Surf Forecasts:
Guiones surf forecast from 5 Sep 2026:
- Best quality surf: Saturday 5 Sep, 12AM (local time) - 5ft (1.6m), 16s period, SW swell with glassy winds.
- Most powerful swell: Saturday 5 Sep, 9AM (local time) - 6ft (1.8m), 16s period, SW swell with 1,552 kJ wave energy.
- Next surfable swell (1★+): Saturday 5 Sep, 12AM (local time) - 5ft (1.6m), 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 (Sep 05) at 12AM. The primary swell is predicted to be 1.6m and 16s period with a secondary swell of 0.6m and 11s. The wind is predicted to be glassy as the swell arrives.
The most powerful waves expected at Guiones in the next 16 days are 1.8m 16s and forecast to arrive on Saturday (Sep 05) at 9AM. Winds are predicted to be glassy at the time the swell arrives.
| Wave Type | Time (CST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 12AM (Sat 5th Sep) | 5ft (1.6m) 16s |
| Best Surf | 12AM (Sat 5th Sep) | 5ft (1.6m) 16s |
| Most Powerful | 9AM (Sat 5th Sep) | 6ft (1.8m) 16s |
Table - best surf conditions forecast for Guiones over the next 16 days.
The Lowdown
Alright, Rusty here, breaking down the next two weeks in feet and knots.
The first real swell kicks in on September 4th, and we’re talking about Guiones. The water is 87°, which is about 4° warmer than usual for this time of year – very warm, so trunks or a light top will do.
The best session of the whole period is Saturday morning, September 5th. The swell is 6 feet from the SW, with a 16-second period. That’s a long-period groundswell with moderate-to-strong energy (1578). The wind is glassy from the ESE at 3 knots, so the waves will be clean and well-shaped. This is excellent for experienced surfers. The break is exposed, and the SW direction will wrap in nicely.
The next highlight is Thursday morning, September 10th. The swell is 4 feet from the SW, 17-second period, and a light offshore from the E at 3 knots. The energy is strong (1137), and the conditions are again excellent. These two mornings are the standouts.
The 6th of September has a 5-foot swell with glassy conditions in the morning, but it’s a touch smaller.
The 8th has a 3-foot swell with offshore winds from the E at 6 knots, making for a clean, small wave day.
The 14th of September has a very small 2-foot swell, but the period is 19 seconds – very long-period groundswell. The morning is glassy, but it’s tiny.
The 16th of September morning has a 3-foot swell with glassy conditions from the ESE at 3 knots. It’s a moderate-energy session (565), and worth a look.
The 18th of September morning has a 2-foot swell with a massive 21-second period and calm winds. That’s a long-range, glassy, but very small groundswell – only for the patient and the point break specialists.
Crowds at Guiones are often there, so don’t expect solitude.
Rusty out.
