7°F), with yearly monthly means from 26.3–26.6°C.
Hermitage Lagoon in December
Typical December water temperature near Hermitage Lagoon is 27.6°C (81.7°F), with yearly monthly means from 27.3–28.0°C.
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 | 25.2°C / 77.4°F | 26.0°C / 78.9°F | 26.9°C / 80.4°F |
| July | 24.6°C / 76.3°F | 25.0°C / 77.0°F | 25.4°C / 77.7°F |
| August | 24.8°C / 76.6°F | 25.2°C / 77.3°F | 25.7°C / 78.3°F |
| September | 24.2°C / 75.6°F | 24.7°C / 76.5°F | 25.6°C / 78.1°F |
Partial coverage: 4 calendar months with records. Profile calculated from 2830 hourly forecast records across 4 monthly periods. This is a growing archive, not a long-term climate normal.
About the water at Hermitage Lagoon
Protected west-coast lagoon with shallow coral and reef fish.
- Area
- Réunion
Hermitage Lagoon Water Temperature: Common Questions
What is the water temperature in Hermitage Lagoon today?
The current sea surface temperature near Hermitage Lagoon is 24.9°C (76.8°F). Over the last 30 days, the average has been 24.8°C.
When is the water warmest in Hermitage Lagoon?
The water is typically warmest in March, at around 28.5°C (83.3°F) in the 2023–2025 historical baseline.
When is the water coldest in Hermitage Lagoon?
The water is typically coldest in August, at around 24.4°C (75.9°F) in the same historical baseline.
Can you swim in Hermitage Lagoon today?
At 24.9°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 Hermitage Lagoon.
View Snorkel Forecast →