
Surf Forecasts:
Siriu surf forecast from 20 Jul 2026:
- Best quality surf: Thursday 23 Jul, 6PM (local time) - 6.5ft (2.0m), 9s period, S swell with cross-offshore winds.
- Most powerful swell: Sunday 26 Jul, 12AM (local time) - 8ft (2.4m), 9s period, SE swell with 926 kJ wave energy.
- Next surfable swell (1★+): Monday 20 Jul, 6AM (local time) - 7ft (2.1m), 8s period with NE 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 20) at 6AM. The primary swell is predicted to be 2.1m and 8s period with a secondary swell of 1.6m and 8s. Another secondary swell of 0.2m and 12s 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 2.4m 9s and forecast to arrive on Sunday (Jul 26) 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 2.0m 8s period and expected on Thursday (Jul 23) at 6AM.
| Wave Type | Time (-03) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 6AM (Mon 20th Jul) | 7ft (2.1m) 8s |
| Best Surf | 6PM (Thu 23rd Jul) | 6.5ft (2.0m) 9s |
| Most Powerful | 12AM (Sun 26th Jul) | 8ft (2.4m) 9s |
Table - best surf conditions forecast for Siriu over the next 16 days.
The Lowdown
Alright, let’s have a proper look, folks. Rusty here.
First up, the next few days aren't offering much for Siriu. The waiting game starts now. The first half of the week sees small, short-period wind swell mostly getting chopped up by cross-shore winds. Not a time to get excited.
The real window opens on Thursday the 23rd of July. The morning brings a solid 7ft swell out of the south, packing a serious punch with a combined swell energy of 1209 – that’s strong stuff. The wind stays light cross-offshore, keeping the surface clean. The period is only 9 seconds, so it’s a mix of ground and wind swell, but at that size you want to be experienced – it’s pushing into expert territory. Afternoon keeps that 7ft south swell humming with 1244 energy, again clean.
Now, the standout? You wanna circle Sunday morning the 27th of July. This is where it comes together. We’ve got a solid 6ft ground swell from the east-southeast, running at 10 seconds. That’s proper period and it’s wrapping in clean. The combined energy is 601 – moderate power, but the wind is just glass. Offshore from the northwest. Dead calm. That’s the one you wait for. The sets will have some push and the lines will hold up. This is the best on offer, no question.
Friday the 24th also deserves a nod. The morning session has 5ft from the southeast with 9-second period and glassy conditions under a light southeast breeze. Clean, manageable, and 461 combined energy. A very good morning for a board.
After the 27th, the quality drops fast. Tuesday the 28th sees the swell drop to 5ft, the period stretches to 11 seconds, but the cross-shore winds from the north-northeast at 16-19 mph make it a mess. Wednesday and Thursday are smaller and onshore or cross-shore. That 2ft to 3ft stuff is barely worth paddling for.
The long-range window on Tuesday morning the 4th of August shows a 2ft, 12-second ground swell from the east – glassy and clean with a light cross-offshore. It’s tiny, but the period is long. A longboard option for the patient few. But the run from the 28th of July right through to the 4th of August is mostly a blank stretch with only that one small highlight.
Summing it up: the first half of the week is a write-off. Thursday the 23rd is big and clean for the crew that can handle it. Friday morning the 24th is solid. But the Sunday morning the 27th is your gold – glassy, chest-to-head-high, with proper east-southeast groundswell. That’s the one to set your alarm for.
Rusty.
