Surf Forecasts:
Siriu surf forecast from 26 Jul 2026:
- Best quality surf: Monday 27 Jul, 6AM (local time) - 2.5ft (0.8m), 8s period, ESE swell with glassy winds.
- Most powerful swell: Sunday 26 Jul, 6AM (local time) - 3ft (0.9m), 12s period, SSE swell with 252 kJ wave energy.
- Next surfable swell (1★+): Monday 27 Jul, 3AM (local time) - 2.5ft (0.8m), 8s period with ESE 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 Monday (Jul 27) at 3AM. The primary swell is predicted to be 0.8m and 8s period with a secondary swell of 0.5m and 4s. Another secondary swell of 1.0m and 5s 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 0.9m 12s and forecast to arrive on Sunday (Jul 26) at 6AM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.8m 5s period and expected on Thursday (Jul 30) at 6PM.
| Wave Type | Time (-03) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 3AM (Mon 27th Jul) | 2.5ft (0.8m) 8s |
| Best Surf | 6AM (Mon 27th Jul) | 2.5ft (0.8m) 8s |
| Most Powerful | 6AM (Sun 26th Jul) | 3ft (0.9m) 12s |
Table - best surf conditions forecast for Siriu over the next 16 days.
The Lowdown
Alright, this is Rusty. Let’s break down what Siriu has in store for us over the next couple of weeks.
First off, I’m not gonna sugarcoat it – we’ve got a serious drought of surf from Sunday the 26th all the way through about Tuesday the 4th of August. That’s a long, quiet stretch with barely anything rideable. The swell is tiny, the winds are mostly cross or onshore, and it’s just not happening. There’s a few glassy moments, like Monday morning the 27th and Wednesday morning the 29th, but we’re talking ankle-biters at 2ft to 2ft. The energy is low, mostly under 200, so there’s no push. It’s a tough run, but it’s not unusual for the area – you just gotta be patient.
Now, if you hold out, things finally get interesting. The real bright spot shows up on Wednesday, August 5th. That morning, we’ve got a clean 5ft east swell with a light cross-offshore breeze, and the energy climbs to 313 (moderate). That’s a good sign. But the afternoon is the one to watch – still clean, 5ft east swell, and the energy jumps to 383. That’s the best combo of the whole run. The water temp is about normal for this time of year, so no shocks there.
Thursday the 6th packs a punch with strong energy readings of 928 and 937 – that’s serious power. Swell sits at 6ft to 7ft from the east-northeast, and the wind stays clean and cross-offshore. This is big-wave territory though, strictly for experienced surfers. The period is a bit short (8-9 seconds), so it might be a little lumpy and less lined up.
My pick for the best session is Wednesday afternoon, August 5th at Siriu. East swell at 5ft, clean offshore breeze, solid energy – that’s the one to aim for.
After that, it tails off, but Monday morning, August 10th gives us a sneaky good one: glassy conditions with a 2ft south-southeast swell and a very long period of 13 seconds. The energy is 260 (moderate), and that long period will give it some nice shape and run, especially on a point or reef. Grab a longboard and enjoy it.
Hang in there, the wait’s worth it.
Rusty.
