Surf Forecasts:
San Juan surf forecast from 15 Aug 2026:
- Most powerful swell: Monday 17 Aug, 7PM (local time) - 4ft (1.2m), 9s period, N swell with 225 kJ wave energy.
Best Forecast Surf Conditions for San Juan this week:
The most powerful waves expected at San Juan in the next 16 days are 1.2m 9s and forecast to arrive on Monday (Aug 17) at 7PM. Winds are predicted to be onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.1m 13s period and expected on Thursday (Aug 20) at 1PM.
| Wave Type | Time (WEST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 7PM (Mon 17th Aug) | 4ft (1.2m) 9s |
Table - best surf conditions forecast for San Juan over the next 16 days.
The Lowdown
Alright, let’s be straight with you. The next couple of weeks are looking pretty grim for a proper surf. We’ve got a solid window of onshore northerly wind that’s not going to let up, and the swell just doesn’t have any push behind it. It’s a classic case of a lot of whitewater and not a lot of quality.
For the first week, from now through the 23rd, you’re looking at messy, junky conditions. The swell hangs around the 2.6ft to 4.9ft mark, but it’s short-period windswell, mostly under 8 seconds, and it’s coming from the north-northeast, which is exactly the wrong direction for this spot. San Juan (San Juan) is a reef break that needs a solid NNW groundswell to really show its stuff, and we’re not getting that at all. The wind is blowing onshore pretty much the whole time, 9 to 19 mph, which is just going to chop it all up. The wave energy is weak to moderate, with combined energy values mostly in the 100s, like 138 to 239. Water temp is 73.2°, which is about average for this time of year. Don't get too excited about the 22nd and 23rd, the swell bumps up slightly to 4.9ft, but it’s still short-period and wind-blown. It’s not going to be any fun.
The second week doesn’t offer much hope either. We’re still stuck in the same pattern. From the 24th through the 28th, expect more of the same: onshore winds, short-period swell, and poor conditions. The swell stays around 3.9ft to 4.9ft, with the energy building a bit, but it’s all for nothing with that wind. This is a blank run, plain and simple.
There is a slight change late in the window, around the 29th and 30th. The swell does start to build, reaching 5.6ft to 6.2ft and the energy jumps up to the 341 to 504 range. But, and it’s a big but, the wind is howling onshore at 19 to 22 mph. This is going to be a full-on windblown mess. If you’re a kitesurfer, this might look interesting, but for a paddle surfer, it’s a write-off. We’re 12 days out, so things could shift, but as it stands now, there’s nothing worth paddling out for. Keep the board in the car and wait for the next one.
Short Range ForecastMostly dry. Warm (max 24°C on Sun afternoon, min 21°C on Sun night). Wind will be generally light. | Days 5-7 Weather SummaryMostly dry. Warm (max 24°C on Wed afternoon, min 21°C on Thu night). Mainly fresh winds. | |||||||||||||||||||
Sat 15 | Sunday 16 | Monday 17 | Tuesday 18 | Wednesday 19 | Thursday 20 | Friday 21 | ||||||||||||||
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) | NNE 7 | NNE 7 | NNE 7 | NNE 7 | N 8 | N 8 | N 9 | N 9 | N 8 | N 8 | N 8 | N 8 | N 8 | N 8 | N 8 | N 8 | N 8 | N 8 | N 8 | N 7 |
Wave Graph  | ||||||||||||||||||||
