Surf Forecasts:
San Juan surf forecast from 7 Sep 2026:
- Best quality surf: Sunday 13 Sep, 8AM (local time) - 5ft (1.5m), 10s period, N swell with offshore winds.
- Most powerful swell: Sunday 13 Sep, 8AM (local time) - 5ft (1.5m), 10s period, N swell with 449 kJ wave energy.
- Next surfable swell (1★+): Friday 11 Sep, 2AM (local time) - 3.5ft (1.0m), 7s period with N 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 Friday (Sep 11) at 2AM. The primary swell is predicted to be 1.0m and 7s period. The wind is predicted to be offshore as the swell arrives.
The most powerful waves expected at San Juan in the next 16 days are 1.5m 10s and forecast to arrive on Sunday (Sep 13) at 8AM. Winds are predicted to be offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.0m 4s period and expected on Sunday (Sep 13) at 2PM.
| Wave Type | Time (PST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 2AM (Fri 11th Sep) | 3.5ft (1.0m) 7s |
| Best Surf | 8AM (Sun 13th Sep) | 5ft (1.5m) 10s |
| Most Powerful | 8AM (Sun 13th Sep) | 5ft (1.5m) 10s |
Table - best surf conditions forecast for San Juan over the next 16 days.
The Lowdown
Alright folks, Rusty here with a look at what's shaping up for San Juan.
Straight up, it's been a quiet stretch and it's gonna stay that way for a while. We're looking at a long gap with barely a ripple through the first week or so, so don't bother waxing up just yet. The first sign of life doesn't show until Friday the 11th, but honestly, calling it "surfable" is being generous. We've got a weak little 4ft swell from the north with an 8-second period, which is just a short-period windswell, and the combined energy is a measly 146—barely moderate. The morning might offer a glassy moment, but the waves will be weak and unexciting. The water temp is sitting around 84°, pretty average for the time of year.
Things bump up slightly on Sunday the 13th with a 4ft north swell (energy up to 293), and we finally get some proper offshore wind from the SSE—that's a huge plus. It’ll be clean, but the swell is still just a little below average quality, so it's more of a "could be a fun session if you're desperate" kind of deal.
Now, for the standout and the one to actually get excited about: wait for it. We've got a proper pulse arriving on Wednesday the 16th but it's the Thursday the 17th that's the real winner. Thursday morning, San Juan will see a solid 10ft groundswell from the west, riding a 13-second period. That's long-period groundswell energy, and the combined energy is a whopping 2834—that's strong, powerful stuff. The wind flips to a glassy WNW, making for clean, lined-up waves. This is the true standout, but hear me now: this is a reef break and 10ft is serious, expert-only territory. Beginners should stay far, far away. The long period means it could be a bit better-formed at a point or reef, but with the right wind, this is going to be pumping.
After that, Friday the 18th still offers a decent 5ft WNW swell with clean glassy conditions in the morning, a good option if the earlier day is too big. Then it fades fast. So to sum it up, surf is nearly non-existent for the first five days, then mediocre, then one absolute cracker of a day if you've got the skills. The rest of the second week drops right back off. That's the story.
