Surf Forecasts:
Siriu surf forecast from 16 Aug 2026:
- Best quality surf: Saturday 22 Aug, 9AM (local time) - 6ft (1.8m), 9s period, S swell with cross-offshore winds.
- Most powerful swell: Sunday 23 Aug, 3AM (local time) - 5.5ft (1.7m), 12s period, S swell with 870 kJ wave energy.
- Next surfable swell (1★+): Tuesday 18 Aug, 6PM (local time) - 5ft (1.5m), 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 Tuesday (Aug 18) at 6PM. The primary swell is predicted to be 1.5m and 8s period with a secondary swell of 0.1m and 10s. 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 1.7m 12s and forecast to arrive on Sunday (Aug 23) at 3AM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.6m 5s period and expected on Tuesday (Aug 18) at 6PM.
| Wave Type | Time (-03) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 6PM (Tue 18th Aug) | 5ft (1.5m) 8s |
| Best Surf | 9AM (Sat 22nd Aug) | 6ft (1.8m) 9s |
| Most Powerful | 3AM (Sun 23rd Aug) | 5.5ft (1.7m) 12s |
Table - best surf conditions forecast for Siriu over the next 16 days.
The Lowdown
Alright, this is Rusty, and here’s how things are shaping up for Siriu over the next couple of weeks.
Right off the bat, the surf forecast is pretty flat. We’ve got a few small, weak pulses coming through, but honestly, the first week is a write-off. The water temp is sitting around 66°F with only a slight anomaly, so pretty normal for this time of year at Siriu.
The real standout here, and I mean the only one worth getting excited about, lands on Sunday the 23rd of August. The morning is looking glassy, with a solid 8ft swell out of the S, pushing moderate energy (934). That’s a good size – not beginner territory, but fine for anyone with a bit of experience. The clean conditions should make for some proper waves.
The day before, Saturday the 22nd, the morning has a clean cross-off breeze with a 4ft S swell, but the energy is only moderate (436). It’s a decent warm-up, but Sunday is clearly the pick.
After that, the swell drops back. Monday the 24th still has some size – 8ft S swell in the morning with clean cross-off wind and strong energy (2150) – but it's a bit of a beast. Over 8ft in the afternoon, so that’s expert-only territory. The following days drop off quickly, with some smaller S and SSE swells in the last week, but nothing that matches that Sunday session.
So, if you’re keen, circle Sunday the 23rd. Get on it early. Otherwise, it’s a lot of waiting around for not much.
Rusty
Short Range ForecastSome drizzle, heaviest during Sun morning. Warm (max 29°C on Tue morning, min 18°C on Sun morning). Winds decreasing (fresh winds from the NNE on Mon afternoon, calm by Tue night). | Days 4-6 Weather SummaryMostly dry. Warm (max 24°C on Thu afternoon, min 15°C on Fri night). Wind will be generally light. | ||||||||||||||||||||
Sunday 16 | Monday 17 | Tuesday 18 | Wednesday 19 | Thursday 20 | Friday 21 | Saturday 22 | |||||||||||||||
