
Surf Forecasts:
Las Avellanas surf forecast from 28 Jul 2026:
- Best quality surf: Tuesday 28 Jul, 9PM (local time) - 5.5ft (1.7m), 16s period, SW swell with cross-offshore winds.
- Most powerful swell: Tuesday 28 Jul, 3PM (local time) - 5.5ft (1.7m), 17s period, SW swell with 1,682 kJ wave energy.
- Next surfable swell (1★+): Tuesday 28 Jul, 9PM (local time) - 5.5ft (1.7m), 16s period with SW swell.
Best Forecast Surf Conditions for Las Avellanas this week:
The surf forecast for Las Avellanas over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Tuesday (Jul 28) at 9PM. The primary swell is predicted to be 1.7m and 16s period. The wind is predicted to be cross-offshore as the swell arrives.
The most powerful waves expected at Las Avellanas in the next 16 days are 1.7m 17s and forecast to arrive on Tuesday (Jul 28) at 3PM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.8m 7s period and expected on Monday (Aug 03) at 9PM.
| Wave Type | Time (CST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 9PM (Tue 28th Jul) | 5.5ft (1.7m) 16s |
| Best Surf | 9PM (Tue 28th Jul) | 5.5ft (1.7m) 16s |
| Most Powerful | 3PM (Tue 28th Jul) | 5.5ft (1.7m) 17s |
Table - best surf conditions forecast for Las Avellanas over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let’s have a look at what’s coming down the pipe for Las Avellanas.
We’ve got a solid pulse of south-west swell rolling in, and the real standout window is the first few days. The water is sitting at 86°, which is a touch warmer than normal for this time of year, so that’s a nice bonus.
We kick things off on Tuesday, July 28th with a strong, long-period groundswell. The morning session is the pick of the entire 16-day forecast. We’re looking at 6ft of swell from the SW, with a very long period of 18 seconds. That’s proper groundswell energy, and the combined energy is strong at 1766. The wind is a light cross-offshore from the ENE, which will keep the surface clean. This is excellent surf for experienced surfers, as that size and power will push it past the beginner zone. Just be aware that with such a long period, at a reef break like Las Avellanas, the waves will have plenty of punch and the sets will be spaced out, but the shape should be excellent. Expect crowds here as it’s a known spot.
The afternoon of the 28th gets messy with a risk of thunderstorms and a cross-on wind, so that’s a write-off.
Wednesday, July 29th morning is another beauty. Swell drops slightly to 5ft from the SW, period a still-impressive 16 seconds, and the wind is a light cross-offshore again. The energy is still strong at 1232. Perfect for another top-tier session.
By Thursday, July 30th, the swell is down to 4ft, but the wind swings offshore from the ENE at 16 mph. That will keep it clean, though the energy is moderate (705). It’s a good option, but not the standout.
After that, the swell steadily fades. From Friday, July 31st through to the start of August, the wave heights drop below 3ft. The mornings offer clean conditions, but the size is small. There’s a rare glassy moment on Sunday, August 2nd and Monday, August 3rd mornings, but with only 2ft and 3ft of swell, it’s marginal. The energy is weak (251 and 300). These are days for the longboard if you’re desperate.
The first week of August is a poor run. The swell remains tiny, mostly under 3ft, and the energy is weak. The wind stays clean in the mornings, but the lack of size is the story. There’s a couple of days with short period windswell from the SSW (7 seconds), which won’t do much for a reef setup.
The second week continues the dry spell. From August 5th onwards, wave heights hover around 1ft to 3ft. The energy is weak (values between 82 and 451). The best you can hope for is a clean, small wave on the morning of August 10th with a gentle offshore wind, but it’s barely breaking. There’s a weird spike of long-period energy on the afternoon of August 10th (20-second period, energy 286) but the swell height is only 1ft, so it’s all hype and no power.
So, the bottom line: The first two mornings, Tuesday the 28th and Wednesday the 29th of July, are the absolute standouts. After that, we’re looking at a long gap of small, weak surf for the rest of the 16 days. It’s a classic case of grabbing the good stuff while it lasts.
Rusty.
