Siriu Surf Break

Lat Long: 28.00° S 48.63° W

Siriu Surf Forecast and Surf Report

Issued: 2 am 01 Aug 2026 (local time)

Forecast update in  hr  min

Today's Siriu sea temperature is
19.1° C
0.4° 

Siriu surf forecast is for near shore open water. Breaking waves will often be smaller at less exposed spots.


Siriu surf forecast from 1 Aug 2026:

  • Best quality surf: Saturday 8 Aug, 9AM (local time) - 4.5ft (1.4m), 10s period, S swell with glassy winds.
  • Most powerful swell: Friday 7 Aug, 12PM (local time) - 6ft (1.9m), 8s period, S swell with 413 kJ wave energy.
  • Next surfable swell (1★+): Sunday 2 Aug, 6AM (local time) - 5.5ft (1.7m), 7s 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 Sunday (Aug 02) at 6AM. The primary swell is predicted to be 1.7m and 7s period with a secondary swell of 1.3m and 7s. Another secondary swell of 0.1m and 10s 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 1.9m 8s and forecast to arrive on Friday (Aug 07) at 12PM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.0m 4s period and expected on Friday (Aug 07) at 3AM.

Wave TypeTime (-03) & Date Wave Height & Period
Next good surf (1 star+) 6AM (Sun 2nd Aug)5.5ft (1.7m) 7s
Best Surf 9AM (Sat 8th Aug)4.5ft (1.4m) 10s
Most Powerful12PM (Fri 7th Aug)6ft (1.9m) 8s

Table - best surf conditions forecast for Siriu over the next 16 days.


The Lowdown

Alright, let's talk surf. These first days of August at Siriu are flat out dismal—no two ways about it. We've got small, weak swell, nothing over 4ft on the sets, with periods hanging around 6-8 seconds, and the wind's been doing its own thing, mostly cross-shore or messing up the faces. The water's sitting right around 66°, which is about normal for this time of year, so you won't need the thick rubber yet. But honestly, the lack of power is the story—the combined swell energy's barely cracking 100 to 160 on the old scale, so if you can find a wave, it's going to be soft and weak. Saturday and Sunday (Aug 1-2) are a total wash.

Monday and Tuesday (Aug 3-4) get a little more interesting. That SSE groundswell shows up late Tuesday morning—period jumps to 12 seconds—but it's still a knee-high tease, and the energy's only just over 300. The light winds might make it glassy, but there's just not enough water moving. This is a “dream about it” day, not a “drive to it” day.

Wednesday and Thursday (Aug 5-6)? Back to slop and flatness. Don't even bother checking your wax.

Now, here we go. Friday (Aug 7) we start to see the ocean grow a pair. Swell builds from the south—1.6m in the morning, period 7 seconds—but the real change comes Saturday (Aug 8). We get an offshore WNW breeze at dawn, 1.4m of S swell at 10 seconds, and the energy jumps to 645. The afternoon is pure glass—zero wind, 2.0m of S swell. This is the first proper green light. The waves have push, they’ve got shape, and with that glassy surface, you’ll be picking your lines for days. It’s a beach break, so expect some sections closing out, but there’s real quality available. There will probably be a few others out—Siriu can get crowded—but it's worth sharing.

Sunday (Aug 9) keeps the size—1.9m in the morning with clean cross-off wind, but the afternoon turns fresh and bumpy. Catch it early. Monday (Aug 10) afternoon gets big—2.5m—but the SE wind makes it choppy. The energy reads 2574, so there's plenty of juice, but the conditions are rough. Early morning is still the window.

But the one to mark in red is Tuesday (Aug 11) morning. 2.4m of S swell, period 14 seconds—proper groundswell with serious grunt—and the energy is at 2153. Light cross-shore wind, and it’s clean. This is big surf, and it’s for experienced heads only. That long period at a beach break can make it heavy and fast, maybe even too straight. This is a “know your limits” day. The afternoon gets cross-on and turns messy, so be out early.

The rest of the week settles down a bit. Wednesday (Aug 12) still has 1.5m of S swell and some clean morning conditions. Thursday (Aug 13) gets small and glassy in the afternoon—super fun, light boards out. Friday (Aug 14) is a bit of a mixed bag.

