Surf Forecasts:
Siriu surf forecast from 22 Aug 2026:
- Best quality surf: Saturday 22 Aug, 6AM (local time) - 8ft (2.5m), 10s period, S swell with cross-offshore winds.
- Most powerful swell: Monday 24 Aug, 9AM (local time) - 8ft (2.5m), 14s period, SSE swell with 2,840 kJ wave energy.
- Next surfable swell (1★+): Saturday 22 Aug, 6AM (local time) - 8ft (2.5m), 10s period with S 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 (Aug 22) at 6AM. The primary swell is predicted to be 2.5m and 10s period with a secondary swell of 2.1m and 10s. Another secondary swell of 0.5m and 8s 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 2.5m 14s and forecast to arrive on Monday (Aug 24) at 9AM. Winds are predicted to be glassy at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.2m 5s period and expected on Friday (Aug 28) at 6AM.
| Wave Type | Time (-03) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 6AM (Sat 22nd Aug) | 8ft (2.5m) 10s |
| Best Surf | 6AM (Sat 22nd Aug) | 8ft (2.5m) 10s |
| Most Powerful | 9AM (Mon 24th Aug) | 8ft (2.5m) 14s |
Table - best surf conditions forecast for Siriu over the next 16 days.
The Lowdown
Alright, folks, Rusty here with a look at the next couple of weeks for Siriu. We’ve got a few gems scattered in there, but you’ll need to work for them. The forecast shows a run of poor, choppy conditions through the end of August, so pick your windows carefully.
The absolute standout is Monday morning, 24 August. We’ve got 8ft of southerly groundswell with a very long 15-second period, and the combined swell energy is a massive 3135. The wind is glassy, making it a full-on, top-tier session for experienced surfers only. That’s the one to circle on your calendar. The swell is coming from the SSE, not the optimum E, but the period is so long it’ll still set up well for the point.
The next morning, Tuesday 25 August, is almost as good but a bit lighter. There’s 6ft of SSE swell at 13 seconds, 1009 energy, and again, glassy wind. This one’s more user-friendly and still prime.
If you can wait a full week, there’s an early-morning call on Thursday, 3 September, with 7ft of S groundswell at 13 seconds, 1456 energy, and glassy wind again. That’s more than a week out, so treat it as a promising long-range look, not a guarantee. The setup is right, though.
Outside of those windows, it’s a rough patch. From the afternoon of 25 August through the end of the month, onshore and cross-shore winds from the NNE and NE dominate. Swell drops to 3-5ft, but the chop and lump make it a write-off. By the weekend of 30-31 August, the combined swell energy sinks under 500 and it’s barely worth a look.
One quiet bright spot: Wednesday afternoon, 2 September. Small 4ft southerly swell, 10-second period, but the wind goes cross-off and light, energy at 507. It’s clean but tiny. For a relaxed, uncrowded paddle it’s fine, but don’t expect fireworks.
So, the first week gives you two great mornings – Monday 24 and Tuesday 25. After that, you’re waiting until Thursday 3 September for the next real chance. Stay on it.
Rusty.
