
Surf Forecasts:
Guiones surf forecast from 14 Sep 2026:
- Best quality surf: Monday 14 Sep, 6PM (local time) - 2.5ft (0.8m), 18s period, SW swell with glassy winds.
- Most powerful swell: Wednesday 16 Sep, 12PM (local time) - 3.5ft (1.1m), 16s period, SW swell with 644 kJ wave energy.
- Next surfable swell (1★+): Monday 14 Sep, 3AM (local time) - 2ft (0.6m), 19s 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 Monday (Sep 14) at 3AM. The primary swell is predicted to be 0.6m and 19s period with a secondary swell of 0.7m and 9s. Another secondary swell of 0.6m and 13s is also forecast. The wind is predicted to be offshore as the swell arrives.
The most powerful waves expected at Guiones in the next 16 days are 1.1m 16s and forecast to arrive on Wednesday (Sep 16) at 12PM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.2m 6s period and expected on Monday (Sep 14) at 9AM.
| Wave Type | Time (CST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 3AM (Mon 14th Sep) | 2ft (0.6m) 19s |
| Best Surf | 6PM (Mon 14th Sep) | 2.5ft (0.8m) 18s |
| Most Powerful | 12PM (Wed 16th Sep) | 3.5ft (1.1m) 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 coming our way for the next couple of weeks. It’s a bit of a slow burner, but there’s some real magic waiting for us if we’re patient.
We’re kicking things off with a bit of a wait. The first proper window of decent surf doesn’t really open up until Monday morning the 14th. Before that, it’s all a bit messy with afternoon storms and onshore breezes. Once we hit Monday the 14th, the pattern shifts. The water is sitting at a very warm 87°F, which is a solid 4°F warmer than usual for this time of year – that’s a notable jump, so you can leave the thick suit at home.
The standout session of the whole run, and honestly the one I’m most excited about, is Tuesday morning the 15th at Guiones. We’re looking at a clean 2ft glassy swell from the SW. The combined energy is a solid 560 (moderate energy), but with that 18-second period, it's a proper long-period groundswell that will wrap in with some real push. The wind is dead calm – glassy as can be – and the early morning will be pure magic. It’s a consistent spot, but it can get busy, so get out there early for the cleanest waves.
Following that, Wednesday morning the 16th is another cracker. The swell has bumped up a touch to 3ft from the SW with a 16-second period, and the energy is even stronger at 770 (moderate energy). The wind is offshore, glassy conditions again. This is a great follow-up day if you missed Tuesday.
Looking further ahead, Sunday morning the 20th looks like a beauty. The swell is back to 3ft from the SW, with a long 19-second period, and the combined energy is a strong 765. With the wind going dead calm and glassy, this is another morning to circle on your calendar. The swell direction is a perfect match for what Guiones likes.
There’s a bit of a gap in quality in the middle of the second week, but things get big and interesting towards the end. On Saturday the 26th, a serious pulse is forecast. The swell jumps to a massive 13ft, then 16ft, from the S. The combined energy hits 10,661 (very strong energy). But listen, that's expert territory only – over 8ft, this break is for the brave and the skilled. The wind is offshore and glassy, so the conditions will be there, but the raw power is not for everyone. If you’re not an expert, stay on the sand and watch. This is also a long-period swell, which will make the sets very clean and powerful, but with a period of 10-11 seconds, it's not overly drawn out.
After that, things settle down again. Sunday morning the 27th offers a much more manageable 6ft from the SW, with a short 8-second period and glassy winds. It’s clean, but the short period means it won't have the same punch as the previous days.
All in all, the first week has two or three absolute gems of glassy mornings. The second week is a mixed bag that builds to a massive, expert-only peak before calming down again. Stay patient, pick your windows, and you’ll be rewarded.
Rusty.
