Surf Forecasts:
Avellanas Rivermouth surf forecast from 31 Jul 2026:
- Best quality surf: Friday 31 Jul, 3PM (local time) - 3.5ft (1.0m), 13s period, SW swell with cross-offshore winds.
- Most powerful swell: Friday 31 Jul, 3PM (local time) - 3.5ft (1.0m), 13s period, SW swell with 342 kJ wave energy.
- Next surfable swell (1★+): Friday 31 Jul, 3PM (local time) - 3.5ft (1.0m), 13s 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 (Jul 31) at 3PM. The primary swell is predicted to be 1.0m and 13s period with a secondary swell of 0.4m and 7s. 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 1.0m 13s and forecast to arrive on Friday (Jul 31) at 3PM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.5m 5s period and expected on Saturday (Aug 01) at 6PM.
| Wave Type | Time (CST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 3PM (Fri 31st Jul) | 3.5ft (1.0m) 13s |
| Best Surf | 3PM (Fri 31st Jul) | 3.5ft (1.0m) 13s |
| Most Powerful | 3PM (Fri 31st Jul) | 3.5ft (1.0m) 13s |
Table - best surf conditions forecast for Avellanas Rivermouth over the next 16 days.
The Lowdown
Alright, grab a coffee and listen up. Let's talk about Avellanas Rivermouth for the next couple of weeks. We've got a bit of a mixed bag here, but there are a few windows that are well worth watching.
The overall pattern shows persistent SW swell running through the whole period, mostly in the 2ft to 4ft range. The problem is the wind. Mornings are almost a write-off, with strong ENE cross-onshore winds that make the surface lumpy and messy. The saving grace is the afternoon shift. When that wind swings SW or SSW and goes light, or even glassy, that's when this spot comes to life.
The best bet for a true standout session is Saturday, August 8th in the afternoon. The wind will be light and cross-off from the SW, with the swell coming clean at 4ft from the SW. That's the biggest swell of the run and it’ll be clean. The energy is strong, and with that light cross-off, the sandbar setup should be really fun. This is the one to circle on the calendar.
Right now, this Friday afternoon (July 31st) isn't bad either. We've got a 3ft SW swell with a light cross-off wind. The wave energy is strong, and conditions will be clean. It’s not the biggest, but it’s clean and right in front of us.
If you're looking further out, the afternoon of Wednesday, August 12th looks promising. The wind goes light cross-off, with a 3ft SW swell and a very solid wave energy of 594. It's a long-range look, so we treat it with a bit more caution, but the ingredients are there for a fun session.
Towards the end of the run, the mornings continue to suffer from strong ENE winds, but there are a couple of afternoons that clean up. The 9th of August afternoon has a 3ft SW swell with glassy conditions, though the energy drops a bit. The 15th of August afternoon shows some potential, but the wind stays cross-on, so it'll be choppier.
For the mornings in between, forget it. The wind is mostly onshore or cross-on, chopping up the 2ft to 3ft swells. The water temp isn't mentioned in the file for this specific spot, so we won't guess. Just know the afternoon windows are the game here.
Stay on it.
