Arraial do Cabo Water Temperature
Updated Thu 06:40 (America/Sao_Paulo)
Brazil · Forecast updated Sep 24, 2026, 06:40 UTC
Current Sea Temperature
22.1°C
71.8°F
Mild water
Valid Sep 24, 2026, 06:40 (America/Sao_Paulo). Source: stored Open-Meteo marine forecast. Temperature is not a safety rating or snorkel score.
Versus this month's average
0.4°C above
The typical September average is 21.7°C (71.1°F) from the historical baseline.
Recent trend
Cooling by 0.3°C
Seven-day average: 22.3°C, versus 22.6°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 Arraial do Cabo, typical monthly averages range from about 21.7°C (71.1°F) in September to 25.3°C (77.5°F) in March.
Over the past 30 days, the average sea temperature in Arraial do Cabo has been 22.4°C.
Historical baseline (full year)
Southern Hemisphere. Summer is generally December–February; winter is June–August.
Typical monthly sea-surface temperature near Arraial do Cabo, calculated from hourly observations for 2023–2025. This is not this site's forecast archive.
| Month | Typical range | Average |
|---|---|---|
| January | 22.6–25.4°C | 24.3°C / 75.7°F |
| February | 23.6–26.0°C | 24.8°C / 76.6°F |
| March | 24.8–25.8°C | 25.3°C / 77.5°F |
| April | 24.4–25.1°C | 24.6°C / 76.3°F |
| May | 23.3–23.8°C | 23.6°C / 74.5°F |
| June | 21.7–23.5°C | 22.6°C / 72.7°F |
| July | 21.4–23.0°C | 22.1°C / 71.8°F |
| August | 21.4–22.6°C | 21.8°C / 71.2°F |
| September | 21.2–22.5°C | 21.7°C / 71.1°F |
| October | 20.7–22.7°C | 21.9°C / 71.4°F |
| November | 21.9–23.8°C | 22.7°C / 72.9°F |
| December | 23.0–23.9°C | 23.5°C / 74.3°F |
Source: Open-Meteo Marine API, MeteoFrance sea-surface temperature dataset. Nearest sea grid cell (-22.96, -42.04). 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.
Arraial do Cabo in January
Typical January water temperature near Arraial do Cabo is 24.3°C (75.7°F), with yearly monthly means from 22.6–25.4°C.
Arraial do Cabo in February
Typical February water temperature near Arraial do Cabo is 24.8°C (76.6°F), with yearly monthly means from 23.6–26.0°C.
Arraial do Cabo in March
Typical March water temperature near Arraial do Cabo is 25.3°C (77.5°F), with yearly monthly means from 24.8–25.8°C.
Arraial do Cabo in April
Typical April water temperature near Arraial do Cabo is 24.6°C (76.3°F), with yearly monthly means from 24.4–25.1°C.
Arraial do Cabo in May
Typical May water temperature near Arraial do Cabo is 23.6°C (74.5°F), with yearly monthly means from 23.3–23.8°C.
Arraial do Cabo in June
Typical June water temperature near Arraial do Cabo is 22.6°C (72.7°F), with yearly monthly means from 21.7–23.5°C.
Arraial do Cabo in July
Typical July water temperature near Arraial do Cabo is 22.1°C (71.8°F), with yearly monthly means from 21.4–23.0°C.
Arraial do Cabo in August
Typical August water temperature near Arraial do Cabo is 21.8°C (71.2°F), with yearly monthly means from 21.4–22.6°C.
Arraial do Cabo in September
Typical September water temperature near Arraial do Cabo is 21.7°C (71.1°F), with yearly monthly means from 21.2–22.5°C.
Arraial do Cabo in October
Typical October water temperature near Arraial do Cabo is 21.9°C (71.4°F), with yearly monthly means from 20.7–22.7°C.
Arraial do Cabo in November
Typical November water temperature near Arraial do Cabo is 22.7°C (72.9°F), with yearly monthly means from 21.9–23.8°C.
Arraial do Cabo in December
Typical December water temperature near Arraial do Cabo is 23.5°C (74.3°F), with yearly monthly means from 23.0–23.9°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 | 22.7°C / 72.9°F | 23.2°C / 73.8°F | 24.1°C / 75.4°F |
| July | 22.3°C / 72.1°F | 22.8°C / 73.0°F | 23.4°C / 74.1°F |
| August | 21.8°C / 71.2°F | 22.5°C / 72.5°F | 23.6°C / 74.5°F |
| September | 21.7°C / 71.1°F | 22.4°C / 72.3°F | 23.7°C / 74.7°F |
Partial coverage: 4 calendar months with records. Profile calculated from 2775 hourly forecast records across 4 monthly periods. This is a growing archive, not a long-term climate normal.
About the water at Arraial do Cabo
The 'Brazilian Caribbean' with clear water, coves and resident turtles.
- Area
- Rio de Janeiro
Arraial do Cabo Water Temperature: Common Questions
What is the water temperature in Arraial do Cabo today?
The current sea surface temperature near Arraial do Cabo is 22.1°C (71.8°F). Over the last 30 days, the average has been 22.4°C.
When is the water warmest in Arraial do Cabo?
The water is typically warmest in March, at around 25.3°C (77.5°F) in the 2023–2025 historical baseline.
When is the water coldest in Arraial do Cabo?
The water is typically coldest in September, at around 21.7°C (71.1°F) in the same historical baseline.
Can you swim in Arraial do Cabo today?
At 22.1°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 Arraial do Cabo.
View Snorkel Forecast →