INSTRUMENT / SEA TEMPERATURE
Nosy Be Water Temperature
Updated Mon 13:50 (Indian/Antananarivo)
Madagascar · Forecast updated Nov 9, 2026, 13:50 UTC
Current Sea Temperature
30.5°C
86.9°F
Very warm water
Valid Nov 9, 2026, 13:50 (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 November average is 30.5°C (86.9°F) from the historical baseline.
Recent trend
Holding fairly steady
Seven-day average: 30.0°C, versus 29.8°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 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 29.3°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.
Swimming and snorkeling: very warm water. Swimwear is usually enough; a rash guard adds sun protection.
Adjacent months: December 31.2°C · February 30.9°C.
Explore Nosy Be sea temperature in January, including swim comfort and month comparisons →
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.
Swimming and snorkeling: very warm water. Swimwear is usually enough; a rash guard adds sun protection.
Adjacent months: January 30.5°C · March 31.3°C.
Explore Nosy Be sea temperature in February, including swim comfort and month comparisons →
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.
Swimming and snorkeling: very warm water. Swimwear is usually enough; a rash guard adds sun protection.
Adjacent months: February 30.9°C · April 31.6°C.
Explore Nosy Be sea temperature in March, including swim comfort and month comparisons →
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.
Swimming and snorkeling: very warm water. Swimwear is usually enough; a rash guard adds sun protection.
Adjacent months: March 31.3°C · May 30.6°C.
Explore Nosy Be sea temperature in April, including swim comfort and month comparisons →
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.
Swimming and snorkeling: very warm water. Swimwear is usually enough; a rash guard adds sun protection.
Adjacent months: April 31.6°C · June 28.7°C.
Explore Nosy Be sea temperature in May, including swim comfort and month comparisons →
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.
Swimming and snorkeling: very warm water. Swimwear is usually enough; a rash guard adds sun protection.
Adjacent months: May 30.6°C · July 27.6°C.
Explore Nosy Be sea temperature in June, including swim comfort and month comparisons →
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.
Swimming and snorkeling: warm water. Most people are comfortable in swimwear or a light rash guard.
Adjacent months: June 28.7°C · August 27.4°C.
Explore Nosy Be sea temperature in July, including swim comfort and month comparisons →
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.
Swimming and snorkeling: warm water. Most people are comfortable in swimwear or a light rash guard.
Adjacent months: July 27.6°C · September 27.7°C.
Explore Nosy Be sea temperature in August, including swim comfort and month comparisons →
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.
Swimming and snorkeling: warm water. Most people are comfortable in swimwear or a light rash guard.
Adjacent months: August 27.4°C · October 28.9°C.
Explore Nosy Be sea temperature in September, including swim comfort and month comparisons →
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.
Swimming and snorkeling: very warm water. Swimwear is usually enough; a rash guard adds sun protection.
Adjacent months: September 27.7°C · November 30.5°C.
Explore Nosy Be sea temperature in October, including swim comfort and month comparisons →
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.
Swimming and snorkeling: very warm water. Swimwear is usually enough; a rash guard adds sun protection.
Adjacent months: October 28.9°C · December 31.2°C.
Explore Nosy Be sea temperature in November, including swim comfort and month comparisons →
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.
Swimming and snorkeling: very warm water. Swimwear is usually enough; a rash guard adds sun protection.
Adjacent months: November 30.5°C · January 30.5°C.
Explore Nosy Be 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 | 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 |
| October | 27.8°C / 82.0°F | 28.8°C / 83.9°F | 30.3°C / 86.5°F |
| November | 29.2°C / 84.6°F | 29.9°C / 85.8°F | 30.7°C / 87.3°F |
Partial coverage: 6 calendar months with records. Profile calculated from 3886 hourly forecast records across 6 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 30.5°C (86.9°F). Over the last 30 days, the average has been 29.3°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 30.5°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 →