Manuel Antonio Water Temperature
Updated Tue 10:07 (America/Costa_Rica)
Costa Rica · Forecast updated Sep 22, 2026, 10:07 UTC
Current Sea Temperature
30.1°C
86.2°F
Very warm water
Valid Sep 22, 2026, 10:07 (America/Costa_Rica). Source: stored Open-Meteo marine forecast. Temperature is not a safety rating or snorkel score.
Versus this month's average
0.7°C above
The typical September average is 29.4°C (84.9°F) from the historical baseline.
Recent trend
Holding fairly steady
Seven-day average: 30.4°C, versus 30.3°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 Manuel Antonio, typical monthly averages range from about 28.2°C (82.8°F) in November to 30.7°C (87.3°F) in April.
Over the past 30 days, the average sea temperature in Manuel Antonio has been 30.3°C.
Historical baseline (full year)
Northern Hemisphere. Summer is generally June–August; winter is December–February.
Typical monthly sea-surface temperature near Manuel Antonio, calculated from hourly observations for 2023–2025. This is not this site's forecast archive.
| Month | Typical range | Average |
|---|---|---|
| January | 28.9–30.5°C | 29.5°C / 85.1°F |
| February | 29.7–30.9°C | 30.3°C / 86.5°F |
| March | 29.8–31.1°C | 30.5°C / 86.9°F |
| April | 30.5–30.8°C | 30.7°C / 87.3°F |
| May | 29.9–31.0°C | 30.4°C / 86.7°F |
| June | 29.1–30.2°C | 29.5°C / 85.1°F |
| July | 28.6–30.0°C | 29.4°C / 84.9°F |
| August | 28.9–30.0°C | 29.3°C / 84.7°F |
| September | 28.9–30.1°C | 29.4°C / 84.9°F |
| October | 28.1–29.7°C | 28.8°C / 83.8°F |
| November | 27.7–28.8°C | 28.2°C / 82.8°F |
| December | 28.6–29.8°C | 29.1°C / 84.4°F |
Source: Open-Meteo Marine API, MeteoFrance sea-surface temperature dataset. Nearest sea grid cell (9.38, -84.12). 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.
Manuel Antonio in January
Typical January water temperature near Manuel Antonio is 29.5°C (85.1°F), with yearly monthly means from 28.9–30.5°C.
Manuel Antonio in February
Typical February water temperature near Manuel Antonio is 30.3°C (86.5°F), with yearly monthly means from 29.7–30.9°C.
Manuel Antonio in March
Typical March water temperature near Manuel Antonio is 30.5°C (86.9°F), with yearly monthly means from 29.8–31.1°C.
Manuel Antonio in April
Typical April water temperature near Manuel Antonio is 30.7°C (87.3°F), with yearly monthly means from 30.5–30.8°C.
Manuel Antonio in May
Typical May water temperature near Manuel Antonio is 30.4°C (86.7°F), with yearly monthly means from 29.9–31.0°C.
Manuel Antonio in June
Typical June water temperature near Manuel Antonio is 29.5°C (85.1°F), with yearly monthly means from 29.1–30.2°C.
Manuel Antonio in July
Typical July water temperature near Manuel Antonio is 29.4°C (84.9°F), with yearly monthly means from 28.6–30.0°C.
Manuel Antonio in August
Typical August water temperature near Manuel Antonio is 29.3°C (84.7°F), with yearly monthly means from 28.9–30.0°C.
Manuel Antonio in September
Typical September water temperature near Manuel Antonio is 29.4°C (84.9°F), with yearly monthly means from 28.9–30.1°C.
Manuel Antonio in October
Typical October water temperature near Manuel Antonio is 28.8°C (83.8°F), with yearly monthly means from 28.1–29.7°C.
Manuel Antonio in November
Typical November water temperature near Manuel Antonio is 28.2°C (82.8°F), with yearly monthly means from 27.7–28.8°C.
Manuel Antonio in December
Typical December water temperature near Manuel Antonio is 29.1°C (84.4°F), with yearly monthly means from 28.6–29.8°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 | 28.9°C / 84.0°F | 30.0°C / 85.9°F | 31.1°C / 88.0°F |
| July | 29.5°C / 85.1°F | 30.4°C / 86.7°F | 31.3°C / 88.3°F |
| August | 29.5°C / 85.1°F | 30.4°C / 86.7°F | 31.3°C / 88.3°F |
| September | 29.6°C / 85.3°F | 30.3°C / 86.6°F | 31.2°C / 88.2°F |
Partial coverage: 4 calendar months with records. Profile calculated from 2731 hourly forecast records across 4 monthly periods. This is a growing archive, not a long-term climate normal.
About the water at Manuel Antonio
National-park beaches with calm bays and reef close to shore.
- Area
- Puntarenas
Manuel Antonio Water Temperature: Common Questions
What is the water temperature in Manuel Antonio today?
The current sea surface temperature near Manuel Antonio is 30.1°C (86.2°F). Over the last 30 days, the average has been 30.3°C.
When is the water warmest in Manuel Antonio?
The water is typically warmest in April, at around 30.7°C (87.3°F) in the 2023–2025 historical baseline.
When is the water coldest in Manuel Antonio?
The water is typically coldest in November, at around 28.2°C (82.8°F) in the same historical baseline.
Can you swim in Manuel Antonio today?
At 30.1°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 Manuel Antonio.
View Snorkel Forecast →