Surf Forecasts:
San Juan surf forecast from 13 Sep 2026:
- Best quality surf: Sunday 20 Sep, 1AM (local time) - 4.5ft (1.4m), 9s period, N swell with glassy winds.
- Most powerful swell: Friday 18 Sep, 10AM (local time) - 6ft (1.9m), 10s period, N swell with 701 kJ wave energy.
- Next surfable swell (1★+): Monday 14 Sep, 4AM (local time) - 4ft (1.2m), 8s period with NNE swell.
Best Forecast Surf Conditions for San Juan this week:
The surf forecast for San Juan over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Monday (Sep 14) at 4AM. The primary swell is predicted to be 1.2m and 8s period with a secondary swell of 0.5m and 14s. The wind is predicted to be cross-offshore as the swell arrives.
The most powerful waves expected at San Juan in the next 16 days are 1.9m 10s and forecast to arrive on Friday (Sep 18) at 10AM. Winds are predicted to be cross-onshore at the time the swell arrives.
| Wave Type | Time (WEST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 4AM (Mon 14th Sep) | 4ft (1.2m) 8s |
| Best Surf | 1AM (Sun 20th Sep) | 4.5ft (1.4m) 9s |
| Most Powerful | 10AM (Fri 18th Sep) | 6ft (1.9m) 10s |
Table - best surf conditions forecast for San Juan over the next 16 days.
The Lowdown
Alright, Rusty here.
Let’s be straight—the outlook for San Juan over the next couple of weeks is frustrating. We’re staring down a barrel of wind that’s mostly onshore or cross-onshore from the north for the first week and a half, churning up whatever swell shows up. From now until about the 19th, you’re looking at poor, choppy conditions, and wave energy ranges from weak right up to strong (143 to 701). It’s just not worth getting wet. After that, things go quiet for a few days.
The light at the end of the tunnel comes in the final few days of the month.
On Sunday the 27th of September, the morning shapes up nice. Glassy conditions and a clean 0.8m (about 3ft) groundswell out of the NNW, running on a deep 16-second period. Combined energy is moderate (395), but that long period will wrap perfectly around the reef at San Juan (reef). The water temp is about average for the time of year—around 75°, nothing unusual there. This is the best bet for a smooth, clean session.
But the real standout is Monday the 28th of September. The morning shows a gentle offshore breeze with a solid 1.3m (roughly 4ft) swell from the NNW, pushed by a 14-second period. The energy jumps to a strong 717. Winds are clean offshore, so the reef should be holding some lined-up, powerful waves. This is strictly for the experts with that size and punch, but if you’ve got the skill, this is the session to circle.
Sunday the 27th morning: Glassy, clean 0.8m groundswell (NNW, 16s). Your sleeper pick.
Monday the 28th morning: 1.3m swell (NNW, 14s) with clean offshore wind. The big one.
There’s a solid ten-day gap of poor or marginal surf in between. The swell on the 28th packs the most energy (717) and is practically the only real quality window on offer. The rest is a write-off.
Rusty.
