Surf Forecasts:
Siriu surf forecast from 1 Sep 2026:
- Best quality surf: Sunday 6 Sep, 9PM (local time) - 10ft (3.0m), 9s period, S swell with cross-offshore winds.
- Most powerful swell: Monday 7 Sep, 12AM (local time) - 10ft (3.0m), 10s period, S swell with 1,448 kJ wave energy.
- Next surfable swell (1★+): Wednesday 2 Sep, 12AM (local time) - 7ft (2.1m), 9s period with SSE 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 Wednesday (Sep 02) at 12AM. The primary swell is predicted to be 2.1m and 9s period with a secondary swell of 0.4m and 8s. 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 3.0m 10s and forecast to arrive on Monday (Sep 07) at 12AM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.7m 5s period and expected on Wednesday (Sep 02) at 3PM.
| Wave Type | Time (-03) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 12AM (Wed 2nd Sep) | 7ft (2.1m) 9s |
| Best Surf | 9PM (Sun 6th Sep) | 10ft (3.0m) 9s |
| Most Powerful | 12AM (Mon 7th Sep) | 10ft (3.0m) 10s |
Table - best surf conditions forecast for Siriu over the next 16 days.
The Lowdown
G’day, I’m Rusty. Let’s look at what’s turning on around Siriu for the next couple of weeks.
The first few days are nothing to write home about, but it gets interesting by Wednesday the 2nd. That morning, Siriu gets a solid 7ft swell from the SE, with a 10-second period, and a firm cross-offshore wind. The wave energy is moderate (921), and it’s setting up for very good surf. Clean lines and solid push – that’s the one to aim for in the first week.
The water temp is 66°, which is pretty normal for this time of year.
Saturday the 5th is worth a look too – a smaller 4ft from the S, 8-second period, with a light cross-offshore breeze. Energy is moderate (472), and the conditions are clean. Good fun for a beginner-friendly spot.
Come Monday the 7th, we get a jump in size – 8ft from the S, 9-second period, and a clean cross-offshore wind. Energy is strong (1534), but that’s solidly in expert territory. For most folks, it’ll be a bit much.
Wednesday the 9th morning has a glassy calm – 6ft from the ENE, but only a 6-second period. Energy is moderate (513). The flat wind makes it look tidy, but the short period might make it a bit jumbled. Still, a nice window for a relaxed session.
Saturday the 12th afternoon glass-off is a gem – 5ft from the E, 10-second period, glassy conditions. Energy is moderate (452). Clean, easy paddling, and a good chance for some fun waves.
The real standout in the second week is Monday the 14th morning. It’s a clean 3ft groundswell from the S, but with a very long period of 13 seconds – that’s proper energy (751). Cross-offshore wind, clean conditions. A long period swell like this will line up beautifully, best on a point or reef, but here at Siriu it’ll still offer super clean, silky waves. A treat for the patient surfer.
Tuesday the 15th morning brings 6ft from the E, 8-second period, clean with a cross-offshore breeze. Moderate energy (637). Good for an early session.
The last day, Wednesday the 16th morning, offers a 4ft swell from the SSE, again with that long 13-second period. Cross-offshore wind keeps it clean, energy moderate to strong (872). Another clean shot, but the size is smaller.
With Siriu being fairly consistent, there’s plenty to get excited about. The best windows are Wednesday 2nd morning, Monday 7th morning, Thursday 12th afternoon, Monday 14th morning, and Tuesday 15th morning. The standout moment is Wednesday 2nd morning at Siriu – 7ft SE swell, clean, with moderate energy. That’s the one to mark up.
Stay stoked.
