Surf Forecasts:
Siriu surf forecast from 18 Jul 2026:
- Best quality surf: Monday 20 Jul, 9AM (local time) - 6.5ft (2.0m), 8s period, NE swell with cross-offshore winds.
- Most powerful swell: Saturday 18 Jul, 6PM (local time) - 7ft (2.1m), 8s period, NE swell with 640 kJ wave energy.
- Next surfable swell (1★+): Monday 20 Jul, 9AM (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 9AM. 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 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 2.1m 8s and forecast to arrive on Saturday (Jul 18) at 6PM. Winds are predicted to be cross-shore at the time the swell arrives.
| Wave Type | Time (-03) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 9AM (Mon 20th Jul) | 6.5ft (2.0m) 8s |
| Best Surf | 9AM (Mon 20th Jul) | 6.5ft (2.0m) 8s |
| Most Powerful | 6PM (Sat 18th Jul) | 7ft (2.1m) 8s |
Table - best surf conditions forecast for Siriu over the next 16 days.
The Lowdown
Right, let’s break this down for Siriu. There’s a bit of a dry spell at the start, so don’t race down there on day one. Winds are messy those first few days, mostly onshore or cross.
Water temp is 61°F, which is about 5°F colder than normal for this time of year. You’ll be wanting a solid spring suit or even a steamer.
First proper standout is Monday, July 20th morning. Light wind from the north, cross-offshore, keeping things *clean*. Wave height is 7 ft from the northeast, period 8 seconds, combined energy reaching 941. That’s a solid overhead wave with decent shape.
Next real gem is Saturday, July 25th afternoon. Dead calm wind – glassy conditions from the east-northeast. Swell is 6 ft from the east-northeast, period 7 seconds, combined energy of 682. That’s a beautiful, clean session waiting to happen.
Then Monday, July 27th afternoon – another glass-off with a light breeze from the northeast at 3 mph. Swell is 6 ft from the east-northeast, 8-second period, combined energy of 831. Very clean, this one is hard to beat for the second week.
Thursday, July 30th morning is a smaller but cleaner option – 4 ft from the east with a 10-second period, better shaped, cross-off wind from the south-southwest.
Right at the end, Saturday, August 1st morning sees bigger energy coming in – 8 ft from the east, period 8 seconds, combined energy 1508 – but the wind is cross from the north and conditions are only marginal. That one’s more for the crew who know the lineup well.
Best bets? Monday 20th morning and Saturday 25th afternoon. The 27th Monday arvo is a close second. Crowds can show up at Siriu sometimes, but on those clean days it’ll be worth dealing with a few others.
Rusty.
Short Range ForecastMostly dry. Warm (max 26°C on Sat afternoon, min 19°C on Sat night). Wind will be generally light. | Days 4-6 Weather SummaryHeavy rain (total 64mm), heaviest during Wed morning. Warm (max 21°C on Tue morning, min 15°C on Thu night). Wind will be generally light. | ||||||||||||||||||||
Saturday 18 | Sunday 19 | Monday 20 | Tuesday 21 | Wednesday 22 | Thursday 23 | Friday 24 | |||||||||||||||
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) | NE 8 | ENE 8 | NE 8 | NE 8 | NE 8 | ENE 8 | NE 8 | NE 8 | NE 9 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | S 7 | SSE 8 | SSE 8 | SSE 8 | SE 8 | SE 8 |
Wave Graph  | |||||||||||||||||||||
 kJ | 571 | 390 | 555 | 416 | 248 | 294 | 507 | 481 | 460 | 223 | 211 | 181 | 144 | 119 | 137 | 251 | 324 | 345 | 193 | 151 | 153 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross-on | cross | cross | cross | cross | cross-off | cross-on | cross-off | glassy | cross-on | cross-off | cross-on | cross | cross-off | cross-off | cross-off | cross-off | glassy | cross-on | cross-on |
High Tide | 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 | 6:22PM0.49m | 12:23PM0.53m | 7:29PM0.46m | 12:44PM0.60m | 10:32PM0.46m | ||||||
Low Tide | 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 | 3:00PM0.43m | 3:12AM0.30m | 4:48PM0.43m | 4:31AM0.24m | 6:10PM0.40m | |||||||
 | |  | | |  |  | | | | |  |  | |  |  | | | |  |  | |
 | 7:03 | — | — | 7:03 | — | — | 7:03 | — | — | 7:01 | — | — | 7:01 | — | — | 7:01 | — | — | 7:01 | — | — |
 | — | 5:37 | — | — | 5:37 | — | — | 5:37 | — | — | 5:38 | — | — | 5:38 | — | — | 5:39 | — | — | 5:39 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | 7 | 19 | 19 | 13 | 3 | 3 | — | — | — | 4 |
Temp °C | 25 | 26 | 21 | 26 | 26 | 21 | 25 | 26 | 22 | 21 | 20 | 20 | 19 | 17 | 17 | 17 | 16 | 16 | 17 | 18 | 17 |
Feels °C | 22 | 23 | 19 | 23 | 23 | 19 | 24 | 24 | 21 | 22 | 21 | 20 | 20 | 18 | 17 | 16 | 14 | 14 | 16 | 17 | 15 |
Swell 1 Height (m) Direction Period (s) | ENE 8 | ESE 10 | ENE 9 | ENE 8 | SSE 13 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 9 | ENE 9 | SSE 8 | SSE 8 | SE 8 | SE 8 |
| kJ | 344 | 9 | 324 | 274 | 17 | 294 | 315 | 287 | 290 | 223 | 211 | 181 | 144 | 119 | 131 | 106 | 111 | 263 | 193 | 151 | 143 |
Swell 2 Height (m) Direction Period (s) | ESE 10 | SSE 16 | SSE 15 | SSE 13 | — | S 12 | S 12 | S 11 | S 11 | S 10 | S 10 | S 9 | S 8 | S 8 | S 8 | — | — | ENE 8 | ENE 8 | ENE 8 | ENE 8 |
| kJ | 9 | 26 | 21 | 17 | — | 11 | 11 | 10 | 9 | 19 | 47 | 56 | 68 | 88 | 137 | — | — | 57 | 57 | 57 | 53 |
Swell 3 Height (m) Direction Period (s) | SSE 13 | S 13 | SE 9 | — | — | — | — | — | — | — | — | S 15 | S 13 | S 12 | S 11 | — | — | S 11 | S 11 | S 10 | S 9 |
| kJ | 17 | 3 | 3 | — | — | — | — | — | — | — | — | 4 | 4 | 3 | 2 | — | — | 10 | 21 | 31 | 57 |
Wind waves Height (m) Direction Period (s) | NE 8 | ENE 8 | NE 8 | NE 8 | NE 8 | N 5 | NE 8 | NE 8 | NE 9 | — | — | — | — | — | — | S 7 | SSE 8 | SSE 8 | — | — | ENE 8 |
| kJ | 571 | 390 | 555 | 416 | 248 | 52 | 507 | 481 | 460 | — | — | — | — | — | — | 251 | 324 | 345 | — | — | 153 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 33 | 16 | 9 | 9 | 16 | 9 | 0 | 9 | 0 | 0 | 15 | 0 | 9 | 10 | 0 | 0 | 0 | 0 | 0 | 16 | 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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