Surf Forecasts:
Guiones surf forecast from 20 Aug 2026:
- Best quality surf: Monday 24 Aug, 3AM (local time) - 2.5ft (0.7m), 18s period, SW swell with offshore winds.
- Most powerful swell: Monday 24 Aug, 6PM (local time) - 2.5ft (0.8m), 17s period, SW swell with 346 kJ wave energy.
- Next surfable swell (1★+): Thursday 20 Aug, 6PM (local time) - 3.5ft (1.0m), 11s period with S swell.
Best Forecast Surf Conditions for Guiones this week:
The surf forecast for Guiones over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Thursday (Aug 20) at 6PM. The primary swell is predicted to be 1.0m and 11s period with a secondary swell of 0.6m and 13s. The wind is predicted to be glassy as the swell arrives.
The most powerful waves expected at Guiones in the next 16 days are 0.8m 17s and forecast to arrive on Monday (Aug 24) at 6PM. Winds are predicted to be glassy at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.3m 5s period and expected on Monday (Aug 24) at 3AM.
| Wave Type | Time (CST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 6PM (Thu 20th Aug) | 3.5ft (1.0m) 11s |
| Best Surf | 3AM (Mon 24th Aug) | 2.5ft (0.7m) 18s |
| Most Powerful | 6PM (Mon 24th Aug) | 2.5ft (0.8m) 17s |
Table - best surf conditions forecast for Guiones over the next 16 days.
The Lowdown
Alright, folks, Rusty here. Let’s have a proper look at what’s coming our way for the next 16 days at Guiones. It’s a mixed bag, but there’s some real gold to be found if you time it right.
Right now, we’re looking at a pretty slow start. The first week is mostly small, clean waves for the beginners and longboarders, with the odd pulse of energy. The water is sitting at 86°, which is a touch warmer than normal for this time of year, so you’ll be comfortable in a shorty or just boardshorts.
The highlight of the whole run is undoubtedly the morning of Saturday, the 29th of August. That’s the one to circle on the calendar. We’ve got a solid 5ft swell pushing in from the SW, and with the wind swinging out of the ENE at just 6 mph, it’s going to be clean and offshore. The combined energy is a massive 1643, which is some serious grunt. This is excellent for experienced surfers – heads up, this is a bit too big for beginners. The swell period is a long 17 seconds, so it’s proper groundswell, giving you powerful, well-shaped lines. The size and power will keep the crowds at bay a little, but be ready for a session.
The other standout is the morning of Friday, the 4th of September. That’s a full week later, so it’s a bit more of a long-range whisper, but it looks promising. We’re looking at 4ft of SW swell with a long 18-second period. The wind is a glassy offshore from the ENE at 3 mph, meaning it’ll be near-perfect conditions. The combined energy is 1045, another strong pulse. Again, this is for the experienced crew looking for clean, powerful waves.
The rest of the outlook is a story of small, clean mornings and choppy afternoons. For the first few days, you’ll find 2ft to 4ft of SW swell with clean offshore winds in the mornings. Thursday the 20th kicks off with a clean 2ft, and Friday the 21st has a cleaner 4ft. The mornings of the 22nd, 24th, and 25th are all clean and small. Sunday the 23rd is a special one for the glassy conditions – 1ft in the morning and 2ft in the afternoon, both with glassy winds. The swell is tiny, but the surface will be like a mirror.
There is a gap in the middle of the second week. After the 30th of August, the swell drops and the wind turns messy, making for a few days of marginal surf. The 31st of August and the 1st of September are looking pretty poor with small, choppy waves. It picks up again on the 2nd and 3rd of September with small, clean swells, but nothing of note until the 4th.
So, to sum it up: the best bet is the morning of the 29th of August for the experienced crew, followed by the morning of the 4th of September. The mornings are your friend here, and the afternoons are mostly a write-off with the sea breeze and risk of thunderstorms.
Rusty out.