Short Range ForecastMostly dry. Warm (max 23°C on Tue afternoon, min 15°C on Sat night). Wind will be generally light. | Days 5-7 Weather SummaryLight rain (total 5mm), mostly falling on Tue night. Warm (max 23°C on Wed morning, min 16°C on Wed night). Wind will be generally light. | ||||||||||||||||||
Sunday 26 | Monday 27 | Tuesday 28 | Wednesday 29 | Thursday 30 | Friday 31 | ||||||||||||||
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) | SSE 13 | SSE 12 | S 12 | S 11 | ESE 8 | ESE 8 | ESE 8 | NNE 6 | S 12 | S 11 | S 11 | S 11 | S 10 | S 9 | S 10 | S 9 | S 7 | NE 7 | S 10 |
Wave Graph  | |||||||||||||||||||
 kJ | 286 | 192 | 132 | 86 | 77 | 75 | 58 | 114 | 71 | 91 | 88 | 82 | 71 | 61 | 50 | 44 | 43 | 50 | 108 |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross | cross-on | cross | glassy | cross-on | cross | cross | cross-on | glassy | glassy | cross-on | cross-off | cross-off | glassy | cross | cross | cross-on | cross |
High Tide | 11:42PM0.51m | 1:28PM0.70m | 00:20AM0.56m | 1:51PM0.73m | 00:51AM0.62m | 2:14PM0.74m | 1:20AM0.68m | 2:36PM0.75m | 1:49AM0.73m | 2:59PM0.74m | 2:19AM0.76m | 3:23PM0.73m | 2:51AM0.78m | ||||||
Low Tide | 6:23AM0.12m | 7:27PM0.33m | 7:04AM0.07m | 7:55PM0.31m | 7:42AM0.02m | 8:22PM0.30m | 8:17AM-0.01m | 8:48PM0.30m | 8:52AM-0.02m | 9:16PM0.30m | 9:28AM-0.01m | 9:47PM0.30m | |||||||
 |  |  | | | | | | |  | | | |  |  |  | | | | |
 | — | 7:00 | — | — | 6:58 | — | — | 6:58 | — | — | 6:58 | — | — | 6:58 | — | — | 6:56 | — | — |
 | — | — | 5:40 | — | — | 5:42 | — | — | 5:43 | — | — | 5:43 | — | — | 5:44 | — | — | 5:44 | — |
mm | — | — | — | — | — | — | — | — | — | 1 | — | — | 1 | 1 | 2 | — | — | — | — |
Temp °C | 16 | 22 | 22 | 19 | 22 | 22 | 20 | 22 | 23 | 19 | 23 | 23 | 18 | 16 | 16 | 17 | 21 | 21 | 18 |
Feels °C | 17 | 21 | 20 | 19 | 23 | 22 | 20 | 23 | 24 | 21 | 25 | 24 | 17 | 15 | 16 | 17 | 20 | 19 | 17 |
Swell 1 Height (m) Direction Period (s) | ESE 8 | ESE 8 | ESE 8 | ESE 8 | ESE 8 | ESE 8 | ESE 8 | NE 6 | ENE 6 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | S 7 | S 6 | S 10 |
| kJ | 235 | 165 | 114 | 86 | 76 | 75 | 58 | 54 | 67 | 56 | 57 | 51 | 53 | 40 | 42 | 29 | 43 | 28 | 108 |
Swell 2 Height (m) Direction Period (s) | SSE 13 | SSE 12 | S 12 | S 11 | S 12 | S 12 | SSE 11 | ESE 8 | ESE 8 | S 11 | S 11 | S 11 | S 10 | S 9 | S 10 | S 9 | ENE 7 | SSE 12 | ENE 8 |
| kJ | 286 | 192 | 132 | 86 | 77 | 70 | 42 | 35 | 23 | 91 | 88 | 82 | 71 | 61 | 50 | 44 | 27 | 44 | 22 |
Swell 3 Height (m) Direction Period (s) | ENE 8 | ENE 8 | ENE 7 | ENE 7 | NE 5 | NE 5 | SSE 14 | S 13 | S 12 | ESE 8 | ESE 8 | ESE 8 | S 3 | ESE 8 | ESE 8 | SSW 6 | S 9 | S 8 | ESE 6 |
| kJ | 20 | 20 | 11 | 11 | 11 | 12 | 21 | 84 | 71 | 24 | 24 | 12 | 4 | 6 | 6 | 11 | 23 | 10 | 6 |
Wind waves Height (m) Direction Period (s) | — | N 3 | NE 4 | NE 5 | — | NE 5 | NE 5 | NNE 6 | — | — | NNW 3 | — | SSW 4 | S 4 | S 6 | — | — | NE 7 | NE 4 |
| kJ | — | 4 | 12 | 22 | — | 19 | 26 | 114 | — | — | 3 | — | 10 | 10 | 22 | — | — | 50 | 32 |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 0 | 6 | 16 | 6 | 0 | 27 | 34 | 6 | 15 | 0 | 0 | 27 | 21 | 0 | 0 | 6 | 9 | 27 | 39 |
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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