Surf Forecasts:
Siriu surf forecast from 25 Aug 2026:
- Best quality surf: Friday 28 Aug, 9PM (local time) - 5ft (1.6m), 8s period, ENE swell with glassy winds.
- Most powerful swell: Wednesday 26 Aug, 6PM (local time) - 7ft (2.1m), 15s period, SSE swell with 1,911 kJ wave energy.
- Next surfable swell (1★+): Friday 28 Aug, 9PM (local time) - 5ft (1.6m), 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 (Aug 28) at 9PM. The primary swell is predicted to be 1.6m and 8s period with a secondary swell of 0.4m and 11s. The wind is predicted to be glassy as the swell arrives.
The most powerful waves expected at Siriu in the next 16 days are 2.1m 15s and forecast to arrive on Wednesday (Aug 26) at 6PM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.5m 3s period and expected on Sunday (Aug 30) at 12AM.
| Wave Type | Time (-03) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 9PM (Fri 28th Aug) | 5ft (1.6m) 8s |
| Best Surf | 9PM (Fri 28th Aug) | 5ft (1.6m) 8s |
| Most Powerful | 6PM (Wed 26th Aug) | 7ft (2.1m) 15s |
Table - best surf conditions forecast for Siriu over the next 16 days.
The Lowdown
Alright, Rusty here. Let's get into it.
Alright, so for the next couple of weeks, it's going to be a bit of a mixed bag at Siriu. We've got some promising windows of clean surf, but we'll have to be patient and pick our moments, especially with the wind shifting around. The water temp is sitting at 66°, which is about average for this time of year, so nothing to worry about there.
Looking ahead to the start of the period, Tuesday morning the 25th of August is a real standout. We're looking at a solid 6ft groundswell from the SSE with a long period of 13 seconds, packing a moderate wave energy of 979. The key here is the glassy conditions with a northerly wind at just 3 mph. This is going to be the cleanest you'll see it, and for a beginner-friendly spot like Siriu, that's an absolute gift. Expect very good surf.
We do get a few other chances, but they come with more caveats. Sunday morning the 30th of August has a smaller 4ft ENE swell, but a light offshore wind from the west at 3 mph will keep it clean. It won't have the same punch as Tuesday, but it's a good pick for a smaller board and a long ride.
Moving into the first week of September, things get a bit more interesting but also messier. On Monday afternoon the 31st of August, we get a clean cross-offshore wind from the southwest at 9 mph with a small 4ft ENE swell. Good for a leisurely session. Then Thursday morning the 3rd of September, we're back to glassy conditions with a tiny 3ft SE swell. It's small, but glassy is glassy.
For the second week, keep an eye on Saturday the 5th of September. There's some decent size on the table with a 8ft SSE groundswell from a long period of 12 seconds. The combined energy is very strong at 1857. But the catch is a fresh cross-shore wind at 19 mph. That 8ft is expert territory and the bumpy conditions will make it a challenge, but the potential is there.
The very last standout is Monday afternoon the 7th of September. After a few days of average conditions, we get a glassy sky with a 6ft NE short-period swell at 7 seconds. The clean glass is the main event here.
Alright, overall, it's not an epic run, but there are definite bright spots. For a beginner-friendly spot that cleans up well, stay sharp for Tuesday the 25th of August. That's the one.
Rusty.
