Surf Forecasts:
Avellanas Rivermouth surf forecast from 19 Jun 2026:
- Best quality surf: Friday 26 Jun, 12PM (local time) - 4ft (1.2m), 18s period, SW swell with glassy winds.
- Most powerful swell: Wednesday 24 Jun, 9AM (local time) - 4.5ft (1.4m), 16s period, SW swell with 952 kJ wave energy.
- Next surfable swell (1★+): Friday 19 Jun, 12PM (local time) - 3.5ft (1.1m), 17s period with SW 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 Friday (Jun 19) at 12PM. The primary swell is predicted to be 1.1m and 17s period with a secondary swell of 0.7m and 12s. 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 1.4m 16s and forecast to arrive on Wednesday (Jun 24) at 9AM. 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+) | 12PM (Fri 19th Jun) | 3.5ft (1.1m) 17s |
| Best Surf | 12PM (Fri 26th Jun) | 4ft (1.2m) 18s |
| Most Powerful | 9AM (Wed 24th Jun) | 4.5ft (1.4m) 16s |
Table - best surf conditions forecast for Avellanas Rivermouth over the next 16 days.
Updates in hr min s Forecast update imminent
Short Range ForecastHeavy rain (total 25mm), heaviest during Sun night. Warm (max 30°C on Fri morning, min 25°C on Fri night). Wind will be generally light. | Days 4-6 Weather SummaryHeavy rain (total 32mm), heaviest during Mon afternoon. Warm (max 29°C on Mon morning, min 23°C on Wed night). Wind will be generally light. | ||||||||||||||||||||
Friday 19 | Saturday 20 | Sunday 21 | Monday 22 | Tuesday 23 | Wednesday 24 | Thursday 25 | |||||||||||||||
AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | |
Swell Height Map |  |  |  |  |  |  |  | ||||||||||||||
Wave Height (m) Direction Period (s) | SW 16 | SW 17 | SW 15 | SW 16 | SW 15 | SW 15 | SW 14 | SW 18 | SW 18 | SW 16 | SW 16 | SW 16 | SW 18 | SW 18 | SW 16 | SW 16 | SW 16 | SW 15 | SW 16 | SW 16 | SW 16 |
Wave Graph  | |||||||||||||||||||||
 kJ | 504 | 751 | 744 | 783 | 666 | 606 | 528 | 387 | 375 | 314 | 427 | 574 | 338 | 905 | 875 | 952 | 906 | 605 | 636 | 636 | 653 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | cross-off | glassy | cross-on | cross-off | cross-on | glassy | cross-off | glassy | cross-on | glassy | on | cross-on | on | on | cross-on | on | cross-on | on | cross-on | on |
High Tide | 6:04PM2.46m | 6:42AM2.46m | 6:58PM2.31m | 7:35AM2.39m | 7:53PM2.15m | 8:28AM2.31m | 8:50PM2.01m | 9:22AM2.23m | 9:50PM1.91m | 10:16AM2.16m | 10:50PM1.84m | 11:09AM2.12m | 11:48PM1.82m | ||||||||
Low Tide | 11:57AM0.26m | 00:22AM0.10m | 12:53PM0.36m | 1:13AM0.24m | 1:50PM0.46m | 2:04AM0.39m | 2:49PM0.54m | 2:58AM0.53m | 3:49PM0.59m | 3:53AM0.63m | 4:47PM0.61m | 4:49AM0.70m | 5:43PM0.60m | ||||||||
 |  |  |  | |  | | | | | | |  | | | | |  |  | | | |
 | 5:22 | — | — | 5:22 | — | — | 5:22 | — | — | 5:22 | — | — | 5:22 | — | — | 5:24 | — | — | 5:24 | — | — |
 | — | 6:06 | — | — | 6:06 | — | — | 6:06 | — | — | 6:07 | — | — | 6:07 | — | — | 6:07 | — | — | 6:07 | — |
mm | — | 3 | 1 | 1 | 2 | 1 | 2 | 3 | 12 | 2 | 13 | 1 | — | — | 16 | — | — | — | — | 1 | — |
Temp °C | 30 | 29 | 28 | 30 | 29 | 27 | 28 | 28 | 27 | 29 | 27 | 26 | 27 | 28 | 26 | 28 | 27 | 25 | 29 | 29 | 26 |
Feels °C | 35 | 33 | 32 | 35 | 32 | 31 | 33 | 31 | 31 | 33 | 31 | 28 | 28 | 29 | 29 | 31 | 27 | 27 | 28 | 30 | 29 |
Swell 1 Height (m) Direction Period (s) | SW 16 | SW 17 | SW 15 | SW 16 | SW 15 | SW 15 | SW 14 | SW 14 | SW 14 | SW 16 | SW 16 | SW 16 | SW 15 | SW 18 | SW 16 | SW 16 | SW 16 | SW 15 | SW 16 | SW 16 | SW 16 |
| kJ | 504 | 751 | 744 | 783 | 666 | 606 | 528 | 387 | 257 | 314 | 427 | 574 | 266 | 905 | 875 | 952 | 906 | 605 | 636 | 636 | 653 |
Swell 2 Height (m) Direction Period (s) | SSW 12 | SSW 12 | SSW 11 | SSW 10 | SSW 11 | SW 20 | S 10 | SW 18 | SW 18 | SW 13 | SW 13 | S 7 | S 7 | S 8 | S 8 | S 8 | S 8 | S 16 | S 8 | S 8 | S 7 |
| kJ | 189 | 107 | 93 | 43 | 46 | 134 | 52 | 375 | 375 | 171 | 168 | 38 | 53 | 57 | 63 | 46 | 43 | 183 | 40 | 41 | 27 |
Swell 3 Height (m) Direction Period (s) | S 13 | S 13 | S 12 | S 12 | S 11 | N 5 | SW 19 | S 10 | S 10 | S 9 | S 9 | SSW 20 | SW 18 | SW 12 | SSW 19 | S 18 | S 18 | S 8 | S 16 | S 15 | SSW 14 |
| kJ | 31 | 53 | 26 | 43 | 38 | 7 | 129 | 31 | 48 | 61 | 76 | 253 | 338 | 52 | 118 | 99 | 99 | 28 | 177 | 112 | 66 |
Wind waves Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | NNE 4 | — | N 4 | — | — | — | NE 4 | — | — | NNE 3 |
| kJ | — | — | — | — | — | — | — | — | — | — | — | 6 | — | 3 | — | — | — | 4 | — | — | 3 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 1 | 0 | 0 | 1 | 0 | 1 | 0 | 0 | 0 | 1 | 0 | 1 | 1 | 1 | 1 | 1 | 1 | 10 | 1 | 4 | 1 |
Best forecast wave conditions in Guanacaste | |||||||||||||||||||||
Best forecast wave conditions in Costa Rica | |||||||||||||||||||||
Header Global | |||||||||||||||||||||
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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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