Siriu Surf Break

Lat Long: 28.00° S 48.63° W

Siriu Surf Forecast and Surf Report

Issued: 8 am 12 Jul 2026 (local time)

Forecast update in  hr  min

Today's Siriu sea temperature is
15.3° C
3.6° 

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


Siriu surf forecast from 12 Jul 2026:

  • Best quality surf: Monday 13 Jul, 6AM (local time) - 7.5ft (2.3m), 8s period, S swell with cross-offshore winds.
  • Most powerful swell: Monday 13 Jul, 3AM (local time) - 8ft (2.4m), 8s period, S swell with 765 kJ wave energy.
  • Next surfable swell (1★+): Monday 13 Jul, 6AM (local time) - 7.5ft (2.3m), 8s 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 Monday (Jul 13) at 6AM. The primary swell is predicted to be 2.3m and 8s period with a secondary swell of 1.8m and 8s. Another secondary swell of 0.7m 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 2.4m 8s and forecast to arrive on Monday (Jul 13) at 3AM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.3m 7s period and expected on Monday (Jul 13) at 9PM.

Wave TypeTime (-03) & Date Wave Height & Period
Next good surf (1 star+) 6AM (Mon 13th Jul)7.5ft (2.3m) 8s
Best Surf 6AM (Mon 13th Jul)7.5ft (2.3m) 8s
Most Powerful 3AM (Mon 13th Jul)8ft (2.4m) 8s

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


G’day, Rusty here. We’ve got a mixed bag coming up for Siriu, with a bit of a slow start before the real gems show themselves. The water’s sitting at 60°, which is a solid 7° colder than usual for this time of year – that’s a proper chilly anomaly, so you’ll want a thick wetsuit.

The first real standout hits Sunday morning, July 12th. Siriu will be seeing a 6 ft south swell, rolling in with an 11-second period from the south. The wave energy is pumping hard with a reading of 1263, and with a cross-offshore wind from the SSW at 12 mph, the surface will be clean. This is quality stuff for experienced surfers – the combination of size, period, and wind makes this the best on offer in the first week. It’s a bit much for beginners though, given the height.

We roll into Monday morning, July 13th, and there’s another strong contender. A 7 ft south swell with an 8-second period is wrapping in, and the energy is right up there at 1095. The wind is cross-off from the southwest at a gentler 9 mph, keeping it clean. This is solid, powerful surfing for those who know what they’re doing. The afternoon gets a bit messier as the wind picks up.

Tuesday the 14th morning, and oh boy, this is a beauty. The swell drops a touch to 6 ft from the southeast, with a nice 10-second period, and the wind goes glassy – a pure 3 mph from the WNW. That’s as clean as it gets. The energy is moderate at 546, but the conditions are perfect for a long session. This is the pick for a mellow, high-quality surf.

After that, the middle of the week turns average. The wind swings onshore or cross-shore, and the quality drops right off. Wednesday the 15th and Thursday the 16th are poor to marginal, with the swell bouncing around but the wind making a mess of things. Friday the 17th and Saturday the 18th have some size with waves around 6 ft to 7 ft, but the wind is cross or cross-on from the N or NNE, leaving the surface lumpy and choppy. Not worth paddling out for.

Sunday morning, the 19th, is more of the same – 6 ft from the NE with cross winds. It’s still marginal at best.

Now, the second week brings another highlight. Monday morning, July 20th, sees a 6 ft NE swell at 9 seconds, with a gentle cross-off breeze from the NNW at 9 mph. The energy is 725, and the surface is clean. This is a solid, dependable session. Tuesday morning, July 21st, is a dark horse with light rain and a glassy WSW breeze at 3 mph, wrapping around a 4 ft ENE swell at 8 seconds. The energy is low at 213, but the glassy water is a rare treat for a clean, small-wave day.

