Surf Forecasts:
Cabo Blanco surf forecast from 18 Aug 2026:
- Best quality surf: Wednesday 19 Aug, 1AM (local time) - 3ft (0.9m), 16s period, SW swell with glassy winds.
- Most powerful swell: Thursday 20 Aug, 10PM (local time) - 4.5ft (1.4m), 12s period, SSW swell with 530 kJ wave energy.
- Next surfable swell (1★+): Tuesday 18 Aug, 1AM (local time) - 3ft (0.9m), 14s period with SW swell.
Best Forecast Surf Conditions for Cabo Blanco this week:
The surf forecast for Cabo Blanco over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Tuesday (Aug 18) at 1AM. The primary swell is predicted to be 0.9m and 14s period with a secondary swell of 0.9m and 7s. The wind is predicted to be cross-offshore as the swell arrives.
The most powerful waves expected at Cabo Blanco in the next 16 days are 1.4m 12s and forecast to arrive on Thursday (Aug 20) at 10PM. Winds are predicted to be cross-shore at the time the swell arrives.
| Wave Type | Time (EST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 1AM (Tue 18th Aug) | 3ft (0.9m) 14s |
| Best Surf | 1AM (Wed 19th Aug) | 3ft (0.9m) 16s |
| Most Powerful | 10PM (Thu 20th Aug) | 4.5ft (1.4m) 12s |
Table - best surf conditions forecast for Cabo Blanco over the next 16 days.
The Lowdown
Alright, surfers, it’s Rusty here. Let’s get into the forecast for Cabo Blanco.
We’ve got a solid run of swell on the way, but it’s a slow burner at first. The water is sitting at 87°, which is much warmer than normal for this time of year – you’ll be feeling that tropical bathwater.
The first real action worth paddling for is Monday morning, August 17th. We’ve got a glassy, clean 3ft of southwest groundswell rolling in with a 14-second period. The energy is moderate (390), and with the wind completely calm, the surface will be like a mirror. It’s a small, clean start to the week.
The glassy conditions continue through Tuesday morning and Wednesday morning, with the swell holding around 2ft to 3ft. The wind switches to a light offshore from the ESE, keeping things clean. The best sessions will definitely be the mornings.
Thursday the 20th is a standout. Morning glass and a bump in size to 3ft from the SSW, but the period drops to 10 seconds. Still, with zero wind, it’s a fine window for some fun little waves.
But the absolute best of the first week is Friday morning, August 21st. We’re looking at a clean 5ft of SSW swell, and the wind is dead calm, glassy as can be. The energy is starting to build (493), and it’s going to be just beautiful out there. That’s the one to circle on the calendar.
After that, the swell drops back a bit over the weekend and into the following week, with the mornings staying clean and glassy. The size hangs around 2ft to 3ft, but the energy is moderate. It’s still a good time to be out, just not as punchy.
Now, looking ahead to the second week, there’s a promising pulse on the horizon. Saturday morning, August 29th, we see a jump in energy (836) with a 3ft SW groundswell. Glassy conditions again. That’s a promising sign.
Then Sunday, August 30th morning is the real standout of the whole forecast. The combined energy is pumping at 1176, with a solid 5ft of SW groundswell and a 16-second period. That’s a long-period groundswell that will wrap in beautifully. With the wind glassy, this is a session for experienced surfers. It’s going to be a big, clean, powerful day. That’s your best bet for the whole 16 days.
That energy carries into Monday the 31st and Tuesday, September 1st mornings, with clean 5ft and 3ft swells but slightly less energy. Still very good, but the Sunday morning is the one.
So, keep your eyes on the mornings, especially Friday the 21st for the cleanest combo of size and glass, and Sunday the 30th for the big, powerful groundswell. This is a great run for Cabo Blanco.
Rusty out.
