
Surf Forecasts:
Prainha surf forecast from 21 Jul 2026:
- Best quality surf: Friday 24 Jul, 12AM (local time) - 5ft (1.5m), 9s period, SSE swell with cross-offshore winds.
- Most powerful swell: Friday 24 Jul, 12AM (local time) - 5ft (1.5m), 9s period, SSE swell with 375 kJ wave energy.
- Next surfable swell (1★+): Tuesday 21 Jul, 6AM (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 Tuesday (Jul 21) at 6AM. The primary swell is predicted to be 0.9m and 8s period with a secondary swell of 0.1m 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 1.5m 9s and forecast to arrive on Friday (Jul 24) at 12AM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.3m 8s period and expected on Tuesday (Jul 21) at 6PM.
| Wave Type | Time (-03) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 6AM (Tue 21st Jul) | 3ft (0.9m) 8s |
| Best Surf | 12AM (Fri 24th Jul) | 5ft (1.5m) 9s |
| Most Powerful | 12AM (Fri 24th Jul) | 5ft (1.5m) 9s |
Table - best surf conditions forecast for Prainha over the next 16 days.
The Lowdown
Alright, let’s talk about Prainha. I’ve been watching the charts, and honestly, it’s a bit of a slow burn. We’ve got some small, workable waves scattered through the period, but nothing that’s going to have you paddling out with your heart racing. The water temp here is about average for this time of year, nothing wild.
For the first week, don’t get too excited. Tuesday the 21st is a write-off after the morning. That glassy morning session with a tiny 3ft easterly swell and a combined energy of only 105 is just about surfable, but it’s not going to win any awards. Wednesday and Thursday are equally uninspiring with the swell dropping to 3ft, and Thursday gets blown out by a 16 mph southerly cross-shore wind. That’s more of a kite day paddle.
Friday the 24th is where things start to look a little more interesting. We see a shift in the swell to the southeast, and the period bumps up to 9 seconds. The morning is glassy with a combined energy of 141. It’s still just a 3ft wave, but the longer period will give it a bit more shape than the earlier short-period stuff. Not a standout, but the best of the first week.
Saturday the 25th is similar but a touch smaller in the afternoon. Sunday and Monday have some glassy mornings with 2ft swell, but the energy is weak. Then from Tuesday the 28th, it really tails off into tiny, poor conditions for a few days, with the swell barely cracking 2ft. That’s the quiet gap.
Now, here’s the promising bit. Look towards the start of August. On the 1st of August, there’s a real interesting spike. The morning shows a glassy, 2ft swell from the south-southeast, but the period jumps to 11 seconds, and the combined energy hits 175. That’s a moderate pulse of energy for a small wave. It’s a longer-period groundswell, which at a beach break like Prainha might break a bit straight, but with glassy conditions, it could offer some clean, lined-up rides.
Then the real gem appears on the 5th of August, which is a Wednesday morning. That’s the one. We’ve got a 4ft swell from the same SSE direction, with a combined energy of 209. It’s a moderate swell, not too big for the advanced crew here, and that’s the size where Prainha really starts to link up. The wind is calm and glassy. This is the best on offer, no question. Keep in mind it’s a long way out, so the forecast could shift, but right now it’s the clear highlight.
The rest of the second week is the usual mix of glassy mornings and messy afternoons, but keep your eye on that Wednesday the 5th.
Stay frothy.
