Surf Forecasts:
Siriu surf forecast from 16 Jul 2026:
- Best quality surf: Monday 20 Jul, 6AM (local time) - 6.5ft (2.0m), 8s period, NE swell with cross-offshore winds.
- Most powerful swell: Saturday 18 Jul, 9PM (local time) - 7ft (2.2m), 9s period, NE swell with 736 kJ wave energy.
- Next surfable swell (1★+): Monday 20 Jul, 6AM (local time) - 6.5ft (2.0m), 8s period with NE 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 20) at 6AM. The primary swell is predicted to be 2.0m and 8s period with a secondary swell of 1.6m and 8s. Another secondary swell of 0.2m and 11s 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 2.2m 9s and forecast to arrive on Saturday (Jul 18) at 9PM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.9m 4s period and expected on Monday (Jul 20) at 12AM.
| Wave Type | Time (-03) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 6AM (Mon 20th Jul) | 6.5ft (2.0m) 8s |
| Best Surf | 6AM (Mon 20th Jul) | 6.5ft (2.0m) 8s |
| Most Powerful | 9PM (Sat 18th Jul) | 7ft (2.2m) 9s |
Table - best surf conditions forecast for Siriu over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let’s break down what the next couple of weeks look like.
It’s a slow start, I won’t lie. The first few days at Siriu are a total bust. The wind is nasty from the north, cross-shore and cross-onshore, strong and lumpy, and the waves are just junk. You’d be wasting your time.
The first real chance comes on Monday morning, the 20th of July. The wind switches to a light SSW cross-off, and the water gets clean. The swell is a modest 5ft from the ENE with a short 8-second period, but the energy is solid (280). For a beginner-friendly spot, that’s a fun, rideable size. The water is a very unusual 60°F, which is a whopping 6°F colder than normal for this time of year, so you’ll want a thick wetsuit.
The weekend picks up, but it’s messy. Saturday morning, the 25th, shows a bump to 6ft from the S (963 energy). It’s a bit of a wash with onshore wind and rain, but it’s surfable if you’re desperate. The real standout is the following Saturday, which is the 27th of July. The swell jumps to 8ft from the SSE, with a very long 15-second period and a massive 3003 energy reading. That’s a powerful, deep water groundswell. The wind is cross-shore, so it’s not perfect, but the size and juice are serious. At 8ft, this is for experts only – way too big for beginners.
The best of the whole forecast lands on Wednesday, the 29th of July. The morning brings clean 5ft SSE swell (11 seconds) with a light NNW cross-off wind, and the afternoon goes glassy with a light easterly and 5ft SSE swell. The energy is moderate (640 and 573), but the conditions are called “very good” – clean, glassy, and lined up. For Siriu, that’s a magic day. Keep in mind the longer period (11 seconds) means the sets will have gaps, so be ready to wait between waves.
So, there’s a long dry spell from the start until the 20th. After that, it’s a mixed bag, with that Wednesday the 29th being the one to mark on the calendar. Crowds are “sometimes” at Siriu, so on that good day, you might have some company, but it’s worth it.
Rusty.
Short Range ForecastMostly dry. Warm (max 25°C on Sat morning, min 14°C on Wed night). Mainly fresh winds. | Days 5-7 Weather SummaryMostly dry. Warm (max 29°C on Tue morning, min 18°C on Mon afternoon). Wind will be generally light. | ||||||||||||||||||||
Wed 15 | Thursday 16 | Friday 17 | Saturday 18 | Sunday 19 | Monday 20 | Tuesday 21 | |||||||||||||||
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 10 | ESE 10 | ESE 10 | ESE 10 | NE 7 | NE 8 | ENE 8 | NE 8 | NE 8 | ENE 8 | NE 9 | NE 8 | ENE 8 | ENE 8 | ENE 8 | NE 8 | ENE 8 | NE 8 | ENE 8 | ENE 8 | ENE 8 |
Wave Graph  | |||||||||||||||||||||
 kJ | 290 | 240 | 182 | 163 | 188 | 416 | 334 | 602 | 682 | 443 | 730 | 560 | 365 | 290 | 270 | 448 | 234 | 319 | 161 | 125 | 116 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross | cross | cross-on | cross | cross | cross-on | cross | cross | cross-on | cross | cross | cross | cross | cross-off | cross-on | cross | cross | cross | cross-off | off |
High Tide | 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 | 11:26PM0.35m | 6:39AM0.52m | |||||
Low Tide | 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 | 10:47PM0.35m | 10:04AM0.46m | |||||||
 |  | | | | | | | | | | | | |  | | | | |  |  | |
 | — | — | 7:03 | — | — | 7:03 | — | — | 7:03 | — | — | 7:03 | — | — | 7:03 | — | — | 7:01 | — | — | 7:01 |
 | 5:36 | — | — | 5:36 | — | — | 5:37 | — | — | 5:37 | — | — | 5:37 | — | — | 5:37 | — | — | 5:38 | — | 5:38 |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 19 | 14 | 20 | 21 | 16 | 22 | 23 | 18 | 25 | 25 | 20 | 26 | 26 | 22 | 21 | 21 | 20 | 29 | 29 | 24 | 23 |
Feels °C | 14 | 10 | 16 | 17 | 12 | 18 | 20 | 16 | 21 | 22 | 17 | 23 | 23 | 20 | 22 | 22 | 19 | 27 | 27 | 23 | 23 |
Swell 1 Height (m) Direction Period (s) | ESE 10 | ESE 10 | NE 6 | ESE 10 | ESE 10 | ENE 8 | ESE 10 | ENE 8 | ENE 8 | SSE 16 | ENE 9 | ENE 8 | SSE 13 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 |
| kJ | 290 | 240 | 85 | 163 | 133 | 267 | 40 | 388 | 422 | 26 | 439 | 323 | 17 | 290 | 270 | 270 | 234 | 207 | 161 | 125 | 116 |
Swell 2 Height (m) Direction Period (s) | S 10 | S 13 | ESE 10 | SE 11 | S 20 | ESE 10 | SSE 16 | SE 10 | ESE 10 | S 13 | SSE 15 | SSE 13 | — | S 12 | S 11 | S 11 | S 10 | S 10 | S 10 | S 9 | S 8 |
| kJ | 2 | 3 | 182 | 18 | 7 | 67 | 26 | 25 | 9 | 3 | 21 | 17 | — | 11 | 10 | 9 | 8 | 8 | 8 | 14 | 22 |
Swell 3 Height (m) Direction Period (s) | S 14 | S 13 | S 13 | S 12 | S 13 | SE 18 | S 12 | SSE 15 | SSE 13 | S 10 | SE 9 | — | — | — | — | — | S 14 | — | S 12 | — | S 3 |
| kJ | 4 | 3 | 3 | 3 | 3 | 12 | 3 | 21 | 17 | 2 | 3 | — | — | — | — | — | 4 | — | 3 | — | 1 |
Wind waves Height (m) Direction Period (s) | NE 5 | NE 6 | NNE 6 | NE 7 | NE 7 | NE 8 | ENE 8 | NE 8 | NE 8 | ENE 8 | NE 9 | NE 8 | ENE 8 | N 4 | — | NE 8 | N 4 | NE 8 | — | SSW 2 | — |
| kJ | 41 | 52 | 176 | 124 | 188 | 416 | 334 | 602 | 682 | 443 | 730 | 560 | 365 | 30 | — | 448 | 26 | 319 | — | 1 | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 49 | 27 | 27 | 27 | 27 | 27 | 16 | 33 | 33 | 16 | 33 | 25 | 16 | 9 | 0 | 16 | 6 | 9 | 57 | 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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