Surf Forecasts:
Siriu surf forecast from 30 Aug 2026:
- Best quality surf: Sunday 6 Sep, 12AM (local time) - 10ft (3.0m), 9s period, S swell with cross-offshore winds.
- Most powerful swell: Sunday 6 Sep, 9PM (local time) - 13ft (4.0m), 12s period, S swell with 4,665 kJ wave energy.
- Next surfable swell (1★+): Sunday 30 Aug, 6PM (local time) - 3.5ft (1.0m), 8s period with E 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 30) at 6PM. The primary swell is predicted to be 1.0m and 8s period with a secondary swell of 0.5m and 5s. Another secondary swell of 0.8m and 5s is also forecast. The wind is predicted to be glassy as the swell arrives.
The most powerful waves expected at Siriu in the next 16 days are 4.0m 12s and forecast to arrive on Sunday (Sep 06) at 9PM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.4m 6s period and expected on Tuesday (Sep 01) at 6PM.
| Wave Type | Time (-03) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 6PM (Sun 30th Aug) | 3.5ft (1.0m) 8s |
| Best Surf | 12AM (Sun 6th Sep) | 10ft (3.0m) 9s |
| Most Powerful | 9PM (Sun 6th Sep) | 13ft (4.0m) 12s |
Table - best surf conditions forecast for Siriu over the next 16 days.
The Lowdown
Alright, Rusty here. Let’s break down what’s on offer at Siriu.
We start this Sunday morning with clean 1.0m easterly swell and glassy wind – a bit small, but rideable. Water temp is 19°, which is normal for this time of year. Sunday afternoon turns onshore and lousy. Monday morning shows 2.4m east swell but with messy wind and rain – skip it. Monday afternoon, though, is the first real highlight: 1.9m east swell, glassy conditions, and moderate energy (719). That’s a good session.
Tuesday morning stays clean with 1.9m east-southeast swell. This is a solid option. But the real standout is Sunday 7 September morning – the swell is 1.7m from the SSE, period hits 11 seconds (proper groundswell), wind is clean cross-off, and energy is 736 (moderate). That’s the best-shaped, most lined-up wave of the whole run.
Wednesday 4 September morning offers a small 1.5m northeast windswell with a short 6-second period – rideable but not special. After that, cross-on winds and choppy conditions take over for a few days. A gap with no real recommendations through Thursday and Friday.
Saturday 12 September morning is glassy with 1.1m south-easterly swell – fine for a longboard but nothing to rush for.
The big stuff arrives Sunday 6 September morning: 2.5m southerly swell with 10-second period, cross-off wind, and a massive combined energy of 2381 (strong). That’s expert-only, powerful, and clean. Monday 14 September afternoon also pumps 2.3m east swell with 9-second period and energy at 1590 (strong), but the cross-shore wind will mess with it a bit.
So, for a clean, fun session, hit Monday afternoon 31 August or Tuesday morning 1 September. For the big, powerful, expert-level day, it’s Sunday 6 September morning. That one is the standout.
Rusty.
