Siriu Surf Break

Lat Long: 28.00° S 48.63° W

Siriu Surf Forecast and Surf Report

Issued: 2 am 28 Jul 2026 (local time)

Forecast update in  hr  min

Today's Siriu sea temperature is
18.6° C
0.0° 

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


Siriu surf forecast from 28 Jul 2026:

  • Best quality surf: Tuesday 4 Aug, 6AM (local time) - 3ft (0.9m), 11s period, SSE swell with cross-offshore winds.
  • Most powerful swell: Saturday 1 Aug, 6PM (local time) - 6ft (1.8m), 7s period, NE swell with 355 kJ wave energy.
  • Next surfable swell (1★+): Tuesday 28 Jul, 6PM (local time) - 1.5ft (0.5m), 12s 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 Tuesday (Jul 28) at 6PM. The primary swell is predicted to be 0.5m and 12s period with a secondary swell of 0.8m and 6s. The wind is predicted to be glassy as the swell arrives.

The most powerful waves expected at Siriu in the next 16 days are 1.8m 7s and forecast to arrive on Saturday (Aug 01) at 6PM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.6m 4s period and expected on Saturday (Aug 01) at 6AM.

Wave TypeTime (-03) & Date Wave Height & Period
Next good surf (1 star+) 6PM (Tue 28th Jul)1.5ft (0.5m) 12s
Best Surf 6AM (Tue 4th Aug)3ft (0.9m) 11s
Most Powerful 6PM (Sat 1st Aug)6ft (1.8m) 7s

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


The Lowdown

Alright folks, Rusty here. Let’s take a look at what’s cooking for Siriu over the next couple of weeks.

Right off the bat, the first few days are a bit of a write-off. Tuesday and Wednesday are pretty average, with weak little 2ft to 2ft swells and wonky winds. Just not worth paddling out for. Thursday morning the 30th of July gets a little glassy with a tiny 2ft south-southeast swell, but the energy is low (104). It’s surfable but really nothing to get excited about.

Friday and Saturday slide back into poor conditions with fresh cross-breezes and messy, lumpy lines. The swell does bump up a touch on Saturday the 1st of August to 4ft and 5ft, but the wind is still bad and the period is short at 7 seconds. It’s messy out there. Sunday the 2nd and Monday the 3rd bring cleaner windows with glassy and cross-off winds, but the swell is small and weak, still under 3ft. Just ordinary conditions, nothing special.

Then things start to shift. On Tuesday the 4th of August, the energy jumps up nicely to 308 in the morning with a 3ft southeast-southeast swell at 11 seconds and glassy conditions. It’s a solid step up and the first real sign of life. Wednesday the 5th is a standout in the first week: morning has a clean, glassy 6ft south swell at 9 seconds, and the combined energy is a meaty 838. That’s proper surf and the outlook reads “very good.” Thursday the 6th keeps the good vibes with a 4ft south-southeast swell and glassy conditions in the morning.

The real fireworks show up from the 9th through the 12th. Sunday the 9th of August sees the swell building again, with afternoon clean 4ft south swell at 11 seconds and solid energy of 411. Monday the 10th and Tuesday the 11th are where it gets serious. The morning of the 10th offers a clean 4ft south swell with 611 energy, and by the afternoon it jumps to 6ft and a massive 913 energy with clean cross-off wind. That’s a full-on session. Tuesday the 11th is excellent for experienced surfers: clean 5ft swell from the south-southeast, a long period of 14 seconds, and energy over 1200 in the morning. That’s groundswell. It’s going to have real push, proper lines, and long waits between sets. At this size, it’s best left to the crew who know what they’re doing.

Wednesday the 12th of August tops it all off. Morning is glassy with a 6ft south-southeast swell at 14 seconds and combined energy of 1347. That is excellent, clean, powerful surf. The swell direction (south-southeast) is a great match for Siriu’s open-exposed setup.

Water temp is sitting at 66°F, right on the money for this time of year, so no surprises there.

For the standout, I’m calling Wednesday the 12th of August, morning session. The swell is 6ft, south-southeast direction, period at a long 14 seconds, and glassy winds. The energy is massive at 1347. This is the one to circle on the calendar. It’s a powerful groundswell, so it will love the open beach setup here. It’s going to be clean, strong, and lined up. Just know that with a long period swell, the sets will be wide and you might have some time between them, but the trade-off is worth it.

Keep it locked, but don’t sleep on Tuesday the 11th either – that’s nearly as good.

Rusty.

Short Range Forecast

Light rain (total 6mm), mostly falling on Tue night. Warm (max 24°C on Tue morning, min 16°C on Wed night). Wind will be generally light.

Days 4-6 Weather Summary

Light rain (total 2mm), mostly falling on Sat night. Warm (max 27°C on Sat afternoon, min 18°C on Fri morning). Winds decreasing (fresh winds from the N on Fri night, calm by Sun night).

Tuesday
28
Wednesday
29
Thursday
30
Friday
31
Saturday
1
Sunday
2
Monday
3
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
1
0
1
1
0
0
0
0
0
0
0
1
1
0
1
1
1
0
Swell
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Wave
Height (m)
Direction
Period (s)
0.5
S
13
0.5
S
12
0.6
S
11
0.7
S
12
0.7
S
11
0.6
S
10
0.6
S
9
0.8
SSE
9
0.7
S
9
0.5
SSE
12
0.6
S
12
1
ENE
6
1.3
ENE
7
1.6
NE
7
1.2
ENE
7
1
ENE
7
0.9
ENE
7
0.8
ENE
7
0.8
ENE
7
0.7
ENE
7
0.9
ENE
7
Wave Graph
Metric surfscale
Energy kJ
84
71
89
137
114
71
64
113
78
87
101
82
149
247
157
101
72
67
71
52
83
Wind (km/h)
15
N
10
SSE
5
N
5
WSW
15
SSE
10
SW
5
SE
10
NE
15
NNE
25
NNE
25
NNE
25
N
25
N
20
NNE
10
WNW
10
SSW
10
S
5
SSE
5
N
5
ENE
15
N
Wind State
cross
cross
cross
cross-off
cross
cross-off
glassy
cross-on
cross
cross
cross
cross
cross
cross
off
cross-off
cross
glassy
glassy
glassy
cross
High Tide
2:14PM0.74m
1:20AM0.68m
2:36PM0.75m
1:49AM0.73m
2:59PM0.74m
2:19AM0.76m
3:23PM0.73m
2:51AM0.78m
3:50PM0.71m
3:26AM0.77m
4:19PM0.67m
4:05AM0.74m
4:50PM0.62m
Low Tide
8:22PM0.30m
8:17AM-0.01m
8:48PM0.30m
8:52AM-0.02m
9:16PM0.30m
9:28AM-0.01m
9:47PM0.30m
10:04AM0.02m
10:20PM0.31m
10:45AM0.07m
11:00PM0.32m
11:34AM0.15m
11:49PM0.33m
clear
thunderstorm
rain showers
cloud
part cloud
part cloud
cloud
part cloud
part cloud
clear
clear
clear
clear
clear
rain showers
cloud
light rain
cloud
cloud
cloud
cloud
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
6:58
6:58
6:58
6:56
6:56
6:56
6:54
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
5:43
5:43
5:44
5:44
5:45
5:45
5:45
 mm
1
5
1
1
Temp °C
24
22
19
20
20
17
18
19
17
21
21
18
25
27
21
19
18
19
21
22
19
Feels °C
25
23
20
22
19
16
19
18
16
18
17
15
22
25
21
19
18
21
23
24
19
  • Map Icons:
  • Break
  • 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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