
Surf Forecasts:
Siriu surf forecast from 2 Aug 2026:
- Best quality surf: Tuesday 4 Aug, 6PM (local time) - 3.5ft (1.0m), 12s period, SSE swell with cross-offshore winds.
- Most powerful swell: Sunday 9 Aug, 3PM (local time) - 7.5ft (2.3m), 14s period, S swell with 1,933 kJ wave energy.
- Next surfable swell (1★+): Sunday 2 Aug, 9PM (local time) - 3.5ft (1.0m), 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 Sunday (Aug 02) at 9PM. The primary swell is predicted to be 1.0m and 8s period. The wind is predicted to be glassy as the swell arrives.
The most powerful waves expected at Siriu in the next 16 days are 2.3m 14s and forecast to arrive on Sunday (Aug 09) 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 0.8m 4s period and expected on Saturday (Aug 08) at 12AM.
| Wave Type | Time (-03) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 9PM (Sun 2nd Aug) | 3.5ft (1.0m) 8s |
| Best Surf | 6PM (Tue 4th Aug) | 3.5ft (1.0m) 12s |
| Most Powerful | 3PM (Sun 9th Aug) | 7.5ft (2.3m) 14s |
Table - best surf conditions forecast for Siriu over the next 16 days.
The Lowdown
G'day, Rusty here, looking at what's on offer for Siriu over the next couple of weeks. Straight up, this stretch is a bit of a mixed bag. We've got a slow start, a few days of weak, sloppy surf, but then a real pulse of energy comes through towards the end of the first week and into the second. The water temp is sitting at 67°, which is about average for this time of year.
The first few days are pretty ordinary. Sunday the 2nd and Monday the 3rd of August have small, short-period swell, around 3ft to 4ft, with a cross-onshore or cross wind making it choppy. Not worth getting wet for. Tuesday the 4th sees a jump in energy with a combined energy value of 452, but the swell is a bit mixed and conditions are still marginal.
The first real standout comes on Wednesday the 5th. The morning session looks clean with a light cross-offshore wind from the SSW and a 3ft SSE swell at 10 seconds. The combined energy is 209 (moderate), but the real beauty is the glassy conditions on the afternoon, with the wind dropping to a glassy 3 mph from the ESE and the swell holding at 3ft. It's not a big day, but it will be clean and fun for a beginner-friendly spot.
After a bit of a lull Thursday and Friday, things start to get interesting. The standout of the entire forecast is definitely Monday the 10th of August. The afternoon session shapes up with a clean 5ft SSE groundswell, a 14-second period, and a light cross-offshore wind from the SW. The combined energy is a solid 1071 (strong). This is a proper, clean groundswell with good power. The 14-second period means longer gaps between sets, making it easier to get out the back, and the cross-offshore wind will keep the faces tidy. This is the pick of the fortnight for experienced surfers, as the 5ft size is getting a bit chunky for beginners.
Tuesday the 11th also looks excellent for the experienced crew, with an 8ft S swell and a 12-second period, offering powerful waves. The morning is clean with a cross-offshore wind, but the size is pushing into expert-only territory. The following Wednesday morning the 12th is also a standout, with a glassy 6ft SSE swell. It's a bit smaller than Tuesday, but the glassy conditions and the 12-second period will make for some really nice, clean waves.
From Thursday the 13th onwards, the swell eases back down to the 4ft to 5ft range, but conditions remain mostly clean through the mornings, making for some fun, smaller waves. The 14th and 15th of August have some clean morning windows with light winds, but the swell is a bit smaller and the period is dropping. The second week has less energy overall, but some clean mornings with small waves are still possible.
Overall, the best windows are the afternoon of Monday the 10th, and the mornings of Tuesday the 11th and Wednesday the 12th. Get in the water for those.
Rusty.
