Surf Forecasts:
Prainha surf forecast from 17 Jul 2026:
- Best quality surf: Friday 17 Jul, 9AM (local time) - 3ft (0.9m), 8s period, E swell with glassy winds.
- Most powerful swell: Saturday 18 Jul, 6PM (local time) - 3.5ft (1.1m), 9s period, E swell with 181 kJ wave energy.
- Next surfable swell (1★+): Friday 17 Jul, 9AM (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 Friday (Jul 17) at 9AM. The primary swell is predicted to be 0.9m and 8s period with a secondary swell of 0.4m and 11s. The wind is predicted to be glassy as the swell arrives.
The most powerful waves expected at Prainha in the next 16 days are 1.1m 9s and forecast to arrive on Saturday (Jul 18) at 6PM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.7m 8s period and expected on Friday (Jul 17) at 9PM.
| Wave Type | Time (-03) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 9AM (Fri 17th Jul) | 3ft (0.9m) 8s |
| Best Surf | 9AM (Fri 17th Jul) | 3ft (0.9m) 8s |
| Most Powerful | 6PM (Sat 18th Jul) | 3.5ft (1.1m) 9s |
Table - best surf conditions forecast for Prainha over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let’s get stuck into the outlook for the next couple of weeks.
We’ve got a long, flat start with nothing really worth paddling out for. The first few days are a tough grind, with small, weak swell and ordinary conditions. The real action doesn’t start to show until the end of July and into the start of August, so you’ll need some patience.
Prainha is the only spot on the radar, and it’s an advanced, exposed break that’s very consistent. The water temperature is sitting at 65°, which is about average for this time of year.
Right now, through the 17th to the 24th of July, it’s a mixed bag of small, waist-high waves and messy winds. The swell is tiny, coming from the East with a short period of 8 seconds. The combined energy is weak, mostly under 174 (moderate wave energy), but the conditions are ordinary. There are a few glassy moments on the morning of the 17th, 19th, and 21st of July, with light offshore or calm winds, but the waves are just too small to get excited about. It’s surfable, but barely.
The 25th of July’s Saturday morning is the first real standout. The wind drops to dead calm, glassy, and a small SSE swell rolls in at 2 ft with a period of 10 seconds. The combined energy jumps to 214 (moderate wave energy). It’s not big, but it’ll be clean and fun for the advanced crew.
The real highlight comes on the 31st of July, Friday morning. We’ve got a solid ESE groundswell at 4 ft, with a very long period of 13 seconds. The wind is glassy, calm, and the combined energy is a whopping 747 (strong wave energy). This is the best on offer, with clean, powerful lines. Because it’s a long-period groundswell, it’ll be better shaped and have more energy, but it might break a bit straight at the beach. Prainha is exposed, so you’ll get the full force.
The 1st of August Saturday morning is also worth a look, with another 4 ft ESE swell and a 14-second period. The combined energy is 668 (strong wave energy), and the wind is clean and cross-offshore. It’s a close second, but the morning of the 31st is the clear winner.
Crowds are listed as “sometimes” at Prainha, so you can expect a few other keen surfers around, especially on those better days.
So, hold out for the 31st of July and the 1st of August. That’s where the magic is.
Rusty.
