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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 Tuesday 24 Mar 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
28.4° C
(Which is slightly warmer than usual)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 Tuesday (Mar 24) at 12PM. The primary swell is predicted to be 0.6m and 18s period with a secondary swell of 0.6m and 13s. Another secondary swell of 0.6m and 4s is also forecast. 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 1.4m 15s and forecast to arrive on Tuesday (Mar 31) at 9AM. Winds are predicted to be onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.7m 4s period and expected on Tuesday (Mar 24) at 3PM.
| Wave Type | Time (CST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 12PM (Tue 24th Mar) | 2ft (0.6m) 18s |
| Best Surf | 12PM (Tue 31st Mar) | 4.5ft (1.4m) 15s |
| Most Powerful | 9AM (Tue 31st Mar) | 4.5ft (1.4m) 15s |
Table - best surf conditions forecast for Avellanas Rivermouth over the next 16 days.
Updates in hr min s Forecast update imminent
Short Range Forecast Mostly dry. Warm (max 32°C on Thu morning, min 24°C on Tue night). Wind will be generally light. | Days 3-6 Weather Summary Mostly dry. Warm (max 32°C on Sat morning, min 25°C on Fri night). Mainly fresh winds. | ||||||||||||||||||||
Tuesday 24 | Wednesday 25 | Thursday 26 | Friday 27 | Saturday 28 | Sunday 29 | Monday 30 | |||||||||||||||
| AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | |
Rating (10 max) | |||||||||||||||||||||
Swell Height Map |  |  |  |  |  |  |  | ||||||||||||||
| Wave Height (m) & direction (?) | |||||||||||||||||||||
| Period(s) (?) | 18 | 18 | 16 | 16 | 16 | 15 | 15 | 15 | 14 | 14 | 14 | 13 | 10 | 9 | 17 | 15 | 16 | 15 | 18 | 17 | 16 |
Wave (?)Graph  | |||||||||||||||||||||
 kJ (?) | 252 | 154 | 129 | 208 | 125 | 107 | 104 | 104 | 102 | 100 | 68 | 85 | 65 | 58 | 138 | 298 | 502 | 648 | 416 | 481 | 636 |
Wind (km/h) | |||||||||||||||||||||
| Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy | cross- on | off | on | cross- on | off | glass | cross- on | cross- off | on | cross- on | cross- off | on | cross- on | cross- off | on | cross- on | cross | on | cross- on | cross- off | on |
High Tide / height (m) | 6:43PM 2.47 | 7:16AM 2.15 | 7:39PM 2.32 | 8:19AM 2.04 | 8:45PM 2.17 | 9:32AM 1.97 | 10:00PM 2.08 | 10:50AM 1.99 | 11:17PM 2.07 | 12:00PM 2.09 | 12:24AM 2.12 | 12:58PM 2.22 | 1:20AM 2.19 | ||||||||
Low Tide / height (m) | 12:25PM 0.29 | 1:06AM 0.27 | 1:20PM 0.42 | 2:06AM 0.40 | 2:25PM 0.56 | 3:15AM 0.50 | 3:41PM 0.65 | 4:30AM 0.54 | 5:01PM 0.65 | 5:40AM 0.51 | 6:12PM 0.57 | 6:39AM 0.45 | 7:11PM 0.46 | ||||||||
Tuesday 24 | Wednesday 25 | Thursday 26 | Friday 27 | Saturday 28 | Sunday 29 | Monday 30 | |||||||||||||||
| Sunrise | 5:45 | - | - | 5:43 | - | - | 5:43 | - | - | 5:43 | - | - | 5:43 | - | - | 5:41 | - | - | 5:41 | - | - |
| Sunset | - | 5:53 | - | - | 5:53 | - | - | 5:53 | - | - | 5:53 | - | - | 5:53 | - | - | 5:53 | - | - | 5:53 | - |
 | |  | | | | | | | | | | | | | |  | | | | | |
Rain (mm) | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - |
| Temp. °C | 31 | 31 | 27 | 31 | 31 | 28 | 32 | 30 | 28 | 31 | 31 | 29 | 32 | 30 | 28 | 32 | 31 | 29 | 32 | 30 | 28 |
| Feels °C (?) | 31 | 32 | 27 | 31 | 32 | 29 | 32 | 29 | 30 | 31 | 32 | 29 | 32 | 30 | 25 | 30 | 32 | 27 | 31 | 30 | 26 |
- 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 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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