Surf Forecasts:
Siriu surf forecast from 27 Jul 2026:
- Best quality surf: Monday 27 Jul, 6AM (local time) - 2ft (0.6m), 12s period, S swell with glassy winds.
- Most powerful swell: Thursday 30 Jul, 12AM (local time) - 4ft (1.2m), 10s period, S swell with 273 kJ wave energy.
- Next surfable swell (1★+): Monday 27 Jul, 6AM (local time) - 2ft (0.6m), 12s 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 Monday (Jul 27) at 6AM. The primary swell is predicted to be 0.6m and 12s period with a secondary swell of 0.8m and 8s. Another secondary swell of 0.7m and 4s is also forecast. The wind is predicted to be glassy as the swell arrives.
The most powerful waves expected at Siriu in the next 16 days are 1.2m 10s and forecast to arrive on Thursday (Jul 30) 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 0.8m 7s period and expected on Thursday (Jul 30) at 3AM.
| Wave Type | Time (-03) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 6AM (Mon 27th Jul) | 2ft (0.6m) 12s |
| Best Surf | 6AM (Mon 27th Jul) | 2ft (0.6m) 12s |
| Most Powerful | 12AM (Thu 30th Jul) | 4ft (1.2m) 10s |
Table - best surf conditions forecast for Siriu over the next 16 days.
The Lowdown
G’day, Rusty here. Let’s break down what Siriu’s got in store over the next couple weeks.
First half of this run is pretty average – there’s waves but the conditions are all over the shop. The real action shows up in the second week, starting Tuesday the 4th of August, when a proper lump of energy rolls in.
From Monday the 27th through to Sunday the 2nd of August, it’s mostly small, short-period stuff with onshore or side winds making a mess. A few clean moments pop up – like Wednesday morning the 29th with a light cross-off breeze and chest-high S swell, and Thursday morning the 30th with clean 3ft SSE swell – but nothing that’ll get you fired up. The combined energy sits between 143 and 208 (weak to moderate). You’d be hunting hard for a ride.
Then things ramp up. Tuesday the 4th of August is the standout. The morning’s glassy as a mirror with 5ft SSE groundswell (11-second period) and combined energy jumping to 942 (moderate to strong). That’s some real grunt. Wind is dead calm – glassy – so it’ll be clean, lined up, and inviting. Not too big, so beginners can get amongst it too. The optimum swell direction is E, and we’re getting SSE, so it’s not a perfect angle, but with that energy and zero wind, it’s the pick of the fortnight.
Wednesday the 5th sees the swell peak at 7ft from the SE (10-second period), with combined energy at 892 (strong). But the wind swings to a moderate side breeze from the NNE, bringing a cross-chop. That’s expert-only size with bumpy conditions – a handful.
Friday the 7th of August is another ripper. The morning’s clean with a gentle offshore breeze, 6ft SSE swell at 12 seconds, and combined energy of 1126 (strong to very strong). That’s a proper groundswell with long lulls between sets – ideal for the reefs and points around here. The afternoon stays clean but gets breezier with 25 km/h cross-off winds. Still a solid day.
After that, the energy drops off quick through the weekend and into the second week. Saturday the 8th has a small glassy morning, but by Sunday and Monday the 9th and 10th it’s back to tiny, wind-chopped slop with combined energy under 90 (weak). Not worth getting wet for.
If you’re keen, aim for Tuesday the 4th or Friday the 7th of August. The 4th is the real gem – glassy, solid 5ft, and clean as a whistle.
