Siriu Surf Break

Lat Long: 28.00° S 48.63° W

Siriu Surf Forecast and Surf Report

Issued: 8 am 07 Aug 2026 (local time)

Forecast update in  hr  min

Today's Siriu sea temperature is
19.4° C
0.8° 

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


Siriu surf forecast from 7 Aug 2026:

  • Best quality surf: Saturday 8 Aug, 9PM (local time) - 5ft (1.6m), 13s period, SSE swell with offshore winds.
  • Most powerful swell: Monday 10 Aug, 9AM (local time) - 7ft (2.2m), 12s period, S swell with 1,415 kJ wave energy.
  • Next surfable swell (1★+): Saturday 8 Aug, 12AM (local time) - 6ft (1.9m), 10s 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 Saturday (Aug 08) at 12AM. The primary swell is predicted to be 1.9m and 10s period with a secondary swell of 0.5m and 8s. The wind is predicted to be glassy as the swell arrives.

The most powerful waves expected at Siriu in the next 16 days are 2.2m 12s and forecast to arrive on Monday (Aug 10) at 9AM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.3m 3s period and expected on Sunday (Aug 09) at 12AM.

Wave TypeTime (-03) & Date Wave Height & Period
Next good surf (1 star+)12AM (Sat 8th Aug)6ft (1.9m) 10s
Best Surf 9PM (Sat 8th Aug)5ft (1.6m) 13s
Most Powerful 9AM (Mon 10th Aug)7ft (2.2m) 12s

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


The Lowdown

Alright folks, Rusty here with a look at the next couple of weeks for this one spot.

We are starting off a bit slow, but this forecast has some real gems hidden in it, especially for anyone willing to wait for the top-shelf conditions later on. The early days look pretty average, with a lot of onshore or cross-shore wind messing things up, but the pattern really cleans up from Sunday afternoon and into the next week.

First up, Siriu. The water’s sitting at 67°, which is about average for this time of year, nothing to write home about.

Friday the 7th is a write-off. You’ve got a weak cross-shore chop with poor surf. Just forget it.

Saturday the 8th is building, but it’s still rainy with a cross-shore breeze. We’re seeing some new groundswell push in from the SSE with a long 14-second period. This swell has some serious energy behind it (1209 on Saturday morning, jumping to 1405 in the arvo), but with that wind, it’s not going to be clean. A bit of a frustrating day, waves are there but blown out.

Now, Sunday the 9th is where things start to change. The wind swings to the SSW and goes clean offshore for Siriu. The morning is still a bit messy with 6ft SSE swell, but the afternoon is the first real standout. Clean, cross-offshore wind, gentle breeze, and the swell jumps to a solid 8ft from the south with an 11-second period. The energy is pumping at (1978). This is excellent for experienced surfers – it’s big enough to be a handful for beginners. This is a proper session.

Monday the 10th keeps the good times rolling. More clean, cross-offshore conditions with a very long 12-second, 7ft S swell, pushing massive energy levels (2353). This is another day for the experienced crew, the wave quality is going to be top-notch with that long period and clean face.

Tuesday the 11th is the absolute standout of the whole forecast. The wind drops to almost nothing with glassy conditions for the afternoon session. We’re still getting a solid 6ft SSE groundswell with a very long 12-second period. The energy remains strong (911). This is as good as it gets for Siriu – glassy, clean, and a solid, powerful groundswell. Make your plans for this afternoon.

Wednesday the 12th and Thursday the 13th see a return of cross-shore winds and more marginal conditions, though the swell hangs around. The energy is still there, but the wind is a problem.

Friday the 14th is another cracker. Glassy conditions again, this time in the morning, with 6ft of SSE groundswell at a very long 14 seconds. Energy is up there (1115). This is going to be another clean, high-quality session for the experienced surfer.

The following week drops off a bit. Saturday the 15th and Sunday the 16th are okay with clean wind and smaller but fun waves, but nothing compared to the glory days of the 11th. Then we hit a rough patch from the 16th afternoon through the 21st with onshore winds and poor conditions.

There is one bright spot later on. Wednesday the 19th morning looks promising with glassy conditions and 4ft of ENE swell, but the fetch is shorter. Then, as we get into the 22nd, the swell drops away to nothing. A long-range, less certain mention for the 19th morning, but don’t hold your breath.

So to wrap it up, the best surf on offer is Tuesday the 11th afternoon for that glassy perfection, with Sunday the 9th and Friday the 14th as close runner-ups. Get out there.

Rusty

Short Range Forecast

Moderate rain (total 10mm), heaviest on Sun afternoon. Very mild (max 18°C on Fri morning, min 11°C on Sun night). Wind will be generally light.

Days 4-6 Weather Summary

Heavy rain (total 36mm), heaviest during Wed morning. Very mild (max 17°C on Wed night, min 11°C on Mon morning). Wind will be generally light.

Friday
7
Saturday
8
Sunday
9
Monday
10
Tuesday
11
Wednesday
12
Thursday
13
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
1
3
2
3
1
2
4
3
4
4
3
3
3
3
2
2
1
2
3
4
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
8
1.9
S
8
1.9
S
10
1.7
SSE
14
1.8
SSE
14
1.6
SSE
13
1.7
S
8
2.3
S
11
1.8
SSE
11
2.2
S
12
2.1
S
12
1.6
S
12
1.7
SSE
12
1.8
SSE
12
1.9
SSE
12
1.8
SSE
12
1.6
SSE
12
1.5
SSE
12
1.3
SSE
11
1.6
SSE
16
1.7
SSE
14
Wave Graph
Metric surfscale
Energy kJ
98
432
730
1155
1207
774
337
1232
792
1415
1290
699
833
887
1089
948
706
603
408
1245
1187
Wind (km/h)
20
S
20
S
5
ESE
15
N
15
N
15
S
20
SSW
15
SSW
15
SW
15
SW
10
SSW
10
SW
5
SW
5
SW
5
N
10
NNE
10
NNE
20
NNE
15
N
15
N
15
SSW
Wind State
cross
cross
glassy
cross
cross
cross
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
glassy
cross
cross
cross
cross
cross
cross
cross-off
High Tide
12:18PM0.66m
00:27AM0.42m
1:03PM0.75m
00:42AM0.45m
1:43PM0.81m
00:39AM0.49m
2:19PM0.83m
00:41AM0.55m
2:47PM0.81m
00:59AM0.63m
3:02PM0.76m
1:25AM0.70m
3:05PM0.70m
1:55AM0.76m
Low Tide
5:46PM0.34m
5:03AM0.19m
6:53PM0.31m
6:02AM0.10m
7:33PM0.30m
6:52AM0.01m
8:05PM0.31m
7:36AM-0.05m
8:33PM0.34m
8:17AM-0.08m
8:57PM0.36m
8:54AM-0.06m
9:18PM0.37m
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part cloud
part cloud
light rain
rain showers
part cloud
cloud
light rain
light rain
cloud
cloud
light rain
light rain
light rain
heavy rain
heavy rain
light rain
part cloud
cloud
rain showers
light rain
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
6:52
6:50
6:50
6:50
6:48
6:48
6:47
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
5:47
5:47
5:49
5:49
5:50
5:50
5:51
 mm
2
1
5
2
1
2
4
15
11
3
1
1
Temp °C
18
17
14
15
18
18
14
13
11
12
13
13
12
12
13
15
15
17
21
21
19
Feels °C
16
12
11
12
17
18
10
10
8
8
10
10
11
12
13
14
14
16
21
20
19
  • 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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