Short Range ForecastHeavy rain (total 35mm), heaviest during Mon night. Warm (max 28°C on Tue morning, min 24°C on Mon night). Wind will be generally light. | Days 5-7 Weather SummaryModerate rain (total 11mm), heaviest on Sat afternoon. Warm (max 29°C on Fri morning, min 25°C on Thu night). Wind will be generally light. | |||||||||||||||||||
Mon 17 | Tuesday 18 | Wednesday 19 | Thursday 20 | Friday 21 | Saturday 22 | Sunday 23 | ||||||||||||||
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 14 | SW 14 | SW 15 | SW 16 | SW 15 | SW 14 | SSW 10 | SSW 10 | SSW 11 | SSW 12 | SSW 11 | SSW 11 | SSW 10 | S 10 | S 10 | SSW 10 | SSW 14 | SW 18 | SSW 18 |
Wave Graph | ||||||||||||||||||||
280 | 268 | 288 | 258 | 362 | 217 | 214 | 163 | 166 | 394 | 512 | 455 | 447 | 270 | 204 | 196 | 154 | 121 | 168 | 216 | |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | cross-off | glassy | glassy | glassy | glassy | on | cross-off | glassy | glassy | cross | glassy | on | cross | glassy | cross-on | cross | glassy | cross-on | glassy |
High Tide | 7:01PM2.80m | 7:21AM2.92m | 7:44PM2.60m | 8:03AM2.73m | 8:30PM2.40m | 8:48AM2.53m | 9:21PM2.22m | 9:40AM2.37m | 10:24PM2.09m | 10:44AM2.26m | 11:39PM2.05m | 11:56AM2.24m | 00:52AM2.11m | |||||||
Low Tide | 1:06AM0.39m | 1:39PM0.45m | 1:48AM0.59m | 2:23PM0.61m | 2:32AM0.78m | 3:13PM0.77m | 3:23AM0.95m | 4:13PM0.89m | 4:25AM1.08m | 5:23PM0.94m | 5:38AM1.12m | 6:32PM0.90m | ||||||||
— | — | 6:24 | — | — | 6:24 | — | — | 6:24 | — | — | 6:24 | — | — | 6:24 | — | — | 6:24 | — | — | |
6:47 | — | — | 6:46 | — | — | 6:46 | — | — | 6:45 | — | — | 6:45 | — | — | 6:45 | — | — | 6:45 | — | |
mm | 10 | 11 | 1 | 4 | — | — | 2 | 6 | 1 | 4 | — | — | — | 1 | — | 4 | 1 | 1 | 6 | 4 |
Temp °C | 27 | 25 | 28 | 28 | 26 | 28 | 28 | 26 | 28 | 28 | 26 | 29 | 29 | 27 | 29 | 28 | 27 | 29 | 29 | 27 |
Feels °C | 31 | 29 | 33 | 32 | 31 | 33 | 32 | 30 | 32 | 33 | 30 | 33 | 32 | 32 | 32 | 31 | 31 | 33 | 33 | 32 |
Swell 1 Height (m) Direction Period (s) | SSW 7 | S 7 | SSW 8 | SSW 8 | SSW 9 | SSW 9 | SSW 9 | SSW 10 | SSW 10 | SSW 11 | SSW 12 | SSW 11 | SSW 11 | SSW 10 | S 10 | S 10 | SSW 10 | S 9 | S 10 | S 10 |
136 | 83 | 123 | 99 | 137 | 129 | 143 | 163 | 166 | 394 | 512 | 455 | 447 | 270 | 204 | 196 | 154 | 113 | 115 | 115 | |
Swell 2 Height (m) Direction Period (s) | SW 14 | SW 14 | SW 14 | SW 15 | SW 16 | SW 15 | SW 14 | SW 14 | SSW 13 | S 12 | SW 19 | SSW 18 | SSW 18 | SW 16 | SW 16 | SSW 15 | SSW 14 | SSW 14 | SSW 13 | SSW 18 |
280 | 268 | 288 | 258 | 362 | 217 | 214 | 160 | 116 | 47 | 14 | 30 | 30 | 127 | 119 | 142 | 134 | 121 | 116 | 216 | |
Swell 3 Height (m) Direction Period (s) | S 10 | WSW 6 | S 13 | S 12 | NW 8 | WSW 6 | — | S 14 | S 13 | SW 18 | SW 16 | — | SW 15 | S 11 | SSW 21 | SW 20 | SW 20 | SW 19 | SW 18 | SSW 13 |
18 | 15 | 3 | 3 | 2 | 3 | — | 4 | 29 | 12 | 10 | — | 8 | 38 | 44 | 61 | 60 | 96 | 168 | 114 | |
Wind waves Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 16 | 0 | 0 | 0 | 0 | 0 | 16 | 0 | 0 | 0 | 15 | 0 | 143 | 7 | 0 | 15 | 15 | 0 | 16 | 0 |
Best forecast wave conditions in Golfo Dulce | ||||||||||||||||||||
Best forecast wave conditions in Costa Rica | ||||||||||||||||||||
Header Global | ||||||||||||||||||||
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Information about the Cabo Blanco Surf forecast
The above surf forecast table for Cabo Blanco provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Cabo Blanco can be found by selecting the local surf guide option on the grey menu. Our Cabo Blanco 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 (Cabo Blanco) 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 Cabo Blanco 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.
Are you planning a holiday in Golfo Dulce? If you are looking for accommodation near Cabo Blanco, camping, hotels and holiday cottages in Golfo Dulce, consider staying in Golfito which is 31 km (19 miles) away. Other places in and around Golfo Dulce where you can find information about places to rent, and car hire include Puerto Armuelles which is 32 km (20 miles) away, La Concepcion, Pedregal and David.











