Surf Forecasts:
San Juan surf forecast from 23 Aug 2026:
- Most powerful swell: Saturday 29 Aug, 8PM (local time) - 1.5ft (0.5m), 11s period, W swell with 57 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 0.5m 11s and forecast to arrive on Saturday (Aug 29) at 8PM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 3.0m 10s period and expected on Saturday (Aug 29) at 2PM.
| Wave Type | Time (PST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 8PM (Sat 29th Aug) | 1.5ft (0.5m) 11s |
Table - best surf conditions forecast for San Juan over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let’s get straight into it. Looking at the next 16 days for San Juan, I gotta be honest – it’s a tough stretch. The first few days are basically a write-off, with barely a ripple and stormy skies. The surf window is mostly closed until we hit the first few days of September. From now until the end of August, you’re looking at a long, flat gap with no real swell to speak of and persistent risk of thunderstorms. The action doesn’t even start to whisper until the 2nd of September.
The only real blip of interest comes on Wednesday the 2nd of September. The morning shows a small swell of 3 feet from the WNW, with a period of 9 seconds. The combined energy climbs to a moderate 147, which is at least something to work with. By the afternoon, the wind swings to a light offshore from the S, making for clean conditions. The waves are surfable, but I wouldn’t call it a standout – it’s just the best of a quiet bunch. The swell direction from the WNW is a bit off the optimum N direction for this spot, so it won’t be firing perfectly, but it’s ridable for the keen.
The rest of the window into early September is tiny, with knee-high slop and poor surf conditions. Even the period around the 4th and 5th shows some small 2 to 2 foot swells, but the combined energy is weak – in the 25 to 75 range – and the wind isn’t helping much. It’s clean, but the waves just aren’t there.
For a beginner-friendly reef break that’s inconsistent, this is a pretty typical quiet spell. If you’re desperate, the 2nd of September afternoon is your best bet, but keep your expectations low. The water is sitting at 84° which is bang on average for this time of year, so at least the temperature is comfortable while you’re waiting for a wave.
Rusty.
Short Range ForecastHeavy rain (total 71mm), 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 499mm), heaviest during Sat morning. Warm (max 27°C on Thu morning, min 25°C on Thu night). Winds increasing (light winds from the SSW on Thu night, fresh winds from the SW by Fri night). | ||||||||||||||||||||
Monday 24 | Tuesday 25 | Wednesday 26 | Thursday 27 | Friday 28 | Saturday 29 | Sunday 30 | |||||||||||||||
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) | W 8 | WSW 9 | WSW 9 | WSW 9 | WSW 9 | W 9 | WNW 6 | WSW 9 | W 9 | WNW 6 | WNW 6 | WNW 6 | W 10 | N 12 | NNE 12 | N 12 | N 12 | W 10 | WNW 10 | N 8 | WNW 10 |
Wave Graph  | |||||||||||||||||||||
 kJ | 6 | 0 | 0 | 0 | 0 | 14 | 3 | 0 | 7 | 3 | 3 | 6 | 16 | 3 | 15 | 11 | 3 | 53 | 35 | 4 | 37 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | off | off | off | off | off | cross-off | cross-off | off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off |
High Tide | 6:29AM0.95m | 7:15AM0.96m | 7:56AM0.95m | 8:35AM0.92m | 9:14AM0.87m | 10:53PM0.40m | 9:54AM0.78m | 10:54PM0.49m | |||||||||||||
Low Tide | 4:20PM0.15m | 4:51PM0.15m | 5:16PM0.17m | 5:31PM0.20m | 5:38PM0.24m | 5:37PM0.30m | 1:50AM0.38m | 5:30PM0.35m | 3:44AM0.39m | ||||||||||||
 | |  | | | | | | |  | | | | | | | | | | | | |
 | 5:43 | — | — | 5:43 | — | — | 5:43 | — | — | 5:43 | — | — | 5:43 | — | — | 5:43 | — | — | 5:43 | — | — |
 | — | 6:17 | — | — | 6:16 | — | — | 6:15 | — | — | 6:15 | — | — | 6:15 | — | — | 6:14 | — | — | 6:14 | — |
mm | 5 | 13 | 17 | 5 | 2 | 4 | 5 | 11 | 9 | 8 | 15 | 38 | 19 | 58 | 114 | 70 | 41 | 136 | 51 | 47 | 81 |
Temp °C | 28 | 28 | 27 | 27 | 27 | 27 | 28 | 27 | 27 | 27 | 27 | 26 | 26 | 26 | 26 | 26 | 27 | 26 | 26 | 26 | 27 |
Feels °C | 30 | 30 | 30 | 29 | 29 | 30 | 31 | 29 | 30 | 30 | 30 | 30 | 28 | 29 | 26 | 26 | 28 | 26 | 27 | 26 | 27 |
Swell 1 Height (m) Direction Period (s) | WSW 9 | WSW 9 | WSW 9 | WSW 9 | WSW 9 | WSW 9 | WSW 9 | WSW 9 | WNW 6 | WSW 9 | WSW 9 | WSW 9 | N 13 | N 12 | NNE 12 | N 12 | N 12 | WSW 10 | N 8 | WSW 10 | N 7 |
| kJ | 264 | 320 | 275 | 343 | 360 | 249 | 213 | 249 | 7 | 292 | 254 | 360 | 3 | 3 | 15 | 11 | 3 | 1086 | 12 | 846 | 1 |
Swell 2 Height (m) Direction Period (s) | W 8 | — | — | — | — | W 9 | WNW 6 | — | W 9 | WNW 6 | WNW 6 | WNW 6 | W 10 | N 12 | N 12 | N 12 | N 10 | N 9 | WNW 10 | N 7 | WNW 10 |
| kJ | 6 | — | — | — | — | 14 | 3 | — | 6 | 3 | 3 | 6 | 16 | 3 | 3 | 11 | 2 | 41 | 35 | 4 | 37 |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | N 13 | — | S 5 | — | N 12 | W 10 | N 8 | N 8 | N 7 |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | 3 | — | 1 | — | 3 | 53 | 12 | 4 | 1 |
Wind waves Height (m) Direction Period (s) | S 3 | S 3 | S 3 | SSE 3 | SSE 3 | S 3 | S 3 | S 3 | WSW 9 | — | S 4 | SW 3 | WSW 9 | WSW 9 | WSW 9 | WSW 10 | WSW 10 | SW 4 | WSW 10 | SW 4 | WSW 10 |
| kJ | 6 | 1 | 5 | 4 | 1 | 5 | 3 | 5 | 339 | — | 9 | 2 | 480 | 606 | 1102 | 1391 | 1352 | 11 | 1184 | 16 | 788 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 158 | 158 | 81 | 158 | 158 | 158 | 158 | 166 | 166 | 158 | 158 | 166 | 732 | 787 | 732 | 787 | 793 | 610 | 610 | 793 | 793 |
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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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