Surf Forecasts:
Siriu surf forecast from 3 Aug 2026:
- Best quality surf: Sunday 9 Aug, 12AM (local time) - 5ft (1.6m), 16s period, SSE swell with cross-offshore winds.
- Most powerful swell: Monday 10 Aug, 3PM (local time) - 8ft (2.4m), 12s period, S swell with 1,624 kJ wave energy.
- Next surfable swell (1★+): Tuesday 4 Aug, 6AM (local time) - 2.5ft (0.8m), 12s 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 Tuesday (Aug 04) at 6AM. The primary swell is predicted to be 0.8m and 12s period with a secondary swell of 0.8m and 7s. Another secondary swell of 0.8m and 4s 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 2.4m 12s and forecast to arrive on Monday (Aug 10) at 3PM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.0m 5s period and expected on Sunday (Aug 09) at 12PM.
| Wave Type | Time (-03) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 6AM (Tue 4th Aug) | 2.5ft (0.8m) 12s |
| Best Surf | 12AM (Sun 9th Aug) | 5ft (1.6m) 16s |
| Most Powerful | 3PM (Mon 10th Aug) | 8ft (2.4m) 12s |
Table - best surf conditions forecast for Siriu over the next 16 days.
The Lowdown
Right, let’s have a look at the surf situation coming up for Siriu. I gotta be straight with you – the next few days are pretty bleak. We’ve got small, weak swell and the wind is all wrong. Monday and Tuesday are a write-off with light cross-onshore winds and tiny waves, barely breaking 3ft. The water temp is sitting at 68°, which is a touch warmer than normal for this time of year, so that’s something.
It stays pretty ordinary through Wednesday and Thursday – small swell, cross-shore winds, and poor conditions. Honestly, nothing to get excited about. Friday morning (7 August) might give us a brief window with a light cross-offshore breeze and a bit of 4ft swell from the ENE, but it’s very average.
Then we hit a real turning point. Saturday the 8th of August, the swell starts to ramp up. We get a solid 5ft S groundswell with a long 18-second period – that’s got some serious push behind it. The combined wave energy is strong at 1735. The wind is cross-shore, so not perfect, but the quality is building. Sunday sees it drop a little, still solid though.
Now, the standout is Monday the 10th of August. Monday afternoon at Siriu we’ve got a clean 8ft S swell with a 12-second period and a light cross-offshore breeze. The combined energy is pumping at 2656 – this is the best on offer by far. The water will be clean, the waves will have power. This is for experienced surfers only, 8ft is big. Tuesday the 11th holds similar size but with stronger winds, still rideable.
We get a bit of a lull midweek, but then Thursday the 13th of August morning looks good again – 5ft SSE groundswell, light cross-offshore wind, and clean conditions. Then Thursday afternoon it goes glassy with a light offshore from the NW and 4ft SSE swell – that’s a gem. Very clean.
Saturday the 15th morning has clean 4ft S swell, and Sunday the 16th morning also has clean 4ft SSE swell. Those are decent. After that, the swell fades and the wind turns poor again from Monday the 17th onward.
So to wrap it up: the first week is mostly a dud. The real highlight is Monday afternoon the 10th of August for the big, clean S swell. Thursday the 13th afternoon is another great window with glassy conditions. Don’t waste your energy before that unless you’re desperate for a paddle.
Rusty.