Short Range ForecastModerate rain (total 18mm), heaviest on Sat afternoon. Warm (max 30°C on Fri morning, min 26°C on Thu night). Wind will be generally light. | Days 4-6 Weather SummaryHeavy rain (total 27mm), heaviest during Sun afternoon. Warm (max 30°C on Sun morning, min 25°C on Sun night). Wind will be generally light. | ||||||||||||||||||||
Thursday 20 | Friday 21 | Saturday 22 | Sunday 23 | Monday 24 | Tuesday 25 | Wednesday 26 | |||||||||||||||
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) | SSW 9 | SSW 10 | S 11 | S 11 | S 11 | S 11 | S 11 | S 10 | S 10 | SW 20 | SW 18 | SW 18 | SW 18 | SW 17 | SW 16 | SW 16 | SW 16 | SW 15 | SW 15 | SW 15 | SW 15 |
Wave Graph | |||||||||||||||||||||
144 | 154 | 281 | 286 | 289 | 279 | 223 | 158 | 154 | 134 | 260 | 258 | 255 | 243 | 322 | 211 | 206 | 191 | 110 | 107 | 104 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | off | cross-on | off | cross-off | cross-on | glassy | off | cross-on | cross-off | glassy | glassy | cross-off | off | cross | off | glassy | cross-on | off | off | cross | cross-off |
High Tide | 8:19PM1.66m | 8:41AM1.82m | 9:19PM1.56m | 9:42AM1.74m | 10:29PM1.52m | 10:49AM1.72m | 11:39PM1.55m | 11:53AM1.76m | 00:38AM1.64m | 12:48PM1.84m | 1:26AM1.77m | 1:34PM1.93m | 2:07AM1.90m | ||||||||
Low Tide | 2:16PM0.56m | 2:21AM0.66m | 3:14PM0.64m | 3:19AM0.75m | 4:20PM0.68m | 4:28AM0.79m | 5:28PM0.66m | 5:36AM0.77m | 6:26PM0.60m | 6:35AM0.70m | 7:13PM0.51m | 7:25AM0.61m | 7:54PM0.42m | ||||||||
5:33 | — | — | 5:33 | — | — | 5:33 | — | — | 5:33 | — | — | 5:33 | — | — | 5:33 | — | — | 5:33 | — | — | |
— | 5:58 | — | — | 5:57 | — | — | 5:57 | — | — | 5:55 | — | — | 5:55 | — | — | 5:54 | — | — | 5:54 | — | |
mm | — | 4 | 1 | — | — | — | — | 7 | 6 | 1 | 8 | 1 | 2 | 6 | 2 | 1 | 6 | — | 1 | 6 | 11 |
Temp °C | 29 | 29 | 28 | 30 | 30 | 28 | 30 | 29 | 27 | 30 | 30 | 26 | 29 | 29 | 26 | 28 | 29 | 26 | 29 | 29 | 27 |
Feels °C | 32 | 32 | 33 | 33 | 34 | 33 | 33 | 33 | 31 | 35 | 35 | 29 | 33 | 33 | 30 | 32 | 33 | 29 | 32 | 32 | 31 |
Swell 1 Height (m) Direction Period (s) | SSW 9 | SSW 10 | S 11 | S 11 | S 11 | S 11 | S 11 | S 10 | S 10 | S 9 | S 9 | S 9 | S 9 | S 9 | SW 16 | S 9 | S 9 | S 7 | S 7 | SSW 7 | SSW 7 |
123 | 154 | 281 | 286 | 289 | 279 | 223 | 158 | 154 | 109 | 136 | 134 | 104 | 102 | 322 | 55 | 54 | 49 | 45 | 62 | 82 | |
Swell 2 Height (m) Direction Period (s) | SW 13 | SW 13 | SW 13 | SW 15 | SW 15 | SW 15 | SW 14 | SW 14 | SW 13 | SW 13 | SW 18 | SW 18 | SW 18 | SW 17 | S 9 | SW 16 | SW 16 | SW 15 | SW 15 | SW 15 | SW 15 |
144 | 140 | 83 | 76 | 75 | 183 | 95 | 158 | 84 | 85 | 260 | 258 | 255 | 243 | 76 | 211 | 206 | 191 | 110 | 107 | 104 | |
Swell 3 Height (m) Direction Period (s) | S 13 | S 13 | SSW 19 | SW 12 | SW 12 | SW 6 | SW 16 | SW 20 | SW 20 | SW 20 | SW 13 | SW 12 | SW 12 | SW 12 | SW 12 | SW 12 | SW 11 | SW 11 | SW 11 | SSW 11 | SW 19 |
14 | 29 | 36 | 36 | 36 | 9 | 43 | 98 | 97 | 134 | 84 | 98 | 71 | 69 | 35 | 35 | 31 | 31 | 30 | 11 | 56 | |
Wind waves Height (m) Direction Period (s) | — | — | — | — | SW 6 | — | — | WSW 6 | — | — | — | — | — | — | — | — | — | — | — | — | — |
— | — | — | — | 10 | — | — | 6 | — | — | — | — | — | — | — | — | — | — | — | — | — | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 0 | 39 | 0 | 0 | 29 | 0 | 0 | 39 | 0 | 0 | 0 | 0 | 0 | 3 | 0 | 0 | 26 | 0 | 0 | 3 | 0 |
Best forecast wave conditions in Guanacaste | |||||||||||||||||||||
Best forecast wave conditions in Costa Rica | |||||||||||||||||||||
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Information about the Guiones Surf forecast
The above surf forecast table for Guiones provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Guiones can be found by selecting the local surf guide option on the grey menu. Our Guiones 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 (Guiones) 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 Guiones 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.
Guiones is 34 km (21 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.











