Surf Forecasts:
Prainha surf forecast from 18 Aug 2026:
- Best quality surf: Monday 24 Aug, 3PM (local time) - 2.5ft (0.8m), 15s period, SE swell with glassy winds.
- Most powerful swell: Monday 24 Aug, 12PM (local time) - 2.5ft (0.8m), 15s period, SE swell with 305 kJ wave energy.
- Next surfable swell (1★+): Tuesday 18 Aug, 6AM (local time) - 3.5ft (1.0m), 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 Tuesday (Aug 18) at 6AM. The primary swell is predicted to be 1.0m and 8s period with a secondary swell of 0.2m and 9s. The wind is predicted to be glassy as the swell arrives.
The most powerful waves expected at Prainha in the next 16 days are 0.8m 15s and forecast to arrive on Monday (Aug 24) at 12PM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.7m 8s period and expected on Saturday (Aug 22) at 3PM.
| Wave Type | Time (-03) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 6AM (Tue 18th Aug) | 3.5ft (1.0m) 8s |
| Best Surf | 3PM (Mon 24th Aug) | 2.5ft (0.8m) 15s |
| Most Powerful | 12PM (Mon 24th Aug) | 2.5ft (0.8m) 15s |
Table - best surf conditions forecast for Prainha over the next 16 days.
The Lowdown
Hey, Rusty here, checking in on the Prainha stretch. Let me tell you, the surf forecast is looking a bit thin for the next two weeks.
The first week is mostly a write-off. We've got some weak, short-period windswell out of the east, but the wind is all over the place, keeping things choppy and messy. The water temp is a touch warmer than usual for August, hitting about 67°F.
The one and only real highlight is Tuesday, August 25th. That morning, the stars align. We’ll see a moderate pulse of energy with a combined swell energy of 277, coming from the southeast with a super long 15-second period – that’s proper groundswell. The wave height will be around 3ft, and the wind is forecast to go dead glassy. For an exposed, advanced break like Prainha, that’s about as clean as it gets. It can get a bit crowded here sometimes, so you’ll want to be early for that one.
Before that, you’re mostly looking at tiny, weak waves. There are a few cleaner moments, like the mornings of Wednesday the 19th and Saturday the 22nd, but with only knee-high surf, it’s barely worth paddling out for.
After the 25th, it’s back to the small stuff. The swell fades fast, and we’re looking at ankle-to-knee-high waves with cross-shore breezes right through the end of the month and into September. That Tuesday morning is your only real chance at something decent, and it’s a week out, so keep an eye on it, but it’s the only pulse on the board.
Catch you in the water,
Rusty
Short Range ForecastMostly dry. Warm (max 27°C on Tue afternoon, min 18°C on Wed morning). Wind will be generally light. | Days 5-7 Weather SummaryLight rain (total 2mm), mostly falling on Sat night. Warm (max 23°C on Fri morning, min 14°C on Fri night). Winds decreasing (fresh winds from the SW on Fri afternoon, calm by Sat morning). | ||||||||||||||||||
Tuesday 18 | Wednesday 19 | Thursday 20 | Friday 21 | Saturday 22 | Sunday 23 | ||||||||||||||
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) | E 8 | E 8 | E 8 | E 8 | E 8 | E 8 | E 8 | E 8 | E 7 | E 7 | E 7 | E 7 | E 8 | SE 10 | SE 10 | SE 9 | SE 11 | SE 12 | SE 12 |
Wave Graph  | |||||||||||||||||||
 kJ | 160 | 129 | 136 | 108 | 78 | 72 | 41 | 40 | 40 | 38 | 34 | 53 | 68 | 52 | 57 | 123 | 114 | 116 | 112 |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross | on | cross | cross-off | cross | off | glassy | cross-on | cross | off | off | off | glassy | cross-on | cross | cross-on | cross-on | cross |
High Tide | 6:01AM1.08m | 6:13PM0.94m | 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 | |||||
Low Tide | 10:32PM0.27m | 10:56AM0.37m | 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 | |||||
 |  | | |  | |  | | | | | | | | |  |  |  | | |
 | — | 6:39 | — | — | 6:39 | — | — | 6:37 | — | — | 6:37 | — | — | 6:37 | — | — | 6:35 | — | — |
 | — | — | 5:54 | — | — | 5:54 | — | — | 5:55 | — | — | 5:55 | — | — | 5:57 | — | — | 5:57 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 1 | 1 | — | 1 |
Temp °C | 19 | 25 | 27 | 25 | 20 | 18 | 18 | 19 | 20 | 20 | 23 | 22 | 17 | 16 | 16 | 14 | 14 | 15 | 15 |
Feels °C | 19 | 26 | 28 | 26 | 20 | 16 | 19 | 20 | 20 | 21 | 20 | 17 | 13 | 14 | 14 | 10 | 12 | 14 | 12 |
Swell 1 Height (m) Direction Period (s) | E 8 | E 8 | E 8 | E 8 | E 8 | E 8 | E 8 | E 8 | E 7 | E 7 | E 7 | E 7 | E 8 | E 8 | E 8 | SE 9 | SE 11 | SE 12 | SE 12 |
| kJ | 160 | 129 | 136 | 108 | 78 | 72 | 41 | 40 | 40 | 38 | 34 | 53 | 68 | 52 | 37 | 123 | 114 | 116 | 112 |
Swell 2 Height (m) Direction Period (s) | SSE 9 | SSE 9 | SE 9 | SE 8 | SE 8 | E 13 | SSE 4 | SSE 4 | SE 4 | SE 6 | SE 5 | S 8 | SE 10 | SE 10 | ENE 8 | ENE 8 | ENE 8 | E 8 | E 8 |
| kJ | 8 | 8 | 3 | 3 | 3 | 3 | 7 | 2 | 1 | 1 | 1 | 5 | 23 | 47 | 75 | 22 | 12 | 4 | 5 |
Swell 3 Height (m) Direction Period (s) | — | — | S 9 | E 14 | S 9 | E 13 | E 13 | S 11 | E 12 | SE 11 | E 11 | SE 6 | — | — | — | — | — | — | — |
| kJ | — | — | 2 | 4 | 2 | 3 | 3 | 2 | 3 | 5 | 2 | 1 | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | — | — | — | — | — | SSE 3 | — | — | — | NE 4 | SSW 2 | — | SSE 4 | WSW 2 | SE 10 | — | — | — | — |
| kJ | — | — | — | — | — | 3 | — | — | — | 14 | 1 | — | 5 | 1 | 57 | — | — | — | — |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 4 | 4 | 54 | 4 | 0 | 129 | 0 | 11 | 73 | 4 | 33 | 0 | 0 | 0 | 990 | 91 | 61 | 28 | 62 |
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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