Prainha Surf Break

Lat Long: 26.23° S 48.50° W

Prainha Surf Forecast and Surf Report

Issued: 8 pm 18 Aug 2026 (local time)

Forecast update in  hr  min

Today's Prainha sea temperature is
19.5° C
1.1° 

Prainha surf forecast is for near shore open water. Breaking waves will often be smaller at less exposed spots.


Prainha surf forecast from 19 Aug 2026:

  • Best quality surf: Wednesday 19 Aug, 3AM (local time) - 3ft (0.9m), 8s period, E swell with glassy winds.
  • Most powerful swell: Monday 24 Aug, 3PM (local time) - 3.5ft (1.0m), 16s period, SE swell with 462 kJ wave energy.
  • Next surfable swell (1★+): Wednesday 19 Aug, 3AM (local time) - 3ft (0.9m), 8s period with E swell.

Best Forecast Surf Conditions for Prainha this week:

The surf forecast for Prainha over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Wednesday (Aug 19) at 3AM. The primary swell is predicted to be 0.9m and 8s period with a secondary swell of 0.1m and 8s. The wind is predicted to be glassy as the swell arrives.

The most powerful waves expected at Prainha in the next 16 days are 1.0m 16s and forecast to arrive on Monday (Aug 24) at 3PM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.3m 6s period and expected on Wednesday (Aug 26) at 12AM.

Wave TypeTime (-03) & Date Wave Height & Period
Next good surf (1 star+) 3AM (Wed 19th Aug)3ft (0.9m) 8s
Best Surf 3AM (Wed 19th Aug)3ft (0.9m) 8s
Most Powerful 3PM (Mon 24th Aug)3.5ft (1.0m) 16s

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


The Lowdown

Alright, let’s break down what we’ve got coming up at Prainha over the next couple weeks.

Honestly, it’s a rough patch. For a spot that needs a decent south swell and clean wind, we’re seeing a whole lot of nothing. The first week is basically a bust. Tiny swell, bad wind, and low energy. There’s a big gap in quality from now until late in the month.

Wednesday the 19th is flat and messy, with a weak 3ft east swell, short 8-second period, and a moderate breeze. Not worth your time. Thursday the 20th is glassy in the morning but the swell drops to 2ft and the period falls apart. Friday the 21st has a tiny bit of offshore wind but the swell is only 1ft with a 4-second period – that’s barely a ripple.

Saturday the 22nd morning is the first time you could even think about it, but it’s still ordinary. You’ve got a glassy surface, calm wind, and a 2ft southeast swell at 9 seconds. The combined energy is only 70, so it’s weak. Not a standout, just the least bad option so far.

Things get a little more interesting starting Monday the 24th. That morning brings a 3ft southeast swell with a very long 15-second period, and the energy jumps to 318 – that’s moderate. The wind is light and cross-onshore though, so it’s not clean. By the afternoon the swell pushes to 3ft with a 16-second period and energy at 463. That’s a proper groundswell, but the wind is still light cross-onshore, so expect some texture. That long period means better-shaped waves but long lulls. On a beach break like Prainha, it might be a bit too straight.

Tuesday the 25th is glassy both morning and afternoon, with a 2ft southeast swell, 13-second period, and energy around 155. It’s surfable but nothing special. Very ordinary.

The real standout in this whole 16-day window looks like Saturday the 29th of August. The morning has a clean 4ft swell from the south-southeast, a 7-second period, and energy at 279. But the key here is the light offshore wind from the west. That’s going to groom the faces nicely. The wave comment says “expect good surf conditions,” and with the highest score in the whole run, this is the one to circle. It’s still over a week away, so keep an eye on it, but if it holds, it’s your best shot for some proper waves. The swell is moderate size, so it’s fine for experienced surfers but might be a bit much for beginners.

After that, the start of September looks like it slips back into small, weak conditions again, with messy winds. Not much to get excited about.

So, to sum it up: this is a long, lean period. The only real standout is the morning of Saturday the 29th of August. The rest is either flat, windy, or just plain ordinary. But hey, it’s Prainha – it tends to come good eventually.

Rusty.

Short Range Forecast

Mostly dry. Warm (max 25°C on Tue night, min 18°C on Wed afternoon). Wind will be generally light.

Days 5-7 Weather Summary

Mostly dry. Very mild (max 19°C on Fri night, min 14°C on Sat night). Wind will be generally light.

Wednesday
19
Thursday
20
Friday
21
Saturday
22
Sunday
23
Monday
24
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
Rating
(10 max)
0
0
0
1
0
0
1
0
0
1
1
0
0
0
0
0
0
1
0
Swell
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Wave
Height (m)
Direction
Period (s)
0.9
E
8
0.8
E
8
0.8
E
8
0.6
E
8
0.6
E
7
0.3
SE
5
0.6
E
7
0.3
SSE
4
0.6
E
7
1.6
SSE
9
0.6
SE
9
0.6
SE
9
0.4
SE
9
0.4
SE
10
0.4
SE
11
0.4
SE
13
0.8
SE
15
1
SE
16
0.8
SE
14
Wave Graph
Metric surfscale
Energy kJ
111
80
72
42
39
3
37
4
35
432
70
51
26
33
40
60
305
462
238
Wind (km/h)
5
NNW
20
S
20
SSE
10
SSW
5
N
15
NE
10
NW
15
WSW
25
SSW
20
SSE
0
WSW
15
E
10
SE
5
SSE
15
ESE
25
SE
10
SE
10
ESE
15
ENE
Wind State
cross
cross-off
cross
cross-off
glassy
on
cross-off
off
cross-off
cross
glassy
cross-on
cross
cross
cross-on
cross
cross-on
cross-on
on
High Tide
6:57AM0.97m
6:56PM0.85m
8:16AM0.89m
3:35PM0.79m
8:15PM0.78m
4:21AM0.59m
3:08PM0.78m
9:53PM0.78m
11:24AM0.96m
11:16PM0.86m
12:24PM1.07m
00:13AM0.98m
1:05PM1.18m
00:56AM1.11m
Low Tide
11:08PM0.31m
11:29AM0.50m
11:50PM0.37m
12:09PM0.63m
6:01PM0.74m
5:01AM0.59m
1:12PM0.76m
6:41PM0.65m
6:06AM0.46m
7:09PM0.56m
6:44AM0.34m
7:33PM0.48m
7:14AM0.23m
7:53PM0.42m
clear
clear
part cloud
cloud
part cloud
cloud
part cloud
clear
clear
clear
part cloud
clear
cloud
cloud
part cloud
cloud
cloud
cloud
cloud
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
6:39
6:37
6:37
6:37
6:35
6:35
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
5:54
5:55
5:55
5:57
5:57
5:58
 mm
Temp °C
25
20
19
18
20
20
21
21
22
19
16
16
16
15
16
15
15
16
17
Feels °C
27
20
18
18
21
20
20
16
17
16
17
14
15
14
14
11
13
14
15
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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 Prainha Surf forecast

The above surf forecast table for Prainha provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Prainha can be found by selecting the local surf guide option on the grey menu. Our Prainha 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 (Prainha) 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 Prainha 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.

Prainha is 14 km (9 miles) from Sao Francisco do Sul. If you plan a holiday in Santa Catarina - Norte, look for hotels and other accommodation in Sao Francisco do Sul. Sao Francisco do Sul has rooms for a wide range of budgets as well as car hire and transport links.

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