Surf Forecasts:
Siriu surf forecast from 15 Jul 2026:
- Best quality surf: Tuesday 21 Jul, 6AM (local time) - 5.5ft (1.7m), 8s period, NE swell with cross-offshore winds.
- Most powerful swell: Saturday 18 Jul, 6PM (local time) - 7.5ft (2.3m), 9s period, NE swell with 834 kJ wave energy.
- Next surfable swell (1★+): Sunday 19 Jul, 6AM (local time) - 5.5ft (1.7m), 8s 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 Sunday (Jul 19) at 6AM. The primary swell is predicted to be 1.7m and 8s period with a secondary swell of 0.2m and 14s. Another secondary swell of 1.1m and 5s 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 2.3m 9s and forecast to arrive on Saturday (Jul 18) at 6PM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.6m 3s period and expected on Wednesday (Jul 15) at 6AM.
| Wave Type | Time (-03) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 6AM (Sun 19th Jul) | 5.5ft (1.7m) 8s |
| Best Surf | 6AM (Tue 21st Jul) | 5.5ft (1.7m) 8s |
| Most Powerful | 6PM (Sat 18th Jul) | 7.5ft (2.3m) 9s |
Table - best surf conditions forecast for Siriu over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let’s take a good, hard look at what’s on the table for Siriu over the next couple of weeks.
Honestly, the first week is a bit of a grind. We’ve got waves coming through, but the wind is a stubborn bastard from the north, keeping things choppy and messy most of the time. The swell energy is there, but it’s not doing us any favours with the onshore junk. There’s a gap in proper, clean surf from the start until the morning of Sunday the 19th.
Sunday the 19th is where the whole outlook flips. That morning, the wind swings around to a light cross-offshore from the SSW, and the ocean cleans right up. We’ve got a 5ft swell rolling in from the ENE with a moderate 8-second period, and the combined energy is sitting at 358 (moderate). It’s a proper surf day. The water temp is about average for this time of year, so nothing to worry about there. The afternoon gets even better – the wind drops to a glassy 5 km/h from the SE, and the waves hold at 5ft. This is the standout session of the whole forecast. The waves will be clean, lined up, and a dream for a beginner-friendly spot. The only catch is that crowds are sometimes a thing here, so get out early or late.
Things get a bit patchy again after that, but we get another crack on Tuesday the 21st. The morning goes glassy with a light SSW breeze again, and 4ft ENE swell. It won’t be as punchy as Sunday, but with 289 (weak to moderate) energy, it’s still a clean, fun option for a paddle.
The real sleeper here is the morning of Sunday the 26th. We’re looking at a 6ft SE swell with a short 7-second period, but the wind is a clean cross-offshore from the SW. The combined energy jumps to 830 (moderate-strong), and the forecast is calling for very good surf conditions. This is a solid, powerful option for a Sunday morning session, and it’s deep in the second week so take it as a promising look, not a certainty.
The rest of the fortnight is mostly a write-off with cross-shore wind and lumpy conditions. The swell on the 30th looks big – 8ft – but with a short period and cross-shore wind, it’s more of a messy, powerful beast than a clean wave. Too big for beginners, and the wind won’t make it fun for anyone else.
So, to sum it up: Sunday the 19th is your best bet. Glassy, clean, and fun. Sunday the 26th is the long-range wildcard if you’re feeling lucky.
Rusty.
