Surf Forecasts:
Prainha surf forecast from 25 Aug 2026:
- Best quality surf: Wednesday 26 Aug, 3AM (local time) - 1.5ft (0.5m), 16s period, SE swell with glassy winds.
- Most powerful swell: Thursday 27 Aug, 12AM (local time) - 3.5ft (1.0m), 15s period, SE swell with 438 kJ wave energy.
- Next surfable swell (1★+): Tuesday 25 Aug, 3AM (local time) - 2ft (0.6m), 14s 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 (Aug 25) at 3AM. The primary swell is predicted to be 0.6m and 14s period with a secondary swell of 0.1m and 7s. 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 15s and forecast to arrive on Thursday (Aug 27) at 12AM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.8m 8s period and expected on Saturday (Aug 29) at 12AM.
| Wave Type | Time (-03) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 3AM (Tue 25th Aug) | 2ft (0.6m) 14s |
| Best Surf | 3AM (Wed 26th Aug) | 1.5ft (0.5m) 16s |
| Most Powerful | 12AM (Thu 27th Aug) | 3.5ft (1.0m) 15s |
Table - best surf conditions forecast for Prainha over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let’s have a look at what’s on offer.
Alright, this stretch starts off quiet and builds slowly. We’ve got a few days of tiny, glassy waves early on that are really just for getting wet, nothing to get excited about. The real standout window doesn’t show up until we’re into September.
For this forecast, the main spot is Prainha. It’s an advanced-level break that’s very consistent, exposed to the south swell, and it works best when the swell is coming from the south. The water temp is around average for this time of year, so nothing unusual there.
Tuesday the 25th of August kicks off with knee-high 2ft swell out of the southeast, with a long 13-second period. The wind is glassy, dead calm. The energy is weak (141), so it’s just small and clean for a solo log session.
Wednesday the 26th of August morning is where it first gets interesting. We’ve got 3ft of southeast swell with a very long 16-second period, and clean offshore wind from the west-southwest. The energy jumps to moderate (348). This is proper groundswell, which will wrap in nicely. Because the period is so long, it might be a little straight at the beach, but Prainha handles that kind of energy well. Thursday morning the 27th of August is similar: 3ft, 14-second southeast groundswell, glassy conditions, and moderate energy (318). Clean again.
Thursday afternoon and into Friday the 28th the wind turns messy, and we get a drop in period to a short 7-8 seconds, which kills the quality. The energy numbers drop, and the surf gets choppy and ordinary. This sloppy trend continues through the weekend, with mostly poor conditions and onshore winds.
Now, heads up for the week of Monday the 31st of August. That morning we get clean 3ft waves with offshore wind, and the energy is low (119). It’s rideable but unremarkable. Tuesday the 1st of September gets blown out with strong cross-shore wind, so don’t bother.
The true highlight is the window around Tuesday the 8th of September. Tuesday morning the 8th brings 4ft of east swell with a 9-second period and a good offshore wind from the west. The energy is strong (253), and it’s clean with a gentle offshore breeze. That afternoon? Even better – 4ft swell, the wind goes dead glassy, and the period stretches to 10 seconds with strong energy (275). This is your best bet of the whole outlook: shoulder-high, clean, and lined up. Wednesday the 9th of September morning still has some clean 3ft waves left over, but the energy drops back to moderate (143).
So overall, the first week is mostly small and a few days are blown out. The standout is Tuesday the 8th of September. Get on it.
