Surf Forecasts:
San Juan surf forecast from 18 Jul 2026:
- Most powerful swell: Monday 20 Jul, 10AM (local time) - 8ft (2.4m), 8s period, NNE swell with 636 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 2.4m 8s and forecast to arrive on Monday (Jul 20) at 10AM. Winds are predicted to be onshore at the time the swell arrives.
| Wave Type | Time (WEST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 10AM (Mon 20th Jul) | 8ft (2.4m) 8s |
Table - best surf conditions forecast for San Juan over the next 16 days.
The Lowdown
G’day, Rusty here. Gotta be honest – San Juan is looking like a total dud over the next 16 days. Not a single session worth paddling out for. The wind is the killer, blowing onshore from the NNE and N at 12 to 28 mph, and every forecast window gets tagged as “poor surf conditions.” The swell is there, but it’s all junk.
We start Friday afternoon, 17 July, with a 6 ft swell from the NNE, but the period’s a short 7 seconds – weak energy, and that 19 mph onshore wind ruins it. That pattern barely changes through the weekend. Saturday and Sunday, 18 and 19 July, the swell bumps to 7 ft, period stretches to 8 seconds, but the wind stays onshore at 19 to 22 mph. Combined energy climbs, but it’s still messy.
Monday 20 July through Thursday 23 July sees the swell bouncing between 7 ft and 8 ft, periods around 7-8 seconds. Winds are strong, 22-25 mph, onshore all the way. Combined energy gets moderate, but it’s useless with that chop.
Friday 24 July into Saturday 25 July, the swell builds. Saturday morning has 8 ft, 8 seconds, and Saturday afternoon jumps to 10 ft – combined energy gets strong. But the wind is howling onshore at 22-25 mph. At that size, this is expert-only territory, and with the wind, even they’ll struggle. This setup looks more interesting for kite surfing than paddle surfing.
Sunday 26 July is the biggest pulse: 12 ft swell, 9-second period, combined energy of 2124 – very strong energy. But the wind is NNE at 28 mph onshore. It’s a washing machine. That size is only for experts, and with those winds, it’s borderline unsurfable. Monday 27 July drops back to 10 ft then 8 ft, still onshore.
From Tuesday 28 July onward, the wind eases slightly to 12-19 mph, but it’s still onshore or cross-onshore. Swells stay around 6 ft to 8 ft, periods 8 seconds. Confidence is low – the whole run is compromised.
Water temp at San Juan was 73°F on the 17th, with a 3°F anomaly – a touch warmer than normal for this time of year. The rest of the record doesn’t show readings, but expect similar.
To sum it up: there are zero good surf options in this 16-day window. No standouts, no hidden gems. The swell is there, but the wind just won’t let up. For an exposed reef that needs clean conditions, this is a write-off. Keep an eye on the forecasts – things can always change.
Rusty.