Short Range ForecastLight rain (total 5mm), mostly falling on Tue afternoon. Warm (max 24°C on Tue morning, min 16°C on Sun afternoon). Wind will be generally light. | Days 4-6 Weather SummaryLight rain (total 6mm), mostly falling on Wed afternoon. Warm (max 26°C on Thu morning, min 16°C on Fri night). Wind will be generally light. | ||||||||||||||||||||
Sunday 2 | Monday 3 | Tuesday 4 | Wednesday 5 | Thursday 6 | Friday 7 | Saturday 8 | |||||||||||||||
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 7 | ENE 8 | ENE 8 | ENE 8 | ENE 7 | S 12 | SSE 12 | SSE 12 | SSE 11 | SSE 10 | SSE 10 | SSE 9 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | S 7 | S 8 |
Wave Graph | |||||||||||||||||||||
157 | 128 | 110 | 81 | 61 | 77 | 232 | 293 | 210 | 149 | 111 | 78 | 67 | 83 | 60 | 66 | 98 | 101 | 67 | 196 | 216 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross-on | glassy | cross | cross-on | cross | cross | cross-on | glassy | cross-off | glassy | cross | cross-off | cross-on | glassy | cross | cross | cross-off | cross | cross | cross |
High Tide | 4:19PM0.67m | 4:05AM0.74m | 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 | ||||||||
Low Tide | 10:45AM0.07m | 11:00PM0.32m | 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 | ||||||
6:56 | — | — | 6:54 | — | — | 6:54 | — | — | 6:54 | — | — | 6:52 | — | — | 6:52 | — | — | 6:50 | — | — | |
— | 5:45 | — | — | 5:45 | — | — | 5:45 | — | — | 5:46 | — | — | 5:46 | — | — | 5:47 | — | — | 5:47 | — | |
mm | — | — | — | — | — | — | — | 4 | 1 | — | 3 | 1 | — | 1 | — | — | 1 | — | 3 | 4 | 6 |
Temp °C | 19 | 18 | 16 | 21 | 23 | 19 | 24 | 24 | 20 | 21 | 20 | 19 | 26 | 22 | 18 | 24 | 25 | 23 | 16 | 16 | 18 |
Feels °C | 18 | 17 | 17 | 20 | 22 | 19 | 25 | 26 | 22 | 23 | 22 | 19 | 27 | 23 | 19 | 24 | 24 | 24 | 14 | 16 | 19 |
Swell 1 Height (m) Direction Period (s) | ENE 7 | ENE 8 | ENE 8 | ENE 8 | ENE 7 | ENE 7 | SSE 12 | SSE 12 | SSE 11 | SSE 10 | SSE 10 | SSE 9 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | SSE 8 | ENE 8 | ENE 8 | ENE 8 | S 8 |
157 | 128 | 110 | 81 | 61 | 62 | 232 | 293 | 210 | 149 | 111 | 78 | 67 | 83 | 60 | 66 | 24 | 101 | 64 | 51 | 138 | |
Swell 2 Height (m) Direction Period (s) | S 10 | S 10 | SSW 5 | S 6 | S 6 | S 12 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | SSE 9 | SSE 9 | SSE 8 | SSE 8 | S 10 | SE 8 | S 11 | — | ENE 8 |
2 | 2 | 5 | 5 | 5 | 77 | 61 | 59 | 47 | 48 | 49 | 48 | 65 | 59 | 55 | 36 | 17 | 15 | 2 | — | 45 | |
Swell 3 Height (m) Direction Period (s) | — | S 10 | S 9 | SSE 15 | SSE 13 | SE 11 | SE 11 | ESE 11 | ESE 11 | ESE 11 | E 11 | S 11 | SE 14 | SSE 13 | SSE 11 | SSE 10 | — | S 9 | S 9 | — | SE 7 |
— | 2 | 2 | 21 | 35 | 32 | 30 | 11 | 11 | 12 | 2 | 2 | 7 | 16 | 13 | 11 | — | 6 | 2 | — | 2 | |
Wind waves Height (m) Direction Period (s) | SSW 3 | S 6 | — | — | NE 3 | NNE 4 | N 4 | NE 7 | — | — | — | — | NW 3 | — | — | NNE 3 | ENE 8 | N 4 | S 5 | S 7 | S 8 |
2 | 9 | — | — | 2 | 21 | 27 | 89 | — | — | — | — | 1 | — | — | 3 | 98 | 21 | 67 | 196 | 216 | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 0 | 15 | 0 | 9 | 16 | 9 | 9 | 9 | 0 | 0 | 0 | 6 | 0 | 9 | 0 | 9 | 20 | 0 | 25 | 10 | 6 |
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.