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) | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | NE 8 | NE 8 | NE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | NE 8 | ENE 7 | ENE 7 | ENE 8 | ENE 8 | S 9 | S 10 | S 12 |
Wave Graph  | |||||||||||||||||||||
 kJ | 539 | 365 | 452 | 285 | 356 | 608 | 517 | 530 | 234 | 153 | 113 | 102 | 154 | 164 | 94 | 114 | 123 | 110 | 517 | 621 | 748 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross-on | cross | cross | cross-on | cross | cross | cross-on | glassy | cross-off | cross | glassy | cross | cross-on | cross | off | cross | glassy | cross-off | cross-on | cross-off |
High Tide | 3:38PM0.61m | 3:40AM0.73m | 3:57PM0.60m | 4:19AM0.67m | 4:18PM0.58m | 5:03AM0.59m | 4:39PM0.55m | 6:01AM0.51m | 12:32PM0.51m | 11:59PM0.31m | 12:33PM0.57m | 11:21PM0.37m | 12:43PM0.63m | 11:30PM0.44m | |||||||
Low Tide | 10:23AM0.16m | 9:19PM0.29m | 10:38AM0.26m | 9:15PM0.26m | 9:51AM0.35m | 9:35PM0.25m | 9:21AM0.40m | 10:01PM0.27m | 9:02AM0.45m | 2:44PM0.49m | 10:27PM0.31m | 10:38PM0.37m | 4:12AM0.25m | 6:30PM0.40m | |||||||
 |  |  |  | |  | | | | |  | | | | | | | | | |  | |
 | 6:45 | — | — | 6:43 | — | — | 6:43 | — | — | 6:41 | — | — | 6:41 | — | — | 6:39 | — | — | 6:39 | — | — |
 | — | 5:52 | — | — | 5:52 | — | — | 5:53 | — | — | 5:53 | — | — | 5:53 | — | — | 5:54 | — | — | 5:54 | — |
mm | 1 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 2 |
Temp °C | 19 | 19 | 19 | 23 | 23 | 19 | 29 | 29 | 23 | 21 | 20 | 18 | 23 | 24 | 22 | 21 | 21 | 16 | 14 | 14 | 13 |
Feels °C | 17 | 17 | 17 | 20 | 20 | 18 | 28 | 30 | 26 | 20 | 20 | 20 | 20 | 22 | 21 | 18 | 18 | 16 | 12 | 12 | 12 |
Swell 1 Height (m) Direction Period (s) | E 8 | SSE 10 | ENE 8 | ENE 8 | SSE 10 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | S 9 | ENE 7 | ENE 7 | ENE 8 | ENE 8 | S 9 | S 10 | S 12 |
| kJ | 377 | 118 | 339 | 285 | 19 | 351 | 323 | 351 | 234 | 153 | 113 | 102 | 102 | 24 | 94 | 114 | 123 | 110 | 359 | 621 | 748 |
Swell 2 Height (m) Direction Period (s) | SSE 10 | E 13 | SSE 10 | SSE 10 | SE 8 | SSE 11 | S 10 | S 10 | S 9 | S 9 | S 8 | SE 5 | S 7 | SSE 6 | S 8 | S 8 | S 8 | S 8 | ENE 8 | ENE 8 | ENE 8 |
| kJ | 121 | 13 | 80 | 39 | 3 | 11 | 8 | 8 | 6 | 2 | 1 | 11 | 32 | 15 | 12 | 11 | 99 | 102 | 71 | 47 | 48 |
Swell 3 Height (m) Direction Period (s) | — | — | E 13 | E 12 | E 12 | SE 8 | SE 9 | SE 8 | E 14 | SE 8 | SE 13 | SSE 11 | S 9 | SE 12 | SSE 6 | SSE 6 | SE 6 | S 17 | — | — | — |
| kJ | — | — | 13 | 3 | 3 | 3 | 3 | 3 | 4 | 2 | 7 | 23 | 27 | 6 | 4 | 4 | 2 | 6 | — | — | — |
Wind waves Height (m) Direction Period (s) | ENE 8 | ENE 8 | ENE 8 | N 4 | ENE 8 | NE 8 | NE 8 | NE 8 | SSW 3 | S 4 | — | — | ENE 8 | NE 8 | N 4 | SSW 4 | — | — | S 9 | — | — |
| kJ | 539 | 365 | 452 | 40 | 356 | 608 | 517 | 530 | 4 | 2 | — | — | 154 | 164 | 9 | 1 | — | — | 517 | — | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 16 | 16 | 91 | 49 | 101 | 9 | 43 | 9 | 0 | 0 | 15 | 0 | 9 | 16 | 0 | 0 | 15 | 21 | 0 | 13 | 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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