Surf Forecasts:
Guiones surf forecast from 11 Sep 2026:
- Best quality surf: Friday 11 Sep, 6AM (local time) - 4ft (1.2m), 16s period, SW swell with cross-offshore winds.
- Most powerful swell: Friday 11 Sep, 6AM (local time) - 4ft (1.2m), 16s period, SW swell with 710 kJ wave energy.
- Next surfable swell (1★+): Friday 11 Sep, 6AM (local time) - 4ft (1.2m), 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 Friday (Sep 11) at 6AM. The primary swell is predicted to be 1.2m and 16s period with a secondary swell of 0.8m and 7s. The wind is predicted to be cross-offshore as the swell arrives.
The most powerful waves expected at Guiones in the next 16 days are 1.2m 16s and forecast to arrive on Friday (Sep 11) at 6AM. Winds are predicted to be cross-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 Monday (Sep 14) at 6AM.
| Wave Type | Time (CST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 6AM (Fri 11th Sep) | 4ft (1.2m) 16s |
| Best Surf | 6AM (Fri 11th Sep) | 4ft (1.2m) 16s |
| Most Powerful | 6AM (Fri 11th Sep) | 4ft (1.2m) 16s |
Table - best surf conditions forecast for Guiones over the next 16 days.
The Lowdown
Alright crew, Rusty here. Let’s get into the sixteen-day window for Guiones. This spot is consistent, exposed, and a great wave for beginners. The wind and swell are gonna keep us busy.
Water temp is about normal for the season, so you won’t need anything too heavy.
The real gem is Friday, September 11th in the morning. We’ve got a 4ft SW groundswell with a long 16-second period – that’s proper energy (770). The wind is a clean offshore from the ENE. The waves will be clean, lined up, and super fun. The sets will be a bit spread out because of the long period, but paddling will be a breeze, and the shape will be sweet. This is your best bet.
The weekend settles. Saturday the 12th morning drops to 3ft from the SW, still with a clean offshore breeze. Sunday the 13th is down to 2ft and goes glassy in the morning – great for a longboard, but not much power.
Through the middle of the next week, Monday the 14th through Thursday the 17th, every morning delivers glassy conditions with waves around 2ft to 4ft from the SW. The energy is in the 400-750 range, so there’s good push for the size. The best of those is Thursday the 17th morning with dead calm wind and a 4ft SW swell – clean as a whistle.
The second week gets a bit messy from the 18th to the 21st with cross-onshore winds and lower energy. Not much to get excited about.
Then on Tuesday the 22nd morning we get a pulse. The swell jumps to 6ft from the SSW, but the period is short at just 8 seconds – a windswell pulse. The energy is high (830), and the wind is glassy from the WNW. That 6ft size is for experts only. The short period means it’ll be racy, a bit lumpy, and not as clean as the earlier groundswell.
By the 25th and 26th, we get a small 3ft SW swell with a light offshore wind – a nice, easy session for the longboard.
So, your standout is definitely Friday the 11th morning – glassy, long-period, and solid size. The second-best run is the glassy mornings from the 15th through the 17th, offering clean, forgiving waves. The Tuesday the 22nd spike is one for the experienced crew who don’t mind a short-period challenge.
Rusty out.
