Surf Forecasts:
Guiones surf forecast from 8 Aug 2026:
- Best quality surf: Friday 14 Aug, 6PM (local time) - 4ft (1.2m), 18s period, SW swell with glassy winds.
- Most powerful swell: Saturday 15 Aug, 12AM (local time) - 4.5ft (1.4m), 17s period, SW swell with 1,160 kJ wave energy.
- Next surfable swell (1★+): Saturday 8 Aug, 6PM (local time) - 3.5ft (1.0m), 15s 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 08) at 6PM. The primary swell is predicted to be 1.0m and 15s period with a secondary swell of 0.6m and 9s. The wind is predicted to be glassy as the swell arrives.
The most powerful waves expected at Guiones in the next 16 days are 1.4m 17s and forecast to arrive on Saturday (Aug 15) at 12AM. Winds are predicted to be cross-offshore at the time the swell arrives.
| Wave Type | Time (CST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 6PM (Sat 8th Aug) | 3.5ft (1.0m) 15s |
| Best Surf | 6PM (Fri 14th Aug) | 4ft (1.2m) 18s |
| Most Powerful | 12AM (Sat 15th Aug) | 4.5ft (1.4m) 17s |
Table - best surf conditions forecast for Guiones over the next 16 days.
The Lowdown
Alright, Rusty here. Let's break down what's coming for our local spot.
We’ve got a good run of small but clean surf starting right now. The water is 86°F, which is much warmer than normal for this time of year, so leave the wetsuit at home. The big one to circle is the morning of Saturday, August 15th, when a clean 5ft swell from the southwest, with a long 16-second period, rolls in. That’s a groundswell with some real punch, with combined energy hitting 1287 – that’s strong. This one is for the experienced crew only; it’s too big for beginners.
Saturday morning, August 8th starts us off clean with a 3ft SW swell (16-second period) and an offshore ENE breeze at 6 mph. Energy is moderate at 559, and conditions are very good. The afternoon turns a bit cross-onshore, so mornings are the call.
Sunday morning, August 9th is another clean one: 4ft SW swell, 14-second period, light offshore wind. Good energy at 538. Sunday afternoon gets a bit crossed up.
Monday the 10th and Tuesday the 11th keep the morning trend going – clean 3ft to 3ft SW swells, light offshores, with energy in the 300-400 range. Nice small-wave fun.
Wednesday the 12th and Thursday the 13th mornings stay clean, with 2ft swells and glassy or near-calm winds. Thursday morning is particularly glassy.
Then we get the build. Friday morning, August 14th sees a jump to 4ft SW swell with a very long 18-second period and offshore wind. Energy is a hefty 939. A preview of what’s coming.
Saturday, August 15th morning is the standout – 5ft SW, 16-second period, clean offshore wind. Energy is 1287, which is proper. Excellent conditions for experienced surfers. The afternoon gets a bit messy with a cross-shore, so get out early.
Sunday the 16th and Monday the 17th mornings have 4ft and 4ft swells respectively, with a moderate offshore breeze (12 mph) keeping things clean. Good energy in the 600-800 range.
Tuesday the 18th and Wednesday the 19th mornings look glassy again, with 4ft and 3ft swells. Perfect for a quiet session.
After that, the surf drops off into the second week, with 3ft down to 1ft swells through to the 23rd. The mornings will stay glassy or clean, but it’s small. The best bet in that stretch is Sunday, August 23rd morning – a tiny 1ft swell but with a very long 20-second period and glassy conditions. Weak energy (297), but fun on a longboard for the dedicated.
So, to sum it up: aim for Saturday, August 15th morning for the most power. For the rest, mornings are the way to go.
Rusty.
