- Forecast
- Maps
- Live
- Weather State
- Spot Information
Ostional Surf Forecast
/ Guanacaste (28 surf breaks) /
Surf Forecasts:
Ostional surfForecast / Guanacaste / Costa Rica
16 Day Weather and Surf, issued 11 pm Wednesday 29 Apr 2026 CSTForecast update in hr min s Forecast update imminent
Ostional surf forecast is for near shore open water. Breaking waves will often be smaller at less exposed spots.
Today's Ostional sea temperature is
30.0° C
(Which is 1.2°C warmer than normal for this time of year)Best Forecast Surf Conditions for Ostional this week:
The surf forecast for Ostional over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Thursday (Apr 30) at 6AM. The primary swell is predicted to be 0.9m and 13s period with a secondary swell of 0.2m and 15s. The wind is predicted to be cross-offshore as the swell arrives.
The most powerful waves expected at Ostional in the next 16 days are 0.9m 16s and forecast to arrive on Wednesday (May 06) at 12PM. Winds are predicted to be onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.9m 12s period and expected on Thursday (Apr 30) at 9AM.
| Wave Type | Time (CST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 6AM (Thu 30th Apr) | 3ft (0.9m) 13s |
| Best Surf | 9PM (Wed 6th May) | 2.5ft (0.8m) 16s |
| Most Powerful | 12PM (Wed 6th May) | 3ft (0.9m) 16s |
Table - best surf conditions forecast for Ostional over the next 16 days.
Updates in hr min s Forecast update imminent
Short Range ForecastHeavy rain (total 21mm), heaviest during Fri night. Warm (max 30°C on Thu morning, min 26°C on Fri night). Wind will be generally light. | Days 5-7 Weather SummaryHeavy rain (total 90mm), heaviest during Mon night. Warm (max 30°C on Sun morning, min 25°C on Mon night). Wind will be generally light. | ||||||||||||||||||||
Thursday 30 | Friday 1 | Saturday 2 | Sunday 3 | Monday 4 | Tuesday 5 | Wed 6 | |||||||||||||||
Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | |
Swell Height Map |  |  |  |  |  |  |  |  | |||||||||||||
SSW 13 | SW 14 | WNW 16 | S 10 | SSW 13 | SSW 13 | WNW 14 | SW 16 | SW 16 | SW 16 | SW 15 | SW 15 | SW 18 | SW 16 | SW 13 | SW 16 | SW 16 | SW 15 | SW 14 | SW 15 | SW 16 | |
178 | 31 | 47 | 0 | 53 | 55 | 40 | 67 | 66 | 63 | 136 | 104 | 152 | 125 | 113 | 306 | 310 | 171 | 251 | 395 | 406 | |
Wind (km/h) | |||||||||||||||||||||
off | glassy | on | glassy | glassy | on | glassy | glassy | cross-on | cross-off | cross-on | on | cross-off | glassy | cross | glassy | glassy | cross | off | glassy | cross-on | |
High Tide | 1:43AM2.12m | 1:55PM2.37m | 2:24AM2.16m | 2:33PM2.40m | 3:02AM2.19m | 3:10PM2.40m | 3:39AM2.19m | 3:46PM2.38m | 4:16AM2.16m | 4:23PM2.33m | 4:54AM2.11m | 5:01PM2.26m | 5:34AM2.05m | 5:40PM2.17m | |||||||
Low Tide | 7:42AM0.47m | 8:16PM0.31m | 8:22AM0.44m | 8:54PM0.25m | 9:00AM0.42m | 9:31PM0.23m | 9:37AM0.42m | 10:08PM0.24m | 10:14AM0.45m | 10:45PM0.28m | 10:51AM0.50m | 11:23PM0.35m | 11:30AM0.58m | ||||||||
 |  | | |  |  |  | | | | | | | | | |  | | | | | |
 | — | 5:26 | — | — | 5:24 | — | — | 5:24 | — | — | 5:24 | — | — | 5:24 | — | — | 5:24 | — | — | 5:24 | — |
 | — | — | 5:53 | — | — | 5:53 | — | — | 5:53 | — | — | 5:53 | — | — | 5:53 | — | — | 5:54 | — | — | 5:54 |
— | — | — | — | — | 1 | 18 | — | 2 | 8 | — | 4 | 6 | — | 3 | 62 | 2 | 5 | 6 | — | 5 | |
Temp °C | 29 | 30 | 29 | 29 | 30 | 29 | 29 | 28 | 29 | 28 | 30 | 29 | 28 | 29 | 29 | 26 | 29 | 29 | 28 | 29 | 29 |