Short Range ForecastHeavy rain (total 96mm), heaviest during Mon night. Warm (max 22°C on Tue afternoon, min 14°C on Tue night). Winds increasing (calm on Mon night, strong winds from the SW by Tue afternoon). | Days 5-7 Weather SummaryLight rain (total 9mm), mostly falling on Sat morning. Warm (max 21°C on Thu morning, min 12°C on Wed night). Wind will be generally light. | |||||||||||||||||||
Sun 30 | Monday 31 | Tuesday 1 | Wednesday 2 | Thursday 3 | Friday 4 | Saturday 5 | ||||||||||||||
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) | E 8 | E 8 | E 8 | ESE 8 | ESE 8 | ESE 8 | ESE 8 | SE 8 | SE 9 | SE 9 | SE 9 | SE 10 | SE 10 | SE 10 | SE 10 | SE 10 | SE 10 | ENE 8 | S 6 | S 9 |
Wave Graph  | ||||||||||||||||||||
 kJ | 130 | 205 | 565 | 244 | 226 | 352 | 390 | 734 | 418 | 328 | 328 | 240 | 222 | 173 | 80 | 60 | 35 | 63 | 157 | 1567 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross-on | glassy | cross-on | glassy | glassy | cross-off | cross-off | cross-off | cross | cross-off | cross | cross-on | cross-off | cross | cross | cross-off | cross-off | cross-off | cross-off |
High Tide | 3:14PM0.70m | 3:07AM0.80m | 3:37PM0.65m | 3:45AM0.75m | 4:01PM0.59m | 4:28AM0.68m | 4:25PM0.53m | 5:22AM0.59m | 4:44PM0.46m | 11:45PM0.33m | 11:44AM0.63m | 00:04AM0.36m | 12:25PM0.73m | 00:19AM0.41m | ||||||
Low Tide | 9:42PM0.24m | 10:20AM0.13m | 10:09PM0.25m | 11:11AM0.24m | 10:22PM0.27m | 12:29PM0.35m | 9:01PM0.27m | 8:41AM0.49m | 2:23PM0.43m | 9:02PM0.28m | 9:10PM0.30m | 3:36AM0.25m | 9:01PM0.34m | |||||||
 |  |  |  |  |  |  |  | | | | | | | | | | | | | |
 | — | — | 6:30 | — | — | 6:28 | — | — | 6:26 | — | — | 6:26 | — | — | 6:24 | — | — | 6:24 | — | — |
 | 5:59 | — | — | 6:00 | — | — | 6:00 | — | — | 6:00 | — | — | 6:00 | — | — | 6:01 | — | — | 6:01 | — |
mm | 3 | 19 | 9 | 20 | 43 | — | 2 | — | — | — | — | — | — | — | — | — | 3 | 6 | 3 | 1 |
Temp °C | 18 | 18 | 17 | 18 | 18 | 21 | 22 | 16 | 18 | 18 | 14 | 21 | 21 | 16 | 20 | 19 | 16 | 15 | 15 | 14 |
Feels °C | 19 | 19 | 19 | 18 | 20 | 22 | 22 | 10 | 14 | 14 | 14 | 16 | 16 | 13 | 19 | 16 | 14 | 14 | 13 | 11 |
Swell 1 Height (m) Direction Period (s) | E 8 | E 8 | E 8 | ESE 8 | ESE 8 | ESE 8 | ESE 8 | SE 8 | SE 9 | SE 9 | SE 9 | SE 10 | SE 10 | SE 10 | SE 10 | SE 10 | E 8 | ENE 8 | ENE 8 | S 9 |
| kJ | 130 | 205 | 329 | 244 | 226 | 352 | 390 | 555 | 418 | 328 | 328 | 240 | 222 | 173 | 80 | 60 | 35 | 63 | 49 | 1041 |
Swell 2 Height (m) Direction Period (s) | S 5 | SSE 6 | SSE 6 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | E 10 | ENE 10 | ENE 9 | ENE 9 | ENE 9 | ENE 9 | NE 5 | E 8 | SE 10 | SE 9 | SSE 13 | ENE 8 |
| kJ | 9 | 40 | 42 | 111 | 58 | 35 | 23 | 26 | 196 | 125 | 88 | 65 | 64 | 45 | 22 | 36 | 33 | 13 | 35 | 24 |
Swell 3 Height (m) Direction Period (s) | SSE 10 | SE 9 | — | SSE 6 | S 8 | — | — | — | S 6 | — | — | S 8 | S 8 | ENE 6 | E 8 | NE 5 | NE 6 | SSE 14 | SE 9 | — |
| kJ | 9 | 3 | — | 15 | 1 | — | — | — | 76 | — | — | 1 | 1 | 12 | 37 | 14 | 8 | 19 | 12 | — |
Wind waves Height (m) Direction Period (s) | SSE 6 | — | E 8 | — | — | — | — | SE 8 | — | — | — | N 3 | NNE 5 | NNE 5 | — | S 3 | S 5 | S 5 | S 6 | S 9 |
| kJ | 24 | — | 565 | — | — | — | — | 734 | — | — | — | 5 | 37 | 26 | — | 1 | 15 | 38 | 157 | 1567 |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 16 | 68 | 0 | 9 | 0 | 0 | 0 | 15 | 10 | 38 | 0 | 43 | 16 | 0 | 10 | 38 | 0 | 0 | 0 | 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.
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