- Rusty
Short Range ForecastSome drizzle, heaviest during Wed afternoon. Warm (max 20°C on Thu afternoon, min 14°C on Tue morning). Wind will be generally light. | Days 5-7 Weather SummaryMostly dry. Warm (max 22°C on Sat morning, min 19°C on Thu night). Wind will be generally light. | ||||||||||||||||||
Tuesday 25 | Wednesday 26 | Thursday 27 | Friday 28 | Saturday 29 | Sunday 30 | ||||||||||||||
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 14 | SE 13 | SE 13 | SE 16 | SE 16 | SE 15 | SE 15 | SE 14 | SE 13 | SE 13 | E 7 | E 8 | E 8 | E 8 | E 9 | E 9 | E 9 | E 9 | E 9 |
Wave Graph | |||||||||||||||||||
195 | 140 | 104 | 73 | 348 | 421 | 438 | 293 | 176 | 104 | 131 | 187 | 201 | 165 | 215 | 192 | 126 | 96 | 130 | |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | glassy | glassy | cross-off | off | cross-on | cross-on | glassy | cross-on | cross-on | cross | cross-on | glassy | glassy | cross | cross-off | cross-off | glassy | glassy |
High Tide | 00:56AM1.11m | 1:41PM1.28m | 1:33AM1.23m | 2:15PM1.34m | 2:09AM1.33m | 2:48PM1.38m | 2:43AM1.39m | 3:22PM1.39m | 3:19AM1.41m | 3:55PM1.35m | 3:56AM1.39m | 4:30PM1.28m | |||||||
Low Tide | 7:40AM0.13m | 8:09PM0.38m | 8:02AM0.05m | 8:20PM0.34m | 8:21AM0.00m | 8:29PM0.31m | 8:40AM-0.03m | 8:43PM0.27m | 9:01AM-0.02m | 9:03PM0.24m | 9:26AM0.02m | 9:28PM0.22m | |||||||
— | 6:33 | — | — | 6:33 | — | — | 6:31 | — | — | 6:31 | — | — | 6:30 | — | — | 6:28 | — | — | |
— | — | 5:58 | — | — | 5:58 | — | — | 5:59 | — | — | 5:59 | — | — | 6:00 | — | — | 6:00 | — | |
mm | — | — | — | — | — | 1 | — | — | — | — | — | — | — | — | — | — | — | — | 1 |
Temp °C | 16 | 15 | 16 | 17 | 17 | 18 | 19 | 18 | 20 | 20 | 20 | 20 | 21 | 22 | 20 | 19 | 20 | 21 | 20 |
Feels °C | 15 | 15 | 17 | 17 | 18 | 18 | 20 | 20 | 20 | 19 | 21 | 20 | 21 | 25 | 19 | 19 | 22 | 23 | 23 |
Swell 1 Height (m) Direction Period (s) | SE 14 | SE 13 | SE 13 | SE 12 | SE 16 | SE 15 | SE 15 | SE 14 | SE 13 | E 6 | E 7 | E 8 | E 8 | E 8 | E 9 | E 9 | E 9 | E 9 | E 9 |
195 | 140 | 104 | 73 | 348 | 421 | 438 | 293 | 176 | 51 | 131 | 187 | 201 | 165 | 215 | 192 | 126 | 96 | 130 | |
Swell 2 Height (m) Direction Period (s) | E 7 | E 6 | E 6 | SE 16 | ENE 4 | ENE 5 | ENE 5 | E 6 | E 6 | SE 13 | SE 12 | SE 12 | SE 11 | SE 10 | SE 10 | SE 11 | SSE 4 | SE 10 | SE 10 |
1 | 1 | 1 | 66 | 3 | 7 | 10 | 25 | 27 | 104 | 51 | 21 | 5 | 4 | 4 | 4 | 2 | 4 | 4 | |
Swell 3 Height (m) Direction Period (s) | — | — | — | ENE 3 | — | — | — | — | — | — | — | — | — | — | — | — | SE 10 | — | S 6 |
— | — | — | 1 | — | — | — | — | — | — | — | — | — | — | — | — | 4 | — | 1 | |
Wind waves Height (m) Direction Period (s) | — | — | — | ENE 3 | — | — | ENE 5 | — | — | — | — | E 8 | ENE 8 | — | SSE 3 | — | — | SSE 4 | — |
— | — | — | 4 | — | — | 23 | — | — | — | — | 341 | 450 | — | 7 | — | — | 6 | — | |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 52 | 0 | 0 | 0 | 0 | 4 | 4 | 0 | 73 | 40 | 4 | 4 | 0 | 0 | 128 | 0 | 0 | 0 | 0 |
Best forecast wave conditions in Santa Catarina - Norte | |||||||||||||||||||
Best forecast wave conditions in Brazil | |||||||||||||||||||
Header Global | |||||||||||||||||||
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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.











