Siriu Surf Forecast

/ Santa Catarina – Sul (37 surf breaks) /

Brazil (447 surf breaks) / Lat Long: (28.00° S 48.63° W)

Surf Forecasts:

Siriu surfForecast / Santa Catarina – Sul / Brazil

12 Day Weather and Surf, issued 8 pm Monday 15 Sep 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 18.5° 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 Tuesday (Sep 16) at 3AM. The primary swell is predicted to be 1.9m and 13s period. 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 2.0m 13s and forecast to arrive on Wednesday (Sep 17) 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 0.7m 4s period and expected on Friday (Sep 19) at 9AM.

Wave Type	Time (-03) & Date	Wave Height & Period
Next good surf (1 star+)	3AM (Tue 16th Sep)	6ft (1.9m) 13s
Best Surf	3AM (Tue 16th Sep)	6ft (1.9m) 13s
Most Powerful	6AM (Wed 17th Sep)	6.5ft (2.0m) 13s

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

Updates in hr min s Forecast update imminent

12 Days Hourly

Print Table

	Short Range Forecast Light rain (total 4mm), mostly falling on Mon night. Warm (max 22°C on Thu morning, min 17°C on Mon night). Wind will be generally light.										Days 3-6 Weather Summary Light rain (total 4mm), mostly falling on Sun morning. Warm (max 31°C on Sat afternoon, min 17°C on Thu night). Wind will be generally light.
		Tuesday 16			Wednesday 17			Thursday 18			Friday 19			Saturday 20			Sunday 21			Mon 22
	Night	AM	PM	Night	AM	PM	Night	AM	PM	Night	AM	PM	Night	AM	PM	Night	AM	PM	Night	AM	PM
Rating (10 max)	2	4	2	4	3	1	3	3	1	2	0	0	2	1	2	2	1	1	1	1	1
Swell Height Map See all maps
Wave Height (m) & direction (?)	ESE	ESE	ESE	ESE	ESE	ESE	E	E	E	ENE	E	ENE	ENE	ENE	ENE	ENE	ENE	ENE	ENE	ENE	ENE
Period(s) (?)	13	13	14	13	9	9	10	10	9	9	9	9	10	9	9	9	9	9	9	9	9
Wave Graph (?)
Energy (?)	1303	1222	1261	1093	861	888	914	813	720	915	361	495	629	419	426	455	367	312	374	370	374
Wind (km/h)	N	NNW	SSE	SSW	SSW	SE	NE	ESE	ENE	N	NNE	NE	N	NNE	W	NNW	NNE	S	NNE	SW	SW
Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy	cross	cross- off	cross- on	cross- off	cross- off	cross- on	glass	glass	on	cross	cross	cross- on	cross	cross	off	cross- off	cross	cross	cross	cross- off	cross- off
High Tide / height (m)	12:19AM 0.36		1:02PM 0.75	12:11AM 0.43		1:24PM 0.75	11:51PM 0.52		1:36PM 0.74	12:00AM 0.62		1:37PM 0.72	12:25AM 0.70		1:37PM 0.71	12:54AM 0.76		1:45PM 0.71	1:24AM 0.80		1:59PM 0.70
Low Tide / height (m)	9:31PM 0.31	4:29AM 0.19		9:03PM 0.39	5:28AM 0.11		6:48PM 0.38	6:13AM 0.05		7:00PM 0.35	6:51AM 0.01		7:19PM 0.31	7:24AM -0.01		7:40PM 0.27	7:54AM 0.01		7:59PM 0.23	8:21AM 0.05

		Tuesday 16			Wednesday 17			Thursday 18			Friday 19			Saturday 20			Sunday 21			Mon 22
Sunrise	-	6:11	-	-	6:09	-	-	6:09	-	-	6:07	-	-	6:07	-	-	6:05	-	-	6:03	-
Sunset	-	-	6:07	-	-	6:07	-	-	6:07	-	-	6:08	-	-	6:08	-	-	6:08	-	-	6:09

Rain (mm)	4	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	3	1	36	41	9
Temp. °C	18	21	20	18	21	20	18	22	22	19	25	25	21	29	31	23	23	21	20	16	16
Feels °C (?)	17	22	20	18	20	20	18	22	22	20	22	22	21	28	31	25	24	21	23	13	13

Map Icons:
Break
Live Wave Height (m)
Live Wind Speed (km/h)
Surf Rating (10 Max)
Ocean Swells (m)
Wind Speed (km/h)

Recent Eyeball Surf Reports for Santa Catarina - Sul

Wind Update The wind is still cross-off at Siriu (light winds from the N at Florianopolis Airport 38 km from Siriu). A 2.1m groundswell from the ESE is too big for here
2 hours 27 minutes ago Siriu

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38 km away, 2 h 27 min ago

17 km/h

0.0

18.5

Air / Water (°C)

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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.