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Avellanas Rivermouth Surf Forecast
/ Guanacaste (28 surf breaks) /
Avellanas Rivermouth surfForecast / Guanacaste / Costa Rica
12 Day Weather and Surf, issued 5 am Monday 31 Mar 2025 CST
Best Forecast Surf Conditions for Avellanas Rivermouth this week:
The surf forecast for Avellanas Rivermouth over the next 12 days: The first swell (rated 1 star or higher) is forecast to arrive on Monday (Mar 31) at 9AM. The primary swell is predicted to be 0.7m and 17s period with a secondary swell of 0.7m and 13s. The wind is predicted to be onshore as the swell arrives.
The most powerful waves expected at Avellanas Rivermouth in the next 12 days are 1.0m 14s and forecast to arrive on Thursday (Apr 03) at 12AM. Winds are predicted to be onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.4m 3s period and expected on Friday (Apr 04) at 3PM.
| Wave Type | Time (CST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 9AM (Mon 31st Mar) | 2.5ft (0.7m) 17s |
| Best Surf | 12PM (Mon 31st Mar) | 2.5ft (0.7m) 16s |
| Most Powerful | 12AM (Thu 3rd Apr) | 3.5ft (1.0m) 14s |
Table - best surf conditions forecast for Avellanas Rivermouth over the next 12 days.
Monday 31 | Tuesday 01 | Wednesday 02 | Thursday 03 | Friday 04 | Saturday 05 | Sunday 06 | Monday 07 | Tuesday 08 | Wednesday 09 | Thursday 10 | Friday 11 | |||||||||||||||||||||||||
| AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | 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) (?) | 17 | 13 | 16 | 16 | 16 | 14 | 15 | 15 | 14 | 14 | 13 | 13 | 14 | 13 | 12 | 11 | 12 | 12 | 11 | 11 | 16 | 12 | 15 | 15 | 14 | 13 | 13 | 13 | 20 | 19 | 18 | 18 | 16 | 16 | 16 | 16 |
Wave (?)Graph  | ||||||||||||||||||||||||||||||||||||
| Energy (?) | 288 | 170 | 173 | 358 | 291 | 206 | 326 | 339 | 394 | 389 | 201 | 195 | 102 | 127 | 101 | 127 | 232 | 224 | 147 | 149 | 258 | 177 | 255 | 217 | 186 | 183 | 140 | 134 | 130 | 513 | 404 | 703 | 886 | 853 | 945 | 811 |
Wind (km/h) | ||||||||||||||||||||||||||||||||||||
| Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy | on | cross- off | glass | on | off | on | cross- on | cross- off | on | cross- on | cross- off | on | cross- on | cross- off | on | on | cross- off | on | on | cross- off | glass | cross- on | off | glass | on | cross- off | cross- on | cross- on | cross- off | on | cross- on | cross- on | on | cross- on | cross- on | cross- on |
High Tide / height (m) | 4:08PM 2.86 | 4:36AM 2.56 | 4:55PM 2.82 | 5:24AM 2.48 | 5:43PM 2.69 | 6:15AM 2.36 | 6:34PM 2.51 | 7:09AM 2.20 | 7:30PM 2.31 | 8:10AM 2.05 | 8:33PM 2.12 | 9:20AM 1.95 | 9:45PM 2.00 | 10:35AM 1.93 | 10:59PM 1.95 | 11:43AM 1.98 | 12:05AM 1.97 | 12:38PM 2.07 | 12:59AM 2.03 | 1:23PM 2.18 | 1:43AM 2.09 | 2:01PM 2.27 | 2:23AM 2.16 | |||||||||||||
Low Tide / height (m) | 9:52AM -0.01 | 10:28PM -0.11 | 10:39AM 0.01 | 11:15PM -0.07 | 11:27AM 0.10 | 12:05AM 0.05 | 12:18PM 0.24 | 12:58AM 0.21 | 1:14PM 0.41 | 1:56AM 0.38 | 2:17PM 0.58 | 3:02AM 0.52 | 3:30PM 0.70 | 4:14AM 0.61 | 4:47PM 0.74 | 5:22AM 0.62 | 5:56PM 0.70 | 6:20AM 0.59 | 6:52PM 0.61 | 7:07AM 0.55 | 7:38PM 0.51 | 7:48AM 0.49 | 8:17PM 0.41 | |||||||||||||
Monday 31 | Tuesday 01 | Wednesday 02 | Thursday 03 | Friday 04 | Saturday 05 | Sunday 06 | Monday 07 | Tuesday 08 | Wednesday 09 | Thursday 10 | Friday 11 | |||||||||||||||||||||||||
| Sunrise | 5:41 | - | - | 5:39 | - | - | 5:39 | - | - | 5:39 | - | - | 5:39 | - | - | 5:37 | - | - | 5:37 | - | - | 5:37 | - | - | 5:35 | - | - | 5:35 | - | - | 5:35 | - | - | 5:35 | - | - |
| Sunset | - | 5:53 | - | - | 5:53 | - | - | 5:52 | - | - | 5:52 | - | - | 5:52 | - | - | 5:52 | - | - | 5:52 | - | - | 5:52 | - | - | 5:52 | - | - | 5:52 | - | - | 5:52 | - | - | 5:52 | - |
 |  |  |  | |  | | | | | | | | | | |  | | | | | | | | | | | | | | | |  | | | | |
Rain (mm) | - | 1 | 7 | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | 1 | - | - | 3 | - | - | - | - | - | - | - | - | - | - | - | - |
| Temp. °C | 31 | 29 | 28 | 31 | 30 | 28 | 31 | 29 | 28 | 31 | 29 | 28 | 32 | 29 | 29 | 31 | 29 | 29 | 30 | 29 | 28 | 31 | 29 | 28 | 30 | 29 | 28 | 32 | 29 | 29 | 33 | 32 | 28 | 32 | 33 | 28 |
| Feels °C (?) | 32 | 30 | 31 | 33 | 30 | 32 | 32 | 29 | 31 | 32 | 29 | 31 | 34 | 30 | 32 | 33 | 30 | 33 | 31 | 31 | 31 | 32 | 30 | 32 | 31 | 30 | 32 | 35 | 30 | 30 | 32 | 33 | 26 | 29 | 31 | 25 |
Short Range Forecast: Light rain (total 8mm), mostly falling on Mon night. Warm (max 31°C on Mon morning, min 24°C on Tue night). Wind will be generally light. | Days 3-6 Weather Summary Mostly dry. Warm (max 32°C on Fri morning, min 25°C on Thu night). Wind will be generally light. | Days 6-9 Weather Summary Light rain (total 4mm), mostly falling on Sun night. Warm (max 31°C on Mon morning, min 26°C on Sun night). Wind will be generally light. | Long Range Forecast: Mostly dry. Warm (max 33°C on Thu morning, min 26°C on Wed night). Winds increasing (calm on Wed morning, fresh winds from the NE by Sat morning). | |||||||||||||||||||||||||||||||||
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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 12 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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