Nosy Be Water Temperature
Updated Fri 08:30 (Indian/Antananarivo)
Madagascar · Forecast updated Sep 25, 2026, 08:30 UTC
Current Sea Temperature
27.8°C
82.0°F
Warm water
Valid Sep 25, 2026, 08:30 (Indian/Antananarivo). 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 September average is 27.7°C (81.9°F) from the historical baseline.
Recent trend
Holding fairly steady
Seven-day average: 27.7°C, versus 27.7°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 describe sea conditions or replace the snorkel forecast.
Typical Sea Temperature Over the Year
In the historical baseline for Nosy Be, typical monthly averages range from about 27.4°C (81.3°F) in August to 31.6°C (88.9°F) in April.
Over the past 30 days, the average sea temperature in Nosy Be has been 27.8°C.
Historical baseline (full year)
Southern Hemisphere. Summer is generally December–February; winter is June–August.
Typical monthly sea-surface temperature near Nosy Be, calculated from hourly observations for 2023–2025. This is not this site's forecast archive.
| Month | Typical range | Average |
|---|---|---|
| January | 30.0–31.1°C | 30.5°C / 86.9°F |
| February | 30.9–30.9°C | 30.9°C / 87.6°F |
| March | 31.1–31.7°C | 31.3°C / 88.3°F |
| April | 31.3–31.9°C | 31.6°C / 88.9°F |
| May | 30.2–31.2°C | 30.6°C / 87.1°F |
| June | 28.5–28.8°C | 28.7°C / 83.7°F |
| July | 27.4–27.7°C | 27.6°C / 81.7°F |
| August | 27.0–27.9°C | 27.4°C / 81.3°F |
| September | 27.3–28.0°C | 27.7°C / 81.9°F |
| October | 28.7–29.2°C | 28.9°C / 84.0°F |
| November | 30.0–30.9°C | 30.5°C / 86.9°F |
| December | 30.7–31.7°C | 31.2°C / 88.2°F |
Source: Open-Meteo Marine API, MeteoFrance sea-surface temperature dataset. Nearest sea grid cell (-13.29, 48.21). 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.
Nosy Be in January
Typical January water temperature near Nosy Be is 30.5°C (86.9°F), with yearly monthly means from 30.0–31.1°C.
Nosy Be in February
Typical February water temperature near Nosy Be is 30.9°C (87.6°F), with yearly monthly means from 30.9–30.9°C.
Nosy Be in March
Typical March water temperature near Nosy Be is 31.3°C (88.3°F), with yearly monthly means from 31.1–31.7°C.
Nosy Be in April
Typical April water temperature near Nosy Be is 31.6°C (88.9°F), with yearly monthly means from 31.3–31.9°C.
Nosy Be in May
Typical May water temperature near Nosy Be is 30.6°C (87.1°F), with yearly monthly means from 30.2–31.2°C.
Nosy Be in June
Typical June water temperature near Nosy Be is 28.7°C (83.7°F), with yearly monthly means from 28.5–28.8°C.
Nosy Be in July
Typical July water temperature near Nosy Be is 27.6°C (81.7°F), with yearly monthly means from 27.4–27.7°C.
Nosy Be in August
Typical August water temperature near Nosy Be is 27.4°C (81.3°F), with yearly monthly means from 27.0–27.9°C.
Nosy Be in September
Typical September water temperature near Nosy Be is 27.7°C (81.9°F), with yearly monthly means from 27.3–28.0°C.
Nosy Be in October
Typical October water temperature near Nosy Be is 28.9°C (84.0°F), with yearly monthly means from 28.7–29.2°C.
Nosy Be in November
Typical November water temperature near Nosy Be is 30.5°C (86.9°F), with yearly monthly means from 30.0–30.9°C.
Nosy Be in December
Typical December water temperature near Nosy Be is 31.2°C (88.2°F), with yearly monthly means from 30.7–31.7°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 | 27.8°C / 82.0°F | 28.7°C / 83.7°F | 29.7°C / 85.5°F |
| July | 27.3°C / 81.1°F | 27.7°C / 81.8°F | 28.1°C / 82.6°F |
| August | 27.2°C / 81.0°F | 27.9°C / 82.2°F | 28.4°C / 83.1°F |
| September | 27.3°C / 81.1°F | 27.8°C / 82.1°F | 28.6°C / 83.5°F |
Partial coverage: 4 calendar months with records. Profile calculated from 2801 hourly forecast records across 4 monthly periods. This is a growing archive, not a long-term climate normal.
About the water at Nosy Be
Northwest island with reef, turtles and seasonal whale sharks in clear water.
- Area
- Diana
Nosy Be Water Temperature: Common Questions
What is the water temperature in Nosy Be today?
The current sea surface temperature near Nosy Be is 27.8°C (82.0°F). Over the last 30 days, the average has been 27.8°C.
When is the water warmest in Nosy Be?
The water is typically warmest in April, at around 31.6°C (88.9°F) in the 2023–2025 historical baseline.
When is the water coldest in Nosy Be?
The water is typically coldest in August, at around 27.4°C (81.3°F) in the same historical baseline.
Can you swim in Nosy Be today?
At 27.8°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 Nosy Be.
View Snorkel Forecast →