Surf Forecasts:
Siriu surf forecast from 24 Aug 2026:
- Best quality surf: Monday 24 Aug, 9AM (local time) - 8ft (2.5m), 14s period, SSE swell with glassy winds.
- Most powerful swell: Monday 24 Aug, 9AM (local time) - 8ft (2.5m), 14s period, SSE swell with 2,541 kJ wave energy.
- Next surfable swell (1★+): Monday 24 Aug, 9AM (local time) - 8ft (2.5m), 14s 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 Monday (Aug 24) at 9AM. The primary swell is predicted to be 2.5m and 14s period with a secondary swell of 0.1m and 7s. The wind is predicted to be glassy as the swell arrives.
The most powerful waves expected at Siriu in the next 16 days are 2.5m 14s and forecast to arrive on Monday (Aug 24) at 9AM. Winds are predicted to be glassy at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.4m 3s period and expected on Saturday (Aug 29) at 9AM.
| Wave Type | Time (-03) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 9AM (Mon 24th Aug) | 8ft (2.5m) 14s |
| Best Surf | 9AM (Mon 24th Aug) | 8ft (2.5m) 14s |
| Most Powerful | 9AM (Mon 24th Aug) | 8ft (2.5m) 14s |
Table - best surf conditions forecast for Siriu over the next 16 days.
The Lowdown
Alright, let’s get into it. The next couple of weeks have some serious potential, but we gotta pick our moments. We start with a bang, then it goes quiet, and then we finish with another solid pulse that’s worth keeping an eye on.
The standout is the first push of swell, hitting Monday, August 24th. We’re looking at a solid 8ft of SSE groundswell with a 14-second period, and the energy is strong at 2543. Morning is the call here. It’s glassy with a light offshore touch, which will keep things clean. This is a proper size for experienced surfers – a bit much for the beginners, that’s for sure. Siriu is exposed to this SSE swell, so it’s going to be handling it all. That’s your pick of the week, no doubt.
After that, the swell backs off a little but stays rideable through Tuesday and Wednesday. Tuesday morning sees 6ft of SSE swell with a 13-second period, but the cross-shore wind will make it a bit lumpy. Not terrible, but not a patch on Monday. Wednesday morning has a similar story with 7ft, but again, the cross-shore wind is there to mess with the face. The energy is still moderately strong (1759), but it’s not as clean as it could be.
From Thursday, things start to fade. The swell drops to 5ft, and the winds get messier. By Friday, we’ve got a poor-quality, short-period ENE swell with a fresh cross-shore wind. That’s a write-off. Kite surfing might be more fun than paddling out on Friday afternoon.
This leads into a quiet patch over the weekend and into the start of the following week. From Saturday, August 29th through to around Thursday, September 4th, it’s all small and weak. There’s some glassy, small waves on Saturday morning and Sunday morning, but they’re not really going to light your fire – energy values are in the 300-500 range, which is weak. The period is down in the 8-10 second zone, so the juice isn’t really there. It’s that classic summertime lull. A blank run, but it doesn’t tend to last forever around here.
The second half of the second week is still pretty quiet until we get to Monday, September 8th. This is our second standout. After a week of small stuff, we see a new pulse of groundswell late in the forecast period. This is promising, but being that far out, treat it as a “promising” rather than a sure thing. The models are showing 6ft of SE swell with a 14-second period, and that energy value jumps back up into the strong range at 1423. Tuesday, September 9th, looks even more interesting with a 7ft SSE swell and a very long 15-second period, but it’s not until the following day. Just remember, a long period swell like that can be a bit straight at beach breaks, but for a reef or a point, it’ll be firing. The morning of the 8th looks glassy, which would be prime.
So, the bottom line: get on it Monday morning, be ready for a flat spell, and keep an eye on that early September pulse.
Rusty.
