Surf Forecasts:
Guiones surf forecast from 15 Aug 2026:
- Best quality surf: Saturday 15 Aug, 9AM (local time) - 5ft (1.5m), 16s period, SW swell with offshore winds.
- Most powerful swell: Saturday 15 Aug, 9AM (local time) - 5ft (1.5m), 16s period, SW swell with 1,109 kJ wave energy.
- Next surfable swell (1★+): Saturday 15 Aug, 9AM (local time) - 5ft (1.5m), 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 Saturday (Aug 15) at 9AM. The primary swell is predicted to be 1.5m and 16s period with a secondary swell of 0.7m and 12s. The wind is predicted to be offshore as the swell arrives.
The most powerful waves expected at Guiones in the next 16 days are 1.5m 16s and forecast to arrive on Saturday (Aug 15) at 9AM. Winds are predicted to be offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.3m 2s period and expected on Saturday (Aug 22) at 6AM.
| Wave Type | Time (CST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 9AM (Sat 15th Aug) | 5ft (1.5m) 16s |
| Best Surf | 9AM (Sat 15th Aug) | 5ft (1.5m) 16s |
| Most Powerful | 9AM (Sat 15th Aug) | 5ft (1.5m) 16s |
Table - best surf conditions forecast for Guiones over the next 16 days.
The Lowdown
Alright, Rusty here. Let's have a look at what’s cooking for us.
The next couple of weeks are all about one spot: Guiones. It’s a consistent, beginner-friendly setup, and the southwest swell direction matches what this place loves best. The water temp is about average for this time of year, nothing crazy.
The session kicks off on Saturday the 15th. Early morning, it’s clean with a 5ft SW swell (16-second period) and a light offshore breeze. The wave energy is strong at 1254, but don't be fooled – this is one for the experienced crew. Anything over 5ft at this spot might swallow beginners. By afternoon, the wind goes cross and it gets a bit messy with a risk of storms.
Sunday the 16th is where the real sweet spot sits. Morning sees a drop to around 4.3ft, still a long-period SW groundswell (15 seconds), with a light cross-offshore breeze. That’s a cleaner, more manageable wave. Then Sunday afternoon? Glassy conditions, a light 4ft swell (15 secs) and calm winds. For a surfer, that’s as good as it gets – perfect, clean lines. This is the standout moment of the first week. The energy is still moderate-to-strong at 716, but the quality is top-tier.
The good run continues through Monday and Tuesday mornings (17th & 18th). Clean, glassy or offshore winds, with 3.6ft SW groundswell (14 seconds). It’s a little smaller, but the conditions are pristine. The wave energy has dropped to moderate levels (around 591), but the shape will be excellent.
From Wednesday the 19th into the weekend, the swell slowly backs off to around 2.3ft to 3ft, with some onshore winds and T-storm risk in the afternoons. The mornings hold clean windows with light winds through to Thursday the 20th, but you’re looking at smaller, weaker energy (343). It’s still surfable for a beginner, but nothing to write home about.
There’s a noticeable lull from around the 21st to the 24th. The swell drops to ankle-snappers (1.3ft) with very long periods (20 seconds) – those long-period groundswells at beach breaks can be a bit tricky and straight. Energy dips to a weak 325. Still, the wind stays glassy or light offshore in the mornings, so a longboard can still catch something small and clean.
The second week picks up again. From Monday the 25th to Wednesday the 27th, we get consistent 2ft SW swell (15-16 seconds) with clean morning breezes. The energy stays weak (253 to 322). You’ll be cruising, not charging.
Now, the real juicy bit for the long range: Saturday the 29th. That morning has a beautiful 3.6ft SW groundswell peaking at 17 seconds, with a light offshore flow. The wave energy jumps back into strong territory at 1049. This is a standout for experts. It’s a long way out, so don’t bank on it, but if it holds, that morning will be firing. Sunday the 30th is nearly as good with 3.6ft swell and clean conditions.
Overall, if you’re looking for the best clean, surfable waves for everyone, Sunday the 16th morning and afternoon is the pick. For the experienced crew waiting for a bit more juice, Saturday the 29th morning is the one to watch. When crowds are "often" here, expect company on those standout days.
