Surf Forecasts:
Siriu surf forecast from 12 Jul 2026:
- Best quality surf: Monday 13 Jul, 6AM (local time) - 7.5ft (2.3m), 8s period, S swell with cross-offshore winds.
- Most powerful swell: Monday 13 Jul, 3AM (local time) - 8ft (2.4m), 8s period, S swell with 765 kJ wave energy.
- Next surfable swell (1★+): Monday 13 Jul, 6AM (local time) - 7.5ft (2.3m), 8s 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 13) at 6AM. The primary swell is predicted to be 2.3m and 8s period with a secondary swell of 1.9m and 8s. Another secondary swell of 0.7m 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 8s and forecast to arrive on Monday (Jul 13) at 3AM. Winds are predicted to be cross-offshore at the time the swell arrives.
| Wave Type | Time (-03) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 6AM (Mon 13th Jul) | 7.5ft (2.3m) 8s |
| Best Surf | 6AM (Mon 13th Jul) | 7.5ft (2.3m) 8s |
| Most Powerful | 3AM (Mon 13th Jul) | 8ft (2.4m) 8s |
Table - best surf conditions forecast for Siriu over the next 16 days.
Alright, Rusty here, switching to boots and inches.
The water is a frigid 60°, which is about 7° colder than usual for this time of year. You’re gonna need a thick suit.
The next couple of days are a bust. Sunday afternoon has 30 km/h cross-shore wind and a messy, lumpy sea. Monday the 13th morning shows a 7ft S swell, but it’s a short-period 8-second wind swell, with moderate energy (1159). It’s clean with cross-offshore wind, but that’s for experienced surfers only.
The best bet of the first week is Tuesday morning, the 14th. The wind drops to glassy, and you get a 6ft SE swell with a 10-second period. The energy is moderate (545), but the glassy conditions will make the waves clean and lined up. That’s the session to aim for.
From Wednesday the 15th through the 24th, it’s mostly poor. Winds are cross or cross-onshore, the swell is small, and the surf is weak. There’s a tiny window on Tuesday the 21st afternoon with glassy wind and a 3ft ENE swell, but the energy is weak (226) and the waves are small.
Now for the second week. Friday the 25th morning brings a solid 8ft S swell (10 seconds) with strong energy (1810) and clean cross-offshore wind. That’s a powerful wave for experts only. The 26th is even bigger: 8ft SSE swell with a long 14-15 second period, and energy readings are huge (2799–3234). The wind is clean and offshore.
Then Monday the 27th morning, it’s a massive 10ft SSE swell with a very long 16-second period, and the energy is overwhelming (3955). The wind is glassy. But that’s too big for this spot. It’s a chargers-only zone, and even then, it’s a maybe.
If you’re looking for the best wave, paddle out on Tuesday the 14th morning for glassy 6ft SE groundswell. For the second week, circle the 25th and 26th for powerful, clean S to SSE swells, but be aware the 26th is big. Crowds are only sometimes a problem, so you might score some empty waves.
Rusty.
Short Range ForecastMostly dry. Very mild (max 19°C on Wed morning, min 11°C on Sun night). Winds decreasing (fresh winds from the S on Sun afternoon, calm by Tue morning). | Days 5-7 Weather SummaryMostly dry. Warm (max 25°C on Sat morning, min 14°C on Wed night). Mainly fresh winds. | ||||||||||||||||||||