Short Range ForecastMostly dry. Very mild (max 14°C on Sat morning, min 10°C on Sat night). Wind will be generally light. | Days 4-6 Weather SummarySome drizzle, heaviest during Thu night. Warm (max 24°C on Thu morning, min 14°C on Tue morning). Winds increasing (calm on Tue morning, fresh winds from the NNE by Thu afternoon). | ||||||||||||||||||||
Saturday 22 | Sunday 23 | Monday 24 | Tuesday 25 | Wednesday 26 | Thursday 27 | Friday 28 | |||||||||||||||
AM | PM | 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) | S 10 | S 10 | S 10 | S 11 | S 12 | SSE 13 | SSE 14 | SSE 14 | SSE 13 | SSE 13 | SSE 12 | SE 16 | SSE 15 | SSE 14 | SSE 14 | SSE 13 | SSE 13 | SSE 12 | ENE 8 | ENE 8 | E 9 |
Wave Graph  | |||||||||||||||||||||
 kJ | 1277 | 952 | 586 | 733 | 1214 | 2553 | 2840 | 2318 | 1377 | 1009 | 838 | 1014 | 2198 | 1604 | 1176 | 680 | 451 | 255 | 226 | 244 | 347 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross | cross-off | cross-off | cross-on | cross-off | glassy | cross-on | cross-off | glassy | cross-on | cross | cross | cross | cross | cross | cross-on | cross | cross | cross-off | cross |
High Tide | 12:43PM0.63m | 11:30PM0.44m | 12:57PM0.68m | 11:53PM0.52m | 1:15PM0.72m | 00:17AM0.60m | 1:34PM0.75m | 00:41AM0.67m | 1:53PM0.77m | 1:06AM0.73m | 2:12PM0.77m | 1:33AM0.78m | 2:31PM0.76m | 2:02AM0.81m | |||||||
Low Tide | 6:30PM0.40m | 5:20AM0.18m | 6:39PM0.35m | 6:07AM0.11m | 7:01PM0.31m | 6:46AM0.04m | 7:25PM0.28m | 7:21AM-0.01m | 7:51PM0.26m | 7:55AM-0.04m | 8:17PM0.25m | 8:29AM-0.04m | 8:45PM0.24m | ||||||||
 | |  | | | | |  |  | | | | |  | | | |  |  |  | | |
 | 6:39 | — | — | 6:37 | — | — | 6:37 | — | — | 6:35 | — | — | 6:35 | — | — | 6:33 | — | — | 6:33 | — | — |
 | — | 5:54 | — | — | 5:55 | — | — | 5:55 | — | — | 5:57 | — | — | 5:57 | — | — | 5:58 | — | — | 5:58 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 1 | 1 | 2 | 2 |
Temp °C | 14 | 13 | 11 | 14 | 14 | 11 | 14 | 14 | 13 | 17 | 18 | 15 | 18 | 18 | 17 | 24 | 24 | 20 | 22 | 20 | 19 |
Feels °C | 10 | 9 | 9 | 11 | 11 | 7 | 12 | 12 | 11 | 15 | 15 | 13 | 16 | 16 | 15 | 21 | 21 | 17 | 23 | 20 | 22 |
Swell 1 Height (m) Direction Period (s) | S 10 | S 10 | S 10 | S 11 | S 12 | SSE 13 | SSE 14 | SSE 14 | SSE 13 | SSE 13 | SSE 12 | SSE 12 | SSE 15 | SSE 14 | SSE 14 | SSE 13 | SSE 13 | ENE 7 | ENE 8 | ENE 8 | E 9 |
| kJ | 821 | 660 | 586 | 733 | 1214 | 2553 | 2840 | 2318 | 1377 | 1009 | 838 | 593 | 2198 | 1604 | 1176 | 680 | 451 | 147 | 226 | 244 | 347 |
Swell 2 Height (m) Direction Period (s) | ENE 8 | ENE 9 | ENE 8 | NE 8 | ENE 8 | ENE 7 | — | — | — | — | — | SE 16 | — | — | — | ENE 7 | — | SSE 12 | SSE 12 | SSE 11 | SSE 11 |
| kJ | 40 | 44 | 28 | 16 | 6 | 5 | — | — | — | — | — | 1014 | — | — | — | 116 | — | 255 | 121 | 81 | 44 |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | S 10 | S 10 | — | — | — | — | — | — | — | — | NE 3 | NNE 3 | NNE 4 | NE 4 | NE 6 | NE 7 | NE 7 | N 4 | NNW 5 | — | — |
| kJ | 1277 | 952 | — | — | — | — | — | — | — | — | 6 | 9 | 16 | 20 | 106 | 195 | 178 | 10 | 19 | — | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 13 | 13 | 38 | 0 | 0 | 13 | 6 | 0 | 38 | 0 | 0 | 27 | 9 | 20 | 20 | 9 | 27 | 101 | 49 | 0 | 0 |
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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