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Surf Forecasts:

Siriu surfForecast / Santa Catarina – Sul / Brazil

information circle12 Day Weather and Surf, issued 8 pm Saturday 17 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 Sunday (Jan 18) at 3AM. The primary swell is predicted to be 1.0m and 8s period with a secondary swell of 0.2m and 6s. 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 1.3m 6s period and expected on Monday (Jan 19) at 3AM.

Wave TypeTime (-03) & Date Wave Height & Period
Next good surf (1 star+) 3AM (Sun 18th Jan)3.5ft (1.0m) 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 22mm), heaviest during Sun afternoon. Warm (max 27°C on Sun morning, min 19°C on Mon night). Winds increasing (calm on Sun morning, fresh winds from the S by Mon afternoon).

Days 3-6 Weather Summary Some drizzle, heaviest during Fri afternoon. Warm (max 25°C on Thu morning, min 19°C on Tue night). Wind will be generally light.

Sunday
18
Monday
19
Tuesday
20
Wednesday
21
Thursday
22
Friday
23
Sat
24
NightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPM
Rating
(10 max)
1
1
0
0
0
1
4
2
0
1
1
0
2
2
0
2
2
1
1
1
0
Swell
Height Map
See all maps
Wave Height (m) & direction (?)
1
ENE
1
ENE
1
ENE
0.9
ENE
1.7
S
2.2
SSE
2.2
S
1.7
SSE
1.2
SE
1.3
SE
1.3
SE
1.3
SE
1.5
SE
1.5
SE
1.5
SE
1.2
SSE
1
SSE
1.4
SE
1.3
SSE
1.3
SE
1.6
SE
Period(s) (?)888878888810910121110109978
Wave
Graph
(?)Metric surfscale
Energy kJ (?)12712712094266526612376177193320314433583534294200360280151283
Wind
(km/h)
10
NNW
5
S
10
SE
25
SW
30
S
30
S
20
S
15
SSW
20
SSE
10
ENE
10
NE
25
NE
15
NNE
10
NNE
20
ENE
5
NW
5
SSE
15
ESE
15
SE
15
SSE
20
SE
Wind State (?)
onshore
cross-onshore
cross-shore
cross-offshore
offshore
glassy
cross-
off		glasscross-
on		cross-
off		crosscross-
off		cross-
off		cross-
off		cross-
on		cross-
on		cross-
on		cross-
on		crosscross-
on		oncross-
off		glassoncross-
on		crosscross-
on
High Tide
/ height (m)
2:25AM
0.76
1:34PM
0.68
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
Low Tide
/ height (m)
8:39AM
0.29
8:33PM
-0.02
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
Sunday
18
Monday
19
Tuesday
20
Wednesday
21
Thursday
22
Friday
23
Sat
24
Sunrise-5:33--5:35--5:35--5:35--5:37--5:37--5:39-
Sunset--7:14--7:14--7:14--7:14--7:13--7:13--7:13
thunderstorm
clear
thunderstorm
thunderstorm
rain showers
rain showers
part cloud
part cloud
part cloud
part cloud
part cloud
clear
clear
clear
clear
clear
clear
rain showers
rain showers
clear
clear
Rain (mm)
1-51033-----------13--
Temp. °C242726232321202323212424212524222525222424
Feels °C (?)262829242017162120202120192322232626222222
  • 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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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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