
Surf Forecasts:
Siriu surf forecast from 6 Sep 2026:
- Best quality surf: Sunday 6 Sep, 9PM (local time) - 10ft (3.0m), 10s period, S swell with cross-offshore winds.
- Most powerful swell: Sunday 6 Sep, 9PM (local time) - 10ft (3.0m), 10s period, S swell with 1,509 kJ wave energy.
- Next surfable swell (1★+): Sunday 6 Sep, 9PM (local time) - 10ft (3.0m), 10s period with S 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 (Sep 06) at 9PM. The primary swell is predicted to be 3.0m and 10s period with a secondary swell of 2.3m and 10s. Another secondary swell of 0.2m and 8s 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 3.0m 10s and forecast to arrive on Sunday (Sep 06) at 9PM. 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 4s period and expected on Saturday (Sep 12) at 3AM.
| Wave Type | Time (-03) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 9PM (Sun 6th Sep) | 10ft (3.0m) 10s |
| Best Surf | 9PM (Sun 6th Sep) | 10ft (3.0m) 10s |
| Most Powerful | 9PM (Sun 6th Sep) | 10ft (3.0m) 10s |
Table - best surf conditions forecast for Siriu over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let’s get into what’s on the menu for the next couple of weeks.
Alright, we’ve got a bit of a slow start but the long-range is looking mighty interesting. The first few days have some swell, but the winds are a bit of a headache. The real standout window is further out, so don’t write this one off just yet.
We start Sunday the 6th with a solid 8ft southerly swell rolling in at Siriu. The energy is pumping (1207), but that 30 km/h cross-off wind is a bit of a handful, leaving it marginal. It’s a beginner spot, but it’s a bit on the big side for the less experienced. The water temp is about 65°, which is pretty normal for this time of year – nothing unusual there.
Monday the 7th morning is where it starts to clean up. The swell drops to 5ft from the south, but the wind slackens to a light cross-off, making for some very clean conditions. The energy is still moderate (504). This is a solid session.
The next few days, from Tuesday the 8th through Saturday the 12th, are a mixed bag of onshore winds and smaller, shorter-period swells. There are windows of glassy conditions, like Wednesday the 9th morning with a 5ft ENE swell and glassy wind, giving a clean look. But the periods are short (8 seconds), so it’s a bit of a mushy wave. The energy is moderate (586). Thursday the 10th afternoon is a real treat though – a 3ft SSE swell with a 15-second period, glassy wind, and moderate energy (587). That’s a long-period groundswell making for some lined-up, clean waves. That’s a beauty.
Now, pay attention to Sunday the 13th morning. We get a jump in swell to 7ft from the SSE with a 10-second period and a clean cross-off wind. The energy is strong (942). That’s a powerful, clean setup. It’s a bit big for beginners, but for the rest of us, that’s the pick of the first week.
The middle of the week after that, Monday the 14th and Tuesday the 15th, gets messy with onshore winds and choppy conditions. Not worth paddling out for.
But hold on – the real highlight is Sunday the 20th afternoon. Look at this: an 8ft ENE swell, glassy wind, and the energy is off the charts at 2010. That’s a serious, powerful swell with perfect conditions. This is for experienced surfers only; it’s too big for the average punter. The period is 8 seconds, so it’s a wind swell, but with that much energy and glass, it’s going to be a freight train at Siriu. That is the standout of the entire 16 days.
Overall, the best surf is on Sunday the 13th morning for a clean, powerful SSE swell, and the absolute winner is Sunday the 20th afternoon – a massive, glassy ENE swell for the experts. Keep your eye on that one.
Rusty.