Sun 12 | Monday 13 | Tuesday 14 | Wednesday 15 | Thursday 16 | Friday 17 | Saturday 18 | |||||||||||||||
PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | |
Swell Height Map |  |  |  |  |  |  |  |  | |||||||||||||
Wave Height (m) Direction Period (s) | ESE 12 | S 8 | S 8 | S 8 | SSE 10 | SE 10 | SE 10 | ESE 10 | ESE 10 | ESE 10 | ESE 11 | ESE 11 | ESE 11 | ESE 11 | NE 8 | ENE 8 | NE 8 | NE 8 | ENE 8 | NE 8 | ENE 8 |
Wave Graph  | |||||||||||||||||||||
 kJ | 309 | 674 | 612 | 310 | 394 | 542 | 546 | 500 | 540 | 360 | 334 | 247 | 226 | 211 | 447 | 326 | 519 | 560 | 323 | 560 | 277 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross-off | cross-off | cross | off | glassy | cross-on | cross | cross | cross | cross | cross | cross-on | cross | cross | cross-on | cross | cross | cross-on | cross | cross |
High Tide | 00:49AM0.50m | 3:00PM0.82m | 1:07AM0.55m | 3:36PM0.78m | 1:33AM0.61m | 3:55PM0.72m | 2:04AM0.67m | 4:01PM0.65m | 2:38AM0.72m | 4:11PM0.60m | 3:15AM0.73m | 4:27PM0.56m | 9:16PM0.43m | 3:55AM0.71m | |||||||
Low Tide | 8:25PM0.29m | 7:48AM0.00m | 9:05PM0.33m | 8:33AM-0.04m | 9:39PM0.39m | 9:15AM-0.05m | 10:07PM0.43m | 9:56AM-0.02m | 10:30PM0.46m | 10:35AM0.03m | 10:48PM0.45m | 11:12AM0.11m | 8:49PM0.43m | 11:48AM0.20m | |||||||
 |  | | |  |  |  | | | | | | | | | | | | | | | |
 | — | — | 7:05 | — | — | 7:05 | — | — | 7:03 | — | — | 7:03 | — | — | 7:03 | — | — | 7:03 | — | — | 7:03 |
 | 5:34 | — | — | 5:35 | — | — | 5:35 | — | — | 5:36 | — | — | 5:36 | — | — | 5:37 | — | — | 5:37 | — | 5:37 |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 17 | 15 | 15 | 16 | 13 | 17 | 18 | 15 | 19 | 19 | 15 | 20 | 21 | 17 | 23 | 24 | 19 | 25 | 25 | 21 | 28 |
Feels °C | 12 | 11 | 11 | 12 | 11 | 16 | 16 | 13 | 15 | 15 | 12 | 16 | 17 | 13 | 20 | 21 | 17 | 22 | 22 | 19 | 25 |
Swell 1 Height (m) Direction Period (s) | ESE 12 | S 8 | S 8 | SSE 8 | SSE 10 | SE 10 | SE 10 | ESE 10 | ESE 10 | ESE 10 | ESE 11 | ESE 11 | ESE 11 | ESE 11 | ENE 8 | ESE 10 | ENE 8 | ENE 8 | ESE 10 | ENE 8 | ENE 8 |
| kJ | 309 | 397 | 403 | 264 | 394 | 542 | 546 | 500 | 540 | 360 | 334 | 247 | 226 | 193 | 267 | 92 | 331 | 298 | 10 | 379 | 277 |
Swell 2 Height (m) Direction Period (s) | SSE 11 | ESE 12 | ESE 12 | ESE 11 | ESE 11 | E 8 | S 11 | ESE 13 | S 10 | S 10 | S 10 | S 12 | S 12 | S 13 | ESE 10 | SE 16 | ESE 10 | ESE 11 | SSE 13 | S 12 | S 13 |
| kJ | 93 | 226 | 123 | 81 | 84 | 1 | 10 | 90 | 8 | 7 | 2 | 3 | 3 | 3 | 95 | 10 | 58 | 50 | 16 | 3 | 14 |
Swell 3 Height (m) Direction Period (s) | SSE 18 | SSE 16 | SSE 15 | ESE 8 | S 13 | NE 8 | NE 7 | S 11 | ESE 12 | S 14 | S 13 | S 9 | S 12 | — | SE 18 | S 11 | SSE 15 | SSE 13 | S 9 | SE 15 | — |
| kJ | 61 | 25 | 21 | 13 | 51 | 2 | 2 | 9 | 142 | 4 | 3 | 2 | 3 | — | 12 | 3 | 21 | 18 | 2 | 9 | — |
Wind waves Height (m) Direction Period (s) | S 7 | S 8 | S 8 | S 8 | — | — | — | NNE 4 | NE 5 | NE 6 | NE 6 | NE 6 | NE 7 | NE 7 | NE 8 | ENE 8 | NE 8 | NE 8 | ENE 8 | NE 8 | N 5 |
| kJ | 254 | 674 | 612 | 310 | — | — | — | 32 | 83 | 62 | 67 | 108 | 164 | 211 | 447 | 326 | 519 | 560 | 323 | 560 | 41 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 65 | 13 | 0 | 38 | 0 | 0 | 9 | 9 | 33 | 49 | 49 | 49 | 101 | 27 | 27 | 16 | 27 | 20 | 39 | 9 | 9 |
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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