We get a bit of a spike on Wednesday morning, the 22nd, with a 7 ft south swell at 9 seconds and an energy reading of 1294, but the wind is cross from the NNE at 16 mph, which will chop it up. It’s a powerful swell but not a clean one – one for the experts who don’t mind a bit of battle.

The rest of the second week fades out. Thursday the 23rd and Friday the 24th have small, cleaner swells (4 ft to 4 ft) with cross-off winds, but the energy is low and the size is small. Saturday the 25th drops right off into tiny, weak waves with poor wind, and Sunday the 26th is barely surfable – a 2 ft ENE swell with a pathetic energy of 45. The last couple of days, Monday and Tuesday the 27th and 28th, are poor to marginal with small, wind-affected waves.

If you’re chasing the best, hit the Sunday the 12th morning session – that south swell with clean cross-off wind is the highlight. Monday the 13th morning is a close second with its power. For a glassy, mellow day, Tuesday the 14th morning is the one.

Stay safe out there, and don’t forget the warm wax.

Rusty.

Short Range Forecast

Mostly dry. Very mild (max 18°C on Sun morning, min 11°C on Sun night). Winds decreasing (fresh winds from the S on Sun afternoon, calm by Tue morning).

Days 4-6 Weather Summary

Mostly dry. Warm (max 25°C on Fri morning, min 14°C on Wed night). Mainly fresh winds.

Sunday
12
Monday
13
Tuesday
14
Wednesday
15
Thursday
16
Friday
17
Saturday
18
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
Rating
(10 max)
4
0
3
4
2
4
3
1
2
1
0
0
0
0
0
1
0
1
1
0
2
Swell
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Wave
Height (m)
Direction
Period (s)
1.7
S
11
1.8
S
7
2.4
S
8
2.1
S
8
1.8
S
8
1.7
S
10
1.7
SE
10
1.9
SE
10
1.7
ESE
10
1.6
ESE
10
1.3
ESE
10
1.1
ESE
10
1
ESE
11
1
ESE
11
0.9
ESE
11
1.9
NE
8
1.5
ENE
8
1.9
NE
8
2
NE
8
1.6
ENE
8
2.1
NE
8
Wave Graph
Metric surfscale
Energy kJ
651
352
688
593
422
529
542
652
544
461
290
250
242
230
205
424
285
486
515
334
569
Wind (km/h)
15
SSW
25
S
15
SW
15
SW
20
SSW
10
WSW
0
NW
10
NNE
15
N
15
N
25
NNE
20
N
20
N
25
NNE
20
N
20
N
20
NNE
20
N
15
NNE
20
NNE
10
N
Wind State
cross-off
cross
cross-off
cross-off
cross-off
off
glassy
cross-on
cross
cross
cross
cross
cross
cross-on
cross
cross
cross-on
cross
cross
cross-on
cross
High Tide
2:18PM0.81m
00:49AM0.50m
3:00PM0.82m
1:07AM0.55m
3:36PM0.78m
1:33AM0.61m
3:55PM0.72m
2:04AM0.67m
4:01PM0.65m
2:38AM0.72m
4:11PM0.60m
3:15AM0.73m
4:27PM0.56m
9:16PM0.43m
Low Tide
8:25PM0.29m
7:48AM0.00m
9:05PM0.33m
8:33AM-0.04m
9:39PM0.39m
9:15AM-0.05m
10:07PM0.43m
9:56AM-0.02m
10:30PM0.46m
10:35AM0.03m
10:48PM0.45m
11:12AM0.11m
8:49PM0.43m
clear
part cloud
part cloud
clear
clear
part cloud
cloud
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
7:05
7:05
7:05
7:03
7:03
7:03
7:03
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
5:34
5:35
5:35
5:36
5:36
5:37
5:37
 mm
Temp °C
18
17
14
15
16
14
17
18
16
19
19
15
21
21
17
25
24
20
26
26
21
Feels °C
14
12
10
11
11
11
16
16
14
15
14
12
17
17
13
22
21
18
23
23
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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