Surf Forecasts:
Guiones surf forecast from 8 Sep 2026:
- Best quality surf: Thursday 10 Sep, 3AM (local time) - 4.5ft (1.3m), 18s period, SW swell with offshore winds.
- Most powerful swell: Thursday 10 Sep, 3AM (local time) - 4.5ft (1.3m), 18s period, SW swell with 1,087 kJ wave energy.
- Next surfable swell (1★+): Monday 7 Sep, 9PM (local time) - 3.5ft (1.0m), 13s 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 07) at 9PM. The primary swell is predicted to be 1.0m and 13s period with a secondary swell of 0.5m and 6s. 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 1.3m 18s and forecast to arrive on Thursday (Sep 10) at 3AM. Winds are predicted to be offshore at the time the swell arrives.
| Wave Type | Time (CST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 9PM (Mon 7th Sep) | 3.5ft (1.0m) 13s |
| Best Surf | 3AM (Thu 10th Sep) | 4.5ft (1.3m) 18s |
| Most Powerful | 3AM (Thu 10th Sep) | 4.5ft (1.3m) 18s |
Table - best surf conditions forecast for Guiones over the next 16 days.
The Lowdown
Alright, this is Rusty. Let's have a look at what's coming up at Guiones.
Alright, folks, we've got a solid run of surf ahead at Guiones. The water is warm, sitting at 87° – that's much warmer than usual for this time of year, which is a real treat. The opening days are looking promising with a clean, long-period groundswell from the SW.
Monday the 7th morning kicks things off with a clean 4 ft SW swell, period a solid 14 seconds, and a light cross-off breeze. The combined energy is moderate (671). It’s a good start, but the real standout is shaping up for Thursday the 10th. That morning, we’re looking at glassy conditions, a 4 ft SW swell with a 17-second period, and the combined energy jumps up to a strong 1128. That’s the best call of the week for experienced surfers, no doubt about it.
Tuesday the 8th and Wednesday the 9th mornings are also clean with similar 3 ft SW swell, so there’s plenty of fun to be had. Friday the 11th morning is clean again with a 4 ft SW swell. The afternoons, however, are mostly a write-off with onshore winds and the risk of storms, so make sure you’re on it early.
Looking into the second week, the pattern holds with cleaner mornings. Saturday the 12th and Sunday the 13th start off glassy, though the swell drops a bit to 3 ft and 2 ft. The combined energy drops into the moderate range (472 and 260). Monday the 14th morning is glassy with a tiny 2 ft swell but a very long 19-second period. That long period might make it a bit tricky at the beach, but it’ll be clean. Tuesday the 15th and Wednesday the 16th mornings are also glassy, with the swell building back to 2 ft and 4 ft respectively. The energy picks up nicely on the 16th (641).
The last few days from the 17th to the 22nd see a mix of glassy mornings and more onshore chop in the afternoons. The swell stays in the 2 ft to 4 ft range, with the period dropping to 11-13 seconds towards the end. The combined energy stays moderate. There’s no real standout here, but the mornings will still offer some clean waves if you’re keen.
So, to sum it up: get on it early, and your best bet is the morning of Thursday the 10th. That’s the one to circle.
Rusty.
