Surf Forecasts:
Siriu surf forecast from 28 Aug 2026:
- Best quality surf: Tuesday 1 Sep, 6PM (local time) - 10ft (3.0m), 12s period, S swell with cross-offshore winds.
- Most powerful swell: Wednesday 2 Sep, 12AM (local time) - 13ft (4.0m), 12s period, S swell with 4,643 kJ wave energy.
- Next surfable swell (1★+): Saturday 29 Aug, 6AM (local time) - 4.5ft (1.4m), 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 Saturday (Aug 29) at 6AM. The primary swell is predicted to be 1.4m and 8s period with a secondary swell of 0.4m 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 4.0m 12s and forecast to arrive on Wednesday (Sep 02) at 12AM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 4.5m 11s period and expected on Tuesday (Sep 01) at 6PM.
| Wave Type | Time (-03) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 6AM (Sat 29th Aug) | 4.5ft (1.4m) 8s |
| Best Surf | 6PM (Tue 1st Sep) | 10ft (3.0m) 12s |
| Most Powerful | 12AM (Wed 2nd Sep) | 13ft (4.0m) 12s |
Table - best surf conditions forecast for Siriu over the next 16 days.
The Lowdown
Alright, Rusty here. Let’s check the forecast for Siriu in feet and Fahrenheit. The water is 64°, which is a bit cooler than normal for this time of year – you’ll feel that.
Friday the 28th is a waste – 7ft from the NE, cross-shore wind, and a rough chop. Don’t bother.
Saturday the 29th morning is the first surfable chance. Swell drops to 5ft from the ENE, short period around 8 seconds, but the wind is light and cross-offshore – clean, small, and friendly. Energy is moderate at 275.
Sunday the 30th morning is similar: 4ft east swell, light cross-off breeze, clean, moderate energy (201). Rain might spit, but the waves are fine.
Monday the 31st: 5ft, period lengthening to 9 seconds, but wind turns northerly and puts a chop on it – marginal.
Tuesday 1st September morning is tiny at 3ft, but Tuesday afternoon sees a 7ft south swell come in with a 9-second period, clean cross-offshore winds, and energy jumping to 890. That’s the first real pulse.
But the best of the bunch? Wednesday 2nd September morning. Swell hits 8ft from the SSE, period at 11 seconds, gentle cross-offshore breeze, and energy roaring at 1656. This is for experienced surfers only – too big for beginners. The long period gives it real power.
Thursday 3rd September morning is a clean glassy session: 6ft SSE, 10-second period, energy 648. Very good.
Then a long gap: Friday 4th through Sunday 6th is flat and poor. Nearly 4 days of nothing.
Monday 7th September morning is another solid pulse: 7ft from the SSE, 13-second period (very long groundswell), light cross-offshore wind, energy 1801. Huge, clean, but that long period might make it wall up and close out at the beach – still excellent for strong paddlers.
Tuesday 8th morning holds at 6ft, 14-second period, still clean but wind starts to pick up. After that, the energy fades through the week.
By Friday 11th and Saturday 12th, it’s a messy 6ft to 8ft cross-shore chop with onshore winds. Not for surfing, maybe for kiting.
So the clear winners: Wednesday 2nd September morning and Monday 7th September morning – both for the crew who can handle size and power. Beginners, get your waves on Saturday 29th and Sunday 30th August mornings when it’s clean and small.
Rusty.
