Surf Forecasts:
Guiones surf forecast from 26 Aug 2026:
- Best quality surf: Friday 28 Aug, 9PM (local time) - 4.5ft (1.3m), 18s period, SW swell with cross-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★+): Wednesday 26 Aug, 9PM (local time) - 3ft (0.9m), 7s 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 Wednesday (Aug 26) at 9PM. The primary swell is predicted to be 0.9m and 7s period with a secondary swell of 0.4m and 15s. The wind is predicted to be glassy 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-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.8m 4s period and expected on Monday (Aug 31) at 6PM.
| Wave Type | Time (CST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 9PM (Wed 26th Aug) | 3ft (0.9m) 7s |
| 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 break it down.
We’ve got a solid 16-day window ahead at Guiones, and the early part of the run is a bit of a slow warm-up, but it builds into a proper standout later on. Water temp is sitting at 86°, which is a touch warmer than normal for this time of year, so you’ll be in boardies or a spring suit at most.
The first few days, Wednesday the 26th through Friday the 28th, are pretty small and average. Wednesday morning has some 2ft swell from the SW with a long 15-second period, and a nice cross-off NE breeze at 3 mph keeping things clean, but the energy is weak (169). Thursday morning is even smaller at 1ft, though the offshore NE wind at 6 mph and a very long 18-second period make it look tidy, but again, not much push. Friday morning is where it starts to perk up – 2ft from the SW with a 20-second period, offshore ENE breeze at 6 mph, and moderate energy (724). Clean but still small.
Now, the real standout in this run is Saturday the 29th. That morning is absolute gold. Swell jumps to 5ft from the SW with a 16-second period, the wind is glassy out of the ENE at 3 mph, and the energy cranks up to strong (1209). That’s going to be proper, clean, lined-up waves for experienced surfers. The afternoon gets a bit bigger at 5ft but the wind swings cross-on, so hit it early. After that, Sunday the 30th keeps the good vibes going with another 5ft glassy morning, energy still solid (975), though the period drops to 14 seconds. Monday the 31st is a step down in size to 4ft but still glassy and clean in the morning.
The first week of September sees a bit of a mixed bag. Tuesday the 1st has a moderate breeze and messy cross-off wind, with swell around 3ft to 5ft but short period, so it’s not clean. Wednesday the 2nd is small and cross-shore. Then Thursday the 3rd morning brings back glassy conditions with 3ft, 16-second swell, and good energy (599). Not a standout but a nice clean session.
The next big highlight is Friday the 4th of September. Morning is glassy with a NE breeze, 4ft swell from the SW at 17 seconds, and strong energy (1164). That’s another excellent session for experienced surfers. Saturday the 5th morning is even better – 5ft, glassy calm, zero wind, energy at 1290. That’s a gem. The weekend overall looks solid, with Sunday the 6th glassy and 4-4ft.
After that, the swell drops off a bit. Monday the 7th is choppy and cross-shore, not great. Tuesday the 8th morning is glassy again but small at 2ft, though the period is a very long 19 seconds, so it’ll be clean and fun if you’re keen. Wednesday the 9th morning has a standout call – 4ft, clean cross-off wind from the east, and strong energy (1050). That’s another excellent window for experienced surfers. Thursday the 10th is glassy and 4ft, a solid way to wrap up the run.
Crowds at Guiones are often an issue, so keep that in mind, especially on the glassy mornings. The break is exposed to the WNW swell, and most of the action here comes from the SW, so it’s working well. Consistency is good throughout.
Overall, the best on offer is Saturday the 29th of August and Friday the 4th of September mornings. Both have glassy conditions, solid SW groundswell, and strong energy. If you’re an experienced surfer, those are your sessions.
Rusty.
