Siriu Surf Break

Lat Long: 28.00° S 48.63° W

Siriu Surf Forecast and Surf Report

Issued: 8 pm 21 Jul 2026 (local time)

Forecast update in  hr  min

Today's Siriu sea temperature is
17.9° 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 22 Jul 2026:

  • Best quality surf: Thursday 23 Jul, 6PM (local time) - 8ft (2.4m), 9s period, S swell with cross-offshore winds.
  • Most powerful swell: Thursday 23 Jul, 6PM (local time) - 8ft (2.4m), 9s period, S swell with 1,004 kJ wave energy.
  • Next surfable swell (1★+): Wednesday 22 Jul, 3AM (local time) - 3.5ft (1.1m), 8s period with ENE 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 Wednesday (Jul 22) at 3AM. The primary swell is predicted to be 1.1m and 8s period with a secondary swell of 0.5m and 8s. 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 9s and forecast to arrive on Thursday (Jul 23) 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 1.0m 5s period and expected on Wednesday (Jul 22) at 6PM.

Wave TypeTime (-03) & Date Wave Height & Period
Next good surf (1 star+) 3AM (Wed 22nd Jul)3.5ft (1.1m) 8s
Best Surf 6PM (Thu 23rd Jul)8ft (2.4m) 9s
Most Powerful 6PM (Thu 23rd Jul)8ft (2.4m) 9s

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


The Lowdown

Alright, this is Rusty, and I’ve got a good look at what’s coming for Siriu over the next couple of weeks. Let’s get into it.

First off, there’s a bit of a slow start, but don’t stress – the surf kicks in from Wednesday the 22nd and it’s looking pretty promising early on. Wednesday morning, we’ve got a 4ft swell rolling in from the ENE with a period of 8 seconds. The wind is glassy, dead calm from the NE at just 3 mph, and the combined energy is moderate at 242. That’s a clean, fun morning for a beginner-friendly wave. The water temperature is about average for the time of year, nothing wild. The afternoon holds up too, with a cross-off breeze from the NNW keeping the 4ft ENE swell tidy. Solid start.

Thursday the 23rd sees the swell shift to the south and pick up a bit. The morning is a little messy with a 5ft S swell at 7 seconds and moderate cross-off wind, but it’s still surfable. The real jump comes Thursday afternoon – the swell bumps to 8ft from the south at 9 seconds, and the energy jumps right up to 1719, which is strong. That’s a lot of power, and it’s probably pushing the limits for beginners, but for anyone with a bit of experience, it’s worth a look. The wind is cross-off from the SW, so it’s clean.

Friday the 24th is a standout. Morning and afternoon both offer 6ft swell from the SE at 10 seconds, with glassy conditions in the afternoon – wind drops to 3 mph from the ESE, dead calm. Combined energy around 658 and 629, so moderate but solid. That’s your best bet early in the window: clean, consistent, and fun for all levels.

Saturday the 25th is another glassy morning, with 5ft from the SE at 9 seconds, energy at 555, and no wind. That’s a beautiful session. The afternoon gets a bit lumpy with a cross-shore wind from the south, so catch the morning.

Sunday the 26th drops off a bit – the swell backs down to 3ft, and the wind turns cross-on, so it’s not great. That’s the start of a slow patch. Monday and Tuesday are small, with 3ft to 3ft and mainly poor conditions. Wednesday the 29th is tiny, 2ft to 2ft, not worth paddling out for.

Then things start to turn around. Thursday the 30th brings a 4ft S swell at 9 seconds with glassy conditions in the morning – energy is 266, decent but not pumping. The afternoon builds to 5ft but with a cross-on wind, so not ideal.

Now, here’s where it gets interesting. Friday the 31st and Saturday the 1st of August are building, but the wind is messy – strong cross-on and cross-shore winds, and the swell jumps to 8ft and then 10ft. That’s big, and for Siriu, it’s too big for most. The energy numbers are through the roof – 1345 up to 2016 – but the conditions are choppy and tough. This is more of a kitesurfing setup than a paddle session.