Short Range ForecastHeavy rain (total 58mm), heaviest during Fri night. Warm (max 30°C on Sun morning, min 26°C on Fri night). Wind will be generally light. | Days 5-7 Weather SummaryModerate rain (total 13mm), heaviest on Wed afternoon. Warm (max 30°C on Tue morning, min 26°C on Mon afternoon). Wind will be generally light. | |||||||||||||||||||
Fri 4 | Saturday 5 | Sunday 6 | Monday 7 | Tuesday 8 | Wednesday 9 | Thursday 10 | ||||||||||||||
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 17 | SW 16 | SW 16 | SW 16 | SW 15 | SW 14 | SW 14 | SW 14 | SW 14 | SW 14 | SW 13 | SW 13 | SW 13 | SW 16 | SW 16 | SW 16 | SW 18 | SW 17 | SW 16 | SW 16 |
Wave Graph  | ||||||||||||||||||||
 kJ | 1519 | 1314 | 1552 | 1265 | 949 | 833 | 763 | 581 | 507 | 357 | 290 | 249 | 224 | 302 | 427 | 437 | 871 | 1074 | 823 | 897 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | glassy | glassy | cross-on | glassy | glassy | on | cross | cross | cross-on | cross-off | off | cross | glassy | glassy | cross-on | off | off | cross | off |
High Tide | 7:53PM1.81m | 8:20AM2.02m | 9:02PM1.75m | 9:32AM1.96m | 10:20PM1.75m | 10:49AM1.95m | 11:37PM1.85m | 12:01PM2.01m | 00:42AM2.00m | 1:02PM2.10m | 1:36AM2.16m | 1:56PM2.19m | 2:24AM2.29m | |||||||
Low Tide | 1:57AM0.49m | 2:52PM0.46m | 3:08AM0.56m | 4:06PM0.48m | 4:28AM0.57m | 5:20PM0.44m | 5:45AM0.51m | 6:24PM0.34m | 6:51AM0.40m | 7:20PM0.24m | 7:47AM0.27m | 8:08PM0.16m | ||||||||
 |  |  | | | | | | | |  |  | | | | |  | | | | |
 | — | — | 5:33 | — | — | 5:33 | — | — | 5:33 | — | — | 5:33 | — | — | 5:31 | — | — | 5:31 | — | — |
 | 5:50 | — | — | 5:49 | — | — | 5:47 | — | — | 5:47 | — | — | 5:46 | — | — | 5:46 | — | — | 5:45 | — |
mm | 3 | 11 | — | 5 | 6 | — | 2 | 21 | 10 | 1 | — | — | 5 | — | 1 | 6 | — | — | 2 | 1 |
Temp °C | 29 | 28 | 29 | 29 | 28 | 30 | 29 | 27 | 27 | 27 | 26 | 30 | 30 | 27 | 29 | 29 | 27 | 30 | 30 | 28 |
Feels °C | 33 | 32 | 32 | 32 | 33 | 33 | 33 | 32 | 29 | 31 | 30 | 32 | 33 | 31 | 33 | 32 | 31 | 32 | 32 | 32 |
Swell 1 Height (m) Direction Period (s) | SW 17 | SW 16 | SW 16 | SW 16 | SW 15 | SW 14 | SW 14 | SW 14 | SW 14 | SW 14 | SW 6 | SW 13 | SW 13 | SW 16 | SW 16 | SW 16 | SW 18 | SW 17 | SW 16 | SW 16 |
| kJ | 1519 | 1314 | 1552 | 1265 | 949 | 833 | 763 | 581 | 507 | 357 | 120 | 249 | 199 | 302 | 427 | 437 | 871 | 1074 | 823 | 897 |
Swell 2 Height (m) Direction Period (s) | S 11 | S 11 | WNW 9 | S 7 | S 6 | SSW 7 | SSW 7 | S 7 | SW 7 | SW 7 | SW 13 | WSW 7 | SW 17 | SW 12 | SW 12 | SW 12 | S 11 | SSE 10 | S 10 | S 10 |
| kJ | 89 | 88 | 16 | 33 | 22 | 48 | 47 | 47 | 39 | 65 | 290 | 45 | 224 | 154 | 147 | 120 | 38 | 36 | 49 | 47 |
Swell 3 Height (m) Direction Period (s) | SW 11 | W 9 | S 11 | WNW 9 | WNW 8 | W 8 | W 8 | SW 7 | S 7 | S 7 | SW 18 | SW 18 | W 7 | W 11 | WNW 10 | WNW 10 | WNW 10 | NW 10 | WNW 10 | WNW 10 |
| kJ | 41 | 15 | 10 | 15 | 14 | 5 | 5 | 23 | 31 | 31 | 155 | 246 | 22 | 82 | 36 | 36 | 20 | 27 | 20 | 20 |
Wind waves Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | S 7 | WNW 7 | — | — | — |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 15 | 4 | — | — | — |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 96 | 0 | 0 | 195 | 0 | 0 | 31 | 3 | 3 | 39 | 0 | 0 | 3 | 0 | 0 | 31 | 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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