Short Range ForecastModerate rain (total 15mm), heaviest on Sat night. Warm (max 31°C on Sat morning, min 25°C on Sat night). Wind will be generally light. | Days 5-7 Weather SummaryHeavy rain (total 79mm), heaviest during Wed afternoon. Warm (max 28°C on Tue morning, min 24°C on Wed afternoon). Wind will be generally light. | ||||||||||||||||||
Saturday 15 | Sunday 16 | Monday 17 | Tuesday 18 | Wednesday 19 | Thursday 20 | ||||||||||||||
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 17 | SW 16 | SW 16 | SW 16 | SW 15 | SW 15 | SW 14 | SW 14 | SW 14 | SW 14 | SW 14 | SW 14 | SW 16 | SW 15 | SW 14 | SW 14 | SW 13 | SW 13 | SSW 10 |
Wave Graph | |||||||||||||||||||
1160 | 1109 | 991 | 1041 | 677 | 606 | 598 | 428 | 434 | 416 | 428 | 346 | 477 | 355 | 350 | 238 | 183 | 175 | 253 | |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | off | cross | cross-off | cross-off | glassy | cross-off | off | glassy | cross | glassy | on | cross-off | cross-off | cross-off | cross-off | cross-off | on | off |
High Tide | 4:16AM2.41m | 4:33PM2.29m | 4:59AM2.39m | 5:17PM2.21m | 5:41AM2.32m | 6:00PM2.09m | 6:22AM2.21m | 6:43PM1.94m | 7:04AM2.07m | 7:29PM1.80m | 7:50AM1.94m | 8:19PM1.66m | |||||||
Low Tide | 10:00PM0.01m | 10:27AM0.11m | 10:43PM0.05m | 11:13AM0.15m | 11:25PM0.14m | 11:56AM0.23m | 00:06AM0.26m | 12:40PM0.33m | 00:48AM0.40m | 1:26PM0.45m | 1:32AM0.54m | 2:16PM0.56m | 2:21AM0.66m | ||||||
— | 5:33 | — | — | 5:33 | — | — | 5:33 | — | — | 5:33 | — | — | 5:33 | — | — | 5:33 | — | — | |
— | — | 6:00 | — | — | 6:00 | — | — | 5:59 | — | — | 5:59 | — | — | 5:58 | — | — | 5:58 | — | |
mm | — | — | 4 | 7 | — | — | 4 | — | — | 2 | — | 4 | 9 | 9 | 42 | 6 | — | 7 | 4 |
Temp °C | 27 | 31 | 29 | 26 | 29 | 29 | 26 | 27 | 27 | 27 | 28 | 28 | 27 | 26 | 25 | 25 | 28 | 28 | 26 |
Feels °C | 30 | 35 | 33 | 29 | 31 | 33 | 29 | 31 | 32 | 31 | 33 | 31 | 32 | 29 | 29 | 29 | 32 | 32 | 31 |
Swell 1 Height (m) Direction Period (s) | SW 17 | SW 16 | SW 16 | SW 16 | SW 15 | SW 15 | SW 14 | SW 14 | SW 14 | SW 14 | SSW 8 | SSW 8 | SSW 8 | SSW 8 | S 8 | SSW 8 | SSW 8 | SSW 8 | SSW 10 |
1160 | 1109 | 991 | 1041 | 677 | 606 | 598 | 428 | 434 | 416 | 151 | 178 | 181 | 163 | 93 | 123 | 147 | 157 | 253 | |
Swell 2 Height (m) Direction Period (s) | S 12 | S 12 | S 12 | S 6 | SSW 7 | SSW 7 | SSW 7 | S 8 | S 8 | S 8 | SW 14 | SW 14 | SW 16 | SW 15 | SW 14 | SW 14 | SW 13 | SW 13 | SW 13 |
178 | 136 | 134 | 49 | 73 | 73 | 79 | 142 | 138 | 115 | 428 | 346 | 477 | 355 | 350 | 238 | 183 | 175 | 83 | |
Swell 3 Height (m) Direction Period (s) | — | WSW 10 | NNW 6 | S 12 | S 11 | S 11 | S 11 | S 11 | S 11 | S 10 | S 10 | S 13 | S 12 | S 11 | SW 8 | NW 8 | SW 18 | SW 18 | SSW 19 |
— | 9 | 7 | 66 | 38 | 37 | 37 | 21 | 20 | 8 | 8 | 3 | 11 | 9 | 53 | 3 | 13 | 12 | 36 | |
Wind waves Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 0 | 0 | 3 | 0 | 0 | 0 | 0 | 0 | 0 | 3 | 0 | 31 | 0 | 0 | 0 | 0 | 0 | 31 | 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.