Short Range ForecastModerate rain (total 12mm), heaviest on Wed afternoon. Warm (max 30°C on Wed morning, min 26°C on Mon night). Wind will be generally light. | Days 5-7 Weather SummaryModerate rain (total 16mm), heaviest on Thu afternoon. Warm (max 30°C on Fri morning, min 26°C on Thu night). Wind will be generally light. | |||||||||||||||||||
Mon 7 | Tuesday 8 | Wednesday 9 | Thursday 10 | Friday 11 | Saturday 12 | Sunday 13 | ||||||||||||||
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 14 | SW 13 | SW 13 | SW 13 | SW 16 | SW 16 | SW 16 | SW 18 | SW 17 | SW 16 | SW 16 | SW 16 | SW 15 | SW 14 | SW 14 | SW 14 | SW 13 | SW 21 | SW 13 | SW 19 |
Wave Graph  | ||||||||||||||||||||
 kJ | 404 | 290 | 249 | 224 | 302 | 427 | 437 | 871 | 1074 | 823 | 897 | 701 | 631 | 459 | 398 | 341 | 215 | 140 | 138 | 299 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | glassy | glassy | cross-on | cross-off | off | cross | off | glassy | cross-on | off | glassy | cross-on | cross-off | off | cross-on | glassy | glassy | cross | glassy |
High Tide | 11:37PM1.85m | 12:01PM2.01m | 00:42AM2.00m | 1:02PM2.10m | 1:36AM2.16m | 1:56PM2.19m | 2:24AM2.29m | 2:44PM2.24m | 3:07AM2.37m | 3:28PM2.26m | 3:48AM2.40m | 4:09PM2.23m | ||||||||
Low Tide | 5:20PM0.44m | 5:45AM0.51m | 6:24PM0.34m | 6:51AM0.40m | 7:20PM0.24m | 7:47AM0.27m | 8:08PM0.16m | 8:36AM0.17m | 8:53PM0.11m | 9:21AM0.11m | 9:34PM0.10m | 10:03AM0.09m | 10:14PM0.14m | |||||||
 |  | | |  |  | | |  | | | | |  | | |  | |  | | |
 | — | — | 5:33 | — | — | 5:31 | — | — | 5:31 | — | — | 5:31 | — | — | 5:31 | — | — | 5:31 | — | — |
 | 5:47 | — | — | 5:46 | — | — | 5:46 | — | — | 5:45 | — | — | 5:45 | — | — | 5:45 | — | — | 5:44 | — |
mm | 1 | — | 1 | 4 | — | — | 6 | — | — | 5 | — | — | 3 | 1 | — | 2 | 4 | 1 | — | 7 |
Temp °C | 29 | 28 | 29 | 29 | 27 | 30 | 29 | 27 | 29 | 28 | 26 | 30 | 29 | 27 | 30 | 29 | 28 | 28 | 28 | 27 |
Feels °C | 33 | 33 | 34 | 32 | 32 | 32 | 31 | 31 | 31 | 32 | 29 | 32 | 33 | 31 | 32 | 32 | 32 | 32 | 31 | 31 |
Swell 1 Height (m) Direction Period (s) | SW 14 | SW 13 | SW 13 | SW 13 | SW 16 | SW 16 | SW 16 | SW 18 | SW 17 | SW 16 | SW 16 | SW 16 | SW 15 | SW 14 | SW 14 | SW 14 | SW 13 | SW 13 | S 9 | S 8 |
| kJ | 404 | 290 | 249 | 199 | 302 | 427 | 437 | 871 | 1074 | 823 | 897 | 701 | 631 | 459 | 398 | 341 | 215 | 140 | 74 | 86 |
Swell 2 Height (m) Direction Period (s) | WSW 6 | SW 18 | SW 18 | SW 17 | SW 12 | SW 12 | SW 12 | S 11 | S 10 | S 10 | S 10 | S 10 | S 7 | S 10 | S 10 | S 9 | S 9 | S 9 | SW 13 | SW 19 |
| kJ | 26 | 155 | 246 | 224 | 154 | 147 | 120 | 38 | 53 | 71 | 68 | 69 | 33 | 45 | 65 | 57 | 55 | 74 | 138 | 299 |
Swell 3 Height (m) Direction Period (s) | S 6 | S 6 | W 11 | WNW 11 | WNW 11 | W 10 | WNW 10 | WNW 10 | WNW 10 | WNW 10 | WNW 10 | WNW 10 | WNW 10 | WNW 10 | WNW 10 | SW 18 | SW 21 | SW 21 | SW 20 | SW 13 |
| kJ | 30 | 20 | 84 | 39 | 37 | 55 | 35 | 34 | 20 | 20 | 20 | 19 | 10 | 9 | 9 | 80 | 71 | 112 | 60 | 134 |
Wind waves Height (m) Direction Period (s) | — | — | — | SW 6 | — | — | S 7 | — | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | — | — | — | 9 | — | — | 16 | — | — | — | — | — | — | — | — | — | — | — | — | — |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 0 | 39 | 0 | 0 | 39 | 0 | 0 | 29 | 0 | 0 | 39 | 0 | 0 | 95 | 0 | 0 | 39 | 0 | 0 | 39 |
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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