Stay frothy,
Rusty
Short Range ForecastLight rain (total 3mm), mostly falling on Sun night. Warm (max 26°C on Wed morning, min 17°C on Sun night). Wind will be generally light. | Days 5-7 Weather SummarySome drizzle, heaviest during Thu morning. Warm (max 24°C on Sat afternoon, min 16°C on Wed night). Winds increasing (calm on Thu afternoon, fresh winds from the NNE by Sat morning). | ||||||||||||||||||
Monday 27 | Tuesday 28 | Wednesday 29 | Thursday 30 | Friday 31 | Saturday 1 | ||||||||||||||
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) | ESE 8 | S 12 | ESE 8 | ESE 8 | NNE 5 | S 12 | S 11 | S 12 | S 11 | S 10 | SSE 7 | S 10 | S 9 | S 12 | S 11 | S 11 | ENE 7 | NE 7 | NE 7 |
Wave Graph  | |||||||||||||||||||
 kJ | 105 | 108 | 75 | 58 | 103 | 71 | 89 | 137 | 85 | 273 | 60 | 71 | 80 | 75 | 127 | 61 | 114 | 155 | 176 |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | glassy | cross-on | cross | cross | cross | glassy | cross-off | cross | cross-off | cross-off | glassy | cross | cross | cross-on | cross | cross | cross | off |
High Tide | 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 | 3:50PM0.71m | |||||||
Low Tide | 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 | 10:04AM0.02m | 10:20PM0.31m | |||||||
 |  | |  | | | |  | |  |  |  | | | | | | | | |
 | — | 6:58 | — | — | 6:58 | — | — | 6:58 | — | — | 6:58 | — | — | 6:56 | — | — | 6:56 | — | — |
 | — | — | 5:42 | — | — | 5:43 | — | — | 5:43 | — | — | 5:44 | — | — | 5:44 | — | — | 5:45 | — |
mm | 2 | — | — | — | — | — | 1 | — | — | — | 1 | — | — | — | — | — | — | — | — |
Temp °C | 18 | 21 | 20 | 20 | 25 | 24 | 19 | 26 | 21 | 17 | 17 | 17 | 17 | 20 | 21 | 18 | 23 | 24 | 22 |
Feels °C | 18 | 22 | 21 | 19 | 26 | 24 | 20 | 28 | 19 | 14 | 17 | 18 | 17 | 18 | 19 | 16 | 19 | 20 | 21 |
Swell 1 Height (m) Direction Period (s) | ESE 8 | ESE 8 | ESE 8 | ESE 8 | NE 6 | NE 6 | ENE 6 | ENE 7 | ENE 7 | S 10 | SSE 7 | SSE 7 | ENE 7 | ENE 7 | S 11 | ENE 5 | ENE 7 | SSE 10 | ENE 7 |
| kJ | 105 | 76 | 75 | 58 | 43 | 54 | 54 | 56 | 50 | 158 | 60 | 50 | 44 | 28 | 127 | 33 | 114 | 20 | 110 |
Swell 2 Height (m) Direction Period (s) | S 11 | S 12 | S 12 | SSE 11 | ESE 8 | ESE 8 | S 11 | S 12 | S 11 | ENE 7 | ENE 7 | ENE 7 | S 9 | S 9 | SE 7 | S 11 | SSE 11 | SE 7 | S 10 |
| kJ | 86 | 108 | 70 | 42 | 36 | 24 | 89 | 137 | 85 | 36 | 55 | 55 | 80 | 37 | 18 | 61 | 38 | 2 | 8 |
Swell 3 Height (m) Direction Period (s) | ENE 7 | NE 4 | NE 4 | SSE 14 | S 13 | S 12 | ESE 8 | SE 8 | ESE 8 | SSE 12 | SSE 9 | S 10 | SE 8 | S 12 | — | NE 8 | SE 7 | — | E 10 |
| kJ | 11 | 6 | 5 | 21 | 84 | 71 | 24 | 15 | 12 | 15 | 28 | 71 | 51 | 75 | — | 14 | 2 | — | 2 |
Wind waves Height (m) Direction Period (s) | NE 4 | — | NE 4 | NE 4 | NNE 5 | — | — | — | — | S 10 | — | — | — | ENE 4 | NE 5 | N 4 | N 4 | NE 7 | NE 7 |
| kJ | 11 | — | 9 | 16 | 103 | — | — | — | — | 273 | — | — | — | 18 | 51 | 14 | 19 | 155 | 176 |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 6 | 0 | 27 | 9 | 27 | 10 | 0 | 0 | 38 | 0 | 0 | 0 | 6 | 9 | 57 | 48 | 49 | 269 | 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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