- Rusty
Short Range ForecastHeavy rain (total 67mm), heaviest during Mon afternoon. Warm (max 28°C on Mon morning, min 26°C on Mon night). Wind will be generally light. | Days 4-6 Weather SummaryHeavy rain (total 84mm), heaviest during Sat night. Warm (max 29°C on Fri morning, min 25°C on Thu night). Winds increasing (calm on Thu morning, fresh winds from the S by Sat night). | ||||||||||||||||||||
Monday 7 | Tuesday 8 | Wednesday 9 | Thursday 10 | Friday 11 | Saturday 12 | Sunday 13 | |||||||||||||||
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 11 | N 10 | N 7 | N 6 | N 6 | N 6 | N 6 | N 5 | N 5 | N 6 | N 6 | N 7 | N 8 | N 8 | N 8 | N 8 | N 9 | N 9 | N 9 | NNW 8 | N 8 |
Wave Graph  | |||||||||||||||||||||
 kJ | 11 | 8 | 8 | 3 | 3 | 3 | 2 | 2 | 4 | 18 | 20 | 108 | 146 | 140 | 235 | 140 | 180 | 181 | 293 | 113 | 57 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross-off | off | cross-off | cross-off | off | cross-off | glassy | off | glassy | on | off | glassy | cross-on | cross-off | cross | cross | cross-off | off | off | off |
High Tide | 5:45AM1.04m | 6:47AM1.01m | 7:43AM0.95m | 8:34AM0.85m | 10:18PM0.41m | 9:22AM0.74m | 10:09PM0.51m | 10:10AM0.62m | 10:23PM0.61m | ||||||||||||
Low Tide | 3:13PM0.01m | 3:55PM0.04m | 4:27PM0.11m | 4:47PM0.19m | 4:50PM0.28m | 1:41AM0.38m | 4:40PM0.36m | 3:34AM0.37m | 4:17PM0.41m | ||||||||||||
 | |  | | |  |  | | | | | |  | | |  | |  | | | | |
 | 5:45 | — | — | 5:46 | — | — | 5:46 | — | — | 5:46 | — | — | 5:46 | — | — | 5:46 | — | — | 5:46 | — | — |
 | — | 6:07 | — | — | 6:07 | — | — | 6:06 | — | — | 6:05 | — | — | 6:04 | — | — | 6:02 | — | — | 6:02 | — |
mm | 6 | 14 | 10 | 3 | 11 | 8 | 1 | 7 | 7 | 1 | 2 | 3 | — | 4 | 3 | 2 | 2 | 67 | 2 | 1 | 1 |
Temp °C | 28 | 28 | 27 | 28 | 28 | 27 | 28 | 28 | 27 | 27 | 28 | 27 | 29 | 29 | 27 | 27 | 28 | 27 | 27 | 29 | 27 |
Feels °C | 31 | 31 | 30 | 31 | 32 | 31 | 32 | 32 | 32 | 32 | 32 | 32 | 34 | 33 | 32 | 31 | 32 | 28 | 28 | 30 | 30 |
Swell 1 Height (m) Direction Period (s) | WSW 8 | WSW 8 | WSW 8 | WSW 8 | WSW 8 | WSW 8 | WSW 8 | WSW 7 | WSW 8 | N 6 | WSW 7 | N 7 | N 8 | N 8 | N 8 | N 8 | N 9 | N 9 | N 9 | NNW 8 | WSW 8 |
| kJ | 75 | 86 | 92 | 64 | 50 | 43 | 37 | 37 | 43 | 18 | 21 | 108 | 146 | 140 | 235 | 140 | 180 | 181 | 293 | 113 | 64 |
Swell 2 Height (m) Direction Period (s) | NNE 11 | N 7 | N 7 | N 6 | N 6 | N 6 | N 6 | N 5 | N 5 | WSW 8 | — | WSW 8 | SW 8 | SW 8 | SW 9 | SW 8 | SW 10 | SW 9 | SW 8 | SW 7 | N 8 |
| kJ | 11 | 4 | 8 | 3 | 3 | 3 | 2 | 2 | 4 | 22 | — | 46 | 28 | 14 | 27 | 23 | 54 | 30 | 11 | 75 | 57 |
Swell 3 Height (m) Direction Period (s) | N 8 | N 10 | N 9 | N 9 | N 9 | N 9 | N 9 | N 9 | N 9 | S 3 | — | — | — | — | S 3 | S 3 | SW 8 | — | — | N 11 | — |
| kJ | 1 | 8 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 1 | — | — | — | — | 2 | 1 | 2 | — | — | 2 | — |
Wind waves Height (m) Direction Period (s) | S 3 | SW 3 | SSE 3 | S 3 | — | — | SSE 3 | — | SE 2 | — | N 6 | SW 9 | — | — | SSE 3 | — | N 3 | S 3 | S 4 | SSE 4 | S 4 |
| kJ | 1 | 1 | 3 | 3 | — | — | 2 | — | 2 | — | 20 | 3 | — | — | 4 | — | 3 | 6 | 21 | 13 | 18 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 548 | 548 | 81 | 548 | 548 | 81 | 140 | 94 | 81 | 94 | 81 | 0 | 0 | 115 | 0 | 1 | 1 | 158 | 158 | 0 | 1 |
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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.
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