- Forecast
- Maps
- Live
- Weather State
- Spot Information
Avellanas Rivermouth Surf Forecast
/ Guanacaste (28 surf breaks) /
Avellanas Rivermouth surfForecast / Guanacaste / Costa Rica
48hr Weather and Surf, issued 11 am Friday 15 Aug 2025 CST
How big are the waves at Avellanas Rivermouth today?
The current surf forecast for Avellanas Rivermouth at 1PM is: 0.8m 13s primary swell from a Southwest direction and 0.8m 7s secondary swell from a South direction (forecast issued at 11:00am August 15). The wind direction is predicted to be cross-shore.
| Time (CST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (15 Aug) | 2ft (0.6m) | 16s |
| Afternoon (15 Aug) | 2.5ft (0.7m) | 13s |
| Evening (15 Aug) | 2.5ft (0.8m) | 13s |
Table - waves today at Avellanas Rivermouth. (Swell directed towards the surf break)
Friday 15 | Saturday 16 | Sunday 17 | Monday 18 | |||||||||||||||||||||
| 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 | 13 | 16 | 16 | 13 | 14 | 14 | 15 | 14 | 14 | 15 | 15 | 15 | 14 | 14 | 14 | 14 | 14 | 13 | 13 | 18 | 18 | 18 | 18 |
Wave (?)Graph  | ||||||||||||||||||||||||
| Energy (?) | 361 | 399 | 364 | 359 | 322 | 351 | 295 | 291 | 254 | 247 | 263 | 248 | 253 | 364 | 437 | 357 | 326 | 311 | 202 | 191 | 327 | 372 | 430 | 428 |
Wind (km/h) | ||||||||||||||||||||||||
| Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy | on | cross- on | cross- off | cross- off | cross | cross- on | on | glass | glass | off | off | cross- off | cross- off | glass | glass | glass | glass | off | off | cross- off | cross | glass | glass | glass |
High Tide / height (m) | 6:45AM 2.54 | 7:09PM 2.19 | 7:36AM 2.45 | 8:05PM 2.06 | 8:34AM 2.33 | 9:11PM 1.96 | ||||||||||||||||||
Low Tide / height (m) | 1:05PM 0.29 | 1:13AM 0.33 | 2:01PM 0.38 | 2:09AM 0.45 | 3:04PM 0.46 | 3:14AM 0.55 | ||||||||||||||||||
Friday 15 | Saturday 16 | Sunday 17 | Monday 18 | |||||||||||||||||||||
| Sunrise | 5:33 | - | - | - | - | - | - | 5:33 | - | - | - | - | - | - | - | 5:33 | - | - | - | - | - | - | - | 5:33 |
| Sunset | - | - | - | 6:00 | - | - | - | - | - | - | - | 6:00 | - | - | - | - | - | - | - | 6:00 | - | - | - | - |
 |  | |  |  | | |  | | | | |  | | | | | | | | |  | | | |
Rain (mm) | - | - | - | 1 | - | - | - | - | - | 1 | 1 | - | - | - | - | - | - | 1 | - | - | - | 1 | 1 | - |
| Temp. °C | 27 | 29 | 29 | 27 | 27 | 26 | 25 | 25 | 27 | 28 | 28 | 27 | 26 | 26 | 25 | 25 | 27 | 28 | 28 | 27 | 26 | 26 | 25 | 25 |
| Feels °C (?) | 28 | 31 | 31 | 30 | 30 | 30 | 29 | 29 | 32 | 31 | 31 | 30 | 29 | 30 | 29 | 29 | 31 | 31 | 30 | 30 | 29 | 30 | 29 | 29 |
- Map Icons:
Break
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
Wind reports 51 km away suggest it is still onshore at Avellanas Rivermouth (light winds from the ENE at Liberia/Tomas Guardia Airport). 0.7m 14s groundswell from the SW with a 0.6m 6s windswell 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 Avellanas Rivermouth 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.
Nearest