Surf Forecasts:
Siriu surf forecast from 4 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 1,609 kJ wave energy.
- Next surfable swell (1★+): Friday 4 Sep, 9PM (local time) - 2.5ft (0.8m), 8s 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 Friday (Sep 04) at 9PM. The primary swell is predicted to be 0.8m and 8s period with a secondary swell of 0.8m and 6s. 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 0.4m 9s period and expected on Tuesday (Sep 08) at 3PM.
| Wave Type | Time (-03) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 9PM (Fri 4th Sep) | 2.5ft (0.8m) 8s |
| 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 have a look at what’s comin’ our way for Siriu. It’s a bit of a slow burner this one, but there’s a proper little window of gold later on if you’re patient.
Right now, things are pretty flat and messy. We’ve got a weak swell showing on Friday the 4th, but it’s only 2ft from the SE with a cross-shore wind and poor conditions. Not worth paddling out for. The whole first week is a bit of a write-off, to be honest. The surf picks up a touch over the weekend, but the wind is too strong or the swell is too short-period to get excited about. There’s a bump on Sunday the 6th with 6ft to 8ft of S swell, but the wind is howling out of the SSW at 15-22 mph. That’s just messy and blown out.
The real story starts on Monday the 14th. That morning is a standout. We’ve got a solid 8ft groundswell rolling in from the SE, with a long 12-second period and glassy conditions. The wind is dead calm, just a light rain. The wave energy is strong (1768), and the setup is perfect for experienced surfers. This is the kind of morning you dream about – clean, powerful, and lined up. The swell is over 8ft though, so experts only. That afternoon the wind swings onshore, so don’t sleep in.
Tuesday the 15th morning is also a cracker. The swell drops to a more manageable 4ft from the SE, still with a nice 11-second period. It’s glassy again, with barely a breath of wind. The wave energy is moderate (547), and conditions are clean. This is the best bet for the average surfer. The water temp is sitting at 66°, which is pretty much normal for this time of year, so no shocks there.
The following week has a few more options, but nothing that beats that Monday-Tuesday window. Thursday the 17th has clean 3ft surf in the morning, and Friday the 18th has a longer period 3ft swell from the SSE, but the wind picks up. It’s all a bit inconsistent. The 16th looks glassy with 3ft from the ESE with a 12-second period, but the swell is small.
To wrap it up, the best surf on offer is Monday the 14th morning at Siriu for the big-swell chargers, and Tuesday the 15th morning for the rest of us. Don’t bother before that unless you like scratching around in junk.
Rusty.
Short Range ForecastModerate rain (total 12mm), heaviest on Fri night. Very mild (max 16°C on Fri afternoon, min 9°C on Sun night). Winds increasing (light winds from the SW on Sat morning, fresh winds from the SSW by Sun afternoon). | Days 5-7 Weather SummarySome drizzle, heaviest during Thu morning. Warm (max 23°C on Wed morning, min 12°C on Mon night). Wind will be generally light. | |||||||||||||||||||
Fri 4 | Saturday 5 | Sunday 6 | Monday 7 | Tuesday 8 | Wednesday 9 | Thursday 10 | ||||||||||||||
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) | SE 10 | ENE 8 | S 10 | S 9 | S 8 | S 8 | S 9 | S 9 | S 9 | SSE 9 | SSE 10 | ENE 7 | ENE 7 | NE 8 | ENE 8 | NE 8 | ENE 8 | S 12 | SSE 15 | SSE 14 |
Wave Graph  | ||||||||||||||||||||
 kJ | 64 | 96 | 148 | 230 | 405 | 328 | 971 | 1088 | 459 | 344 | 301 | 311 | 418 | 728 | 344 | 428 | 206 | 137 | 237 | 143 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-on | cross-off | cross | cross | cross | cross | cross | cross-off | cross-off | cross-on | on |
High Tide | 00:04AM0.36m | 12:25PM0.73m | 00:19AM0.41m | 1:01PM0.79m | 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 | |||||||
Low Tide | 9:10PM0.30m | 3:36AM0.25m | 9:01PM0.34m | 4:52AM0.16m | 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 | |||||||
 |  |  | |  |  |  | | | |  | | | | | | | | |  | |
 | — | — | 6:24 | — | — | 6:22 | — | — | 6:22 | — | — | 6:20 | — | — | 6:18 | — | — | 6:18 | — | — |
 | 6:01 | — | — | 6:01 | — | — | 6:02 | — | — | 6:02 | — | — | 6:02 | — | — | 6:04 | — | — | 6:04 | — |
mm | — | 6 | 4 | 2 | — | — | — | — | — | — | — | — | — | — | — | — | — | 1 | — | 5 |
Temp °C | 16 | 15 | 14 | 14 | 14 | 13 | 13 | 11 | 14 | 14 | 13 | 16 | 18 | 17 | 23 | 21 | 17 | 18 | 18 | 19 |
Feels °C | 13 | 14 | 13 | 12 | 10 | 7 | 5 | 5 | 11 | 12 | 11 | 14 | 16 | 16 | 23 | 21 | 15 | 19 | 18 | 19 |
Swell 1 Height (m) Direction Period (s) | ENE 8 | ENE 8 | ENE 8 | S 9 | S 8 | E 8 | ENE 8 | S 9 | S 9 | SSE 9 | SSE 10 | ENE 7 | SSE 9 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 |
| kJ | 55 | 96 | 125 | 159 | 201 | 31 | 13 | 642 | 459 | 344 | 301 | 206 | 124 | 453 | 344 | 306 | 206 | 127 | 96 | 75 |
Swell 2 Height (m) Direction Period (s) | SE 10 | S 6 | S 10 | ENE 8 | ENE 8 | E 9 | — | E 8 | E 8 | E 8 | E 6 | SSE 10 | SSW 9 | SSE 9 | SSE 11 | SSE 12 | SSE 10 | S 12 | SSE 15 | S 5 |
| kJ | 64 | 49 | 148 | 92 | 51 | 7 | — | 5 | 12 | 11 | 49 | 201 | 28 | 94 | 135 | 196 | 144 | 137 | 237 | 21 |
Swell 3 Height (m) Direction Period (s) | S 8 | SE 10 | SE 10 | SE 10 | SE 10 | — | — | — | NE 8 | — | ENE 8 | — | S 16 | SE 15 | SE 8 | — | — | SSE 16 | S 3 | SSE 14 |
| kJ | 1 | 63 | 37 | 38 | 16 | — | — | — | 2 | — | 11 | — | 5 | 9 | 18 | — | — | 53 | 1 | 143 |
Wind waves Height (m) Direction Period (s) | S 5 | — | — | S 9 | S 8 | S 8 | S 9 | S 9 | — | — | E 6 | ENE 7 | ENE 7 | NE 8 | — | NE 8 | — | SSW 3 | SW 3 | — |
| kJ | 43 | — | — | 230 | 405 | 328 | 971 | 1088 | — | — | 103 | 311 | 418 | 728 | — | 428 | — | 1 | 3 | — |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 38 | 0 | 0 | 0 | 13 | 13 | 1501 | 10 | 0 | 13 | 0 | 6 | 9 | 6 | 6 | 10 | 0 | 0 | 27 | 27 |
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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