Surf Forecasts:
Guiones surf forecast from 23 Aug 2026:
- Best quality surf: Friday 28 Aug, 9PM (local time) - 4.5ft (1.3m), 18s period, SW swell with offshore winds.
- Most powerful swell: Saturday 29 Aug, 3PM (local time) - 5ft (1.6m), 16s period, SW swell with 1,314 kJ wave energy.
- Next surfable swell (1★+): Sunday 23 Aug, 6PM (local time) - 2ft (0.6m), 18s 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 Sunday (Aug 23) at 6PM. The primary swell is predicted to be 0.6m and 18s period with a secondary swell of 0.8m and 9s. The wind is predicted to be offshore as the swell arrives.
The most powerful waves expected at Guiones in the next 16 days are 1.6m 16s and forecast to arrive on Saturday (Aug 29) at 3PM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.2m 5s period and expected on Wednesday (Aug 26) at 6AM.
| Wave Type | Time (CST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 6PM (Sun 23rd Aug) | 2ft (0.6m) 18s |
| Best Surf | 9PM (Fri 28th Aug) | 4.5ft (1.3m) 18s |
| Most Powerful | 3PM (Sat 29th Aug) | 5ft (1.6m) 16s |
Table - best surf conditions forecast for Guiones over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let’s have a look at what’s cookin' for the next couple of weeks.
We’ve got a real slow start, but don’t let that fool ya. The first few days are small and clean, perfect for gettin' the cobwebs out, but the real magic is buildin' in the distance. This is a classic build-up pattern, and by the end of the first week into the second, we’re lookin' at some serious pulse.
The first call is Guiones. The water is a touch warmer than normal for this time of year, sittin' at 86°F, so you’re in for a nice, warm dip.
Sunday the 23rd starts us off with a tiny 3ft swell from the south, but with a light offshore breeze, it’s clean and fun for the beginners. The real story is the long-period groundswell showing up Sunday afternoon – 18 seconds from the southwest, with a moderate energy. That’s a sign of things to come. Monday morning, the 24th, is glassy with the same 2ft southwest groundswell, so it’s small but silky. By Tuesday the 25th, the morning is clean with a 2ft southwest swell, light offshore wind, and it’s a nice little session for the longboard.
Now, the magic starts to turn on Friday the 28th. The morning brings a 2ft southwest swell with a 20-second period, and the energy is building. The wind is offshore, and the waves are clean. This is a standout for the first week.
Then, hold onto your board. Saturday the 29th morning is where it gets real. Glassy conditions, a 5ft southwest swell, and the energy is crankin'. This is a standout for the whole period. It’s gettin' solid, so this is for the experienced crew. The afternoon is a bit bigger at 5ft, but the wind jacks up, so the morning is the pick.
Sunday the 30th keeps the good vibes rollin' with a 5ft swell and glassy conditions again in the morning. The energy is still high. The following week, Monday the 31st, is back to a 4ft swell but still glassy in the morning. A solid, fun size.
The real bomb is the following week. Thursday the 3rd of September is a gem, with a 2ft, 20-second period groundswell, glassy conditions. But the kicker is Friday the 4th of September. Morning is 6ft from the southwest, glassy, and the energy is massive. The afternoon is even bigger at 7ft, glassy. This is for experts only. That’s the best swell of the whole run. Saturday the 5th of September is still crankin' at 6ft in the morning with a clean offshore wind. Sunday the 6th of September morning is another glassy day with a 5ft swell.
So, if you’re waitin' for the big one, point your board at Friday the 4th of September. That’s the standout. The crowds at Guiones can be often, so get there early for the best of it.
Rusty.