Short Range ForecastMostly dry. Warm (max 31°C on Sun morning, min 25°C on Sun night). Wind will be generally light. | Days 4-6 Weather SummaryModerate rain (total 17mm), heaviest on Wed night. Warm (max 29°C on Tue morning, min 25°C on Thu night). Wind will be generally light. | ||||||||||||||||||||
Saturday 8 | Sunday 9 | Monday 10 | Tuesday 11 | Wednesday 12 | Thursday 13 | Friday 14 | |||||||||||||||
AM | 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 16 | SW 15 | SW 15 | SW 14 | SW 14 | SW 13 | SW 13 | SW 14 | SW 20 | SW 14 | SW 18 | SW 13 | SW 16 | SW 16 | SW 15 | SW 15 | SW 15 | SW 20 | SW 18 | SW 18 | SW 17 |
Wave Graph  | |||||||||||||||||||||
 kJ | 367 | 435 | 309 | 453 | 327 | 241 | 202 | 331 | 186 | 224 | 375 | 212 | 211 | 427 | 181 | 176 | 255 | 373 | 804 | 777 | 1160 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | off | cross-on | cross-off | off | cross | cross-off | off | cross-on | cross-off | off | on | cross-off | off | cross-on | cross | glassy | cross-on | cross-off | off | cross-on | cross-off |
High Tide | 9:45AM2.03m | 10:29PM1.73m | 10:57AM2.04m | 11:44PM1.81m | 12:07PM2.10m | 00:51AM1.94m | 1:11PM2.19m | 1:50AM2.10m | 2:08PM2.27m | 2:43AM2.25m | 2:59PM2.32m | 3:31AM2.36m | 3:47PM2.33m | ||||||||
Low Tide | 4:21PM0.46m | 4:32AM0.53m | 5:32PM0.40m | 5:46AM0.48m | 6:38PM0.29m | 6:55AM0.38m | 7:35PM0.18m | 7:55AM0.27m | 8:27PM0.08m | 8:50AM0.18m | 9:15PM0.02m | 9:40AM0.13m | 10:00PM0.01m | ||||||||
 | |  | | | | | | |  |  |  | | | |  | | | | | | |
 | 5:33 | — | — | 5:33 | — | — | 5:33 | — | — | 5:33 | — | — | 5:33 | — | — | 5:33 | — | — | 5:33 | — | — |
 | — | 6:02 | — | — | 6:02 | — | — | 6:01 | — | — | 6:01 | — | — | 6:00 | — | — | 6:00 | — | — | 6:00 | — |
mm | — | — | — | — | — | — | — | — | — | — | 2 | 1 | — | 4 | 8 | 1 | 1 | — | — | 2 | — |
Temp °C | 30 | 29 | 27 | 31 | 31 | 27 | 30 | 30 | 28 | 29 | 29 | 28 | 29 | 29 | 28 | 29 | 29 | 28 | 30 | 30 | 27 |
Feels °C | 33 | 32 | 29 | 33 | 33 | 30 | 33 | 33 | 32 | 32 | 32 | 33 | 32 | 32 | 33 | 32 | 32 | 33 | 32 | 33 | 31 |
Swell 1 Height (m) Direction Period (s) | SW 16 | SW 15 | SW 15 | SW 14 | SW 14 | SW 13 | SW 13 | SW 14 | SW 15 | SW 14 | SW 14 | SW 13 | SW 16 | SW 16 | SW 15 | S 8 | SW 15 | S 8 | SW 18 | SW 18 | SW 17 |
| kJ | 367 | 435 | 309 | 453 | 327 | 241 | 202 | 331 | 174 | 224 | 221 | 212 | 211 | 427 | 181 | 58 | 255 | 82 | 804 | 777 | 1160 |
Swell 2 Height (m) Direction Period (s) | SW 12 | S 9 | SW 11 | SSW 18 | S 10 | S 10 | SW 16 | S 9 | SW 12 | S 9 | SW 18 | S 9 | SW 13 | S 9 | S 8 | SW 15 | S 8 | SW 16 | S 8 | S 7 | S 12 |
| kJ | 139 | 55 | 79 | 30 | 48 | 47 | 125 | 42 | 87 | 38 | 375 | 58 | 136 | 55 | 50 | 176 | 78 | 251 | 71 | 86 | 178 |
Swell 3 Height (m) Direction Period (s) | S 9 | S 24 | S 9 | S 11 | SSW 18 | SW 16 | S 10 | SW 20 | SW 20 | SW 18 | S 9 | SW 18 | S 9 | S 16 | S 15 | S 14 | S 12 | SW 20 | S 11 | SW 14 | — |
| kJ | 53 | 11 | 39 | 9 | 31 | 125 | 48 | 99 | 186 | 159 | 36 | 152 | 58 | 124 | 109 | 92 | 27 | 373 | 64 | 206 | — |
Wind waves Height (m) Direction Period (s) | — | SW 6 | — | SSE 8 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | — | 5 | — | 46 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 0 | 29 | 0 | 0 | 3 | 0 | 0 | 29 | 0 | 0 | 31 | 0 | 0 | 39 | 2 | 0 | 103 | 0 | 0 | 29 | 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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