
Surf Forecasts:
Guiones surf forecast from 12 Aug 2026:
- Best quality surf: Friday 14 Aug, 9PM (local time) - 4.5ft (1.4m), 18s period, SW swell with glassy winds.
- Most powerful swell: Friday 14 Aug, 9PM (local time) - 4.5ft (1.4m), 18s period, SW swell with 1,201 kJ wave energy.
- Next surfable swell (1★+): Wednesday 12 Aug, 6AM (local time) - 2ft (0.6m), 16s period with SW 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 Wednesday (Aug 12) at 6AM. The primary swell is predicted to be 0.6m and 16s period with a secondary swell of 0.6m and 13s. The wind is predicted to be offshore as the swell arrives.
The most powerful waves expected at Guiones in the next 16 days are 1.4m 18s and forecast to arrive on Friday (Aug 14) at 9PM. Winds are predicted to be glassy at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.5m 6s period and expected on Sunday (Aug 16) at 12PM.
| Wave Type | Time (CST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 6AM (Wed 12th Aug) | 2ft (0.6m) 16s |
| Best Surf | 9PM (Fri 14th Aug) | 4.5ft (1.4m) 18s |
| Most Powerful | 9PM (Fri 14th Aug) | 4.5ft (1.4m) 18s |
Table - best surf conditions forecast for Guiones over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let’s get into it.
We’ve got a solid run of surf on the cards for this stretch, with a nice pulse of groundswell and mostly clean mornings. The first few days are a bit small, but it builds into a real standout around the middle of August.
The water temp is sitting about average for the time of year, so nothing out of the ordinary there.
Wednesday 12th August kicks things off with a small 2ft swell from the SW, but with a long 16 second period that gives it some shape. The morning is clean with a light offshore breeze, and the combined energy is moderate (405). It’s a good start, but nothing to write home about. The afternoon gets a bit bumpy with a cross-onshore wind.
Thursday 13th August morning is glassy and clean again, with a similar 2ft SW swell, but the period is a touch shorter at 15 seconds. Afternoon turns choppy, so make the most of the early session.
Friday 14th August morning is where things start to get interesting. The swell picks up to 4ft from the SW, and the period jumps to a very long 18 seconds. That’s proper groundswell energy. The wind is light offshore, the water is clean, and the combined energy sits at 921 (moderate). This is a real nice morning. The afternoon stays decent but gets a bit tricky with a cross-onshore breeze.
Saturday 15th August is the standout. Morning brings 5ft of SW swell with a 16 second period, combined energy hitting 1254 (strong). The wind is light offshore, the waves are clean, and the conditions are excellent for experienced surfers. This is the best on offer. If you can handle it, this is your morning. The afternoon has a chance of thunderstorms and a cross-shore breeze, so go early.
Sunday 16th August still has plenty of size – 4ft SW swell with a 15 second period – and both morning and afternoon are clean with offshore or cross-offshore winds. The energy is still strong (869). Good consistency on offer.
Monday 17th August holds the 4ft SW swell, with a period easing to 14 seconds. Morning has light offshore wind and clean conditions, and the afternoon stays offshore too. A solid day.
Tuesday 18th August morning is glassy. Absolutely glassy. 4ft SW swell, 14 seconds, and not a breath of wind. The combined energy is moderate (527). That’s a dreamy session. The afternoon gets a bit of a cross-shore breeze, but the morning is pure magic.
Wednesday 19th August morning is glassy again with 3ft of 15 second SW swell. Clean and calm. Good for a fun session.
From Thursday 20th August onwards, the swell drops back. Mornings are glassy or light offshore, but the wave height sits around 2ft to 3ft through the rest of the week and into the next. The periods stay long, often 13-19 seconds, so there’s still some life in the water, but it’s definitely smaller. There’s a gap of smaller, less consistent surf from the 20th through to the 27th, with only a few mornings offering clean conditions and small waves.
Thursday 27th August morning sees a slight uptick to 2ft from the SW with a long 18 second period, and a light offshore wind. Combined energy is back up to 404. It’s not the big stuff, but it’s a clean, fun end to the outlook.
All in all, the pick of the run is Saturday 15th August morning at Guiones – that’s the one to circle. The early sessions on Friday 14th and Tuesday 18th are also top-notch.
Rusty out.
