
Surf Forecasts:
Siriu surf forecast from 23 Jul 2026:
- Best quality surf: Thursday 23 Jul, 9PM (local time) - 7ft (2.1m), 8s period, S swell with cross-offshore winds.
- Most powerful swell: Thursday 23 Jul, 9PM (local time) - 7ft (2.1m), 8s period, S swell with 630 kJ wave energy.
- Next surfable swell (1★+): Thursday 23 Jul, 3AM (local time) - 3.5ft (1.1m), 9s 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 Thursday (Jul 23) at 3AM. The primary swell is predicted to be 1.1m and 9s period with a secondary swell of 0.5m and 7s. The wind is predicted to be glassy as the swell arrives.
The most powerful waves expected at Siriu in the next 16 days are 2.1m 8s and forecast to arrive on Thursday (Jul 23) 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 2.3m 8s period and expected on Thursday (Jul 23) at 6PM.
| Wave Type | Time (-03) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 3AM (Thu 23rd Jul) | 3.5ft (1.1m) 9s |
| Best Surf | 9PM (Thu 23rd Jul) | 7ft (2.1m) 8s |
| Most Powerful | 9PM (Thu 23rd Jul) | 7ft (2.1m) 8s |
Table - best surf conditions forecast for Siriu over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let’s have a look at what’s cooking at Siriu over the next couple of weeks.
First up, the water temp is sitting about average for this time of year, so no shocks there. The early part of the run is a bit of a slow starter, but there’s a real good pulse of energy building for the second week that’s got my attention.
Thursday the 23rd morning kicks things off with a clean 3ft swell from the ENE, period at 8 seconds, and a light cross-off breeze. The combined energy is moderate (214). It’s not pumping, but it’s a fun little beginner-friendly wave. The afternoon turns a bit messy with stronger wind, so the morning is the move.
Friday the 24th morning sees a bump up to 5ft from the SSE, still with a light cross-off, and the energy is moderate (365). It’s a bit more push, but nothing crazy. The afternoon gets a cross shore wind, making it a little bumpy.
Now, Saturday the 25th morning is the real standout of the first week. We’ve got glassy conditions, not a breath of wind, with a 5ft SE swell and an 8-second period. The energy is moderate (380). That’s clean, fun, and perfect for a long session. This is the pick of the early days.
Sunday the 26th drops off a bit, with a smaller 3ft SSE swell but a longer 12-second period. The energy is still moderate (397). The wind goes cross shore, so it’s a bit more tricky. The rest of the week through to the 31st is mostly small, weak, and inconsistent, with energy dropping to as low as 83. There’s a few glassy moments, like Tuesday the 28th afternoon and Wednesday the 29th morning, but the swell is tiny (1ft to 2ft). It’s a real flat spell.
Then we get a gap with no real recommendations until the 1st of August. Saturday the 1st morning brings a 5ft ENE swell at 7 seconds, with a clean cross-off wind and moderate energy (218). It’s a slight uptick, but the real magic shows up on Sunday the 2nd afternoon. The swell jumps to 8ft from the S with a 10-second period, and it’s glassy. The combined energy rockets to 2243 (strong). That’s big, powerful, and clean. This one is for experienced surfers only – it’s too big for beginners.
Monday the 3rd and Tuesday the 4th keep the size going with big, long-period SSE and SE swells (13-14 seconds), with energy in the thousands (1519 and 1139). The wind stays cross-off, so it’s clean, but again, these are expert-only waves at 6ft to 7ft. The long period (over 15 seconds isn’t here, but 13-14 seconds is still a proper groundswell) will make the waves more powerful and better shaped, but it’ll also mean longer lulls between sets.
The run tapers off after the 4th, with the swell dropping and the wind getting messy through to the 7th. The 7th of August morning does offer a clean, small 3ft ENE swell, but the energy is moderate (333).
So, the best on offer? Without a doubt, the Saturday 25th morning for the clean, glassy, fun-sized waves, and the Sunday 2nd afternoon for the big, powerful, clean groundswell for the experts. The energy at the end of the first week is weak, but the second week really delivers. Keep an eye on that window.
Rusty.