Sunday the 2nd and Monday the 3rd of August stay big – 10ft from the east at 10 seconds, with clean cross-off winds. The energy is massive, 2549 and 2688, but the swell is too big for this break. It’s powerful but not for the faint-hearted.

The real standout in the second week comes on Wednesday the 5th and Thursday the 6th of August. Wednesday morning is glassy, 8ft from the ESE at 11 seconds, with no wind – energy is 1436, strong but clean. That’s excellent for experienced surfers. Thursday morning is even better: 7ft from the ESE at a very long 14 seconds, with light cross-off wind from the NNW, energy at 2250. That’s groundswell, with long wait times between sets, but the shape will be world-class. This is the best on offer in the whole forecast – a proper session for those who know what they’re doing.

So, overall: the first week has a couple of clean, fun days around Friday and Saturday, but the real gem is the first week of August, especially Wednesday and Thursday mornings. That’s where you want to be.

Rusty.

Short Range Forecast

Heavy rain (total 21mm), heaviest during Wed morning. Warm (max 20°C on Wed afternoon, min 16°C on Thu morning). Wind will be generally light.

Days 5-7 Weather Summary

Mostly dry. Warm (max 22°C on Mon morning, min 14°C on Sat night). Wind will be generally light.

Wednesday
22
Thursday
23
Friday
24
Saturday
25
Sunday
26
Monday
27
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
Rating
(10 max)
1
2
2
2
1
3
3
3
3
3
3
1
3
1
0
0
1
0
1
Swell
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Wave
Height (m)
Direction
Period (s)
1.2
ENE
8
1.3
ENE
8
1.3
ENE
8
1.2
ENE
9
1.4
S
7
2.4
S
9
2.1
SSE
9
1.8
SE
10
1.8
SE
10
1.8
SE
9
1.6
SE
9
1.5
SE
9
0.9
SSE
13
0.9
SSE
12
1.2
ESE
9
1.1
ESE
9
1
ESE
9
0.9
ESE
9
0.9
ESE
9
Wave Graph
Metric surfscale
Energy kJ
176
206
232
203
188
956
766
587
561
508
421
342
312
240
207
180
154
149
126
Wind (km/h)
20
SSW
5
NE
15
NNW
15
SW
20
SW
20
SW
10
SSW
10
SW
5
ESE
5
NNW
5
WSW
15
S
10
SSW
5
NE
10
ENE
15
N
15
N
20
NNE
10
NNE
Wind State
cross-off
glassy
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
glassy
cross-off
glassy
cross
cross-off
cross-on
on
cross
cross
cross-on
cross
High Tide
11:26PM0.35m
6:39AM0.52m
6:22PM0.49m
12:23PM0.53m
7:29PM0.46m
12:44PM0.60m
10:32PM0.46m
1:06PM0.65m
11:42PM0.51m
1:28PM0.70m
00:20AM0.56m
1:51PM0.73m
00:51AM0.62m
Low Tide
10:47PM0.35m
10:04AM0.46m
3:00PM0.43m
3:12AM0.30m
4:48PM0.43m
4:31AM0.24m
6:10PM0.40m
5:33AM0.18m
6:55PM0.36m
6:23AM0.12m
7:27PM0.33m
7:04AM0.07m
7:55PM0.31m
rain showers
heavy rain
cloud
part cloud
part cloud
light rain
rain showers
part cloud
rain showers
part cloud
clear
clear
part cloud
clear
clear
part cloud
clear
cloud
heavy rain
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
7:01
7:01
7:01
7:00
7:00
6:58
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
5:38
5:39
5:39
5:40
5:40
5:42
 mm
4
13
1
2
1
18
Temp °C
19
19
20
17
16
16
17
18
18
17
20
19
15
17
18
16
22
21
19
Feels °C
21
22
20
17
12
13
16
18
19
17
20
17
14
16
17
14
20
19
21
  • 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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