Surf Forecasts:
Siriu surf forecast from 19 Aug 2026:
- Best quality surf: Saturday 22 Aug, 3AM (local time) - 7.5ft (2.3m), 9s period, S swell with cross-offshore winds.
- Most powerful swell: Monday 24 Aug, 6AM (local time) - 8ft (2.5m), 14s period, SSE swell with 2,462 kJ wave energy.
- Next surfable swell (1★+): Wednesday 19 Aug, 3AM (local time) - 4ft (1.2m), 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 Wednesday (Aug 19) at 3AM. The primary swell is predicted to be 1.2m and 8s period with a secondary swell of 0.2m and 9s. 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 2.5m 14s and forecast to arrive on Monday (Aug 24) at 6AM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.8m 8s period and expected on Saturday (Aug 22) at 9AM.
| Wave Type | Time (-03) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 3AM (Wed 19th Aug) | 4ft (1.2m) 8s |
| Best Surf | 3AM (Sat 22nd Aug) | 7.5ft (2.3m) 9s |
| Most Powerful | 6AM (Mon 24th Aug) | 8ft (2.5m) 14s |
Table - best surf conditions forecast for Siriu over the next 16 days.
The Lowdown
Alright, surfers, Rusty here. Let’s talk about what’s cooking for Siriu over the next couple of weeks. It’s a slow start, but there’s a real gem waiting if you’ve got the patience.
The week kicks off flat and ugly. Wednesday and Thursday are a total loss – the swell is weak and small, with a combined energy of only 134, and the wind is all cross or cross-onshore, just chopping everything up. Not worth getting wet.
Friday the 21st shows a tiny glimmer. The morning is clean with a light breeze, but the swell is only 3ft from the ENE with a short period. It’s surfable, but pretty ordinary. Saturday the 22nd morning is a step up – a clean 5ft south swell with moderate energy (315) and a light cross-offshore wind. Good for a beginner-friendly session.
Now, here’s the one to watch. Sunday the 23rd is the first real highlight. The morning is clean with a light breeze and a 5ft south swell, but the period jumps to 11 seconds, giving it some proper grunt. The combined energy hits 521. The cross-offshore wind means clean, lined-up waves. This is a solid session.
But the big prize is Monday the 24th. This is the top of the forecast. A proper groundswell from the SSE at 8ft with a very long 13-second period. The combined energy is a massive 2359, so there’s serious power. The morning is glassy clean with barely a breath of wind. This is excellent surf, but at 8ft, it’s for experienced surfers only. The wind swings onshore in the afternoon, so you want to be out early.
After that, the swell drops off through the second week. Tuesday and Wednesday are messy with moderate cross-shore winds and shorter, weaker swell. The water temp is about average for this time of year, nothing special.
We get a few clean windows later. Thursday the 27th afternoon has a clean 4ft ENE swell with offshore wind from the WNW. Friday the 28th afternoon is also clean with a light breeze and a 3ft ENE swell – good for a log.
The final weekend and into September is small and inconsistent. There are a couple of glassy mornings on Saturday the 29th and Tuesday the 1st of September, but the swell is tiny. The pattern just fades out.
So, to put it simply: wait until Sunday the 23rd for the first proper go, and then Monday the 24th is the absolute standout – a powerful, clean groundswell for the experts. Don't miss it.
Rusty.
Short Range ForecastMostly dry. Warm (max 24°C on Thu afternoon, min 16°C on Fri afternoon). Wind will be generally light. | Days 5-7 Weather SummaryMostly dry. Very mild (max 15°C on Fri night, min 11°C on Sun night). Wind will be generally light. | ||||||||||||||||||
Wednesday 19 | Thursday 20 | Friday 21 | Saturday 22 | Sunday 23 | Monday 24 | ||||||||||||||
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 9 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 7 | ENE 7 | S 7 | S 7 | S 9 | S 8 | S 8 | S 8 | S 11 | S 10 | SSE 12 | SSE 13 | SSE 14 | SSE 13 |
Wave Graph  | |||||||||||||||||||
 kJ | 245 | 125 | 107 | 77 | 94 | 114 | 40 | 62 | 210 | 1099 | 260 | 203 | 208 | 505 | 556 | 1200 | 2354 | 2078 | 1336 |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | glassy | cross | cross | glassy | cross | cross-on | cross-off | cross-off | cross | cross-off | cross-off | cross | cross-off | cross-off | cross | cross-off | cross-off | on | cross |
High Tide | 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 | 12:57PM0.68m | 11:53PM0.52m | 1:15PM0.72m | 00:17AM0.60m | ||||||
Low Tide | 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 | 5:20AM0.18m | 6:39PM0.35m | 6:07AM0.11m | 7:01PM0.31m | ||||||
 |  |  |  | | |  | | | | |  | | | | | | | | |
 | — | 6:41 | — | — | 6:41 | — | — | 6:39 | — | — | 6:39 | — | — | 6:37 | — | — | 6:37 | — | — |
 | — | — | 5:53 | — | — | 5:53 | — | — | 5:54 | — | — | 5:54 | — | — | 5:55 | — | — | 5:55 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 23 | 22 | 20 | 19 | 23 | 24 | 20 | 20 | 19 | 15 | 15 | 14 | 13 | 15 | 14 | 13 | 15 | 15 | 14 |
Feels °C | 25 | 22 | 21 | 21 | 21 | 22 | 20 | 16 | 15 | 11 | 12 | 10 | 10 | 13 | 10 | 9 | 13 | 12 | 12 |
Swell 1 Height (m) Direction Period (s) | ENE 9 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | S 9 | ENE 7 | S 7 | ENE 7 | S 9 | S 8 | S 8 | S 8 | S 11 | S 10 | SSE 12 | SSE 13 | SSE 14 | SSE 13 |
| kJ | 245 | 125 | 107 | 77 | 94 | 55 | 40 | 57 | 49 | 637 | 260 | 203 | 208 | 505 | 367 | 1200 | 2354 | 2078 | 1336 |
Swell 2 Height (m) Direction Period (s) | S 9 | S 9 | S 8 | S 7 | S 6 | SE 12 | ENE 5 | ENE 7 | — | ENE 8 | ENE 8 | ENE 9 | ENE 8 | NE 8 | SSE 13 | ENE 7 | ENE 7 | NE 7 | NE 7 |
| kJ | 6 | 2 | 5 | 15 | 21 | 6 | 14 | 62 | — | 68 | 55 | 58 | 28 | 16 | 242 | 5 | 5 | 2 | 2 |
Swell 3 Height (m) Direction Period (s) | E 14 | SE 12 | SE 13 | S 11 | S 9 | — | S 8 | SE 5 | — | — | — | S 12 | SSE 13 | — | ENE 8 | — | — | ENE 7 | — |
| kJ | 4 | 6 | 7 | 20 | 42 | — | 21 | 1 | — | — | — | 3 | 34 | — | 11 | — | — | 5 | — |
Wind waves Height (m) Direction Period (s) | — | S 3 | S 3 | — | — | ENE 7 | — | — | S 7 | S 9 | SSW 8 | — | — | — | S 10 | — | — | — | NNE 7 |
| kJ | — | 1 | 2 | — | — | 114 | — | — | 210 | 1099 | 448 | — | — | — | 556 | — | — | — | 5 |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 0 | 15 | 15 | 0 | 9 | 16 | 0 | 0 | 38 | 13 | 0 | 15 | 0 | 0 | 38 | 0 | 0 | 27 | 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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