Short Range ForecastLight rain (total 2mm), mostly falling on Thu night. Warm (max 20°C on Sat morning, min 16°C on Wed night). Wind will be generally light. | Days 5-7 Weather SummaryModerate rain (total 14mm), heaviest on Sun night. Warm (max 24°C on Mon afternoon, min 16°C on Sat night). Wind will be generally light. | ||||||||||||||||||
Thursday 23 | Friday 24 | Saturday 25 | Sunday 26 | Monday 27 | Tuesday 28 | ||||||||||||||
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 | S 8 | S 8 | SSE 8 | SSE 8 | SE 8 | SE 8 | SE 9 | SE 9 | SSE 12 | S 12 | ESE 8 | S 12 | S 12 | S 12 | ESE 8 | ESE 8 | ESE 8 |
Wave Graph | |||||||||||||||||||
189 | 125 | 266 | 513 | 306 | 261 | 311 | 313 | 304 | 303 | 192 | 135 | 117 | 110 | 103 | 67 | 64 | 62 | 46 | |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross-off | cross-off | cross-off | cross-off | cross | glassy | glassy | cross-on | cross-off | cross | cross-on | cross | cross | cross-on | cross-off | cross | glassy | cross |
High Tide | 12:23PM0.53m | 7:29PM0.46m | 12:44PM0.60m | 10:32PM0.46m | 1:06PM0.65m | 11:42PM0.51m | 1:28PM0.70m | 00:20AM0.56m | 1:51PM0.73m | 00:51AM0.62m | 2:14PM0.74m | 1:20AM0.68m | |||||||
Low Tide | 3:12AM0.30m | 4:48PM0.43m | 4:31AM0.24m | 6:10PM0.40m | 5:33AM0.18m | 6:55PM0.36m | 6:23AM0.12m | 7:27PM0.33m | 7:04AM0.07m | 7:55PM0.31m | 7:42AM0.02m | 8:22PM0.30m | |||||||
— | 7:01 | — | — | 7:01 | — | — | 7:00 | — | — | 7:00 | — | — | 6:58 | — | — | 6:58 | — | — | |
— | — | 5:39 | — | — | 5:39 | — | — | 5:40 | — | — | 5:40 | — | — | 5:42 | — | — | 5:43 | — | |
mm | — | — | — | 2 | — | — | — | — | — | — | — | 2 | 3 | — | — | 5 | 3 | 1 | 4 |
Temp °C | 17 | 19 | 17 | 16 | 18 | 19 | 17 | 20 | 20 | 17 | 22 | 22 | 18 | 23 | 24 | 19 | 20 | 21 | 20 |
Feels °C | 18 | 15 | 13 | 14 | 18 | 19 | 17 | 20 | 19 | 18 | 21 | 20 | 19 | 24 | 23 | 20 | 21 | 24 | 22 |
Swell 1 Height (m) Direction Period (s) | ENE 9 | ENE 8 | ENE 8 | SSE 8 | SSE 8 | SSE 8 | SE 8 | SE 8 | SE 9 | SE 9 | SE 8 | SE 8 | ESE 8 | ESE 8 | ESE 8 | NE 5 | ESE 8 | ENE 6 | ENE 7 |
189 | 125 | 96 | 376 | 306 | 261 | 311 | 313 | 304 | 281 | 184 | 135 | 117 | 86 | 76 | 28 | 64 | 37 | 34 | |
Swell 2 Height (m) Direction Period (s) | S 8 | S 8 | — | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | SSE 13 | SSE 13 | SSE 12 | S 12 | S 11 | S 12 | S 12 | ESE 8 | ENE 6 | ESE 8 | ESE 8 |
29 | 84 | — | 72 | 51 | 47 | 45 | 32 | 95 | 303 | 192 | 132 | 85 | 110 | 103 | 64 | 34 | 62 | 46 | |
Swell 3 Height (m) Direction Period (s) | S 4 | NNE 5 | — | — | S 10 | S 10 | S 9 | SSE 13 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | SSE 14 | NE 4 | ENE 7 | S 12 | SSE 12 | SSE 12 | SSE 11 |
1 | 5 | — | — | 8 | 8 | 42 | 35 | 32 | 19 | 19 | 19 | 37 | 12 | 9 | 67 | 47 | 44 | 41 | |
Wind waves Height (m) Direction Period (s) | SSW 4 | — | S 8 | S 8 | — | — | — | — | S 9 | — | N 3 | NE 4 | NE 4 | NNE 4 | NE 5 | NNW 4 | — | — | — |
2 | — | 266 | 513 | — | — | — | — | 39 | — | 2 | 14 | 11 | 25 | 14 | 5 | — | — | — | |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 0 | 0 | 10 | 0 | 0 | 10 | 0 | 0 | 13 | 0 | 6 | 16 | 9 | 6 | 27 | 0 | 6 | 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.