Rusty
Short Range ForecastMostly dry. Warm (max 23°C on Thu morning, min 14°C on Tue night). Winds decreasing (fresh winds from the SSW on Tue afternoon, calm by Wed afternoon). | Days 5-7 Weather SummaryLight rain (total 4mm), mostly falling on Fri night. Very mild (max 17°C on Fri afternoon, min 9°C on Mon morning). Wind will be generally light. | |||||||||||||||||||
Tue 1 | Wednesday 2 | Thursday 3 | Friday 4 | Saturday 5 | Sunday 6 | Monday 7 | ||||||||||||||
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 8 | SSE 9 | SE 10 | SE 11 | SE 11 | SE 11 | SE 11 | SE 11 | SE 10 | ENE 8 | ENE 8 | S 8 | S 8 | S 8 | S 8 | S 8 | S 10 | S 9 | S 10 | SSE 12 |
Wave Graph  | ||||||||||||||||||||
 kJ | 306 | 691 | 850 | 928 | 729 | 462 | 332 | 187 | 106 | 85 | 122 | 187 | 133 | 173 | 129 | 447 | 1448 | 982 | 522 | 603 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross-off | cross-off | cross-on | cross | cross | cross-on | cross-off | cross-off | cross | cross-off | cross-off | cross-off | cross-off | cross-off | cross | cross-off | cross-off | cross | cross-off |
High Tide | 4:01PM0.59m | 4:28AM0.68m | 4:25PM0.53m | 5:22AM0.59m | 4:44PM0.46m | 11:45PM0.33m | 11:44AM0.63m | 00:04AM0.36m | 12:25PM0.73m | 00:19AM0.41m | 1:01PM0.79m | 00:24AM0.46m | 1:32PM0.82m | 00:17AM0.54m | ||||||
Low Tide | 10:22PM0.27m | 12:29PM0.35m | 9:01PM0.27m | 8:41AM0.49m | 2:23PM0.43m | 9:02PM0.28m | 9:10PM0.30m | 3:36AM0.25m | 9:01PM0.34m | 4:52AM0.16m | 6:52PM0.34m | 5:49AM0.06m | 7:07PM0.33m | |||||||
 |  | | | | | | |  | |  |  |  | | | |  | | | | |
 | — | — | 6:26 | — | — | 6:26 | — | — | 6:24 | — | — | 6:24 | — | — | 6:22 | — | — | 6:22 | — | — |
 | 6:00 | — | — | 6:00 | — | — | 6:00 | — | — | 6:01 | — | — | 6:01 | — | — | 6:02 | — | — | 6:02 | — |
mm | — | — | — | — | — | — | — | — | — | — | 2 | 1 | — | — | — | 1 | — | — | — | — |
Temp °C | 19 | 16 | 18 | 17 | 15 | 23 | 23 | 17 | 18 | 17 | 15 | 14 | 15 | 15 | 15 | 14 | 13 | 12 | 13 | 12 |
Feels °C | 15 | 13 | 15 | 15 | 13 | 19 | 20 | 15 | 15 | 14 | 13 | 11 | 12 | 12 | 9 | 9 | 9 | 5 | 6 | 8 |
Swell 1 Height (m) Direction Period (s) | ENE 8 | SSE 9 | SE 10 | SE 11 | SE 11 | SE 11 | SE 11 | SE 11 | SE 10 | ENE 8 | ENE 8 | S 8 | S 8 | S 8 | ENE 8 | ENE 8 | S 10 | S 9 | ENE 8 | S 10 |
| kJ | 22 | 691 | 850 | 928 | 729 | 462 | 332 | 187 | 106 | 73 | 122 | 125 | 133 | 95 | 50 | 21 | 993 | 539 | 13 | 496 |
Swell 2 Height (m) Direction Period (s) | ENE 8 | ENE 8 | ENE 10 | ENE 9 | ENE 9 | ENE 9 | ENE 9 | NE 5 | NE 6 | SE 10 | S 6 | ENE 8 | ENE 8 | ENE 8 | SE 10 | — | ENE 8 | ENE 8 | E 9 | ENE 8 |
| kJ | 42 | 21 | 71 | 92 | 64 | 42 | 42 | 42 | 28 | 85 | 58 | 125 | 94 | 72 | 15 | — | 13 | 13 | 6 | 13 |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | S 12 | S 11 | ENE 9 | E 8 | — | SE 10 | SE 10 | SE 10 | SE 10 | SSE 12 | — | — | — | — | E 9 |
| kJ | — | — | — | — | — | 3 | 2 | 42 | 35 | — | 65 | 35 | 36 | 16 | 15 | — | — | — | — | 6 |
Wind waves Height (m) Direction Period (s) | SSE 8 | — | — | SSW 5 | — | N 4 | NNE 5 | NNE 5 | SSW 4 | S 5 | — | S 8 | — | S 8 | S 8 | S 8 | S 10 | S 9 | S 10 | SSE 12 |
| kJ | 306 | — | — | 30 | — | 14 | 44 | 94 | 11 | 43 | — | 187 | — | 173 | 129 | 447 | 1448 | 982 | 522 | 603 |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 21 | 0 | 0 | 13 | 9 | 39 | 16 | 0 | 21 | 38 | 0 | 0 | 0 | 0 | 25 | 38 | 6 | 13 | 38 | 0 |
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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