Buy Less, Surf More This Black Friday
Surf-forecast is providing a free, all-access pass to our premium features and 12-day forecasts all weekend.
- Forecast
- Maps
- Live
- Weather State
- Spot Information
Avellanas Rivermouth Surf Forecast
/ Guanacaste (28 surf breaks) /
Surf Forecasts:
Avellanas Rivermouth surfForecast / Guanacaste / Costa Rica
12 Day Weather and Surf, issued 11 pm Tuesday 25 Nov 2025 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
28.2° C
(Which is 1.0°C warmer than normal for this time of year)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 Sunday (Nov 30) at 12PM. The primary swell is predicted to be 0.7m and 12s period with a secondary swell of 0.8m and 7s. 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 0.7m 13s and forecast to arrive on Thursday (Nov 27) at 3PM. 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 (Sun 30th Nov) | 2.5ft (0.7m) 12s |
| Best Surf | 12PM (Sun 30th Nov) | 2.5ft (0.7m) 12s |
| Most Powerful | 3PM (Thu 27th Nov) | 2.5ft (0.7m) 13s |
Table - best surf conditions forecast for Avellanas Rivermouth over the next 12 days.
Updates in hr min s Forecast update imminent
Short Range Forecast Mostly dry. Warm (max 29°C on Wed morning, min 23°C on Thu night). Wind will be generally light. | Days 3-6 Weather Summary Mostly dry. Warm (max 29°C on Sat afternoon, min 23°C on Fri night). Wind will be generally light. | |||||||||||||||||||||
Wednesday 26 | Thursday 27 | Friday 28 | Saturday 29 | Sunday 30 | Monday 01 | Tue 02 | ||||||||||||||||
| Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | ||
Rating (10 max) | ||||||||||||||||||||||
Swell Height Map |  |  |  |  |  |  |  |  | ||||||||||||||
| Wave Height (m) & direction (?) | ||||||||||||||||||||||
| Period(s) (?) | 16 | 15 | 15 | 14 | 13 | 13 | 13 | 13 | 12 | 14 | 13 | 13 | 13 | 12 | 12 | 15 | 12 | 14 | 14 | 13 | 12 | |
Wave (?)Graph  | ||||||||||||||||||||||
 kJ (?) | 64 | 106 | 171 | 167 | 144 | 178 | 178 | 175 | 122 | 96 | 162 | 170 | 132 | 152 | 147 | 76 | 74 | 160 | 72 | 130 | 75 | |
Wind (km/h) | ||||||||||||||||||||||
| Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy | on | cross- on | cross- on | cross- on | cross- on | cross- on | cross- on | cross- on | cross- on | cross- on | on | on | on | on | off | glass | cross- on | cross- off | on | glass | glass | |
High Tide / height (m) | 6:07AM 2.10 | 6:47PM 2.00 | 6:51AM 2.02 | 7:34PM 2.01 | 7:42AM 1.96 | 8:26PM 2.06 | 8:41AM 1.91 | 9:22PM 2.14 | 9:47AM 1.91 | 10:21PM 2.25 | 10:53AM 1.96 | 11:20PM 2.38 | 11:56AM 2.06 | |||||||||
Low Tide / height (m) | 11:59PM 0.68 | 12:28PM 0.49 | 12:45AM 0.73 | 1:10PM 0.55 | 1:38AM 0.76 | 1:58PM 0.59 | 2:39AM 0.74 | 2:53PM 0.61 | 3:45AM 0.67 | 3:52PM 0.59 | 4:50AM 0.54 | 4:54PM 0.53 | 5:51AM 0.38 | 5:55PM 0.43 | ||||||||
Wednesday 26 | Thursday 27 | Friday 28 | Saturday 29 | Sunday 30 | Monday 01 | Tue 02 | ||||||||||||||||
| Sunrise | - | 5:41 | - | - | 5:43 | - | - | 5:43 | - | - | 5:43 | - | - | 5:43 | - | - | 5:45 | - | - | 5:45 | - | |
| Sunset | - | - | 5:17 | - | - | 5:17 | - | - | 5:17 | - | - | 5:17 | - | - | 5:19 | - | - | 5:19 | - | - | 5:19 | |
 |  | | | | | | | | | | | | | | |  | |  |  |  | ||
Rain (mm) | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | 1 | 1 | 8 | |
| Temp. °C | 26 | 29 | 29 | 26 | 29 | 29 | 26 | 28 | 28 | 25 | 28 | 29 | 25 | 28 | 28 | 25 | 29 | 27 | 26 | 28 | 26 | |
| Feels °C (?) | 31 | 30 | 30 | 26 | 29 | 30 | 26 | 28 | 29 | 25 | 28 | 31 | 26 | 32 | 31 | 28 | 32 | 29 | 29 | 32 | 30 | |
- Map Icons:
Break
Live Wave Height (m)
Live Wind Speed (km/h)
Surf Rating (10 Max)
Ocean Swells (m)- Wind Speed (km/h)
Latest Updates
Quiksilver Teams Up With PrimaLoft® For World’s First Thermal Layering System for a Wetsuit.
Previously used in our snow jackets for mountain conditions, PrimaLoft® technology is making its debut in the surf industry. The aim is to bring mountain-grade warmth to the waves.
Vancouver Island’s Day Of Days With Reed Platenius
Surf-Forecast recently helped the 21-year-old Canadian pro surfer and adventurer score some cold water perfection at home.
5 Reasons Why Costa Rica Is A Surfer (and Non Surfer) Paradise
With or without a surfboard, Costa Rica is a bucket list destination that has shown what a nation is capable of when nature is put first.
Read more
Discover more articles and updates in the Greenroom.
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.
Nearest