Short Range ForecastMostly dry. Warm (max 21°C on Tue afternoon, min 8°C on Sun night). Winds decreasing (fresh winds from the SSW on Sun afternoon, calm by Wed morning). | Days 5-7 Weather SummaryModerate rain (total 15mm), heaviest on Fri night. Warm (max 22°C on Sat morning, min 17°C on Wed night). Wind will be generally light. | |||||||||||||||||||
Sun 6 | Monday 7 | Tuesday 8 | Wednesday 9 | Thursday 10 | Friday 11 | Saturday 12 | ||||||||||||||
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) | S 10 | S 10 | S 10 | SSE 10 | SSE 10 | SSE 10 | SSE 9 | ENE 7 | ENE 8 | ENE 8 | ENE 8 | SSE 12 | SSE 15 | SSE 13 | E 8 | E 8 | ENE 8 | ENE 7 | ENE 8 | S 10 |
Wave Graph | ||||||||||||||||||||
1194 | 1155 | 499 | 454 | 425 | 258 | 156 | 156 | 259 | 326 | 151 | 195 | 462 | 229 | 124 | 165 | 171 | 134 | 91 | 1200 | |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross-off | cross-off | on | cross-off | cross | cross-on | cross-off | glassy | cross-on | glassy | glassy | glassy | cross-off | cross | cross-on | cross-off | glassy | cross | cross-off |
High Tide | 00:24AM0.46m | 1:32PM0.82m | 00:17AM0.54m | 1:57PM0.80m | 00:22AM0.62m | 2:10PM0.77m | 00:43AM0.70m | 2:10PM0.72m | 1:11AM0.77m | 2:12PM0.69m | 1:42AM0.80m | 2:21PM0.67m | 2:14AM0.81m | |||||||
Low Tide | 6:52PM0.34m | 5:49AM0.06m | 7:07PM0.33m | 6:35AM-0.01m | 7:28PM0.33m | 7:16AM-0.05m | 7:51PM0.32m | 7:52AM-0.05m | 8:12PM0.30m | 8:25AM-0.01m | 8:30PM0.27m | 8:55AM0.05m | 8:43PM0.24m | |||||||
— | — | 6:22 | — | — | 6:20 | — | — | 6:18 | — | — | 6:18 | — | — | 6:16 | — | — | 6:16 | — | — | |
6:02 | — | — | 6:02 | — | — | 6:02 | — | — | 6:04 | — | — | 6:04 | — | — | 6:05 | — | — | 6:05 | — | |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | 6 | 4 | 2 | 3 | — | — | — |
Temp °C | 13 | 11 | 13 | 14 | 12 | 20 | 21 | 17 | 21 | 20 | 18 | 21 | 21 | 19 | 21 | 20 | 20 | 22 | 22 | 15 |
Feels °C | 5 | 5 | 10 | 11 | 9 | 16 | 17 | 16 | 21 | 20 | 19 | 23 | 23 | 22 | 22 | 19 | 19 | 25 | 19 | 9 |
Swell 1 Height (m) Direction Period (s) | ENE 8 | S 10 | S 10 | SSE 10 | SSE 10 | SSE 10 | SSE 9 | ENE 7 | ENE 8 | ENE 8 | ENE 8 | E 8 | E 8 | E 8 | E 8 | E 8 | ENE 8 | ENE 7 | ENE 8 | S 10 |
13 | 755 | 499 | 454 | 425 | 258 | 156 | 154 | 259 | 237 | 151 | 118 | 121 | 120 | 124 | 165 | 171 | 134 | 91 | 851 | |
Swell 2 Height (m) Direction Period (s) | — | E 8 | E 8 | E 8 | E 8 | E 6 | SE 12 | SSE 9 | SSE 10 | SSE 12 | S 10 | SSE 12 | SSE 15 | SSE 13 | S 12 | S 12 | SSE 11 | S 10 | S 10 | ENE 8 |
— | 5 | 5 | 5 | 5 | 41 | 37 | 153 | 214 | 288 | 138 | 195 | 462 | 229 | 104 | 96 | 39 | 31 | 18 | 50 | |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | ENE 8 | SSE 12 | S 16 | SSE 15 | S 12 | E 14 | SSE 12 | SSE 16 | E 14 | E 14 | ESE 13 | ESE 13 | E 12 | SSE 6 | ESE 12 | E 12 |
— | — | — | — | 12 | 57 | 5 | 21 | 113 | 4 | 89 | 166 | 4 | 4 | 17 | 17 | 12 | 4 | 14 | 3 | |
Wind waves Height (m) Direction Period (s) | S 10 | S 10 | — | — | — | — | E 6 | NE 7 | — | ENE 8 | — | — | — | — | — | NNE 3 | N 4 | S 6 | S 5 | S 10 |
1194 | 1155 | — | — | — | — | 43 | 156 | — | 326 | — | — | — | — | — | 3 | 9 | 7 | 54 | 1200 | |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 1201 | 0 | 0 | 27 | 0 | 6 | 27 | 0 | 0 | 16 | 0 | 0 | 0 | 0 | 6 | 16 | 9 | 0 | 15 | 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.