Short Range ForecastLight rain (total 2mm), mostly falling on Wed afternoon. Warm (max 31°C on Wed morning, min 26°C on Tue night). Wind will be generally light. | Days 5-7 Weather SummaryHeavy rain (total 20mm), heaviest during Sat night. Warm (max 30°C on Sat morning, min 24°C on Sun night). Wind will be generally light. | ||||||||||||||||||
Wednesday 12 | Thursday 13 | Friday 14 | Saturday 15 | Sunday 16 | Monday 17 | ||||||||||||||
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 13 | SW 16 | SW 16 | SW 15 | SW 15 | SW 15 | SW 20 | SW 18 | SW 18 | SW 17 | SW 16 | SW 16 | SW 16 | SW 15 | SW 15 | SW 14 | SW 14 | SW 14 | SW 14 |
Wave Graph | |||||||||||||||||||
212 | 211 | 427 | 221 | 176 | 255 | 373 | 804 | 777 | 1160 | 1109 | 991 | 1041 | 677 | 677 | 598 | 428 | 434 | 416 | |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | off | cross-off | cross-on | off | off | cross-on | off | off | cross-on | cross-off | off | cross | off | off | cross-off | glassy | off | off | off |
High Tide | 1:50AM2.10m | 2:08PM2.27m | 2:43AM2.25m | 2:59PM2.32m | 3:31AM2.36m | 3:47PM2.33m | 4:16AM2.41m | 4:33PM2.29m | 4:59AM2.39m | 5:17PM2.21m | 5:41AM2.32m | 6:00PM2.09m | |||||||
Low Tide | 7:55AM0.27m | 8:27PM0.08m | 8:50AM0.18m | 9:15PM0.02m | 9:40AM0.13m | 10:00PM0.01m | 10:27AM0.11m | 10:43PM0.05m | 11:13AM0.15m | 11:25PM0.14m | 11:56AM0.23m | 00:06AM0.26m | |||||||
— | 5:33 | — | — | 5:33 | — | — | 5:33 | — | — | 5:33 | — | — | 5:33 | — | — | 5:33 | — | — | |
— | — | 6:00 | — | — | 6:00 | — | — | 6:00 | — | — | 6:00 | — | — | 6:00 | — | — | 5:59 | — | |
mm | — | — | 1 | — | — | — | — | — | 1 | — | 1 | 6 | 8 | — | — | 3 | 2 | — | — |
Temp °C | 28 | 31 | 30 | 27 | 31 | 30 | 28 | 30 | 29 | 28 | 30 | 28 | 27 | 27 | 27 | 26 | 25 | 26 | 25 |
Feels °C | 33 | 34 | 34 | 30 | 34 | 32 | 33 | 32 | 32 | 33 | 33 | 32 | 31 | 30 | 29 | 29 | 29 | 28 | 27 |
Swell 1 Height (m) Direction Period (s) | SW 13 | SW 16 | SW 16 | S 8 | S 8 | SW 15 | SW 16 | SW 18 | SW 18 | SW 17 | SW 16 | SW 16 | SW 16 | SW 15 | SW 15 | SW 14 | SW 14 | SW 14 | SW 14 |
212 | 211 | 427 | 61 | 74 | 255 | 251 | 804 | 777 | 1160 | 1109 | 991 | 1041 | 677 | 677 | 598 | 428 | 434 | 416 | |
Swell 2 Height (m) Direction Period (s) | S 9 | SW 13 | S 9 | SW 15 | SW 15 | S 8 | S 8 | S 7 | S 11 | S 12 | S 12 | S 12 | S 12 | S 11 | S 6 | S 11 | S 8 | S 7 | S 7 |
58 | 136 | 76 | 221 | 176 | 57 | 60 | 53 | 163 | 178 | 136 | 137 | 129 | 192 | 54 | 149 | 90 | 108 | 81 | |
Swell 3 Height (m) Direction Period (s) | SW 18 | S 9 | S 16 | SW 12 | S 14 | S 12 | SW 20 | S 11 | SW 14 | WSW 6 | WSW 10 | — | SW 8 | — | S 11 | SW 19 | S 11 | S 11 | S 10 |
152 | 58 | 124 | 71 | 92 | 27 | 373 | 64 | 297 | 4 | 9 | — | 3 | — | 58 | 15 | 36 | 20 | 18 | |
Wind waves Height (m) Direction Period (s) | — | — | — | — | NNW 8 | — | — | — | — | — | — | — | — | N 3 | NNE 6 | — | — | — | NE 3 |
— | — | — | — | 6 | — | — | — | — | — | — | — | — | 2 | 22 | — | — | — | 2 | |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 0 | 0 | 32 | 0 | 0 | 29 | 0 | 0 | 54 | 0 | 0 | 3 | 0 | 0 | 0 | 0 | 0 | 0 | 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.











