Surf Forecasts:
Prainha surf forecast from 15 Sep 2026:
- Best quality surf: Monday 21 Sep, 12AM (local time) - 4.5ft (1.4m), 9s period, E swell with glassy winds.
- Most powerful swell: Monday 21 Sep, 3AM (local time) - 4.5ft (1.4m), 9s period, E swell with 306 kJ wave energy.
- Next surfable swell (1★+): Tuesday 15 Sep, 6AM (local time) - 2ft (0.6m), 9s period with SE 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 Tuesday (Sep 15) at 6AM. The primary swell is predicted to be 0.6m and 9s period with a secondary swell of 0.3m and 8s. The wind is predicted to be offshore as the swell arrives.
The most powerful waves expected at Prainha in the next 16 days are 1.4m 9s and forecast to arrive on Monday (Sep 21) at 3AM. Winds are predicted to be glassy at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 2.2m 8s period and expected on Sunday (Sep 20) at 9AM.
| Wave Type | Time (-03) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 6AM (Tue 15th Sep) | 2ft (0.6m) 9s |
| Best Surf | 12AM (Mon 21st Sep) | 4.5ft (1.4m) 9s |
| Most Powerful | 3AM (Mon 21st Sep) | 4.5ft (1.4m) 9s |
Table - best surf conditions forecast for Prainha over the next 16 days.
The Lowdown
Alright, Rusty here. Let’s have a look at what’s on the table for the next couple of weeks.
Right off the bat, I gotta be straight with you – the next several days are looking pretty grim. We’ve got a real flat spell on our hands with a lot of onshore junk and barely a ripple to get excited about. From Tuesday the 15th right through until Sunday the 20th, it’s mostly small, weak, and messy. There are a few moments of glass, like Tuesday morning and Thursday morning, but the swell is tiny – 2 ft from the southeast with a combined energy of just 121 (weak), and it’s just not enough to get the heart pumping. The water temp is about average for this time of year, so no surprises there.
Then, things start to look up. Monday the 21st of September is where it’s at. That morning at Prainha we’ve got clear skies, glassy conditions, and a clean 4 ft easterly swell with a period of 9 seconds. The combined energy jumps to 226 (moderate), and the wind is dead calm – that’s the kind of morning you set the alarm for. The swell direction is from the east, and the guidance says this spot loves swell from the south, so it’s not a perfect match, but with glass like that and waves in the chest-to-head high range, it’s the best window in the whole forecast. This is an advanced wave, so it’s not for the groms, and crowds are possible here – expect company if you paddle out.
There’s a little bump again on Monday afternoon, but the wind swings onshore and it gets blown out. Tuesday the 22nd is another glassy start, but the swell drops back to 3 ft with only 118 combined energy – surfable, but nothing special. Wednesday the 23rd morning stays clean with a light offshore feel, but again, small.
Now, looking further out, there’s a bit of a pulse trying to build around the 27th and 28th, with a 4 ft swell on Sunday the 27th morning, but the wind is cross-onshore and it’s choppy. Not worth the drive. Monday the 28th afternoon shows 3 ft from the southeast with clean conditions, but the energy is only 129 (weak) – it’s a maybe, but not a standout.
Honestly, if you’re keen, Monday morning the 21st is your best bet. Glassy, clean, and a decent push of swell. After that, it’s a waiting game.
Rusty.