Short Range ForecastLight rain (total 7mm), mostly falling on Wed night. Warm (max 20°C on Wed morning, min 12°C on Mon morning). Wind will be generally light. | Days 4-6 Weather SummaryModerate rain (total 11mm), heaviest on Fri night. Warm (max 23°C on Fri morning, min 18°C on Thu night). Wind will be generally light. | ||||||||||||||||||||
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) | SSE 14 | SSE 14 | SSE 13 | SSE 13 | SSE 12 | SSE 12 | SSE 14 | SE 14 | SSE 14 | SSE 13 | SSE 13 | SSE 12 | ENE 8 | ENE 8 | ENE 9 | E 9 | E 9 | E 9 | E 10 | ENE 10 | E 10 |
Wave Graph | |||||||||||||||||||||
2541 | 2285 | 1319 | 977 | 807 | 569 | 1748 | 1929 | 1447 | 808 | 520 | 251 | 330 | 361 | 363 | 356 | 304 | 332 | 479 | 363 | 414 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | glassy | cross-on | glassy | cross | cross-on | cross | cross | cross | cross | cross | cross-on | cross | cross | cross-on | cross-off | glassy | glassy | cross-off | cross-off | cross | cross-off |
High Tide | 1:15PM0.72m | 00:17AM0.60m | 1:34PM0.75m | 00:41AM0.67m | 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 | ||||||||
Low Tide | 7:01PM0.31m | 6:46AM0.04m | 7:25PM0.28m | 7:21AM-0.01m | 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 | ||||||||
6:37 | — | — | 6:35 | — | — | 6:35 | — | — | 6:33 | — | — | 6:33 | — | — | 6:31 | — | — | 6:31 | — | — | |
— | 5:55 | — | — | 5:57 | — | — | 5:57 | — | — | 5:58 | — | — | 5:58 | — | — | 5:59 | — | — | 5:59 | — | |
mm | — | — | — | — | — | — | — | 1 | 6 | — | — | — | 1 | 1 | 4 | — | 2 | 3 | 4 | 3 | 9 |
Temp °C | 14 | 14 | 13 | 17 | 18 | 15 | 20 | 19 | 18 | 20 | 19 | 19 | 23 | 21 | 19 | 22 | 23 | 19 | 19 | 20 | 21 |
Feels °C | 12 | 11 | 12 | 14 | 14 | 12 | 18 | 17 | 17 | 20 | 19 | 18 | 22 | 21 | 19 | 25 | 26 | 19 | 20 | 21 | 22 |
Swell 1 Height (m) Direction Period (s) | SSE 14 | SSE 14 | SSE 13 | SSE 13 | SSE 12 | SSE 12 | SSE 14 | SE 14 | SSE 14 | SSE 13 | SSE 13 | SSE 12 | SSE 11 | SE 11 | ENE 9 | E 9 | E 9 | E 9 | E 10 | ENE 10 | E 10 |
2541 | 2285 | 1319 | 977 | 807 | 569 | 1748 | 1929 | 1447 | 808 | 520 | 251 | 111 | 58 | 363 | 356 | 304 | 332 | 479 | 363 | 414 | |
Swell 2 Height (m) Direction Period (s) | NE 7 | — | — | NE 7 | — | SE 16 | — | — | — | — | — | — | — | — | SE 10 | SE 10 | SSE 10 | SSE 10 | S 6 | S 7 | S 6 |
2 | — | — | 2 | — | 502 | — | — | — | — | — | — | — | — | 27 | 25 | 10 | 9 | 3 | 14 | 21 | |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | SSE 9 | SE 9 | SE 10 |
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 8 | 3 | 4 | |
Wind waves Height (m) Direction Period (s) | — | — | — | — | NE 3 | NNE 3 | NNE 4 | NE 4 | NE 5 | ENE 6 | NE 6 | ENE 7 | ENE 8 | ENE 8 | — | SSW 3 | — | — | — | — | — |
— | — | — | — | 11 | 5 | 11 | 15 | 43 | 69 | 136 | 237 | 330 | 361 | — | 3 | — | — | — | — | — | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 0 | 13 | 0 | 9 | 27 | 9 | 9 | 27 | 9 | 9 | 9 | 27 | 27 | 16 | 0 | 0 | 0 | 0 | 0 | 6 | 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.











