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Surf Forecasts:

Siriu surfForecast / Santa Catarina – Sul / Brazil

information circle12 Day Weather and Surf, issued 8 pm Sunday 18 Jan 2026 -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
25.8° C
 (Which is normal for this time of year)

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 Tuesday (Jan 20) at 12AM. The primary swell is predicted to be 2.2m and 8s period with a secondary swell of 1.9m and 8s. Another secondary swell of 0.4m and 8s 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 12 days are 2.5m 8s and forecast to arrive on Monday (Jan 19) at 9PM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.1m 5s period and expected on Monday (Jan 19) at 3AM.

Wave TypeTime (-03) & Date Wave Height & Period
Next good surf (1 star+)12AM (Tue 20th Jan)7ft (2.2m) 8s
Best Surf12AM (Tue 20th Jan)7ft (2.2m) 8s
Most Powerful 9PM (Mon 19th Jan)8ft (2.5m) 8s

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

Updates in  hr  min  s Forecast update imminent 
12 DaysHourly
Print Table

Short Range Forecast Heavy rain (total 27mm), heaviest during Sun night. Warm (max 24°C on Wed morning, min 18°C on Mon night). Winds decreasing (fresh winds from the SSW on Sun night, light winds from the ENE by Tue night).

Days 3-6 Weather Summary Mostly dry. Warm (max 26°C on Sat morning, min 18°C on Thu night). Wind will be generally light.

Monday
19
Tuesday
20
Wednesday
21
Thursday
22
Friday
23
Saturday
24
Sun
25
NightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPM
Rating
(10 max)
0
1
2
4
2
0
1
1
0
1
1
0
2
2
0
2
1
0
0
0
0
Swell
Height Map
See all maps
Wave Height (m) & direction (?)
0.9
ENE
1.7
S
2.2
SSE
2.2
S
1.3
SE
1.3
SE
1.1
SE
1.1
SE
1.3
SE
1.4
SE
1.3
SE
1.2
SE
1.1
SE
1.3
E
1.2
E
1.1
E
0.9
ESE
0.9
ENE
0.8
E
0.8
ENE
0.7
E
Period(s) (?)87881088891010101088888888
Wave
Graph
(?)Metric surfscale
Energy kJ (?)99274585675327198169177269384369304234224182145112104768358
Wind
(km/h)
20
SSW
25
SSW
30
SSW
15
SSW
15
SSW
20
SSE
10
E
10
ENE
20
ENE
15
NE
5
E
15
E
0
SE
0
E
15
ESE
5
WNW
10
NNE
25
ENE
20
N
15
N
30
NE
Wind State (?)
onshore
cross-onshore
cross-shore
cross-offshore
offshore
glassy
cross-
off		cross-
off		cross-
off		cross-
off		cross-
off		cross-
on		oncross-
on		oncross-
on		ononglassglasscross-
on		cross-
off		cross-
on		cross-
on		crosscrosscross-
on
High Tide
/ height (m)
2:50AM
0.77
2:03PM
0.72
3:16AM
0.76
2:34PM
0.76
3:44AM
0.74
3:07PM
0.77
4:13AM
0.70
3:42PM
0.75
4:44AM
0.65
4:21PM
0.71
5:17AM
0.59
5:06PM
0.65
5:52AM 10:53AM
0.52 0.42
Low Tide
/ height (m)
9:09AM
0.29
9:10PM
-0.03
9:40AM
0.31
9:48PM
-0.02
10:13AM
0.32
10:28PM
0.01
10:51AM
0.34
11:12PM
0.07
11:34AM
0.36
12:05AM
0.16
12:30PM
0.38
1:16AM
0.25
9:32AM
0.41
1:43PM
0.38
Monday
19
Tuesday
20
Wednesday
21
Thursday
22
Friday
23
Saturday
24
Sun
25
Sunrise-5:35--5:35--5:35--5:37--5:37--5:39--5:39-
Sunset--7:14--7:14--7:14--7:13--7:13--7:13--7:12
thunderstorm
rain showers
light rain
part cloud
part cloud
clear
rain showers
part cloud
clear
part cloud
clear
clear
part cloud
clear
clear
clear
clear
clear
clear
clear
clear
Rain (mm)
2132---1--------------
Temp. °C232321202323212423212424222424212626223129
Feels °C (?)252017172120202120202222232423232524222927
  • 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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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.

View detailed surf forecast for Siriu at:
surf-forecast.com

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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