Short Range ForecastLight rain (total 2mm), mostly falling on Tue afternoon. Warm (max 32°C on Thu morning, min 25°C on Tue night). Wind will be generally light. | Days 4-6 Weather SummaryHeavy rain (total 25mm), heaviest during Fri night. Warm (max 32°C on Sat morning, min 25°C on Fri night). Wind will be generally light. | ||||||||||||||||||||
Tuesday 28 | Wednesday 29 | Thursday 30 | Friday 31 | Saturday 1 | Sunday 2 | Monday 3 | |||||||||||||||
AM | PM | 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 18 | SW 17 | SW 16 | SW 16 | SW 16 | SW 15 | SW 14 | SW 14 | 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 |
Wave Graph | |||||||||||||||||||||
1741 | 1682 | 1456 | 1194 | 1149 | 856 | 667 | 589 | 485 | 357 | 342 | 326 | 238 | 234 | 147 | 134 | 171 | 167 | 231 | 208 | 84 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross-on | glassy | cross-off | cross-on | cross-off | off | cross | off | cross-off | cross-on | off | cross-off | cross-on | cross-off | glassy | cross-on | glassy | glassy | cross-on | glassy |
High Tide | 1:58PM2.17m | 2:35AM2.02m | 2:40PM2.23m | 3:14AM2.13m | 3:20PM2.28m | 3:51AM2.22m | 3:57PM2.30m | 4:26AM2.30m | 4:34PM2.29m | 5:01AM2.35m | 5:11PM2.25m | 5:36AM2.38m | 5:49PM2.19m | ||||||||
Low Tide | 8:24PM0.42m | 8:31AM0.59m | 9:02PM0.35m | 9:12AM0.52m | 9:37PM0.31m | 9:52AM0.47m | 10:11PM0.28m | 10:30AM0.44m | 10:45PM0.29m | 11:08AM0.42m | 11:19PM0.31m | 11:47AM0.42m | 11:54PM0.35m | ||||||||
5:31 | — | — | 5:31 | — | — | 5:31 | — | — | 5:31 | — | — | 5:31 | — | — | 5:31 | — | — | 5:31 | — | — | |
— | 6:07 | — | — | 6:07 | — | — | 6:07 | — | — | 6:06 | — | — | 6:06 | — | — | 6:06 | — | — | 6:06 | — | |
mm | — | 2 | — | — | — | — | — | — | — | — | 1 | 7 | — | 4 | 5 | — | 4 | 4 | 2 | 5 | 7 |
Temp °C | 31 | 29 | 27 | 31 | 29 | 28 | 32 | 30 | 28 | 31 | 30 | 28 | 32 | 29 | 27 | 31 | 29 | 27 | 29 | 28 | 27 |
Feels °C | 34 | 31 | 31 | 34 | 32 | 31 | 34 | 33 | 31 | 34 | 32 | 32 | 35 | 32 | 29 | 34 | 32 | 32 | 32 | 31 | 31 |
Swell 1 Height (m) Direction Period (s) | SW 18 | SW 17 | SW 16 | SW 16 | SW 16 | SW 15 | SW 14 | SW 14 | SW 14 | SW 14 | SW 13 | SW 13 | SW 13 | SW 13 | SW 12 | SW 12 | S 7 | S 7 | SW 14 | SW 13 | S 7 |
1741 | 1682 | 1456 | 1194 | 1149 | 856 | 667 | 589 | 485 | 357 | 342 | 326 | 238 | 234 | 147 | 108 | 35 | 48 | 231 | 208 | 68 | |
Swell 2 Height (m) Direction Period (s) | S 11 | SSW 9 | S 11 | S 11 | S 10 | S 7 | SSE 7 | N 5 | S 6 | S 7 | S 7 | S 7 | S 12 | N 4 | SW 16 | S 7 | SW 15 | SW 12 | S 7 | S 7 | SW 13 |
60 | 26 | 61 | 56 | 56 | 22 | 26 | 4 | 12 | 15 | 16 | 17 | 72 | 6 | 124 | 33 | 171 | 118 | 47 | 45 | 82 | |
Swell 3 Height (m) Direction Period (s) | SSW 11 | SSW 11 | — | SSW 11 | — | — | W 13 | W 10 | WNW 11 | WNW 11 | WNW 12 | WNW 11 | WNW 12 | SW 16 | WNW 11 | SW 15 | SW 11 | SW 14 | WSW 13 | WNW 10 | SW 13 |
25 | 25 | — | 38 | — | — | 4 | 8 | 24 | 25 | 27 | 40 | 46 | 66 | 41 | 134 | 103 | 167 | 69 | 35 | 84 | |
Wind waves Height (m) Direction Period (s) | — | — | — | — | — | — | NNW 10 | — | NNE 5 | NNE 5 | — | — | NNE 4 | SSW 7 | NNE 4 | N 6 | — | — | — | — | — |
— | — | — | — | — | — | 34 | — | 7 | 9 | — | — | 6 | 18 | 11 | 9 | — | — | — | — | — | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 0 | 206 | 0 | 0 | 1 | 3 | 7 | 11 | 0 | 0 | 206 | 0 | 0 | 1 | 0 | 0 | 1 | 0 | 0 | 1 | 0 |
Best forecast wave conditions in Guanacaste | |||||||||||||||||||||
Best forecast wave conditions in Costa Rica | |||||||||||||||||||||
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Information about the Las Avellanas Surf forecast
The above surf forecast table for Las Avellanas provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Las Avellanas can be found by selecting the local surf guide option on the grey menu. Our Las Avellanas 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 (Las Avellanas) 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 Las Avellanas 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.
Las Avellanas is 45 km (28 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.