Short Range ForecastMostly dry. Warm (max 22°C on Sat afternoon, min 20°C on Fri night). Mainly strong winds. | Days 4-6 Weather SummaryMostly dry. Warm (max 22°C on Wed afternoon, min 20°C on Mon night). Mainly fresh winds. | ||||||||||||||||||||
Saturday 18 | Sunday 19 | Monday 20 | Tuesday 21 | Wednesday 22 | Thursday 23 | Friday 24 | |||||||||||||||
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) | NNE 7 | NNE 7 | NNE 7 | NNE 7 | NNE 7 | NNE 7 | NNE 8 | NNE 8 | NNE 7 | NNE 7 | NNE 7 | NNE 7 | NNE 7 | NNE 7 | NNE 7 | NNE 7 | NNE 8 | NNE 7 | NNE 7 | NNE 8 | NNE 7 |
Wave Graph  | |||||||||||||||||||||
 kJ | 302 | 286 | 290 | 418 | 423 | 482 | 606 | 501 | 475 | 417 | 376 | 345 | 403 | 365 | 392 | 405 | 416 | 394 | 365 | 416 | 405 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | on | on | on | on | on | on | on | on | on | on | on | on | on | on | on | on | on | on | on | on |
High Tide | 5:09AM2.21m | 5:24PM2.45m | 5:53AM2.10m | 6:09PM2.26m | 6:38AM1.97m | 6:56PM2.06m | 7:29AM1.85m | 7:50PM1.86m | 8:28AM1.75m | 8:56PM1.71m | 9:38AM1.71m | 10:14PM1.64m | 10:51AM1.74m | 11:27PM1.67m | |||||||
Low Tide | 11:02AM0.27m | 11:42PM0.23m | 11:46AM0.40m | 00:25AM0.40m | 12:34PM0.55m | 1:11AM0.57m | 1:28PM0.70m | 2:03AM0.72m | 2:34PM0.81m | 3:08AM0.81m | 3:56PM0.85m | 4:23AM0.84m | 5:13PM0.80m | ||||||||
 | |  | | |  |  | | | | | | | | | | | | | | | |
 | 7:05 | — | — | 7:07 | — | — | 7:07 | — | — | 7:07 | — | — | 7:07 | — | — | 7:09 | — | — | 7:09 | — | — |
 | — | 8:53 | — | — | 8:52 | — | — | 8:52 | — | — | 8:52 | — | — | 8:52 | — | — | 8:51 | — | — | 8:51 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 21 | 22 | 20 | 21 | 22 | 21 | 21 | 21 | 21 | 21 | 21 | 20 | 21 | 22 | 21 | 22 | 22 | 21 | 22 | 22 | 21 |
Feels °C | 19 | 20 | 17 | 18 | 19 | 18 | 17 | 17 | 18 | 18 | 17 | 17 | 18 | 19 | 19 | 20 | 20 | 19 | 19 | 19 | 18 |
Swell 1 Height (m) Direction Period (s) | WNW 8 | WNW 8 | WNW 8 | WNW 9 | WNW 9 | WNW 8 | WNW 8 | WNW 8 | WNW 7 | WNW 7 | NW 11 | NW 11 | NW 10 | NW 10 | NW 9 | NW 9 | NW 9 | WNW 9 | WNW 9 | WNW 8 | WNW 8 |
| kJ | 6 | 6 | 6 | 16 | 15 | 14 | 13 | 11 | 5 | 5 | 30 | 29 | 25 | 24 | 23 | 21 | 21 | 16 | 7 | 7 | 7 |
Swell 2 Height (m) Direction Period (s) | W 12 | W 11 | WNW 10 | — | — | N 11 | — | W 13 | NNW 9 | WNW 11 | W 9 | NW 8 | — | WNW 8 | — | W 9 | — | — | — | — | — |
| kJ | 3 | 2 | 10 | — | — | 2 | — | 3 | 8 | 13 | 2 | 3 | — | 6 | — | 2 | — | — | — | — | — |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | NW 12 | NNW 9 | — | — | — | — | — | — | — | — | — | — | — |
| kJ | — | — | — | — | — | — | — | — | 6 | 7 | — | — | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | NNE 7 | NNE 7 | NNE 7 | NNE 7 | NNE 7 | NNE 7 | NNE 8 | NNE 8 | NNE 7 | NNE 7 | NNE 7 | NNE 7 | NNE 7 | NNE 7 | NNE 7 | NNE 7 | NNE 8 | NNE 7 | NNE 7 | NNE 8 | NNE 7 |
| kJ | 302 | 286 | 290 | 418 | 423 | 482 | 606 | 501 | 475 | 417 | 376 | 345 | 403 | 365 | 392 | 405 | 416 | 394 | 365 | 416 | 405 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 256 | 231 | 256 | 256 | 330 | 330 | 256 | 330 | 256 | 330 | 331 | 330 | 330 | 330 | 330 | 330 | 330 | 259 | 331 | 534 | 259 |
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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