Short Range ForecastModerate rain (total 11mm), heaviest on Wed afternoon. Warm (max 31°C on Wed morning, min 26°C on Wed night). Wind will be generally light. | Days 4-6 Weather SummaryHeavy rain (total 23mm), heaviest during Sun afternoon. Warm (max 30°C on Sat morning, min 25°C on Mon night). Wind will be generally light. | ||||||||||||||||||||
Wednesday 26 | Thursday 27 | Friday 28 | Saturday 29 | Sunday 30 | Monday 31 | Tuesday 1 | |||||||||||||||
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 15 | SW 15 | SW 15 | SW 18 | SW 18 | SW 16 | SW 20 | SW 19 | SW 18 | SW 16 | SW 16 | SW 15 | SW 14 | SW 14 | SW 14 | SW 13 | SW 13 | SW 13 | SW 12 | S 8 | SW 12 |
Wave Graph | |||||||||||||||||||||
110 | 107 | 104 | 112 | 112 | 245 | 373 | 299 | 1215 | 1123 | 1314 | 1001 | 911 | 821 | 630 | 451 | 386 | 331 | 260 | 221 | 223 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross-on | cross-off | off | cross-on | cross-off | off | cross | cross-off | glassy | cross-on | cross-off | glassy | cross-on | glassy | glassy | cross-on | off | cross-off | cross-off | cross-off |
High Tide | 1:34PM1.93m | 2:07AM1.90m | 2:16PM2.01m | 2:44AM2.03m | 2:55PM2.08m | 3:19AM2.15m | 3:32PM2.12m | 3:53AM2.23m | 4:09PM2.13m | 4:28AM2.28m | 4:46PM2.11m | 5:05AM2.29m | 5:25PM2.07m | ||||||||
Low Tide | 7:54PM0.42m | 8:09AM0.51m | 8:30PM0.34m | 8:48AM0.41m | 9:05PM0.28m | 9:26AM0.32m | 9:39PM0.23m | 10:04AM0.26m | 10:14PM0.21m | 10:42AM0.22m | 10:50PM0.22m | 11:21AM0.22m | 11:28PM0.25m | ||||||||
5:33 | — | — | 5:33 | — | — | 5:33 | — | — | 5:33 | — | — | 5:33 | — | — | 5:33 | — | — | 5:33 | — | — | |
— | 5:54 | — | — | 5:53 | — | — | 5:53 | — | — | 5:52 | — | — | 5:52 | — | — | 5:52 | — | — | 5:51 | — | |
mm | — | 4 | 2 | — | — | 1 | — | 4 | — | — | 3 | 1 | — | 7 | 2 | — | 4 | 6 | 10 | — | 5 |
Temp °C | 31 | 29 | 28 | 31 | 30 | 28 | 31 | 29 | 27 | 30 | 29 | 27 | 29 | 28 | 27 | 30 | 30 | 27 | 26 | 27 | 27 |
Feels °C | 35 | 32 | 33 | 35 | 33 | 33 | 35 | 33 | 30 | 34 | 32 | 31 | 32 | 31 | 32 | 35 | 34 | 31 | 27 | 29 | 30 |
Swell 1 Height (m) Direction Period (s) | S 8 | S 7 | S 7 | S 7 | S 7 | SSW 7 | SW 16 | SSW 7 | SW 18 | SW 16 | SW 16 | SW 15 | SW 14 | SW 14 | SW 14 | SW 13 | SW 13 | S 7 | S 8 | SW 12 | SSW 7 |
41 | 68 | 61 | 44 | 45 | 62 | 306 | 47 | 1215 | 1123 | 1314 | 1001 | 911 | 821 | 630 | 451 | 386 | 139 | 191 | 220 | 139 | |
Swell 2 Height (m) Direction Period (s) | SW 15 | SW 15 | SW 15 | SW 15 | SW 15 | SW 16 | S 7 | SW 19 | SSW 11 | SSW 7 | SSW 7 | SSW 7 | SSW 6 | SW 6 | S 6 | S 7 | S 6 | SW 13 | SW 12 | SW 18 | SW 12 |
110 | 107 | 104 | 77 | 76 | 245 | 45 | 299 | 161 | 48 | 62 | 51 | 47 | 39 | 20 | 32 | 40 | 331 | 260 | 113 | 223 | |
Swell 3 Height (m) Direction Period (s) | SW 11 | SW 11 | SW 19 | SW 18 | SW 18 | SW 21 | SW 20 | SSW 16 | S 13 | S 11 | — | S 10 | S 10 | S 10 | SW 6 | WSW 6 | WSW 6 | W 9 | SW 18 | W 9 | SW 18 |
18 | 18 | 56 | 112 | 112 | 72 | 373 | 175 | 3 | 38 | — | 18 | 17 | 30 | 18 | 15 | 7 | 6 | 84 | 6 | 112 | |
Wind waves Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | S 8 | — |
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 221 | — | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 0 | 29 | 0 | 0 | 31 | 0 | 0 | 3 | 0 | 0 | 39 | 0 | 0 | 49 | 0 | 0 | 19 | 0 | 3 | 49 | 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.