Short Range ForecastLight rain (total 6mm), mostly falling on Tue afternoon. Warm (max 25°C on Wed afternoon, min 18°C on Mon morning). Wind will be generally light. | Days 4-6 Weather SummaryLight rain (total 7mm), mostly falling on Sat night. Warm (max 27°C on Thu morning, min 14°C on Fri night). Wind will be generally light. | ||||||||||||||||||||
Monday 3 | Tuesday 4 | Wednesday 5 | Thursday 6 | Friday 7 | Saturday 8 | Sunday 9 | |||||||||||||||
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 7 | ENE 7 | SSE 12 | SSE 12 | SSE 11 | SSE 10 | SSE 10 | SSE 10 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | S 9 | S 18 | SSE 16 | SSE 16 | SSE 14 | SSE 14 | SSE 13 |
Wave Graph  | |||||||||||||||||||||
 kJ | 81 | 61 | 79 | 232 | 298 | 210 | 118 | 111 | 80 | 93 | 123 | 120 | 138 | 131 | 140 | 1437 | 1210 | 1255 | 862 | 572 | 372 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross-on | cross | cross | cross-on | glassy | cross | cross-on | cross | cross | cross | cross | cross-off | cross-on | cross | cross | cross | cross-off | cross | cross-off | cross-off |
High Tide | 4:50PM0.62m | 4:48AM0.68m | 5:24PM0.56m | 5:42AM0.61m | 6:02PM0.48m | 7:06AM0.54m | 6:49PM0.41m | 12:18PM0.66m | 00:27AM0.42m | 1:03PM0.75m | 00:42AM0.45m | 1:43PM0.81m | 00:39AM0.49m | ||||||||
Low Tide | 11:34AM0.15m | 11:49PM0.33m | 12:39PM0.24m | 00:58AM0.34m | 2:08PM0.32m | 9:41PM0.38m | 9:11AM0.52m | 3:56PM0.36m | 9:30PM0.37m | 3:48AM0.28m | 5:46PM0.34m | 5:03AM0.19m | 6:53PM0.31m | 6:02AM0.10m | 7:33PM0.30m | ||||||
 |  |  | |  |  | | | | | |  | | |  | | | |  | |  | |
 | 6:54 | — | — | 6:54 | — | — | 6:54 | — | — | 6:52 | — | — | 6:52 | — | — | 6:50 | — | — | 6:50 | — | — |
 | — | 5:45 | — | — | 5:45 | — | — | 5:46 | — | — | 5:46 | — | — | 5:47 | — | — | 5:47 | — | — | 5:49 | — |
mm | — | — | — | — | 2 | 4 | — | — | — | — | — | 1 | 1 | — | — | — | — | 5 | 4 | 2 | 4 |
Temp °C | 21 | 23 | 19 | 24 | 24 | 20 | 24 | 25 | 20 | 27 | 27 | 22 | 21 | 17 | 16 | 15 | 17 | 18 | 17 | 16 | 13 |
Feels °C | 20 | 22 | 19 | 24 | 24 | 22 | 25 | 25 | 22 | 26 | 25 | 22 | 21 | 15 | 13 | 12 | 14 | 18 | 16 | 13 | 9 |
Swell 1 Height (m) Direction Period (s) | ENE 8 | ENE 7 | ENE 7 | SSE 12 | SSE 12 | SSE 11 | SSE 10 | ENE 7 | ENE 7 | ENE 8 | SSE 9 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | S 18 | SSE 16 | SSE 16 | SSE 14 | SSE 14 | SSE 13 |
| kJ | 81 | 61 | 79 | 232 | 298 | 210 | 118 | 66 | 50 | 93 | 44 | 120 | 138 | 131 | 140 | 1437 | 1210 | 1255 | 862 | 572 | 372 |
Swell 2 Height (m) Direction Period (s) | S 6 | S 6 | S 12 | ENE 7 | ESE 10 | ENE 7 | ENE 7 | SSE 10 | SSE 10 | SSE 9 | SSE 13 | SE 9 | SSE 10 | S 7 | S 9 | ENE 8 | — | NE 8 | ENE 8 | ENE 8 | ENE 8 |
| kJ | 5 | 6 | 77 | 61 | 11 | 45 | 47 | 111 | 80 | 47 | 16 | 19 | 20 | 65 | 120 | 125 | — | 176 | 103 | 76 | 53 |
Swell 3 Height (m) Direction Period (s) | SSE 15 | SSE 13 | SE 11 | SE 11 | — | ESE 11 | ESE 11 | S 12 | SE 16 | SSE 14 | S 10 | SSE 11 | SSE 8 | SE 8 | S 8 | ENE 8 | — | — | E 15 | E 14 | E 13 |
| kJ | 21 | 35 | 32 | 30 | — | 11 | 11 | 3 | 10 | 18 | 7 | 25 | 7 | 3 | 1 | 173 | — | — | 4 | 4 | 4 |
Wind waves Height (m) Direction Period (s) | — | NE 3 | NNE 4 | NNE 4 | ENE 7 | — | — | NE 7 | N 3 | N 4 | ENE 8 | N 4 | S 3 | — | — | — | NE 8 | N 4 | S 3 | S 6 | S 7 |
| kJ | — | 2 | 16 | 24 | 59 | — | — | 91 | 8 | 9 | 123 | 36 | 1 | — | — | — | 206 | 28 | 5 | 124 | 183 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 9 | 16 | 9 | 6 | 20 | 0 | 6 | 20 | 6 | 6 | 9 | 9 | 0 | 13 | 10 | 6 | 9 | 0 | 10 | 23 | 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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