Short Range ForecastModerate rain (total 18mm), heaviest on Tue afternoon. Warm (max 31°C on Sun morning, min 25°C on Sun night). Wind will be generally light. | Days 4-6 Weather SummaryHeavy rain (total 83mm), heaviest during Wed night. Warm (max 30°C on Wed morning, min 24°C on Wed night). Wind will be generally light. | ||||||||||||||||||||
Sunday 23 | Monday 24 | Tuesday 25 | Wednesday 26 | Thursday 27 | Friday 28 | Saturday 29 | |||||||||||||||
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) | S 9 | SW 18 | SW 18 | SW 18 | SW 17 | SW 16 | SW 16 | SW 16 | SW 15 | SW 15 | SW 15 | SW 15 | SW 18 | SW 18 | SW 16 | SW 20 | SW 19 | SW 18 | SW 16 | SW 16 | SW 15 |
Wave Graph | |||||||||||||||||||||
137 | 260 | 314 | 255 | 243 | 322 | 211 | 206 | 191 | 110 | 107 | 104 | 112 | 112 | 245 | 373 | 299 | 1215 | 1123 | 1314 | 1001 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | off | off | off | glassy | cross-on | cross-off | off | cross | off | off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross | off | glassy | cross | glassy |
High Tide | 10:49AM1.72m | 11:39PM1.55m | 11:53AM1.76m | 00:38AM1.64m | 12:48PM1.84m | 1:26AM1.77m | 1:34PM1.93m | 2:07AM1.90m | 2:16PM2.01m | 2:44AM2.03m | 2:55PM2.08m | 3:19AM2.15m | 3:32PM2.12m | ||||||||
Low Tide | 5:28PM0.66m | 5:36AM0.77m | 6:26PM0.60m | 6:35AM0.70m | 7:13PM0.51m | 7:25AM0.61m | 7:54PM0.42m | 8:09AM0.51m | 8:30PM0.34m | 8:48AM0.41m | 9:05PM0.28m | 9:26AM0.32m | 9:39PM0.23m | ||||||||
5:33 | — | — | 5:33 | — | — | 5:33 | — | — | 5:33 | — | — | 5:33 | — | — | 5:33 | — | — | 5:33 | — | — | |
— | 5:55 | — | — | 5:55 | — | — | 5:54 | — | — | 5:54 | — | — | 5:53 | — | — | 5:53 | — | — | 5:52 | — | |
mm | — | — | 4 | 2 | 2 | 1 | 1 | 6 | 2 | 1 | 8 | 62 | 5 | 1 | 1 | — | 4 | 1 | — | — | — |
Temp °C | 31 | 30 | 26 | 29 | 29 | 27 | 30 | 29 | 27 | 30 | 29 | 26 | 25 | 26 | 26 | 30 | 29 | 26 | 29 | 30 | 28 |
Feels °C | 35 | 34 | 28 | 33 | 32 | 32 | 34 | 32 | 31 | 33 | 33 | 29 | 29 | 30 | 30 | 34 | 32 | 28 | 31 | 32 | 32 |
Swell 1 Height (m) Direction Period (s) | S 9 | S 9 | S 9 | S 9 | S 9 | SW 16 | SW 16 | SW 16 | SW 15 | S 7 | S 7 | S 6 | SSW 6 | SSW 6 | SW 16 | SW 16 | SW 19 | SW 18 | SW 16 | SW 16 | SW 15 |
137 | 106 | 106 | 104 | 102 | 322 | 211 | 206 | 191 | 50 | 58 | 95 | 66 | 55 | 245 | 306 | 299 | 1215 | 1123 | 1314 | 1001 | |
Swell 2 Height (m) Direction Period (s) | SW 13 | SW 18 | SW 18 | SW 18 | SW 17 | S 9 | S 9 | S 8 | S 8 | SW 15 | SW 15 | SW 15 | SW 15 | SW 15 | S 6 | SW 20 | SSW 16 | SSW 6 | SSW 6 | S 11 | SW 6 |
85 | 260 | 314 | 255 | 243 | 76 | 53 | 51 | 47 | 110 | 107 | 104 | 77 | 76 | 30 | 373 | 175 | 36 | 57 | 36 | 39 | |
Swell 3 Height (m) Direction Period (s) | SW 20 | SW 13 | SW 12 | SW 12 | SW 12 | SW 12 | SW 12 | SW 11 | SW 11 | SW 11 | SSW 20 | SW 19 | SW 18 | SW 18 | SW 6 | SSW 6 | SW 14 | SSW 11 | — | — | S 7 |
134 | 84 | 75 | 71 | 69 | 49 | 35 | 31 | 30 | 30 | 37 | 56 | 112 | 112 | 19 | 31 | 114 | 40 | — | — | 25 | |
Wind waves Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | S 7 | — | — | — | — | — | — | — | — | SSW 6 | — |
— | — | — | — | — | — | — | — | — | — | 92 | — | — | — | — | — | — | — | — | 64 | — | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 0 | 0 | 0 | 0 | 31 | 0 | 0 | 3 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 14 | 0 | 0 | 103 | 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.











