
Surf Forecasts:
Siriu surf forecast from 25 Jul 2026:
- Best quality surf: Thursday 30 Jul, 6PM (local time) - 6.5ft (2.0m), 8s period, S swell with cross-offshore winds.
- Most powerful swell: Thursday 30 Jul, 6PM (local time) - 6.5ft (2.0m), 8s period, S swell with 463 kJ wave energy.
- Next surfable swell (1★+): Saturday 25 Jul, 6AM (local time) - 4.5ft (1.4m), 9s period with SE 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 (Jul 25) at 6AM. The primary swell is predicted to be 1.4m and 9s period with a secondary swell of 0.5m and 8s. 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 2.0m 8s and forecast to arrive on Thursday (Jul 30) at 6PM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.8m 4s period and expected on Wednesday (Jul 29) at 12PM.
| Wave Type | Time (-03) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 6AM (Sat 25th Jul) | 4.5ft (1.4m) 9s |
| Best Surf | 6PM (Thu 30th Jul) | 6.5ft (2.0m) 8s |
| Most Powerful | 6PM (Thu 30th Jul) | 6.5ft (2.0m) 8s |
Table - best surf conditions forecast for Siriu over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let’s talk about what’s on the menu for Siriu over the next couple of weeks.
First up, the outlook is a bit of a mixed bag, but there are a couple of sessions that are proper standouts. The water temp is about average for this time of year, so no need to dig out the extra thick wetsuit just yet.
Saturday 25 July kicks things off with a clean, glassy morning. The swell is a solid 4.6 ft from the SE with a period of 9 seconds, pumping in a moderate amount of energy (372). That offshore wind and glassy conditions are going to make it a real treat for a beginner-friendly wave. The wind switches onshore in the afternoon, so the morning is the clear winner here.
Sunday 26 July is a write-off. Strong cross and cross-onshore winds chop up the dropping swell. Not worth paddling out.
Monday 27 July is a bit of a recovery day. The morning is glassy again with a small, clean 1.6 ft swell from the S (12-second period, 161 energy). It’s surfable, but very ordinary. The afternoon gets a bit messy with cross-onshore wind.
Tuesday 28 July is another morning glass-off. The swell bumps up to 4.6 ft from the NNE, but it’s a short-period 6-second windswell (267 energy). It’ll be fun for a frolic, but don’t expect any world-class barrels.
Wednesday 29 July has a risk of thunderstorms in the afternoon, but the morning is glassy again with a 3.6 ft NE swell (7-second period, 231 energy). The afternoon glass-off could be a sneaky good session.
Thursday 30 July is a day for the brave. The morning has clean surf with a 3.0 ft swell from the S (10-second period, 211 energy) and a cross-offshore wind, but it’s blowing 15 mph. The afternoon sees the swell jump to 5.9 ft from the S, but it’s choppy. Not ideal.
Friday 31 July is a glassy morning again with a 3.0 ft S swell (8-second period, 200 energy). The wind is dead calm, so it’s a nice, clean session for the beginners.
The first big standout comes on Monday 3 August. The morning is glassy, dead calm, with a 5.9 ft swell from the ESE (8-second period) and a huge jump in energy (772). That’s a proper pulse of moderate wave energy. The wind is offshore, so the conditions will be clean. The afternoon has a bit of cross-onshore wind, but the morning is the one to circle on the calendar. At 5.9 ft, it’s getting a bit big for the total beginners, but it’s still in the fun zone.
Tuesday 4 August gets messy. The swell is 6.9 ft from the ESE, but the wind is a strong 12-15 mph cross-onshore, making it choppy and lumpy. Hard pass.
Wednesday 5 August sees the swell pump up to 7.2-8.2 ft from the ESE (11-second period), with a very strong energy reading (1242-1645). The wind is cross-shore to cross-onshore, and at this size, the period is long and the setup is a beach break. That means it’s going to be big, powerful, and likely closing out in sections. This is for experts only.
Thursday 6 August is more of the same: big, powerful, and messy.
Friday 7 August is another standout, but with a huge caveat. The morning has a glassy, light wind forecast with a monster 9.8 ft swell from the ENE (10-second period, 2543 energy). That is a massive amount of wave energy. The report itself says the swell is predicted to be too big for this break. At 9.8 ft, this is strictly for experts, and even then, it’s a dicey one. The period is moderate, but the sheer size and energy will be intimidating.
Saturday 8 August and Sunday 9 August are still big, with the swell dropping to 8.2 ft and then 5.9 ft. The wind on Sunday morning is a clean cross-offshore from the SSW, with a 5.9 ft E swell (10-second period, 643 energy). That’s a very good session in the making, with clean conditions and a solid, surfable swell.
The pick of the whole forecast: The Monday 3 August morning session is the clear winner for the best all-round conditions. Clean, glassy, a solid 5.9 ft with moderate energy, and not too big for most surfers. The Sunday 9 August morning is the second-best option, with a touch less size but clean, cross-offshore winds.