- Rusty
Short Range ForecastMostly dry. Warm (max 32°C on Fri morning, min 25°C on Thu night). Wind will be generally light. | Days 5-7 Weather SummaryHeavy rain (total 28mm), heaviest during Mon night. Warm (max 31°C on Wed morning, min 26°C on Sun night). Wind will be generally light. | ||||||||||||||||||
Friday 31 | Saturday 1 | Sunday 2 | Monday 3 | Tuesday 4 | Wednesday 5 | ||||||||||||||
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 14 | SW 14 | SW 13 | SW 13 | SW 13 | SW 13 | SW 12 | SW 15 | SW 15 | SW 14 | SW 14 | SW 13 | SW 13 | SW 13 | SSW 8 | SW 12 | S 8 | SW 12 | SW 14 |
Wave Graph  | |||||||||||||||||||
 kJ | 485 | 357 | 342 | 326 | 238 | 234 | 147 | 108 | 171 | 167 | 231 | 208 | 84 | 108 | 96 | 93 | 65 | 49 | 73 |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | cross-on | cross-off | cross-on | cross-on | cross | on | on | cross-off | on | cross-on | cross-off | glassy | cross-on | cross-off | on | cross-on | cross-off | glassy |
High Tide | 3:52AM2.22m | 3:58PM2.30m | 4:27AM2.30m | 4:35PM2.29m | 5:02AM2.35m | 5:11PM2.26m | 5:37AM2.38m | 5:50PM2.20m | 6:15AM2.39m | 6:30PM2.13m | 6:56AM2.37m | 7:16PM2.04m | |||||||
Low Tide | 9:38PM0.31m | 9:52AM0.48m | 10:12PM0.28m | 10:30AM0.44m | 10:46PM0.28m | 11:08AM0.42m | 11:19PM0.30m | 11:47AM0.42m | 11:55PM0.34m | 12:29PM0.43m | 00:34AM0.39m | 1:15PM0.45m | 1:19AM0.45m | ||||||
 |  | | |  | | | | |  | |  |  |  | | | | | | |
 | — | 5:31 | — | — | 5:31 | — | — | 5:31 | — | — | 5:31 | — | — | 5:33 | — | — | 5:33 | — | — |
 | — | — | 6:06 | — | — | 6:06 | — | — | 6:06 | — | — | 6:06 | — | — | 6:05 | — | — | 6:05 | — |
mm | — | — | — | — | — | — | — | — | — | 6 | — | 2 | 6 | 1 | 5 | 1 | — | 7 | 5 |
Temp °C | 28 | 32 | 29 | 27 | 32 | 31 | 28 | 31 | 30 | 28 | 30 | 29 | 26 | 30 | 29 | 28 | 31 | 28 | 27 |
Feels °C | 29 | 36 | 32 | 29 | 32 | 33 | 28 | 34 | 32 | 31 | 33 | 31 | 30 | 33 | 33 | 32 | 35 | 31 | 32 |
Swell 1 Height (m) Direction Period (s) | SW 14 | SW 14 | SW 13 | SW 13 | SW 13 | SW 13 | SW 12 | SW 12 | SW 15 | S 7 | SW 14 | SW 13 | S 8 | S 8 | SSW 8 | S 8 | S 8 | S 8 | S 8 |
| kJ | 485 | 357 | 342 | 326 | 238 | 234 | 147 | 108 | 171 | 52 | 231 | 208 | 80 | 74 | 96 | 71 | 65 | 47 | 65 |
Swell 2 Height (m) Direction Period (s) | S 6 | S 7 | S 7 | S 7 | S 12 | N 5 | SW 16 | S 12 | SSW 11 | SW 14 | S 7 | S 7 | SW 13 | SW 13 | SW 12 | SW 12 | SW 12 | SW 12 | NNE 5 |
| kJ | 12 | 15 | 16 | 17 | 72 | 7 | 124 | 65 | 85 | 167 | 66 | 66 | 83 | 108 | 73 | 93 | 50 | 49 | 7 |
Swell 3 Height (m) Direction Period (s) | WNW 11 | WNW 11 | N 4 | WNW 11 | WNW 12 | SW 16 | S 7 | SW 15 | S 7 | SW 12 | WSW 13 | SW 16 | SW 13 | SW 10 | SW 16 | SW 7 | SW 7 | SW 6 | SW 14 |
| kJ | 25 | 25 | 6 | 24 | 27 | 66 | 14 | 104 | 33 | 116 | 69 | 66 | 84 | 15 | 61 | 17 | 11 | 14 | 73 |
Wind waves Height (m) Direction Period (s) | NNE 4 | NNE 5 | — | NNE 5 | N 5 | — | NNE 5 | NE 3 | — | — | — | — | — | — | — | NE 4 | NNE 3 | — | — |
| kJ | 8 | 5 | — | 13 | 16 | — | 8 | 2 | — | — | — | — | — | — | — | 4 | 1 | — | — |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 1 | 19 | 0 | 7 | 19 | 7 | 1 | 1 | 0 | 1 | 1 | 8 | 0 | 1 | 0 | 1 | 7 | 0 | 0 |
Best forecast wave conditions in Guanacaste | |||||||||||||||||||
Best forecast wave conditions in Costa Rica | |||||||||||||||||||
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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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