Short Range ForecastModerate rain (total 14mm), heaviest on Sun night. Warm (max 27°C on Fri afternoon, min 18°C on Fri night). Wind will be generally light. | Days 4-6 Weather SummaryModerate rain (total 14mm), heaviest on Mon morning. Warm (max 21°C on Mon morning, min 11°C on Wed night). Winds decreasing (fresh winds from the SSW on Tue afternoon, calm by Wed night). | ||||||||||||||||||||
Friday 28 | Saturday 29 | Sunday 30 | Monday 31 | Tuesday 1 | Wednesday 2 | Thursday 3 | |||||||||||||||
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) | NE 8 | NE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | E 8 | E 8 | E 8 | E 9 | E 9 | ENE 9 | ENE 8 | S 9 | S 12 | SSE 11 | SSE 11 | SSE 10 | SSE 10 | SSE 10 | S 9 |
Wave Graph  | |||||||||||||||||||||
 kJ | 559 | 371 | 257 | 250 | 206 | 202 | 177 | 172 | 217 | 304 | 263 | 134 | 122 | 750 | 4643 | 1568 | 1219 | 663 | 616 | 598 | 211 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross | cross | cross-off | cross-on | cross-off | cross-off | cross-on | cross | cross | cross | cross-off | cross-off | cross-off | cross-off | cross-off | cross-on | off | glassy | on | cross |
High Tide | 2:31PM0.76m | 2:02AM0.81m | 2:52PM0.74m | 2:33AM0.82m | 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 | |||||||
Low Tide | 8:45PM0.24m | 9:04AM-0.02m | 9:14PM0.24m | 9:40AM0.04m | 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 | |||||||
 | |  | | | |  | | |  |  | |  | |  | | | | | |  | |
 | 6:33 | — | — | 6:31 | — | — | 6:31 | — | — | 6:30 | — | — | 6:28 | — | — | 6:26 | — | — | 6:26 | — | — |
 | — | 5:58 | — | — | 5:59 | — | — | 5:59 | — | — | 6:00 | — | — | 6:00 | — | — | 6:00 | — | — | 6:00 | — |
mm | — | — | 1 | — | — | 2 | 2 | 3 | 6 | 11 | 2 | 1 | — | — | — | — | — | — | — | — | — |
Temp °C | 26 | 27 | 19 | 19 | 21 | 19 | 19 | 20 | 20 | 21 | 20 | 19 | 20 | 20 | 15 | 17 | 16 | 13 | 15 | 16 | 15 |
Feels °C | 24 | 26 | 20 | 20 | 22 | 19 | 20 | 20 | 21 | 20 | 19 | 19 | 14 | 14 | 10 | 14 | 13 | 12 | 14 | 14 | 12 |
Swell 1 Height (m) Direction Period (s) | ENE 8 | SSE 11 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | E 8 | E 8 | E 8 | E 9 | E 9 | SE 7 | ENE 8 | ENE 8 | S 12 | SSE 11 | SSE 11 | SSE 10 | SSE 10 | SSE 10 | S 9 |
| kJ | 322 | 79 | 257 | 250 | 206 | 202 | 177 | 172 | 217 | 304 | 263 | 119 | 122 | 103 | 2667 | 1568 | 1219 | 663 | 616 | 598 | 211 |
Swell 2 Height (m) Direction Period (s) | SSE 12 | — | SSE 10 | SE 10 | SSE 10 | SSE 10 | S 5 | S 5 | SSE 6 | SSE 6 | SSE 7 | ENE 9 | ESE 7 | ESE 8 | ENE 10 | ENE 10 | ENE 10 | ENE 9 | ENE 9 | ENE 9 | SE 10 |
| kJ | 121 | — | 43 | 25 | 10 | 9 | 14 | 9 | 11 | 30 | 57 | 134 | 66 | 37 | 106 | 80 | 77 | 50 | 32 | 26 | 85 |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | SSE 10 | SSE 10 | SE 9 | — | — | — | E 8 | — | — | ESE 9 | ESE 10 | — | — | — | ENE 8 |
| kJ | — | — | — | — | — | — | 10 | 9 | 3 | — | — | — | 35 | — | — | 8 | 10 | — | — | — | 24 |
Wind waves Height (m) Direction Period (s) | NE 8 | NE 8 | — | SSW 2 | SSW 3 | S 4 | S 5 | — | — | — | — | — | SSW 3 | S 9 | S 12 | — | — | — | — | — | NNE 4 |
| kJ | 559 | 371 | — | 1 | 3 | 9 | 14 | — | — | — | — | — | 1 | 750 | 4643 | — | — | — | — | — | 10 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 27 | 43 | 15 | 0 | 25 | 0 | 0 | 16 | 9 | 9 | 16 | 0 | 15 | 187 | 12 | 0 | 13 | 0 | 0 | 27 | 9 |
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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