For the rest of the time, there are a lot of glassy mornings but small, weak swells, and a long stretch of big, windy, messy surf in the middle of the second week. If you’re a beginner, stick to the 25-27 July and 31 July mornings. For the experts, the 5-7 August window is big, but it’s a gamble.
Stay stoked.
Short Range ForecastMostly dry. Warm (max 22°C on Sun morning, min 15°C on Fri night). Wind will be generally light. | Days 5-7 Weather SummaryLight rain (total 2mm), mostly falling on Tue night. Warm (max 24°C on Wed morning, min 16°C on Thu afternoon). Wind will be generally light. | ||||||||||||||||||
Saturday 25 | Sunday 26 | Monday 27 | Tuesday 28 | Wednesday 29 | Thursday 30 | ||||||||||||||
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) | SE 9 | SE 9 | SE 9 | SSE 13 | SSE 12 | S 12 | S 11 | S 12 | S 12 | ESE 8 | NNE 6 | ENE 6 | ENE 7 | ENE 7 | NE 7 | ENE 7 | S 10 | S 8 | S 7 |
Wave Graph | |||||||||||||||||||
290 | 293 | 275 | 286 | 192 | 132 | 86 | 77 | 70 | 51 | 119 | 64 | 65 | 59 | 103 | 43 | 159 | 368 | 209 | |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | glassy | on | cross | cross | cross-on | cross-off | glassy | cross-on | cross | glassy | cross | cross | cross | glassy | cross-off | cross-off | cross | cross-off |
High Tide | 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 | 2:36PM0.75m | 1:49AM0.73m | 2:59PM0.74m | 2:19AM0.76m | ||||||
Low Tide | 5:33AM0.18m | 6:55PM0.36m | 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 | |||||||
— | 7:00 | — | — | 7:00 | — | — | 6:58 | — | — | 6:58 | — | — | 6:58 | — | — | 6:58 | — | — | |
— | — | 5:40 | — | — | 5:40 | — | — | 5:42 | — | — | 5:43 | — | — | 5:43 | — | — | 5:44 | — | |
mm | — | — | — | — | — | — | — | — | — | — | — | — | 1 | — | 1 | — | — | — | — |
Temp °C | 16 | 19 | 19 | 16 | 22 | 22 | 18 | 21 | 21 | 19 | 23 | 23 | 20 | 24 | 23 | 19 | 18 | 18 | 16 |
Feels °C | 16 | 19 | 18 | 16 | 19 | 20 | 17 | 21 | 20 | 19 | 23 | 24 | 20 | 26 | 25 | 18 | 16 | 15 | 15 |
Swell 1 Height (m) Direction Period (s) | SE 9 | SE 9 | SE 9 | ESE 8 | ESE 8 | ESE 8 | ESE 8 | ESE 8 | ESE 8 | ESE 8 | NE 6 | ENE 6 | ENE 7 | ENE 7 | NE 7 | ENE 7 | ENE 7 | ENE 7 | S 7 |
290 | 293 | 275 | 235 | 143 | 105 | 75 | 56 | 55 | 51 | 58 | 64 | 51 | 59 | 65 | 40 | 40 | 30 | 183 | |
Swell 2 Height (m) Direction Period (s) | ENE 8 | ENE 8 | SSE 13 | SSE 13 | SSE 12 | S 12 | NE 5 | S 12 | S 12 | SSE 11 | ESE 8 | ESE 8 | S 11 | S 11 | S 10 | S 9 | ESE 8 | ESE 8 | ENE 7 |
34 | 33 | 125 | 286 | 192 | 132 | 19 | 77 | 70 | 42 | 35 | 34 | 65 | 57 | 51 | 27 | 12 | 6 | 20 | |
Swell 3 Height (m) Direction Period (s) | S 10 | S 10 | E 8 | ENE 8 | ENE 8 | ENE 8 | S 11 | NE 5 | NE 5 | SSE 14 | SSE 13 | SSE 12 | ESE 8 | ESE 8 | ESE 8 | SSE 11 | — | — | SSE 13 |
29 | 46 | 31 | 20 | 20 | 11 | 86 | 11 | 8 | 21 | 55 | 47 | 26 | 25 | 12 | 43 | — | — | 17 | |
Wind waves Height (m) Direction Period (s) | — | — | — | — | NNE 3 | NNE 4 | N 5 | NE 5 | — | NE 5 | NNE 6 | — | — | N 4 | NE 7 | SW 2 | S 10 | S 8 | S 7 |
— | — | — | — | 3 | 29 | 34 | 17 | — | 26 | 119 | — | — | 9 | 103 | 1 | 159 | 368 | 209 | |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 0 | 0 | 16 | 6 | 18 | 27 | 0 | 0 | 27 | 9 | 0 | 10 | 6 | 6 | 0 | 21 | 15 | 38 | 0 |
Best forecast wave conditions in Santa Catarina - Sul | |||||||||||||||||||
Best forecast wave conditions in Brazil | |||||||||||||||||||
Header Global | |||||||||||||||||||
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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.










