Surf Forecasts:
Siriu surf forecast from 26 Aug 2026:
- Best quality surf: Wednesday 2 Sep, 6AM (local time) - 4.5ft (1.4m), 9s period, S swell with cross-offshore winds.
- Most powerful swell: Wednesday 26 Aug, 12PM (local time) - 7ft (2.2m), 14s period, SSE swell with 1,987 kJ wave energy.
- Next surfable swell (1★+): Sunday 30 Aug, 12AM (local time) - 4.5ft (1.3m), 9s period with ENE swell.
Best Forecast Surf Conditions for Siriu this week:
The surf forecast for Siriu over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Sunday (Aug 30) at 12AM. The primary swell is predicted to be 1.3m and 9s period with a secondary swell of 0.2m and 10s. Another secondary swell of 0.5m and 4s is also forecast. The wind is predicted to be cross-offshore as the swell arrives.
The most powerful waves expected at Siriu in the next 16 days are 2.2m 14s and forecast to arrive on Wednesday (Aug 26) at 12PM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.0m 5s period and expected on Friday (Aug 28) at 9PM.
| Wave Type | Time (-03) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 12AM (Sun 30th Aug) | 4.5ft (1.3m) 9s |
| Best Surf | 6AM (Wed 2nd Sep) | 4.5ft (1.4m) 9s |
| Most Powerful | 12PM (Wed 26th Aug) | 7ft (2.2m) 14s |
Table - best surf conditions forecast for Siriu over the next 16 days.
The Lowdown
Alright, Rusty here. Let's take a look at what's on the cards for Siriu over the next couple of weeks.
The window opens up on Wednesday, the 26th of August, but to be honest, it’s not the cleanest start. We’ve got a solid 7ft swell from the SSE with a long 15-second period pushing in a lot of energy (1927), but the wind is a cross-shore from the north at 9 mph, putting a bit of a chop on the face. It’s rideable for sure, but it’s a bit scratchy for the quality you’d want on a day like that. The water is sitting at 65°F, which is pretty average for this time of year, no real surprises there.
The best session I can see in the first week is actually on Sunday, the 30th of August. The swell drops a little to 4ft from the ENE, but the wind goes completely glassy in the afternoon, with just a light breeze from the NE at 3 mph. That’s going to be clean as a whistle. The energy is modest (276), but with those conditions, it’ll be super fun on a longboard or a mid-length. That’s the standout for this first stretch.
There’s a real taste of winter coming early on in September. Tuesday the 1st of September morning has a clean 5ft swell from the ENE with a cross-off wind from the SSW at 12 mph, and the energy is picking up nicely (668). That’s looking very good. Then Wednesday the 2nd of September morning is also a gem: 5ft from the south, 10-second period, glassy conditions with the wind dropping to just 3 mph from the north. That’s a beautiful, clean surf day, and the energy is solid (663). Thursday the 3rd of September morning is another clean one with a 5ft south swell and light offshore winds. So that Tuesday through Thursday stretch is the real sweet spot for the whole outlook.
After that, the swell starts to ease into the second week, and there are a few more flat spells. There’s a noticeable gap in quality from the 5th of September onwards, with the swell dropping below 3ft and the wind turning onshore, making for poor conditions. But keep an eye on Monday the 7th of September morning. It’s a bit of a long shot, but the forecast shows 5ft from the ENE, with glassy conditions and a 7-second period. The energy is good (508), and if that glass holds, it could be a sneaky good session for those with a flexible schedule.
Overall, the best bets are the glassy Sunday the 30th of August, and that three-day window from Tuesday the 1st to Thursday the 3rd of September. The rest of the time, the wind and swell aren’t really playing ball for clean, classic surf.
Stay stoked.
Rusty.