Short Range ForecastSome drizzle, heaviest during Wed afternoon. Warm (max 23°C on Thu morning, min 13°C on Tue morning). Winds increasing (light winds from the N on Tue morning, fresh winds from the NNE by Thu afternoon). | Days 4-6 Weather SummaryModerate rain (total 15mm), heaviest on Sun night. Warm (max 26°C on Fri morning, min 19°C on Sat night). Mainly fresh winds. | ||||||||||||||||||||
Tuesday 25 | Wednesday 26 | Thursday 27 | Friday 28 | Saturday 29 | Sunday 30 | Monday 31 | |||||||||||||||
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 13 | SSE 12 | SSE 12 | SSE 15 | SSE 14 | SSE 14 | SSE 14 | SSE 13 | NE 7 | ENE 8 | ENE 8 | ENE 8 | ENE 9 | ENE 9 | E 9 | ENE 9 | ENE 9 | ENE 9 | ENE 9 | ENE 9 | ENE 9 |
Wave Graph  | |||||||||||||||||||||
 kJ | 977 | 807 | 653 | 1860 | 1835 | 1468 | 845 | 572 | 327 | 253 | 356 | 354 | 349 | 374 | 388 | 283 | 248 | 307 | 326 | 276 | 166 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | glassy | cross-on | cross | cross | cross-on | cross | cross | cross-on | cross | cross | cross | cross | cross-off | cross-on | cross-off | off | cross-on | cross-off | cross | cross-off | cross-off |
High Tide | 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 | 3:07AM0.80m | 3:37PM0.65m | ||||||||
Low Tide | 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 | 10:20AM0.13m | 10:09PM0.25m | ||||||||
 |  |  | |  | | | |  | | | | | |  |  | | |  | | | |
 | 6:35 | — | — | 6:35 | — | — | 6:33 | — | — | 6:33 | — | — | 6:31 | — | — | 6:31 | — | — | 6:30 | — | — |
 | — | 5:57 | — | — | 5:57 | — | — | 5:58 | — | — | 5:58 | — | — | 5:59 | — | — | 5:59 | — | — | 6:00 | — |
mm | — | — | — | — | 1 | — | — | — | — | — | — | — | — | — | 2 | 4 | — | 9 | 8 | 6 | 1 |
Temp °C | 16 | 18 | 14 | 21 | 22 | 18 | 23 | 23 | 19 | 26 | 26 | 21 | 23 | 23 | 19 | 21 | 23 | 21 | 20 | 19 | 18 |
Feels °C | 13 | 15 | 12 | 18 | 19 | 16 | 20 | 19 | 16 | 23 | 26 | 23 | 23 | 25 | 19 | 23 | 23 | 22 | 22 | 19 | 16 |
Swell 1 Height (m) Direction Period (s) | SSE 13 | SSE 12 | SSE 12 | SSE 15 | SSE 14 | SSE 14 | SSE 14 | SSE 13 | ENE 7 | ENE 8 | SE 11 | ENE 8 | ENE 9 | ENE 9 | E 9 | ENE 9 | ENE 9 | ENE 9 | ENE 9 | ENE 9 | ENE 9 |
| kJ | 977 | 807 | 583 | 1860 | 1835 | 1468 | 845 | 572 | 180 | 253 | 58 | 354 | 349 | 374 | 388 | 283 | 248 | 307 | 326 | 276 | 166 |
Swell 2 Height (m) Direction Period (s) | NE 7 | — | SE 16 | — | — | — | NE 6 | — | SSE 12 | SSE 12 | — | SSE 10 | SE 10 | SSE 10 | SSE 11 | SSE 10 | S 6 | S 7 | SSE 7 | SE 7 | SE 7 |
| kJ | 2 | — | 653 | — | — | — | 62 | — | 255 | 121 | — | 43 | 25 | 10 | 11 | 10 | 12 | 32 | 54 | 49 | 50 |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | SSE 11 | S 6 | SSE 10 | SSE 9 | — | — | SSE 9 |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 23 | 3 | 10 | 8 | — | — | 8 |
Wind waves Height (m) Direction Period (s) | — | NNE 3 | N 4 | NNE 4 | NE 4 | NE 5 | NE 6 | NE 6 | NE 7 | NW 3 | ENE 8 | — | SSW 2 | S 3 | SW 3 | — | — | — | — | — | — |
| kJ | — | 3 | 13 | 19 | 15 | 34 | 109 | 101 | 327 | 2 | 356 | — | 1 | 2 | 5 | — | — | — | — | — | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 0 | 27 | 6 | 9 | 101 | 20 | 20 | 269 | 27 | 49 | 16 | 6 | 15 | 15 | 0 | 0 | 9 | 0 | 9 | 0 | 15 |
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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