Surf Forecasts:
Avellanas Rivermouth surf forecast from 28 Jun 2026:
- Best quality surf: Monday 29 Jun, 6PM (local time) - 3ft (0.9m), 14s period, SSW swell with glassy winds.
- Most powerful swell: Wednesday 1 Jul, 12AM (local time) - 3.5ft (1.0m), 18s period, SW swell with 607 kJ wave energy.
- Next surfable swell (1★+): Monday 29 Jun, 6PM (local time) - 3ft (0.9m), 14s period with SSW swell.
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 (Jun 29) at 6PM. The primary swell is predicted to be 0.9m and 14s period with a secondary swell of 0.7m and 10s. The wind is predicted to be glassy as the swell arrives.
The most powerful waves expected at Avellanas Rivermouth in the next 16 days are 1.0m 18s and forecast to arrive on Wednesday (Jul 01) at 12AM. Winds are predicted to be cross-onshore at the time the swell arrives.
| Wave Type | Time (CST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 6PM (Mon 29th Jun) | 3ft (0.9m) 14s |
| Best Surf | 6PM (Mon 29th Jun) | 3ft (0.9m) 14s |
| Most Powerful | 12AM (Wed 1st Jul) | 3.5ft (1.0m) 18s |
Table - best surf conditions forecast for Avellanas Rivermouth over the next 16 days.
Updates in hr min s Forecast update imminent
Short Range ForecastMostly dry. Warm (max 32°C on Sun morning, min 25°C on Sun night). Winds decreasing (fresh winds from the ENE on Sat night, calm by Mon afternoon). | Days 5-7 Weather SummaryLight rain (total 4mm), mostly falling on Thu afternoon. Warm (max 32°C on Wed afternoon, min 25°C on Wed night). Winds increasing (calm on Tue afternoon, fresh winds from the ENE by Wed morning). | ||||||||||||||||||||
Sat 27 | Sunday 28 | Monday 29 | Tuesday 30 | Wednesday 1 | Thursday 2 | Friday 3 | |||||||||||||||
PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | |
Swell Height Map |  |  |  |  |  |  |  |  | |||||||||||||
Wave Height (m) Direction Period (s) | SW 16 | SW 15 | SW 15 | SW 15 | SW 16 | SW 16 | SW 15 | SW 14 | SW 14 | SW 18 | SW 18 | SW 16 | SW 16 | SW 16 | SW 16 | SW 15 | SW 15 | SSW 16 | SSW 16 | SSW 16 | SSW 16 |
Wave Graph  | |||||||||||||||||||||
 kJ | 757 | 597 | 574 | 566 | 483 | 483 | 418 | 305 | 301 | 255 | 607 | 318 | 381 | 502 | 411 | 322 | 329 | 346 | 354 | 324 | 333 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross-on | cross-on | on | on | cross-on | on | cross-on | cross-on | glassy | cross-on | cross-on | on | on | on | cross-on | cross-on | on | glassy | on | on |
High Tide | 1:29AM1.89m | 1:36PM2.17m | 2:14AM1.94m | 2:20PM2.21m | 2:57AM2.01m | 3:02PM2.25m | 3:38AM2.07m | 3:42PM2.27m | 4:17AM2.12m | 4:20PM2.26m | 4:55AM2.16m | 4:58PM2.23m | 5:32AM2.18m | ||||||||
Low Tide | 7:22PM0.50m | 7:23AM0.66m | 8:06PM0.44m | 8:08AM0.61m | 8:47PM0.38m | 8:51AM0.57m | 9:26PM0.34m | 9:33AM0.55m | 10:04PM0.31m | 10:13AM0.54m | 10:40PM0.32m | 10:53AM0.55m | 11:15PM0.34m | 11:32AM0.57m | |||||||
 |  | | | |  | |  | | | | | | | |  | | | | | | |
 | — | — | 5:24 | — | — | 5:24 | — | — | 5:24 | — | — | 5:24 | — | — | 5:26 | — | — | 5:26 | — | — | 5:26 |
 | 6:07 | — | — | 6:07 | — | — | 6:07 | — | — | 6:07 | — | — | 6:07 | — | — | 6:07 | — | — | 6:07 | — | 6:07 |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 4 | — | — | 3 | — | — |
Temp °C | 31 | 28 | 32 | 32 | 27 | 30 | 32 | 28 | 31 | 31 | 28 | 31 | 32 | 28 | 31 | 31 | 27 | 31 | 31 | 27 | 31 |
Feels °C | 30 | 26 | 30 | 30 | 28 | 31 | 35 | 31 | 33 | 36 | 31 | 30 | 31 | 29 | 33 | 35 | 30 | 34 | 36 | 31 | 34 |
Swell 1 Height (m) Direction Period (s) | SW 16 | SW 15 | SW 15 | SW 15 | SW 16 | SW 16 | SW 15 | SW 14 | SW 14 | SW 14 | SW 18 | SW 16 | SW 16 | SW 16 | SW 16 | SW 15 | SW 15 | S 10 | S 11 | SSW 16 | SSW 16 |
| kJ | 757 | 597 | 574 | 566 | 483 | 483 | 418 | 305 | 301 | 203 | 607 | 318 | 381 | 502 | 411 | 322 | 326 | 138 | 141 | 324 | 333 |
Swell 2 Height (m) Direction Period (s) | S 11 | S 11 | S 11 | S 10 | S 10 | S 10 | S 10 | S 10 | S 9 | SW 18 | S 9 | S 18 | S 10 | S 10 | S 10 | S 11 | S 11 | SSW 16 | SSW 16 | S 10 | S 11 |
| kJ | 199 | 184 | 143 | 141 | 130 | 94 | 94 | 89 | 85 | 255 | 80 | 304 | 89 | 118 | 106 | 149 | 141 | 346 | 354 | 123 | 146 |
Swell 3 Height (m) Direction Period (s) | N 5 | — | SW 24 | SW 24 | SW 21 | SW 21 | N 5 | SW 20 | SW 18 | S 9 | S 18 | S 10 | S 16 | S 16 | SSW 15 | S 18 | SSW 18 | SW 14 | SW 14 | SW 14 | SW 14 |
| kJ | 7 | — | 22 | 22 | 72 | 71 | 7 | 186 | 155 | 80 | 162 | 87 | 195 | 186 | 174 | 167 | 329 | 248 | 162 | 162 | 96 |
Wind waves Height (m) Direction Period (s) | NNE 5 | NE 4 | NE 4 | NNE 5 | NNE 5 | NNE 5 | — | NNE 5 | — | — | NNE 5 | NNE 4 | — | NE 3 | NNE 5 | — | N 5 | NNE 5 | N 5 | NNE 5 | NNE 4 |
| kJ | 8 | 21 | 22 | 8 | 19 | 13 | — | 7 | — | — | 8 | 18 | — | 5 | 9 | — | 11 | 22 | 11 | 12 | 36 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 19 | 19 | 19 | 7 | 1 | 8 | 1 | 19 | 19 | 0 | 19 | 19 | 7 | 1 | 1 | 1 | 1 | 1 | 0 | 1 | 1 |
Best forecast wave conditions in Guanacaste | |||||||||||||||||||||
Best forecast wave conditions in Costa Rica | |||||||||||||||||||||
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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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