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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 pm Friday 04 Jul 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 Friday (Jul 04) at 9PM. The primary swell is predicted to be 1.0m and 14s period with a secondary swell of 0.8m and 10s. The wind is predicted to be glassy as the swell arrives.
The most powerful waves expected at Avellanas Rivermouth in the next 12 days are 1.4m 16s and forecast to arrive on Sunday (Jul 06) at 6AM. Winds are predicted to be onshore at the time the swell arrives.
| Wave Type | Time (CST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 9PM (Fri 4th Jul) | 3.5ft (1.0m) 14s |
| Best Surf | 9PM (Fri 4th Jul) | 3.5ft (1.0m) 14s |
| Most Powerful | 6AM (Sun 6th Jul) | 4.5ft (1.4m) 16s |
Table - best surf conditions forecast for Avellanas Rivermouth over the next 12 days.
Fri 04 | Saturday 05 | Sunday 06 | Monday 07 | Tuesday 08 | Wednesday 09 | Thursday 10 | Friday 11 | Saturday 12 | Sunday 13 | Monday 14 | Tuesday 15 | Wed 16 | ||||||||||||||||||||||||
| 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 | AM | |
Rating (10 max) | ||||||||||||||||||||||||||||||||||||
Swell Height Map |  |  |  |  |  |  |  |  |  |  |  |  |  | |||||||||||||||||||||||
| Wave Height (m) & direction (?) | ||||||||||||||||||||||||||||||||||||
| Period(s) (?) | 14 | 14 | 18 | 17 | 16 | 16 | 15 | 14 | 14 | 14 | 13 | 13 | 13 | 13 | 12 | 12 | 13 | 12 | 17 | 16 | 16 | 16 | 15 | 15 | 15 | 14 | 14 | 14 | 14 | 13 | 11 | 11 | 11 | 11 | 16 | 16 |
Wave (?)Graph  | ||||||||||||||||||||||||||||||||||||
| Energy (?) | 672 | 562 | 730 | 837 | 912 | 991 | 896 | 672 | 525 | 435 | 291 | 344 | 291 | 246 | 245 | 233 | 299 | 303 | 377 | 307 | 330 | 614 | 539 | 553 | 520 | 480 | 483 | 424 | 636 | 537 | 518 | 581 | 514 | 578 | 753 | 597 |
Wind (km/h) | ||||||||||||||||||||||||||||||||||||
| Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy | off | cross- on | glass | cross- off | on | glass | off | glass | glass | cross- off | on | on | on | on | on | glass | glass | cross- on | cross- off | cross- on | on | cross- off | on | cross- on | cross- off | cross- on | glass | cross | on | on | glass | cross- on | on | on | cross- on | cross- on |
High Tide / height (m) | 9:50PM 1.78 | 10:13AM 2.05 | 10:49PM 1.75 | 11:07AM 2.04 | 11:47PM 1.75 | 12:00PM 2.06 | 12:42AM 1.79 | 12:51PM 2.11 | 1:32AM 1.86 | 1:39PM 2.18 | 2:18AM 1.94 | 2:23PM 2.25 | 3:01AM 2.04 | 3:06PM 2.31 | 3:42AM 2.14 | 3:47PM 2.34 | 4:22AM 2.23 | 4:27PM 2.36 | 5:01AM 2.32 | 5:09PM 2.34 | 5:42AM 2.38 | 5:52PM 2.29 | 6:24AM 2.42 | |||||||||||||
Low Tide / height (m) | 3:51PM 0.70 | 3:50AM 0.75 | 4:48PM 0.70 | 4:45AM 0.78 | 5:44PM 0.66 | 5:41AM 0.78 | 6:36PM 0.60 | 6:34AM 0.74 | 7:25PM 0.52 | 7:24AM 0.68 | 8:09PM 0.43 | 8:10AM 0.61 | 8:50PM 0.36 | 8:54AM 0.55 | 9:29PM 0.29 | 9:37AM 0.50 | 10:07PM 0.24 | 10:20AM 0.45 | 10:45PM 0.22 | 11:03AM 0.42 | 11:23PM 0.22 | 11:48AM 0.41 | 12:03AM 0.25 | |||||||||||||
Fri 04 | Saturday 05 | Sunday 06 | Monday 07 | Tuesday 08 | Wednesday 09 | Thursday 10 | Friday 11 | Saturday 12 | Sunday 13 | Monday 14 | Tuesday 15 | Wed 16 | ||||||||||||||||||||||||
| Sunrise | - | - | 5:26 | - | - | 5:26 | - | - | 5:26 | - | - | 5:26 | - | - | 5:26 | - | - | 5:28 | - | - | 5:28 | - | - | 5:28 | - | - | 5:28 | - | - | 5:28 | - | - | 5:28 | - | - | 5:28 |
| Sunset | 6:07 | - | - | 6:08 | - | - | 6:08 | - | - | 6:08 | - | - | 6:08 | - | - | 6:08 | - | - | 6:08 | - | - | 6:08 | - | - | 6:08 | - | - | 6:08 | - | - | 6:08 | - | - | 6:08 | - | - |
 |  | |  |  |  | | | | | |  |  |  | | | | | | | | | | | | | | | | | | | | | | | |
Rain (mm) | 11 | 14 | 4 | 10 | - | 1 | 8 | 4 | 5 | 10 | 1 | - | - | - | - | 1 | - | - | 4 | 1 | 1 | 13 | 1 | - | 7 | 7 | - | 8 | 1 | - | 4 | - | - | - | - | - |
| Temp. °C | 27 | 26 | 27 | 26 | 25 | 28 | 28 | 26 | 28 | 27 | 25 | 29 | 29 | 26 | 29 | 30 | 26 | 29 | 28 | 26 | 28 | 28 | 26 | 29 | 28 | 25 | 28 | 27 | 25 | 29 | 29 | 25 | 28 | 30 | 26 | 29 |
| Feels °C (?) | 31 | 30 | 31 | 30 | 29 | 32 | 32 | 29 | 33 | 31 | 26 | 28 | 28 | 28 | 32 | 34 | 30 | 33 | 31 | 30 | 32 | 32 | 29 | 32 | 31 | 28 | 31 | 31 | 28 | 34 | 33 | 24 | 29 | 32 | 28 | 30 |
Short Range Forecast: Heavy rain (total 57mm), heaviest during Fri night. Warm (max 28°C on Sun morning, min 24°C on Fri night). Wind will be generally light. | Days 3-6 Weather Summary Moderate rain (total 12mm), heaviest on Mon afternoon. Warm (max 30°C on Wed afternoon, min 24°C on Mon night). Wind will be generally light. | Days 6-9 Weather Summary Heavy rain (total 34mm), heaviest during Fri afternoon. Warm (max 29°C on Sat morning, min 24°C on Thu night). Wind will be generally light. | Long Range Forecast: Moderate rain (total 13mm), heaviest on Sun afternoon. Warm (max 30°C on Tue afternoon, min 24°C on Mon night). Wind will be generally light. | |||||||||||||||||||||||||||||||||
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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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