Rusty
Short Range ForecastLight rain (total 3mm), mostly falling on Thu morning. Warm (max 24°C on Tue morning, min 16°C on Thu afternoon). Wind will be generally light. | Days 5-7 Weather SummaryModerate rain (total 16mm), heaviest on Thu night. Warm (max 20°C on Sat afternoon, min 16°C on Thu night). Wind will be generally light. | ||||||||||||||||||
Tuesday 21 | Wednesday 22 | Thursday 23 | Friday 24 | Saturday 25 | Sunday 26 | ||||||||||||||
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 | S 10 | E 8 | E 8 | E 8 | E 8 | E 8 | SSE 9 | SE 9 | SE 9 | SE 9 | SE 9 | SE 8 | SE 9 | SE 8 | SE 8 | SE 8 |
Wave Graph | |||||||||||||||||||
108 | 103 | 100 | 2 | 82 | 82 | 116 | 66 | 66 | 375 | 141 | 117 | 112 | 107 | 72 | 112 | 74 | 72 | 72 | |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | glassy | glassy | on | cross-off | cross-off | cross-off | cross | cross | cross-off | cross-off | glassy | off | off | off | cross-on | cross-off | glassy | on | cross-on |
High Tide | 7:41AM0.99m | 8:11PM0.88m | 8:54AM0.93m | 4:18PM0.68m | 9:14PM0.85m | 10:17AM0.93m | 10:25PM0.85m | 11:34AM0.99m | 11:33PM0.90m | 12:35PM1.08m | 00:28AM0.97m | 1:22PM1.16m | 1:14AM1.06m | ||||||
Low Tide | 11:46PM0.44m | 12:20PM0.48m | 00:39AM0.47m | 1:13PM0.60m | 1:52AM0.50m | 6:26PM0.63m | 5:56AM0.45m | 7:10PM0.56m | 6:41AM0.35m | 7:43PM0.51m | 7:15AM0.26m | 8:08PM0.46m | |||||||
— | 6:58 | — | — | 6:58 | — | — | 6:58 | — | — | 6:56 | — | — | 6:56 | — | — | 6:56 | — | — | |
— | — | 5:42 | — | — | 5:42 | — | — | 5:43 | — | — | 5:43 | — | — | 5:44 | — | — | 5:44 | — | |
mm | — | — | — | — | — | — | — | 1 | 2 | 7 | 3 | 4 | — | 2 | — | — | — | — | — |
Temp °C | 22 | 24 | 24 | 24 | 21 | 22 | 20 | 17 | 16 | 16 | 16 | 16 | 17 | 19 | 20 | 19 | 17 | 18 | 18 |
Feels °C | 23 | 24 | 25 | 24 | 21 | 22 | 21 | 13 | 14 | 15 | 17 | 16 | 17 | 20 | 21 | 20 | 19 | 18 | 18 |
Swell 1 Height (m) Direction Period (s) | E 8 | E 8 | E 8 | ENE 8 | E 8 | E 8 | E 8 | E 8 | E 8 | SSE 5 | SE 9 | SE 9 | SE 9 | SE 9 | SE 8 | SE 9 | SE 8 | SE 8 | SE 8 |
108 | 103 | 100 | 109 | 82 | 82 | 116 | 66 | 66 | 19 | 141 | 117 | 112 | 107 | 72 | 112 | 74 | 72 | 72 | |
Swell 2 Height (m) Direction Period (s) | S 11 | S 11 | S 10 | S 10 | S 9 | S 8 | S 8 | SE 11 | SSE 5 | E 8 | E 8 | E 8 | E 8 | E 8 | E 8 | E 8 | ENE 8 | ENE 8 | ENE 7 |
2 | 2 | 2 | 2 | 2 | 1 | 11 | 5 | 17 | 51 | 33 | 33 | 30 | 18 | 18 | 10 | 11 | 11 | 11 | |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | S 12 | S 9 | SE 10 | SE 10 | — | — | — | S 15 | SE 14 | SE 15 | SSE 13 | SSE 12 | SSE 11 |
— | — | — | — | — | — | 3 | 2 | 4 | 44 | — | — | — | 4 | 7 | 8 | 17 | 15 | 24 | |
Wind waves Height (m) Direction Period (s) | — | — | — | — | — | SSE 3 | N 3 | SSE 4 | S 6 | SSE 9 | — | — | — | — | — | — | — | — | NE 3 |
— | — | — | — | — | 4 | 8 | 12 | 66 | 375 | — | — | — | — | — | — | — | — | 1 | |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 0 | 0 | 73 | 28 | 0 | 0 | 4 | 85 | 61 | 0 | 0 | 0 | 0 | 0 | 11 | 0 | 0 | 73 | 4 |
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.