Short Range ForecastHeavy rain (total 24mm), heaviest during Tue night. Warm (max 30°C on Tue morning, min 25°C on Tue night). Wind will be generally light. | Days 5-7 Weather SummaryLight rain (total 7mm), mostly falling on Wed afternoon. Warm (max 30°C on Fri morning, min 26°C on Wed night). Wind will be generally light. | |||||||||||||||||||
Sun 13 | Monday 14 | Tuesday 15 | Wednesday 16 | Thursday 17 | Friday 18 | Saturday 19 | ||||||||||||||
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 13 | SW 19 | SW 19 | SW 18 | SW 18 | SW 18 | SW 17 | SW 16 | SW 16 | SW 16 | SW 15 | SW 14 | SW 14 | SW 14 | SW 13 | SW 20 | SW 19 | SW 19 | SW 13 | SW 18 |
Wave Graph | ||||||||||||||||||||
138 | 299 | 219 | 246 | 379 | 249 | 499 | 432 | 502 | 620 | 418 | 407 | 401 | 276 | 205 | 239 | 236 | 224 | 167 | 325 | |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross-off | off | glassy | cross-off | glassy | cross | cross-off | glassy | cross-on | glassy | glassy | cross-on | cross-off | glassy | on | glassy | glassy | on | glassy |
High Tide | 4:09PM2.23m | 4:27AM2.37m | 4:49PM2.16m | 5:05AM2.28m | 5:28PM2.05m | 5:44AM2.17m | 6:08PM1.93m | 6:23AM2.03m | 6:51PM1.79m | 7:07AM1.89m | 7:39PM1.66m | 7:57AM1.77m | 8:38PM1.57m | |||||||
Low Tide | 10:14PM0.14m | 10:43AM0.13m | 10:53PM0.21m | 11:23AM0.20m | 11:31PM0.32m | 12:03PM0.30m | 00:10AM0.44m | 12:44PM0.42m | 00:51AM0.56m | 1:31PM0.55m | 1:39AM0.68m | 2:27PM0.65m | 2:38AM0.78m | |||||||
— | — | 5:31 | — | — | 5:31 | — | — | 5:31 | — | — | 5:31 | — | — | 5:31 | — | — | 5:31 | — | — | |
5:44 | — | — | 5:43 | — | — | 5:43 | — | — | 5:42 | — | — | 5:42 | — | — | 5:40 | — | — | 5:39 | — | |
mm | 4 | 3 | — | — | — | — | 6 | 11 | — | 4 | 1 | — | — | — | — | — | 2 | — | 1 | 5 |
Temp °C | 29 | 27 | 29 | 29 | 26 | 30 | 29 | 26 | 29 | 28 | 27 | 28 | 29 | 27 | 30 | 29 | 28 | 29 | 29 | 28 |
Feels °C | 34 | 31 | 33 | 34 | 29 | 33 | 31 | 28 | 32 | 31 | 31 | 32 | 31 | 31 | 33 | 33 | 33 | 34 | 32 | 33 |
Swell 1 Height (m) Direction Period (s) | S 9 | S 9 | S 8 | S 8 | SW 18 | S 8 | SW 17 | SW 16 | SW 16 | SW 16 | SW 15 | SW 14 | SW 14 | SW 14 | SW 13 | SW 13 | SW 13 | SW 13 | SW 13 | SW 18 |
99 | 73 | 71 | 92 | 379 | 108 | 499 | 432 | 502 | 620 | 418 | 407 | 401 | 276 | 205 | 205 | 205 | 170 | 167 | 325 | |
Swell 2 Height (m) Direction Period (s) | SW 13 | SW 13 | SW 19 | SW 18 | S 8 | SW 14 | S 8 | S 8 | S 8 | SSW 8 | SSW 8 | S 10 | S 9 | S 9 | S 8 | S 9 | SW 19 | SW 19 | S 9 | SW 12 |
138 | 134 | 219 | 246 | 92 | 203 | 111 | 108 | 105 | 112 | 68 | 92 | 78 | 73 | 51 | 52 | 236 | 224 | 56 | 118 | |
Swell 3 Height (m) Direction Period (s) | SW 20 | SW 19 | SW 12 | SW 12 | SW 12 | SW 18 | SW 13 | SW 13 | SW 13 | W 13 | S 10 | SW 22 | SW 22 | SW 21 | SW 20 | SW 20 | S 9 | S 9 | SW 18 | S 8 |
60 | 299 | 73 | 71 | 69 | 249 | 109 | 128 | 163 | 13 | 18 | 75 | 163 | 220 | 196 | 239 | 39 | 55 | 154 | 50 | |
Wind waves Height (m) Direction Period (s) | — | — | N 6 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
— | — | 3 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 14 | 0 | 0 | 0 | 0 | 0 | 14 | 0 | 0 | 39 | 0 | 0 | 312 | 0 | 0 | 31 | 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.