Short Range ForecastHeavy rain (total 20mm), heaviest during Sun afternoon. Warm (max 30°C on Fri morning, min 26°C on Fri night). Wind will be generally light. | Days 5-7 Weather SummaryHeavy rain (total 44mm), heaviest during Tue night. Warm (max 29°C on Mon morning, min 26°C on Sun night). Wind will be generally light. | ||||||||||||||||||
Friday 11 | Saturday 12 | Sunday 13 | Monday 14 | Tuesday 15 | Wednesday 16 | ||||||||||||||
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 16 | SW 16 | SW 15 | SW 14 | SW 14 | SW 14 | SW 13 | SW 13 | SW 13 | SW 19 | SW 19 | SW 18 | SW 18 | SW 18 | SW 17 | SW 16 | SW 16 | SW 16 | SW 15 |
Wave Graph  | |||||||||||||||||||
 kJ | 897 | 701 | 631 | 459 | 346 | 341 | 215 | 140 | 138 | 299 | 219 | 246 | 379 | 249 | 499 | 432 | 502 | 539 | 418 |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | off | off | cross-on | off | off | cross-on | glassy | glassy | cross-on | off | glassy | cross-on | cross-off | glassy | cross-on | cross-off | glassy | cross-on | glassy |
High Tide | 2:24AM2.29m | 2:44PM2.24m | 3:07AM2.37m | 3:28PM2.26m | 3:48AM2.40m | 4:09PM2.23m | 4:27AM2.37m | 4:49PM2.16m | 5:05AM2.28m | 5:28PM2.05m | 5:44AM2.17m | 6:08PM1.93m | |||||||
Low Tide | 8:36AM0.17m | 8:53PM0.11m | 9:21AM0.11m | 9:34PM0.10m | 10:03AM0.09m | 10:14PM0.14m | 10:43AM0.13m | 10:53PM0.21m | 11:23AM0.20m | 11:31PM0.32m | 12:03PM0.30m | 00:10AM0.44m | |||||||
 |  | |  | |  | | | | | | | | | | | |  | | |
 | — | 5:31 | — | — | 5:31 | — | — | 5:31 | — | — | 5:31 | — | — | 5:31 | — | — | 5:31 | — | — |
 | — | — | 5:45 | — | — | 5:45 | — | — | 5:44 | — | — | 5:43 | — | — | 5:43 | — | — | 5:42 | — |
mm | — | — | — | 2 | — | 2 | 8 | 1 | 7 | 7 | 1 | 1 | 5 | — | 3 | 17 | 3 | 7 | 4 |
Temp °C | 28 | 30 | 30 | 28 | 30 | 29 | 28 | 30 | 29 | 27 | 29 | 29 | 27 | 29 | 29 | 27 | 28 | 28 | 26 |
Feels °C | 32 | 32 | 34 | 33 | 32 | 32 | 33 | 34 | 32 | 32 | 33 | 32 | 31 | 32 | 32 | 30 | 32 | 31 | 31 |
Swell 1 Height (m) Direction Period (s) | SW 16 | SW 16 | SW 15 | SW 14 | SW 14 | SW 14 | SW 13 | S 9 | S 9 | S 8 | S 8 | S 8 | S 8 | S 8 | SW 17 | SW 16 | SW 16 | SW 16 | SW 15 |
| kJ | 897 | 701 | 631 | 459 | 346 | 341 | 215 | 101 | 99 | 108 | 113 | 116 | 108 | 108 | 499 | 432 | 502 | 539 | 418 |
Swell 2 Height (m) Direction Period (s) | S 7 | S 7 | S 7 | S 7 | S 8 | S 8 | S 9 | SW 13 | SW 13 | SW 13 | SW 19 | SW 18 | SW 18 | SW 14 | S 8 | S 9 | S 9 | S 8 | SSW 7 |
| kJ | 52 | 36 | 62 | 53 | 43 | 68 | 76 | 140 | 138 | 134 | 219 | 246 | 379 | 206 | 111 | 96 | 94 | 86 | 69 |
Swell 3 Height (m) Direction Period (s) | WNW 10 | SSE 10 | WNW 10 | WNW 10 | WNW 10 | SW 18 | SW 21 | SW 17 | SW 20 | SW 19 | SW 12 | SW 12 | SW 12 | SW 18 | SW 13 | SW 13 | SW 13 | W 13 | SW 23 |
| kJ | 20 | 33 | 10 | 10 | 9 | 80 | 71 | 47 | 60 | 299 | 73 | 71 | 49 | 249 | 109 | 128 | 163 | 13 | 86 |
Wind waves Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | NE 2 | — | — | — | — | — | — | — | — |
| kJ | — | — | — | — | — | — | — | — | — | — | 1 | — | — | — | — | — | — | — | — |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 0 | 0 | 54 | 0 | 0 | 39 | 0 | 0 | 29 | 0 | 0 | 39 | 0 | 0 | 39 | 0 | 0 | 39 | 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.
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