Short Range ForecastMostly dry. Warm (max 23°C on Fri morning, min 14°C on Tue night). Mainly fresh winds. | Days 5-7 Weather SummaryMostly dry. Warm (max 27°C on Mon afternoon, min 18°C on Fri night). Wind will be generally light. | ||||||||||||||||||||
Wednesday 15 | Thursday 16 | Friday 17 | Saturday 18 | Sunday 19 | Monday 20 | Tue 21 | |||||||||||||||
Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | |
Swell Height Map |  |  |  |  |  |  |  |  | |||||||||||||
Wave Height (m) Direction Period (s) | SE 10 | ESE 10 | ESE 10 | ESE 10 | NNE 6 | ESE 10 | NE 7 | NE 8 | ENE 8 | NE 8 | NE 8 | ENE 8 | NE 9 | ENE 8 | ENE 8 | ENE 9 | ENE 9 | NE 8 | ENE 8 | ENE 8 | ENE 8 |
Wave Graph  | |||||||||||||||||||||
 kJ | 461 | 378 | 251 | 240 | 202 | 163 | 178 | 395 | 334 | 540 | 666 | 500 | 695 | 339 | 306 | 295 | 245 | 330 | 239 | 249 | 249 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross | cross | cross | cross | cross-on | cross | cross | cross-on | cross | cross | cross-on | cross | cross-off | glassy | cross | cross | cross | cross | glassy | cross-on |
High Tide | 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 | 4:49PM0.55m | 4:39AM0.66m | 5:14PM0.53m | 5:30AM0.59m | 5:44PM0.52m | ||||||
Low Tide | 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 | 9:02PM0.38m | 12:28PM0.29m | 9:45PM0.35m | 1:28PM0.37m | |||||||
 |  |  | | | | | | | | | | | | | | | | | | | |
 | — | 7:03 | — | — | 7:03 | — | — | 7:03 | — | — | 7:03 | — | — | 7:03 | — | — | 7:03 | — | — | 7:01 | — |
 | — | — | 5:36 | — | — | 5:36 | — | — | 5:37 | — | — | 5:37 | — | — | 5:37 | — | — | 5:37 | — | — | 5:38 |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 15 | 19 | 19 | 15 | 20 | 21 | 16 | 23 | 23 | 19 | 25 | 25 | 22 | 23 | 21 | 21 | 26 | 27 | 23 | 22 | 24 |
Feels °C | 13 | 15 | 14 | 12 | 16 | 17 | 12 | 20 | 20 | 17 | 21 | 22 | 20 | 24 | 22 | 20 | 23 | 25 | 21 | 24 | 25 |
Swell 1 Height (m) Direction Period (s) | SE 10 | ESE 10 | ESE 10 | ESE 10 | NE 6 | ESE 10 | ESE 10 | ENE 8 | ESE 10 | ENE 8 | ENE 8 | SSE 16 | ENE 9 | ENE 8 | ENE 8 | ENE 9 | ENE 9 | ENE 8 | ENE 8 | ENE 8 | ENE 8 |
| kJ | 461 | 378 | 251 | 240 | 91 | 163 | 118 | 260 | 40 | 339 | 412 | 26 | 426 | 339 | 306 | 295 | 245 | 228 | 239 | 249 | 249 |
Swell 2 Height (m) Direction Period (s) | S 11 | S 10 | S 10 | S 13 | ESE 10 | SE 11 | S 20 | ESE 10 | SSE 16 | ESE 10 | SSE 13 | S 13 | SSE 15 | SSE 13 | SSE 13 | S 12 | S 11 | S 11 | S 10 | S 9 | S 9 |
| kJ | 9 | 8 | 2 | 3 | 163 | 18 | 7 | 67 | 26 | 40 | 17 | 3 | 21 | 17 | 16 | 11 | 9 | 9 | 8 | 15 | 14 |
Swell 3 Height (m) Direction Period (s) | E 7 | S 10 | S 14 | S 13 | S 13 | S 12 | S 13 | SE 18 | S 12 | SSE 15 | S 10 | S 10 | E 9 | E 9 | — | — | — | — | S 6 | S 13 | S 12 |
| kJ | 1 | 18 | 4 | 3 | 3 | 3 | 3 | 12 | 3 | 21 | 2 | 2 | 2 | 2 | — | — | — | — | 1 | 3 | 3 |
Wind waves Height (m) Direction Period (s) | NNW 2 | NNE 4 | NE 5 | NE 6 | NNE 6 | NE 7 | NE 7 | NE 8 | ENE 8 | NE 8 | NE 8 | ENE 8 | NE 9 | — | — | — | — | NE 8 | — | N 4 | N 4 |
| kJ | 1 | 24 | 43 | 72 | 202 | 128 | 178 | 395 | 334 | 540 | 666 | 500 | 695 | — | — | — | — | 330 | — | 22 | 32 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 6 | 27 | 49 | 27 | 27 | 27 | 27 | 27 | 16 | 33 | 27 | 16 | 9 | 0 | 0 | 6 | 25 | 70 | 9 | 0 | 16 |
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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