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Avellanas Rivermouth Surf Forecast
/ Guanacaste (28 surf breaks) /
Surf Forecasts:
Avellanas Rivermouth surfForecast / Guanacaste / Costa Rica
16 Day Weather and Surf, issued 5 am Monday 25 May 2026 CSTForecast update in hr min s Forecast update imminent
Avellanas Rivermouth surf forecast is for near shore open water. Breaking waves will often be smaller at less exposed spots.
Today's Avellanas Rivermouth sea temperature is
30.8° C
(Which is 2.2°C warmer than normal for this time of year)Best Forecast Surf Conditions for Avellanas Rivermouth this week:
The surf forecast for Avellanas Rivermouth over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Monday (May 25) at 3PM. The primary swell is predicted to be 1.3m and 15s period with a secondary swell of 0.5m and 8s. The wind is predicted to be cross-offshore as the swell arrives.
The most powerful waves expected at Avellanas Rivermouth in the next 16 days are 1.7m 18s and forecast to arrive on Monday (Jun 01) at 9AM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.4m 6s period and expected on Wednesday (May 27) at 9PM.
| Wave Type | Time (CST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 3PM (Mon 25th May) | 4.5ft (1.3m) 15s |
| Best Surf | 3PM (Sat 30th May) | 3ft (0.9m) 17s |
| Most Powerful | 9AM (Mon 1st Jun) | 5.5ft (1.7m) 18s |
Table - best surf conditions forecast for Avellanas Rivermouth over the next 16 days.
Updates in hr min s Forecast update imminent
Short Range ForecastLight rain (total 9mm), mostly falling on Wed night. Warm (max 33°C on Mon morning, min 27°C on Mon night). Wind will be generally light. | Days 4-6 Weather SummaryHeavy rain (total 38mm), heaviest during Fri night. Warm (max 30°C on Thu morning, min 25°C on Fri night). Wind will be generally light. | ||||||||||||||||||||
Monday 25 | Tuesday 26 | Wednesday 27 | Thursday 28 | Friday 29 | Saturday 30 | Sunday 31 | |||||||||||||||
AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | |
Swell Height Map |  |  |  |  |  |  |  | ||||||||||||||
SW 16 | SW 15 | SW 15 | SW 14 | SW 14 | SW 14 | SW 14 | SW 13 | SW 13 | SW 14 | SW 15 | SW 13 | SW 14 | SW 14 | SW 14 | S 17 | S 17 | S 16 | SW 20 | SW 19 | SW 18 | |
737 | 714 | 685 | 598 | 581 | 507 | 363 | 352 | 295 | 313 | 418 | 172 | 268 | 167 | 164 | 596 | 459 | 836 | 746 | 1210 | 1326 | |
Wind (km/h) | |||||||||||||||||||||
on | cross-off | on | cross-on | cross-off | glassy | glassy | off | cross-off | glassy | cross-off | cross-off | cross-off | cross-off | off | glassy | cross-off | glassy | off | off | cross-off | |
High Tide | 10:02AM2.20m | 10:29PM1.96m | 10:59AM2.20m | 11:31PM1.93m | 11:52AM2.21m | 00:25AM1.95m | 12:38PM2.23m | 1:13AM1.98m | 1:22PM2.25m | 1:57AM2.01m | 2:03PM2.28m | 2:37AM2.05m | 2:43PM2.30m | ||||||||
Low Tide | 4:25PM0.60m | 4:36AM0.59m | 5:26PM0.57m | 5:32AM0.62m | 6:20PM0.52m | 6:23AM0.62m | 7:06PM0.46m | 7:09AM0.60m | 7:49PM0.40m | 7:52AM0.57m | 8:29PM0.35m | 8:32AM0.53m | 9:08PM0.31m | ||||||||
 | |  | |  |  | | | | | | | | | | |  |  | | | | |
 | 5:20 | — | — | 5:20 | — | — | 5:20 | — | — | 5:20 | — | — | 5:20 | — | — | 5:20 | — | — | 5:20 | — | — |
 | — | 5:59 | — | — | 6:00 | — | — | 6:00 | — | — | 6:00 | — | — | 6:00 | — | — | 6:00 | — | — | 6:00 | — |
— | — | 1 | — | 1 | — | — | — | 7 | — | 1 | 12 | — | 7 | 14 | — | — | 4 | 1 | — | 3 | |
Temp °C | 33 | 31 | 30 | 31 | 29 | 28 | 32 | 30 | 28 | 30 | 30 | 28 | 30 | 29 | 27 | 29 | 29 | 28 | 30 | 30 | 28 |
35 | 33 | 31 | 32 | 31 | 31 | 34 | 31 | 31 | 32 | 32 | 31 | 33 | 30 | 30 | 32 | 31 | 32 | 33 | 33 | 32 | |
Swell 1 Height (m) Direction Period (s) | SW 16 | SW 15 | SW 15 | SW 14 | SW 14 | SW 14 | SW 14 | SW 13 | SW 13 | SW 14 | SW 15 | SW 13 | SW 14 | SW 14 | SW 14 | S 17 | SW 13 | S 16 | S 15 | SW 19 | SW 18 |
 kJ | 737 | 714 | 685 | 598 | 581 | 507 | 363 | 352 | 295 | 313 | 418 | 172 | 268 | 167 | 164 | 596 | 406 | 836 | 723 | 1210 | 1326 |
Swell 2 Height (m) Direction Period (s) | S 8 | S 8 | S 7 | S 7 | S 6 | S 6 | S 6 | SSW 6 | S 7 | S 7 | S 8 | SW 16 | S 7 | SSW 12 | S 6 | SW 13 | S 17 | SW 21 | SW 20 | S 14 | S 14 |
| kJ | 32 | 30 | 38 | 46 | 29 | 29 | 38 | 41 | 35 | 36 | 28 | 119 | 27 | 94 | 29 | 208 | 459 | 543 | 746 | 703 | 453 |
Swell 3 Height (m) Direction Period (s) | S 11 | N 5 | S 15 | S 15 | SW 9 | SW 5 | — | — | WSW 6 | SW 6 | SW 6 | S 8 | WSW 4 | S 7 | SSW 12 | SSW 6 | S 14 | SW 13 | SW 16 | SW 14 | SW 14 |
| kJ | 9 | 4 | 4 | 4 | 3 | 7 | — | — | 13 | 9 | 8 | 31 | 7 | 23 | 94 | 27 | 181 | 161 | 299 | 301 | 245 |
Wind waves Height (m) Direction Period (s) | NNE 3 | — | — | — | — | — | — | — | — | — | — | — | — | WSW 4 | — | — | — | — | — | — | — |
| kJ | 4 | — | — | — | — | — | — | — | — | — | — | — | — | 6 | — | — | — | — | — | — | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 1 | 0 | 1 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 199 | 0 | 0 | 226 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
Best forecast wave conditions in Guanacaste | |||||||||||||||||||||
Best forecast wave conditions in Costa Rica | |||||||||||||||||||||
Header Global | |||||||||||||||||||||
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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.
Information about the Avellanas Rivermouth Surf forecast
The above surf forecast table for Avellanas Rivermouth provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Avellanas Rivermouth can be found by selecting the local surf guide option on the grey menu. Our Avellanas Rivermouth 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 (Avellanas Rivermouth) 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 Avellanas Rivermouth 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.
Avellanas Rivermouth is 44 km (27 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.
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