But then, another standout. Saturday (Aug 15) morning: 2.5m of S swell, light offshore SSW wind, and 1381 on the energy scale. This is another excellent session for those who can handle serious size. Sunday (Aug 16) morning has that glass, too—2.2m of SSE swell, WNW breeze, energy at 1542. Two back-to-back mornings of heavy, clean surf to close the run.

So here’s the deal. The first six days are a bust—just flat and messy. The fire starts on Saturday Aug 8. The real big-game days are Tuesday Aug 11 and Saturday Aug 15, maybe Sunday Aug 16 too. Those are for the experienced crew—over 8ft faces with real power, clean wind, and that long-period punch. For the groms and casual surfers, aim for the Aug 8-10 stretch when it’s under 5ft, or the smaller, glassy windows around Aug 12-13. But don't sleep on the energy numbers—that swell’s got some serious weight behind it.

Get your paddling arms ready, don’t forget the sunscreen

Short Range Forecast

Mostly dry. Warm (max 24°C on Mon afternoon, min 16°C on Sun afternoon). Winds decreasing (fresh winds from the NNE on Sat afternoon, calm by Sun night).

Days 4-6 Weather Summary

Moderate rain (total 12mm), heaviest on Wed morning. Warm (max 24°C on Tue morning, min 18°C on Tue night). Wind will be generally light.

Saturday
1
Sunday
2
Monday
3
Tuesday
4
Wednesday
5
Thursday
6
Friday
7
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
Rating
(10 max)
0
0
0
0
0
1
0
0
1
1
1
2
1
1
0
0
0
0
0
1
1
Swell
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Wave
Height (m)
Direction
Period (s)
0.9
ENE
6
1.2
NE
6
1.4
NE
7
1.3
ENE
7
1.1
ENE
7
1
ENE
8
0.9
ENE
8
1
ENE
7
0.9
ENE
7
0.8
SSE
12
0.9
SSE
11
0.8
SSE
11
0.8
SSE
10
1
ENE
7
0.9
ENE
7
0.9
ENE
8
0.9
ENE
8
0.8
ENE
8
1.6
S
7
1.5
S
8
1.4
S
9
Wave Graph
Metric surfscale
Energy kJ
61
116
163
160
134
107
81
114
93
183
209
150
114
104
74
91
98
67
275
295
325
Wind (km/h)
20
N
25
NE
20
N
20
SSW
15
SSE
0
N
10
NNE
15
NE
10
N
10
NNE
5
E
10
SSW
5
SSW
10
NNE
10
N
5
N
5
ESE
10
N
20
N
5
NNE
10
N
Wind State
cross
cross-on
cross
cross-off
cross-on
glassy
cross-on
cross-on
cross
cross
on
cross-off
cross-off
cross-on
cross
cross
on
cross
cross
cross
cross
High Tide
3:50PM0.71m
3:26AM0.77m
4:19PM0.67m
4:05AM0.74m
4:50PM0.62m
4:48AM0.68m
5:24PM0.56m
5:42AM0.61m
6:02PM0.48m
7:06AM0.54m
6:49PM0.41m
12:18PM0.66m
00:27AM0.42m
Low Tide
10:04AM0.02m
10:20PM0.31m
10:45AM0.07m
11:00PM0.32m
11:34AM0.15m
11:49PM0.33m
12:39PM0.24m
00:58AM0.34m
2:08PM0.32m
9:41PM0.38m
9:11AM0.52m
3:56PM0.36m
9:30PM0.37m
3:48AM0.28m
5:46PM0.34m
clear
clear
clear
part cloud
part cloud
part cloud
part cloud
part cloud
part cloud
part cloud
part cloud
part cloud
heavy rain
rain showers
clear
clear
part cloud
part cloud
rain showers
clear
clear
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
6:56
6:56
6:54
6:54
6:54
6:52
6:52
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
5:45
5:45
5:45
5:45
5:46
5:46
5:47
 mm
11
1
1
Temp °C
22
22
19
19
19
17
22
24
20
24
24
20
18
19
18
24
23
21
26
24
22
Feels °C
19
19
20
17
18
17
20
22
20
25
26
21
19
20
18
25
25
22
28
26
24
  • Map Icons:
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  • Live Wave Height (m)
  • Live Wind Speed (km/h)
  • Surf Rating (10 Max)
  • Ocean Swells (m)
  • Wind Speed (km/h)
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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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