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Ostional Surf Forecast
/ Guanacaste (28 surf breaks) /
Ostional surfForecast / Guanacaste / Costa Rica
48hr Weather and Surf, issued 11 am Tuesday 12 Aug 2025 CST
How big are the waves at Ostional today?
The current surf forecast for Ostional at 6PM is: 1.3m 16s primary swell from a Southwest direction and 0.6m 6s secondary swell from a South-southwest direction (forecast issued at 11:00am August 12). The wind direction is predicted to be cross-onshore.
| Time (CST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (12 Aug) | 4.5ft (1.3m) | 16s |
| Afternoon (12 Aug) | 4.5ft (1.3m) | 16s |
| Evening (12 Aug) | 4.5ft (1.3m) | 16s |
Table - waves today at Ostional. (Swell directed towards the surf break)
Tuesday 12 | Wednesday 13 | Thursday 14 | Friday 15 | |||||||||||||||||||||
| 9 AM | 12 PM | 3 PM | 6 PM | 9 PM | 0 AM | 3 AM | 6 AM | 9 AM | 12 PM | 3 PM | 6 PM | 9 PM | 0 AM | 3 AM | 6 AM | 9 AM | 12 PM | 3 PM | 6 PM | 9 PM | 0 AM | 3 AM | 6 AM | |
Rating (10 max) | ||||||||||||||||||||||||
Swell Height Map |    |    |    |    | ||||||||||||||||||||
| Wave Height (m) & direction (?) | ||||||||||||||||||||||||
| Period(s) (?) | 16 | 16 | 16 | 16 | 16 | 16 | 16 | 16 | 15 | 15 | 15 | 15 | 15 | 15 | 14 | 14 | 14 | 14 | 14 | 14 | 14 | 14 | 14 | 14 |
Wave (?)Graph  | ||||||||||||||||||||||||
| Energy (?) | 919 | 869 | 886 | 853 | 854 | 883 | 880 | 700 | 644 | 613 | 589 | 561 | 565 | 565 | 506 | 432 | 446 | 447 | 447 | 455 | 455 | 464 | 421 | 343 |
Wind (km/h) | ||||||||||||||||||||||||
| Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy | cross- off | on | cross- on | cross- on | glass | glass | cross- off | cross- off | cross | cross- on | on | glass | off | off | off | cross- off | cross- off | cross | cross- off | cross- off | off | off | cross- off | off |
High Tide / height (m) | 4:48PM 2.44 | 5:15AM 2.60 | 5:32PM 2.39 | 5:58AM 2.60 | 6:19PM 2.30 | |||||||||||||||||||
Low Tide / height (m) | 10:43AM 0.23 | 10:57PM 0.12 | 11:28AM 0.21 | 11:39PM 0.15 | 12:15PM 0.23 | 12:24AM 0.22 | ||||||||||||||||||
Tuesday 12 | Wednesday 13 | Thursday 14 | Friday 15 | |||||||||||||||||||||
| Sunrise | 5:33 | - | - | - | - | - | - | 5:33 | - | - | - | - | - | - | - | 5:33 | - | - | - | - | - | - | - | 5:33 |
| Sunset | - | - | - | 6:01 | - | - | - | - | - | - | - | 6:00 | - | - | - | - | - | - | - | 6:00 | - | - | - | - |
 | | |  |  |  | | | | | | |  | | |  | | | | | | | |  | |
Rain (mm) | - | - | - | 1 | - | 4 | 1 | - | - | - | 2 | 3 | - | - | 1 | - | - | - | 4 | 4 | 2 | - | - | - |
| Temp. °C | 27 | 29 | 28 | 27 | 27 | 27 | 26 | 26 | 27 | 29 | 29 | 28 | 27 | 26 | 26 | 25 | 27 | 28 | 28 | 27 | 25 | 25 | 25 | 25 |
| Feels °C (?) | 30 | 33 | 31 | 31 | 31 | 31 | 30 | 30 | 30 | 33 | 33 | 33 | 31 | 29 | 30 | 28 | 30 | 31 | 31 | 31 | 28 | 28 | 28 | 28 |
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Live Wave Height (m)
Live Wind Speed (km/h)
Surf Rating (10 Max)
Ocean Swells (m)- Wind Speed (km/h)
Recent Eyeball Surf Reports for Guanacaste
The wind is still cross-on at Ostional (light winds from the NW at Liberia/Tomas Guardia Airport 66 km from Ostional). 1.0m 16s long period groundswell from the SW with a 0.3m 11s groundswell from the SSW. 2 swells combining to make bigger set waves.
FREE! Surf-Forecast.com widget for your website
The surf report / weather widget below is available to embed on third party websites free of charge and provides a summary of our Ostional surf forecast. Simply grab the html code snippet that we provide and paste it into your own site. You can choose your preferred language and metric/imperial units for the surf forecast feed to suit users of your site. Click here to get the code.
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