Surf Forecasts:
Prainha surf forecast from 17 Aug 2026:
- Best quality surf: Tuesday 18 Aug, 9AM (local time) - 3.5ft (1.0m), 8s period, E swell with glassy winds.
- Most powerful swell: Monday 24 Aug, 3AM (local time) - 3ft (0.9m), 12s period, SE swell with 220 kJ wave energy.
- Next surfable swell (1★+): Tuesday 18 Aug, 9AM (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 9AM. 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 0.9m 12s and forecast to arrive on Monday (Aug 24) at 3AM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.5m 4s period and expected on Wednesday (Aug 19) at 9AM.
| Wave Type | Time (-03) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 9AM (Tue 18th Aug) | 3.5ft (1.0m) 8s |
| Best Surf | 9AM (Tue 18th Aug) | 3.5ft (1.0m) 8s |
| Most Powerful | 3AM (Mon 24th Aug) | 3ft (0.9m) 12s |
Table - best surf conditions forecast for Prainha over the next 16 days.
The Lowdown
Alright, buddy, Rusty here. Let's chew the fat on the Prainha forecast for the next couple of weeks. It's a slow start. You're gonna be doing more paddling than surfing for a few days. Water temp is hanging around 67°F, which is a touch warmer than usual – not bad at all.
Your first real look-in is Tuesday morning, the 18th of August. It’s tiny, with waves around 3ft coming from the east on a short 8-second period. The energy is weak, so you'll be scratching for anything. The good news is it's glassy with that NNW breeze at just 3 mph. It’ll be as clean as a whistle, just small.
Then we hit a dry patch. We get some clean mornings like Wednesday the 19th with 3ft waves, but the energy is still low. The winds are light and cross-off, keeping the surface smooth, but you’ll be waiting a long time between sets.
The real standout is way out there on Monday, the 31st of August. That's where it gets interesting. The swell jumps to a solid 5ft from the southeast, and the energy finally has some real push to it. The afternoon is the pick of the whole forecast: glassy conditions with that southerly wind dropping to nothing. That's the session. Just be aware that 5ft is starting to get a bit chunky for beginners, but for the experienced crew, that’s the ticket.
Before that, the morning of Friday the 28th of August is worth a mention. You get 4ft from the east with a 9-second period and decent energy. The wind is light and clean from the northwest. It's a solid, surfable morning, but it’s not in the same league as that Monday the 31st.
So, the game plan is simple: scratch around in the small clean stuff early on, then go all in on that glassy Monday the 31st. Expect a few other blokes to have the same idea, Prainha gets busy when it's good.
Rusty.
Short Range ForecastMostly dry. Warm (max 24°C on Tue afternoon, min 17°C on Wed afternoon). Wind will be generally light. | Days 4-6 Weather SummaryLight rain (total 2mm), mostly falling on Sat night. Warm (max 22°C on Fri afternoon, min 15°C on Fri night). Wind will be generally light. | ||||||||||||||||||||
Monday 17 | Tuesday 18 | Wednesday 19 | Thursday 20 | Friday 21 | Saturday 22 | Sunday 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 | E 8 | E 8 | E 8 | E 8 | E 8 | E 8 | E 8 | E 8 | E 8 | E 7 | E 7 | E 8 | E 9 | E 9 | SE 9 | SE 10 | SE 12 | SE 12 | SE 13 |
Wave Graph  | |||||||||||||||||||||
 kJ | 185 | 199 | 132 | 129 | 136 | 108 | 99 | 55 | 55 | 41 | 41 | 52 | 68 | 102 | 73 | 54 | 31 | 23 | 132 | 66 | 82 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | on | cross-on | glassy | cross-on | cross | cross-off | cross-on | cross-off | cross-on | cross-on | glassy | off | cross | cross | glassy | cross-on | cross-on | cross-on | on | cross |
High Tide | 5:41PM1.02m | 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 | 10:27AM0.25m | 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 | ||||||
 |  |  | | | | | |  | | |  |  | | | | |  |  | | | |
 | 6:41 | — | — | 6:39 | — | — | 6:39 | — | — | 6:37 | — | — | 6:37 | — | — | 6:37 | — | — | 6:35 | — | — |
 | — | 5:54 | — | — | 5:54 | — | — | 5:54 | — | — | 5:55 | — | — | 5:55 | — | — | 5:57 | — | — | 5:57 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 2 | 1 | — | 3 |
Temp °C | 20 | 20 | 20 | 21 | 24 | 24 | 18 | 18 | 18 | 18 | 19 | 21 | 21 | 22 | 18 | 16 | 16 | 15 | 15 | 16 | 16 |
Feels °C | 21 | 20 | 21 | 22 | 25 | 25 | 19 | 18 | 19 | 18 | 20 | 21 | 18 | 19 | 15 | 14 | 13 | 12 | 14 | 15 | 14 |
Swell 1 Height (m) Direction Period (s) | E 8 | E 8 | E 8 | E 8 | E 8 | E 8 | E 8 | E 8 | E 8 | E 8 | E 8 | E 7 | E 7 | E 8 | E 9 | E 9 | E 8 | ENE 8 | SE 12 | SE 12 | SE 13 |
| kJ | 185 | 199 | 132 | 129 | 136 | 108 | 99 | 55 | 55 | 41 | 41 | 52 | 68 | 102 | 73 | 54 | 37 | 22 | 132 | 66 | 82 |
Swell 2 Height (m) Direction Period (s) | SSE 10 | SE 10 | SSE 9 | SSE 9 | SE 9 | SE 8 | SE 8 | SSE 4 | E 13 | SE 12 | S 6 | SE 6 | SE 5 | S 8 | SE 9 | SE 10 | SE 9 | SE 10 | ENE 8 | E 8 | E 8 |
| kJ | 10 | 4 | 8 | 8 | 3 | 3 | 3 | 2 | 3 | 6 | 1 | 1 | 1 | 5 | 70 | 46 | 31 | 23 | 11 | 10 | 4 |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | S 9 | E 14 | S 9 | E 13 | S 8 | S 11 | E 12 | SE 11 | SSE 6 | — | — | SSE 10 | — | SE 14 | ENE 8 | ENE 4 | — |
| kJ | — | — | — | — | 2 | 4 | 2 | 3 | 1 | 9 | 3 | 5 | 3 | — | — | 9 | — | 7 | 19 | 1 | — |
Wind waves Height (m) Direction Period (s) | — | — | — | — | — | — | SSE 4 | — | — | — | — | — | SSW 3 | SSW 3 | — | — | — | SE 4 | — | — | ESE 4 |
| kJ | — | — | — | — | — | — | 8 | — | — | — | — | — | 1 | 1 | — | — | — | 11 | — | — | 5 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 4 | 96 | 4 | 0 | 73 | 33 | 0 | 128 | 0 | 4 | 73 | 0 | 0 | 61 | 33 | 0 | 73 | 91 | 28 | 73 | 121 |
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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