Short Range ForecastMostly dry. Warm (max 30°C on Mon night, min 22°C on Sun night). Wind will be generally light. | Days 4-6 Weather SummaryMostly dry. Warm (max 24°C on Wed morning, min 21°C on Wed night). Mainly fresh winds. | ||||||||||||||||||||
Sunday 13 | Monday 14 | Tuesday 15 | Wednesday 16 | Thursday 17 | Friday 18 | Saturday 19 | |||||||||||||||
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) | N 8 | NNE 8 | N 8 | NNW 12 | NNW 12 | NNW 12 | NNW 11 | NNE 7 | NE 7 | NNE 6 | NE 7 | NE 7 | NNE 8 | N 8 | N 9 | N 10 | N 10 | N 10 | N 10 | N 9 | N 9 |
Wave Graph  | |||||||||||||||||||||
 kJ | 228 | 280 | 191 | 136 | 127 | 119 | 91 | 62 | 50 | 88 | 178 | 303 | 507 | 539 | 562 | 625 | 557 | 544 | 455 | 436 | 320 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross | cross | on | on | on | cross-on | cross-on | on | on | on | on | on | cross-on | on | on | cross-on | on | on | cross-on | glassy |
High Tide | 3:41PM2.52m | 3:59AM2.36m | 4:15PM2.35m | 4:31AM2.24m | 4:49PM2.15m | 5:04AM2.08m | 5:24PM1.93m | 5:41AM1.91m | 6:06PM1.72m | 6:28AM1.74m | 7:06PM1.54m | 7:45AM1.61m | 8:54PM1.45m | ||||||||
Low Tide | 9:47PM0.10m | 9:59AM0.17m | 10:18PM0.24m | 10:34AM0.31m | 10:49PM0.42m | 11:09AM0.48m | 11:22PM0.60m | 11:50AM0.66m | 00:01AM0.78m | 12:45PM0.84m | 1:01AM0.94m | 2:21PM0.96m | 2:52AM1.02m | ||||||||
 | |  | | | | | | | | |  |  | | | | | | | | | |
 | 7:37 | — | — | 7:37 | — | — | 7:37 | — | — | 7:39 | — | — | 7:39 | — | — | 7:39 | — | — | 7:39 | — | — |
 | — | 8:01 | — | — | 8:00 | — | — | 8:00 | — | — | 7:58 | — | — | 7:57 | — | — | 7:55 | — | — | 7:54 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 24 | 24 | 28 | 26 | 27 | 30 | 30 | 27 | 27 | 24 | 23 | 21 | 22 | 22 | 21 | 23 | 23 | 22 | 23 | 23 | 23 |
Feels °C | 26 | 28 | 28 | 28 | 28 | 28 | 29 | 25 | 26 | 24 | 22 | 19 | 19 | 18 | 16 | 20 | 20 | 20 | 22 | 23 | 24 |
Swell 1 Height (m) Direction Period (s) | N 8 | NNE 8 | N 8 | NNE 8 | NNW 12 | NNW 12 | NNW 11 | NNW 10 | NE 7 | NNW 9 | NW 11 | NW 10 | NW 10 | NW 12 | NW 12 | N 10 | N 10 | N 10 | N 10 | N 9 | N 9 |
| kJ | 228 | 280 | 191 | 127 | 127 | 119 | 91 | 60 | 50 | 16 | 29 | 50 | 48 | 39 | 137 | 625 | 557 | 544 | 455 | 436 | 320 |
Swell 2 Height (m) Direction Period (s) | NE 8 | NW 9 | NNW 14 | NNW 12 | NE 8 | N 8 | NE 8 | WNW 8 | NNW 10 | NW 11 | NNW 9 | NNW 8 | NW 12 | NW 10 | — | NNW 11 | NNW 10 | NNW 10 | NNW 18 | NNW 17 | NNW 16 |
| kJ | 132 | 20 | 81 | 136 | 48 | 41 | 31 | 14 | 38 | 19 | 16 | 12 | 39 | 24 | — | 76 | 67 | 39 | 106 | 216 | 256 |
Swell 3 Height (m) Direction Period (s) | NNE 8 | NNW 15 | NW 10 | NW 9 | NW 9 | NE 8 | N 7 | NW 13 | N 7 | WNW 8 | WNW 8 | — | — | — | — | — | — | N 16 | NW 13 | — | — |
| kJ | 19 | 45 | 25 | 21 | 20 | 49 | 23 | 7 | 16 | 6 | 6 | — | — | — | — | — | — | 5 | 7 | — | — |
Wind waves Height (m) Direction Period (s) | — | — | — | — | N 7 | — | — | NNE 7 | — | NNE 6 | NE 7 | NE 7 | NNE 8 | N 8 | N 9 | — | — | — | — | — | — |
| kJ | — | — | — | — | 54 | — | — | 62 | — | 88 | 178 | 303 | 507 | 539 | 562 | — | — | — | — | — | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 38 | 1 | 9 | 9 | 10 | 9 | 10 | 314 | 33 | 256 | 38 | 256 | 256 | 231 | 256 | 231 | 231 | 38 | 231 | 231 | 0 |
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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