Short Range ForecastMostly dry. Warm (max 25°C on Sat afternoon, min 15°C on Fri morning). Wind will be generally light. | Days 4-6 Weather SummaryHeavy rain (total 33mm), heaviest during Wed night. Warm (max 26°C on Mon night, min 17°C on Tue night). Wind will be generally light. | ||||||||||||||||||||
Friday 17 | Saturday 18 | Sunday 19 | Monday 20 | Tuesday 21 | Wednesday 22 | Thursday 23 | |||||||||||||||
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) | E 8 | E 8 | ESE 11 | E 8 | E 8 | E 8 | E 8 | S 13 | E 8 | E 8 | ENE 8 | S 11 | E 8 | E 8 | E 8 | E 8 | E 8 | E 8 | E 8 | E 8 | NE 5 |
Wave Graph  | |||||||||||||||||||||
 kJ | 99 | 133 | 22 | 117 | 169 | 165 | 114 | 3 | 169 | 130 | 0 | 2 | 105 | 105 | 88 | 68 | 66 | 64 | 82 | 68 | 60 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | glassy | cross-on | cross | cross | cross-on | cross | glassy | cross-on | cross | cross | cross-on | cross | glassy | cross-on | cross-off | cross-off | glassy | on | cross | cross-on | cross-on |
High Tide | 5:26PM1.15m | 5:07AM1.19m | 6:03PM1.07m | 5:50AM1.14m | 6:40PM1.00m | 6:40AM1.07m | 7:21PM0.93m | 7:41AM0.99m | 8:11PM0.88m | 8:54AM0.93m | 4:18PM0.68m | 9:14PM0.85m | 10:17AM0.93m | 10:25PM0.85m | |||||||
Low Tide | 9:56AM0.09m | 9:50PM0.50m | 10:28AM0.16m | 10:24PM0.46m | 11:02AM0.25m | 11:02PM0.44m | 11:39AM0.36m | 11:46PM0.44m | 12:20PM0.48m | 00:39AM0.47m | 1:13PM0.60m | 1:52AM0.50m | 6:26PM0.63m | ||||||||
 | |  | | | | | | | | | | | |  |  |  |  | | | | |
 | 7:00 | — | — | 6:58 | — | — | 6:58 | — | — | 6:58 | — | — | 6:58 | — | — | 6:58 | — | — | 6:58 | — | — |
 | — | 5:39 | — | — | 5:39 | — | — | 5:40 | — | — | 5:40 | — | — | 5:42 | — | — | 5:42 | — | — | 5:43 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 1 | 3 | 10 | 19 | 3 | 10 | 6 |
Temp °C | 16 | 20 | 20 | 20 | 25 | 23 | 21 | 25 | 22 | 23 | 25 | 26 | 23 | 23 | 20 | 17 | 18 | 18 | 19 | 20 | 19 |
Feels °C | 15 | 20 | 19 | 17 | 24 | 22 | 20 | 23 | 21 | 21 | 22 | 25 | 22 | 21 | 19 | 17 | 20 | 18 | 20 | 20 | 17 |
Swell 1 Height (m) Direction Period (s) | E 8 | E 8 | ENE 8 | E 8 | E 8 | E 8 | E 8 | S 13 | E 8 | E 8 | E 8 | E 8 | E 8 | E 8 | E 8 | E 8 | E 8 | E 8 | E 8 | E 8 | ENE 5 |
| kJ | 99 | 133 | 197 | 117 | 169 | 165 | 114 | 3 | 169 | 130 | 134 | 137 | 105 | 105 | 88 | 68 | 66 | 64 | 82 | 68 | 30 |
Swell 2 Height (m) Direction Period (s) | ESE 11 | ESE 10 | ESE 11 | ESE 10 | SE 10 | SE 10 | — | S 13 | S 12 | — | — | S 11 | S 11 | S 10 | SE 10 | SSE 5 | SSE 4 | SSE 10 | SE 10 | SE 10 | E 8 |
| kJ | 45 | 41 | 22 | 21 | 4 | 4 | — | 3 | 3 | — | — | 2 | 2 | 2 | 4 | 9 | 2 | 10 | 26 | 25 | 34 |
Swell 3 Height (m) Direction Period (s) | — | — | — | S 14 | — | — | SE 14 | — | — | — | — | — | — | — | — | SE 9 | SE 9 | — | — | — | SE 10 |
| kJ | — | — | — | 4 | — | — | 8 | — | — | — | — | — | — | — | — | 3 | 3 | — | — | — | 23 |
Wind waves Height (m) Direction Period (s) | — | — | ENE 8 | — | ENE 8 | — | — | ENE 8 | — | — | ENE 8 | — | — | — | SSE 4 | S 5 | — | NNE 3 | NNW 3 | NNE 3 | NE 5 |
| kJ | — | — | 363 | — | 291 | — | — | 96 | — | — | 250 | — | — | — | 8 | 25 | — | 1 | 4 | 1 | 60 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 0 | 73 | 4 | 4 | 43 | 4 | 0 | 61 | 4 | 4 | 40 | 4 | 0 | 73 | 0 | 0 | 0 | 28 | 4 | 40 | 28 |
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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