Siriu surfForecast / Santa Catarina – Sul / Brazil

information circle12 Day Weather and Surf, issued 8 am Thursday 16 Oct 2025 -03
Forecast update in hr  min  s Forecast update imminent
Siriu surf forecast is for near shore open water. Breaking waves will often be smaller at less exposed spots.
Today's Siriu sea temperature is
20.2° C
(Which is slightly cooler than normal)


Best Forecast Surf Conditions for Siriu this week:

The surf forecast for Siriu over the next 12 days: The first swell (rated 1 star or higher) is forecast to arrive on Friday (Oct 17) at 6PM. The primary swell is predicted to be 1.2m and 5s period with a secondary swell of 0.8m and 5s. Another secondary swell of 0.6m and 8s is also forecast. The wind is predicted to be glassy as the swell arrives.

The most powerful waves expected at Siriu in the next 12 days are 2.3m 8s and forecast to arrive on Sunday (Oct 19) at 6AM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.4m 3s period and expected on Saturday (Oct 18) at 6AM.

Wave TypeTime (-03) & Date Wave Height & Period
Next good surf (1 star+) 6PM (Fri 17th Oct)4ft (1.2m) 5s
Best Surf 9PM (Sun 19th Oct)6.5ft (2.0m) 8s
Most Powerful 6AM (Sun 19th Oct)7.5ft (2.3m) 8s

Table - best surf conditions forecast for Siriu over the next 12 days.

Updates in  hr  min  s Forecast update imminent

Short Range Forecast Heavy rain (total 47mm), heaviest during Fri afternoon. Warm (max 23°C on Fri morning, min 15°C on Sat night). Winds increasing (calm on Fri afternoon, fresh winds from the S by Sat night).

Days 3-6 Weather Summary Light rain (total 9mm), mostly falling on Sun morning. Very mild (max 19°C on Tue morning, min 15°C on Sun night). Wind will be generally light.

Thursday
16
Friday
17
Saturday
18
Sunday
19
Monday
20
Tuesday
21
Wednesday
22
AMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNight
Rating
(10 max)
0
0
0
0
0
1
1
1
2
3
1
1
1
0
1
0
0
0
0
0
2
Swell
Height Map
Wave Height (m) & direction (?)
0.9
E
0.8
E
0.7
E
0.7
E
0.6
E
0.6
E
0.8
ENE
1.5
SSE
2.2
SSE
2
S
1.6
SSE
1.2
ESE
1.4
SSE
1.2
S
1.3
ESE
1.2
E
1.5
ENE
1.7
E
2.1
E
2.2
ENE
2.1
ENE
Period(s) (?)99888887888910107677888
Wave
Graph
(?)Metric surfscale
Energy kJ (?)127966864454379211528539291222402279152109181295523542495
Wind
(km/h)
20
NNE
20
NNE
15
NNE
10
NNE
15
NNE
5
SW
15
SW
30
SSW
30
SSW
25
S
20
S
15
SSE
15
ESE
10
E
10
NE
20
NE
25
NE
25
NE
25
NE
25
NE
20
N
Wind State (?)
onshore
cross-onshore
cross-shore
cross-offshore
offshore
glassy
crosscross-
on
crosscross-
on
crossglasscross-
off
cross-
off
cross-
off
cross-
off
crosscrosscross-
on
oncross-
on
cross-
on
cross-
on
cross-
on
cross-
on
cross-
on
cross
High Tide
/ height (m)
12:52PM
0.70
11:16PM
0.55
12:53PM
0.68
11:38PM
0.64
12:47PM
0.68
12:07AM
0.71
12:50PM
0.68
12:38AM
0.76
1:03PM
0.69
1:10AM
0.78
1:20PM
0.68
1:42AM
0.79
1:39PM
0.67
2:14AM
0.78
Low Tide
/ height (m)
5:56PM
0.39
5:43AM
0.09
6:14PM
0.32
6:20AM
0.07
6:38PM
0.26
6:53AM
0.08
7:01PM
0.20
7:24AM
0.10
7:23PM
0.16
7:52AM
0.15
7:43PM
0.13
8:19AM
0.20
8:01PM
0.10
Thursday
16
Friday
17
Saturday
18
Sunday
19
Monday
20
Tuesday
21
Wednesday
22
Sunrise5:37--5:35--5:35--5:33--5:33--5:31--5:31--
Sunset-6:22--6:22--6:23--6:23--6:24--6:25--6:25-
cloud
cloud
part cloud
cloud
heavy rain
heavy rain
mod rain
light rain
rain showers
rain showers
rain showers
rain showers
part cloud
clear
part cloud
rain showers
rain showers
rain showers
part cloud
part cloud
clear
Rain (mm)
----1417637112---122---
Temp. °C222219232120201917181816181818191918212118
Feels °C (?)192119232223201612141313151515151515171715
  • Map Icons:
  • Break
  • Live Wave Height (m)
  • Live Wind Speed (km/h)
  • Surf Rating (10 Max)
  • Ocean Swells (m)
  • Wind Speed (km/h)
Map placeholder

Eyeball surf reportRecent Eyeball Surf Reports for Santa Catarina - Sul

  1. weather stationWind Update The wind is still cross-off at Siriu (moderate winds from the N at Florianopolis Airport 38 km from Siriu). 1.0m 4s local chop from the NE with a 0.9m 9s swell from the E and a 0.6m 8s swell from the S. 3 swells combining so expect closeout sets.

    Siriu
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38 km away, 2 h 32 min ago

26 km/h
N
0.0
20.2
Air / Water (°C)
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FREE! Surf-Forecast.com widget for your website

The surf report / weather widget below is available to embed on third party websites free of charge and provides a summary of our Siriu surf forecast. Simply grab the html code snippet that we provide and paste it into your own site. You can choose your preferred language and metric/imperial units for the surf forecast feed to suit users of your site. Click here to get the code.


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 12 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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