Short Range ForecastLight rain (total 4mm), mostly falling on Tue night. Very mild (max 19°C on Thu afternoon, min 15°C on Tue morning). Wind will be generally light. | Days 4-6 Weather SummaryHeavy rain (total 73mm), heaviest during Sat afternoon. Warm (max 20°C on Sun morning, min 18°C on Fri morning). Wind will be generally light. | ||||||||||||||||||||
Tuesday 15 | Wednesday 16 | Thursday 17 | Friday 18 | Saturday 19 | Sunday 20 | Monday 21 | |||||||||||||||
AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | |
Swell Height Map |  |  |  |  |  |  |  | ||||||||||||||
Wave Height (m) Direction Period (s) | SE 9 | SE 9 | SE 12 | SSE 6 | E 7 | SE 10 | SE 10 | ESE 7 | SE 12 | ENE 6 | E 6 | E 7 | E 7 | SE 14 | SSE 13 | ENE 8 | E 8 | E 9 | E 9 | E 9 | E 9 |
Wave Graph  | |||||||||||||||||||||
 kJ | 51 | 46 | 42 | 51 | 38 | 85 | 46 | 17 | 27 | 104 | 109 | 131 | 139 | 7 | 16 | 0 | 264 | 292 | 224 | 180 | 184 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | glassy | cross-on | cross | cross | cross-on | cross-on | glassy | cross-on | on | on | on | on | cross-on | on | cross-on | cross | cross-on | glassy | glassy | on | cross-off |
High Tide | 4:46PM1.03m | 5:29AM1.08m | 5:05PM0.94m | 6:25AM0.96m | 3:17PM0.86m | 7:47AM0.87m | 2:57PM0.84m | 7:29PM0.75m | 3:37AM0.60m | 2:39PM0.82m | 9:26PM0.76m | 11:01AM0.96m | 10:50PM0.87m | 11:56AM1.08m | 11:46PM1.02m | ||||||
Low Tide | 9:52AM0.29m | 10:01PM0.16m | 10:20AM0.40m | 10:35PM0.22m | 10:50AM0.52m | 11:13PM0.32m | 11:26AM0.65m | 6:08PM0.74m | 4:56AM0.59m | 12:22PM0.78m | 6:24PM0.64m | 5:48AM0.45m | 6:44PM0.55m | 6:22AM0.32m | 7:04PM0.46m | ||||||
 |  |  | | |  | | | |  | |  |  | |  |  | |  | | | | |
 | 6:11 | — | — | 6:09 | — | — | 6:09 | — | — | 6:07 | — | — | 6:07 | — | — | 6:05 | — | — | 6:05 | — | — |
 | — | 6:07 | — | — | 6:07 | — | — | 6:07 | — | — | 6:07 | — | — | 6:07 | — | — | 6:08 | — | — | 6:08 | — |
mm | — | — | 1 | — | — | — | — | — | 3 | 2 | 2 | 9 | 11 | 11 | 17 | — | 14 | 7 | — | — | 1 |
Temp °C | 17 | 17 | 17 | 16 | 17 | 17 | 18 | 19 | 18 | 19 | 19 | 19 | 18 | 19 | 19 | 20 | 19 | 20 | 24 | 22 | 20 |
Feels °C | 17 | 15 | 15 | 15 | 15 | 14 | 17 | 18 | 16 | 17 | 17 | 17 | 16 | 17 | 17 | 21 | 21 | 22 | 26 | 23 | 22 |
Swell 1 Height (m) Direction Period (s) | SE 9 | SE 9 | E 7 | SE 6 | E 7 | ESE 7 | SE 10 | ESE 4 | E 4 | E 6 | SSE 10 | E 7 | SE 9 | SE 14 | SSE 8 | E 8 | E 8 | E 9 | E 9 | E 9 | E 9 |
| kJ | 51 | 46 | 27 | 36 | 38 | 41 | 46 | 8 | 13 | 52 | 10 | 131 | 3 | 7 | 14 | 341 | 264 | 292 | 224 | 180 | 184 |
Swell 2 Height (m) Direction Period (s) | E 8 | E 8 | SSE 13 | E 7 | SE 8 | SE 9 | E 7 | ESE 7 | SE 12 | SSE 10 | ESE 10 | SSE 9 | S 14 | SE 13 | SSE 13 | — | — | S 12 | S 10 | S 10 | S 10 |
| kJ | 21 | 29 | 16 | 25 | 32 | 22 | 17 | 17 | 22 | 11 | 10 | 8 | 4 | 7 | 16 | — | — | 3 | 2 | 2 | 2 |
Swell 3 Height (m) Direction Period (s) | E 8 | — | SE 12 | SE 12 | E 12 | SSE 13 | E 11 | ESE 11 | E 7 | ESE 10 | — | — | — | — | — | — | — | — | — | — | — |
| kJ | 49 | — | 39 | 22 | 3 | 17 | 10 | 12 | 4 | 10 | — | — | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | — | — | SE 8 | SSE 6 | — | SE 10 | — | ENE 4 | ENE 4 | ENE 6 | E 6 | ENE 7 | E 7 | ENE 7 | ENE 8 | ENE 8 | ENE 8 | — | — | — | — |
| kJ | — | — | 42 | 51 | — | 85 | — | 5 | 27 | 104 | 109 | 225 | 139 | 225 | 355 | 650 | 541 | — | — | — | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 0 | 73 | 61 | 52 | 235 | 91 | 0 | 128 | 73 | 128 | 152 | 156 | 73 | 173 | 59 | 4 | 4 | 0 | 0 | 128 | 0 |
Best forecast wave conditions in Santa Catarina - Norte | |||||||||||||||||||||
Best forecast wave conditions in Brazil | |||||||||||||||||||||
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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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