Short Range ForecastModerate rain (total 11mm), heaviest on Wed morning. Warm (max 27°C on Tue morning, min 18°C on Tue night). Wind will be generally light. | Days 5-7 Weather SummaryHeavy rain (total 65mm), heaviest during Fri night. Very mild (max 17°C on Wed night, min 16°C on Wed night). Wind will be generally light. | ||||||||||||||||||
Monday 20 | Tuesday 21 | Wednesday 22 | Thursday 23 | Friday 24 | Saturday 25 | ||||||||||||||
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 | ENE 8 | NE 8 | NE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | S 9 | S 9 | SSE 9 | SE 9 | SE 9 | SE 8 | SE 7 | SE 8 | SE 9 |
Wave Graph | |||||||||||||||||||
593 | 264 | 381 | 411 | 192 | 232 | 188 | 176 | 183 | 207 | 668 | 642 | 497 | 380 | 342 | 227 | 199 | 186 | 926 | |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | glassy | glassy | cross | cross | cross-on | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | glassy | glassy | cross-on | cross-on | cross-off | cross-off | cross-off |
High Tide | 4:39AM0.66m | 5:14PM0.53m | 5:30AM0.59m | 5:44PM0.52m | 11:26PM0.35m | 6:39AM0.52m | 6:22PM0.49m | 12:23PM0.53m | 7:29PM0.46m | 12:44PM0.60m | 10:32PM0.46m | 1:06PM0.65m | 11:42PM0.51m | ||||||
Low Tide | 9:02PM0.38m | 12:28PM0.29m | 9:45PM0.35m | 1:28PM0.37m | 10:47PM0.35m | 10:04AM0.46m | 3:00PM0.43m | 3:12AM0.30m | 4:48PM0.43m | 4:31AM0.24m | 6:10PM0.40m | 5:33AM0.18m | 6:55PM0.36m | ||||||
— | 7:03 | — | — | 7:01 | — | — | 7:01 | — | — | 7:01 | — | — | 7:01 | — | — | 7:00 | — | — | |
— | — | 5:37 | — | — | 5:38 | — | — | 5:38 | — | — | 5:39 | — | — | 5:39 | — | — | 5:40 | — | |
mm | — | — | 1 | — | — | — | — | 9 | 1 | 4 | — | — | — | — | 3 | 29 | 17 | 12 | 5 |
Temp °C | 21 | 23 | 22 | 21 | 27 | 26 | 22 | 21 | 21 | 17 | 17 | 17 | 16 | 17 | 16 | 16 | 16 | 16 | 16 |
Feels °C | 19 | 23 | 23 | 19 | 25 | 25 | 23 | 18 | 19 | 16 | 14 | 14 | 15 | 16 | 16 | 15 | 13 | 14 | 14 |
Swell 1 Height (m) Direction Period (s) | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | S 9 | SSE 9 | SSE 9 | SE 9 | SE 9 | SE 8 | SE 7 | SE 8 | SE 9 |
331 | 264 | 264 | 234 | 192 | 232 | 188 | 176 | 183 | 207 | 435 | 499 | 497 | 380 | 342 | 227 | 199 | 186 | 926 | |
Swell 2 Height (m) Direction Period (s) | S 12 | S 12 | S 11 | S 11 | S 10 | S 10 | S 9 | S 8 | S 8 | S 9 | ENE 9 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 7 | SSE 14 |
11 | 10 | 10 | 9 | 18 | 30 | 39 | 33 | 31 | 55 | 106 | 103 | 82 | 72 | 116 | 120 | 66 | 76 | 285 | |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | S 15 | S 3 | — | — | — | — | — | S 11 | S 10 | SSE 10 | S 12 | SSE 12 | — |
— | — | — | — | — | — | 4 | 1 | — | — | — | — | — | 9 | 8 | 33 | 113 | 155 | — | |
Wind waves Height (m) Direction Period (s) | NE 8 | — | NE 8 | NE 8 | — | N 4 | — | — | NNE 4 | SSW 4 | S 9 | S 9 | — | — | ENE 8 | ENE 8 | — | — | — |
593 | — | 381 | 411 | — | 30 | — | — | 28 | 7 | 668 | 642 | — | — | 192 | 191 | — | — | — | |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 9 | 0 | 0 | 6 | 6 | 9 | 0 | 0 | 9 | 71 | 13 | 21 | 0 | 0 | 9 | 9 | 15 | 10 | 10 |
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.