 kJ | 222 | 186 | 125 | 114 | 198 | 177 | 225 | 188 | 132 | 130 | 135 | 109 | 84 | 108 | 111 | 108 | 130 | 160 | 187 | 177 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | on | on | on | on | on | on | cross-on | on | on | on | cross-on | cross-on | cross-on | cross-on | cross-on | on | on | on | on |
High Tide | 4:12PM2.60m | 4:35AM2.30m | 4:50PM2.44m | 5:11AM2.18m | 5:27PM2.23m | 5:49AM2.04m | 6:07PM1.99m | 6:30AM1.88m | 6:53PM1.77m | 7:22AM1.73m | 7:58PM1.59m | 8:40AM1.62m | 9:36PM1.51m | |||||||
Low Tide | 10:24PM0.06m | 10:31AM0.19m | 11:00PM0.22m | 11:09AM0.33m | 11:35PM0.40m | 11:49AM0.50m | 00:11AM0.59m | 12:34PM0.68m | 00:55AM0.77m | 1:34PM0.84m | 2:00AM0.91m | 3:08PM0.93m | 3:41AM0.96m | |||||||
 |  | |  |  | | | | | | | | | | | | | | | | |
 | — | — | 7:22 | — | — | 7:22 | — | — | 7:24 | — | — | 7:24 | — | — | 7:24 | — | — | 7:24 | — | — |
 | 8:34 | — | — | 8:32 | — | — | 8:31 | — | — | 8:30 | — | — | 8:30 | — | — | 8:29 | — | — | 8:28 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 23 | 22 | 23 | 24 | 22 | 23 | 23 | 22 | 23 | 23 | 22 | 23 | 24 | 22 | 23 | 23 | 22 | 23 | 23 | 22 |
Feels °C | 22 | 20 | 22 | 23 | 21 | 22 | 22 | 22 | 25 | 23 | 22 | 23 | 24 | 23 | 22 | 22 | 21 | 22 | 21 | 20 |
Swell 1 Height (m) Direction Period (s) | NW 10 | NNW 9 | NNE 7 | NNW 9 | N 8 | N 8 | N 9 | N 9 | N 8 | N 8 | N 8 | N 8 | N 8 | N 8 | WNW 10 | WNW 10 | WNW 9 | NW 9 | NW 8 | WNW 8 |
| kJ | 76 | 35 | 125 | 68 | 198 | 177 | 225 | 188 | 132 | 130 | 135 | 109 | 84 | 108 | 37 | 37 | 32 | 19 | 18 | 13 |
Swell 2 Height (m) Direction Period (s) | S 15 | WNW 8 | NNW 9 | WNW 8 | NW 9 | NNW 8 | NNW 8 | WNW 8 | WNW 8 | WNW 8 | WNW 9 | WNW 8 | WNW 8 | WNW 8 | S 13 | S 13 | S 13 | N 8 | WNW 11 | WNW 10 |
| kJ | 4 | 7 | 32 | 6 | 21 | 45 | 7 | 7 | 6 | 6 | 15 | 13 | 13 | 6 | 3 | 3 | 3 | 5 | 12 | 10 |
Swell 3 Height (m) Direction Period (s) | — | — | WNW 8 | — | WNW 8 | WNW 9 | WNW 8 | NNW 8 | S 14 | NW 9 | WNW 9 | S 13 | NW 11 | WNW 10 | — | S 13 | — | NW 12 | — | N 15 |
| kJ | — | — | 6 | — | 6 | 8 | 7 | 6 | 4 | 3 | 8 | 3 | 5 | 10 | — | 3 | — | 6 | — | 4 |
Wind waves Height (m) Direction Period (s) | NNE 7 | NNE 7 | — | NNE 7 | — | — | — | — | — | — | — | — | NNW 3 | — | N 8 | N 8 | N 8 | N 8 | N 8 | N 7 |
| kJ | 222 | 186 | — | 114 | — | — | — | — | — | — | — | — | 4 | — | 111 | 108 | 130 | 160 | 187 | 177 |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 38 | 38 | 38 | 38 | 38 | 17 | 17 | 10 | 10 | 17 | 9 | 38 | 251 | 66 | 251 | 251 | 231 | 38 | 231 | 38 |
Best forecast wave conditions in Lanzarote | ||||||||||||||||||||
Best forecast wave conditions in Spain (Africa) | ||||||||||||||||||||
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Information about the San Juan Surf forecast
The above surf forecast table for San Juan provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at San Juan can be found by selecting the local surf guide option on the grey menu. Our San Juan 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 (San Juan) 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 San Juan 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.
San Juan is 8 km (5 miles) from Teguise. If you plan a holiday in Lanzarote, look for hotels and other accommodation in Teguise. Teguise has rooms for a wide range of budgets as well as car hire and transport links.
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