Short Range ForecastMostly dry. Warm (max 27°C on Fri morning, min 17°C on Wed morning). Mainly fresh winds. | Days 4-6 Weather SummaryHeavy rain (total 41mm), heaviest during Mon morning. Warm (max 23°C on Sat morning, min 18°C on Mon night). Wind will be generally light. | ||||||||||||||||||||
Wednesday 26 | Thursday 27 | Friday 28 | Saturday 29 | Sunday 30 | Monday 31 | Tuesday 1 | |||||||||||||||
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) | SSE 15 | SSE 14 | SSE 14 | SSE 14 | SSE 13 | SSE 12 | NE 8 | NE 8 | NE 8 | ENE 8 | ENE 8 | ENE 9 | ENE 9 | ENE 9 | ENE 9 | ENE 9 | ENE 9 | ENE 9 | ENE 10 | S 8 | S 8 |
Wave Graph  | |||||||||||||||||||||
 kJ | 1927 | 1987 | 1604 | 943 | 649 | 255 | 456 | 371 | 532 | 299 | 300 | 276 | 227 | 243 | 348 | 300 | 254 | 193 | 271 | 527 | 675 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross-on | cross | cross | cross-on | cross | cross | cross | cross | cross-off | cross | cross-off | cross | glassy | cross-off | glassy | cross | cross-off | cross-off | cross | cross-off |
High Tide | 1:53PM0.77m | 1:06AM0.73m | 2:12PM0.77m | 1:33AM0.78m | 2:31PM0.76m | 2:02AM0.81m | 2:52PM0.74m | 2:33AM0.82m | 3:14PM0.70m | 3:07AM0.80m | 3:37PM0.65m | 3:45AM0.75m | 4:01PM0.59m | ||||||||
Low Tide | 7:51PM0.26m | 7:55AM-0.04m | 8:17PM0.25m | 8:29AM-0.04m | 8:45PM0.24m | 9:04AM-0.02m | 9:14PM0.24m | 9:40AM0.04m | 9:42PM0.24m | 10:20AM0.13m | 10:09PM0.25m | 11:11AM0.24m | 10:22PM0.27m | ||||||||
 | |  |  | |  | | | | | |  |  | | |  | |  | | | | |
 | 6:35 | — | — | 6:33 | — | — | 6:33 | — | — | 6:31 | — | — | 6:31 | — | — | 6:30 | — | — | 6:28 | — | — |
 | — | 5:57 | — | — | 5:58 | — | — | 5:58 | — | — | 5:59 | — | — | 5:59 | — | — | 6:00 | — | — | 6:00 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | 1 | 2 | — | 6 | 19 | 12 | 1 | — | — | — |
Temp °C | 21 | 22 | 18 | 23 | 23 | 19 | 27 | 27 | 23 | 23 | 22 | 19 | 19 | 20 | 20 | 20 | 20 | 19 | 20 | 18 | 15 |
Feels °C | 18 | 19 | 17 | 21 | 20 | 17 | 24 | 25 | 24 | 24 | 20 | 18 | 20 | 22 | 22 | 20 | 20 | 19 | 15 | 13 | 11 |
Swell 1 Height (m) Direction Period (s) | SSE 15 | SSE 14 | SSE 14 | SSE 14 | SSE 13 | SSE 12 | ENE 8 | SE 11 | ENE 8 | ENE 8 | ENE 8 | ENE 9 | ENE 9 | ENE 9 | ENE 9 | ENE 9 | ENE 9 | ENE 9 | ENE 10 | ENE 10 | S 8 |
| kJ | 1927 | 1987 | 1604 | 943 | 649 | 255 | 264 | 58 | 331 | 299 | 300 | 276 | 227 | 243 | 348 | 300 | 254 | 193 | 271 | 209 | 460 |
Swell 2 Height (m) Direction Period (s) | — | — | — | — | — | — | SSE 12 | — | SE 10 | SE 10 | SSE 10 | SSE 10 | S 6 | S 7 | SSE 7 | SSE 7 | SE 8 | SE 8 | SE 9 | SE 9 | ENE 10 |
| kJ | — | — | — | — | — | — | 121 | — | 28 | 25 | 10 | 10 | 7 | 57 | 108 | 134 | 143 | 135 | 176 | 83 | 180 |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | SSE 10 | SSE 9 | — | — | — | SE 10 | — | — | ESE 9 |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | 10 | 8 | — | — | — | 25 | — | — | 54 |
Wind waves Height (m) Direction Period (s) | — | NNE 3 | NE 5 | NE 6 | NE 6 | ENE 7 | NE 8 | NE 8 | NE 8 | SSW 3 | S 4 | S 4 | — | — | — | — | — | — | S 7 | S 8 | S 8 |
| kJ | — | 8 | 23 | 75 | 116 | 243 | 456 | 371 | 532 | 3 | 9 | 9 | — | — | — | — | — | — | 113 | 527 | 675 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 9 | 101 | 9 | 20 | 27 | 27 | 27 | 101 | 6 | 15 | 56 | 0 | 15 | 0 | 0 | 0 | 16 | 0 | 13 | 65 | 13 |
Best forecast wave conditions in Santa Catarina - Sul | |||||||||||||||||||||
Best forecast wave conditions in Brazil | |||||||||||||||||||||
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Information about the Siriu Surf forecast
The above surf forecast table for Siriu provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Siriu can be found by selecting the local surf guide option on the grey menu. Our Siriu 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 (Siriu) 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 Siriu 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.
Siriu is 27 km (17 miles) from Imbituba. If you plan a holiday in Santa Catarina - Sul, look for hotels and other accommodation in Imbituba. Imbituba has rooms for a wide range of budgets as well as car hire and transport links.
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