33 | 33 | 31 | 33 | 34 | 31 | 33 | 31 | 32 | 31 | 32 | 32 | 33 | 33 | 32 | 30 | 33 | 32 | 31 | 34 | 32 | |
Swell 1 Height (m) Direction Period (s) | SSW 13 | S 12 | S 12 | S 10 | S 10 | S 10 | S 11 | S 11 | S 11 | S 11 | S 6 | S 10 | S 10 | S 10 | S 9 | SW 16 | SW 16 | SW 15 | SW 14 | SW 15 | SW 16 |
 kJ | 178 | 243 | 180 | 94 | 98 | 98 | 157 | 157 | 157 | 144 | 36 | 78 | 90 | 89 | 62 | 306 | 310 | 171 | 251 | 395 | 406 |
Swell 2 Height (m) Direction Period (s) | S 10 | SW 14 | SW 14 | S 12 | SSW 13 | SSW 13 | WNW 14 | SW 16 | SW 16 | SW 16 | S 11 | S 6 | SW 14 | SW 16 | SW 13 | S 9 | S 9 | S 9 | S 8 | S 18 | S 7 |
| kJ | 68 | 31 | 30 | 77 | 53 | 55 | 40 | 67 | 66 | 63 | 79 | 25 | 95 | 125 | 113 | 60 | 39 | 37 | 34 | 225 | 44 |
Swell 3 Height (m) Direction Period (s) | WNW 15 | S 16 | WNW 16 | S 15 | SW 12 | SW 13 | SW 13 | SW 12 | SSW 12 | WNW 13 | SW 15 | SW 15 | SW 18 | SW 13 | S 15 | S 14 | S 13 | SW 18 | SSW 15 | S 8 | SSW 17 |
| kJ | 21 | 43 | 47 | 17 | 23 | 42 | 26 | 23 | 15 | 17 | 136 | 104 | 152 | 85 | 68 | 91 | 55 | 150 | 73 | 32 | 159 |
Wind waves Height (m) Direction Period (s) | — | NW 8 | — | — | NW 6 | W 2 | — | — | — | — | — | WNW 4 | — | — | WNW 2 | — | — | — | — | — | — |
| kJ | — | 2 | — | — | 2 | 1 | — | — | — | — | — | 1 | — | — | 2 | — | — | — | — | — | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 0 | 5 | 91 | 5 | 0 | 17 | 0 | 0 | 17 | 0 | 7 | 17 | 5 | 0 | 25 | 0 | 0 | 11 | 0 | 0 | 25 |
Best forecast wave conditions in Guanacaste | |||||||||||||||||||||
Best forecast wave conditions in Costa Rica | |||||||||||||||||||||
Header Global | |||||||||||||||||||||
- Map Icons:
Break
Live Wave Height (m)
Live Wind Speed (km/h)
Surf Rating (10 Max)
Ocean Swells (m)- Wind Speed (km/h)
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.
Information about the Ostional Surf forecast
The above surf forecast table for Ostional provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Ostional can be found by selecting the local surf guide option on the grey menu. Our Ostional surf forecast is unique since it includes wave energy (power) that defines the real feel of the surf rather than just the height or the period. If you surf the same spot (Ostional) regularly then make a mental note of the wave energy from the surf forecast table each time you go. Very soon you may start to choose your surf days based on the wave energy alone combined with our forecast of favourable offshore wind conditions. Our star ratings will help here and of course you will also find the usual wave height and period predictions on our surf forecasts as well as a full break down of the swell components under our advanced users option (to reveal that, click the little Einstein character under the tide times).
Further information to help with frequently asked questions about our surf forecast for Ostional may be found under the help tab on the top menu and also by moving your mouse over the question marks on the surf forecast table itself. Please always bear in mind that the forecast is for near-shore open water and local factors at each surf break influence the actual breaking wave height, such as the beach / reef profile, water depths offshore and shelter.
Ostional is 35 km (22 miles) from Nicoya. If you plan a holiday in Guanacaste, look for hotels and other accommodation in Nicoya. Nicoya has rooms for a wide range of budgets as well as car hire and transport links.
Nearest