Surf Forecasts:
Prainha surf forecast from 13 Sep 2026:
- Best quality surf: Monday 14 Sep, 3AM (local time) - 4.5ft (1.4m), 7s period, SSE swell with offshore winds.
- Most powerful swell: Sunday 13 Sep, 3PM (local time) - 6ft (1.9m), 7s period, SSE swell with 316 kJ wave energy.
- Next surfable swell (1★+): Monday 14 Sep, 3AM (local time) - 4.5ft (1.4m), 7s period with SSE 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 Monday (Sep 14) at 3AM. The primary swell is predicted to be 1.4m and 7s period with a secondary swell of 0.8m and 7s. Another secondary swell of 0.3m and 8s is also forecast. The wind is predicted to be offshore as the swell arrives.
The most powerful waves expected at Prainha in the next 16 days are 1.9m 7s and forecast to arrive on Sunday (Sep 13) at 3PM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.9m 8s period and expected on Sunday (Sep 20) at 6AM.
| Wave Type | Time (-03) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 3AM (Mon 14th Sep) | 4.5ft (1.4m) 7s |
| Best Surf | 3AM (Mon 14th Sep) | 4.5ft (1.4m) 7s |
| Most Powerful | 3PM (Sun 13th Sep) | 6ft (1.9m) 7s |
Table - best surf conditions forecast for Prainha over the next 16 days.
The Lowdown
Alright, Rusty here. Let’s check out what’s on offer.
Right out of the gate, nothing is happening for a couple of days. The first surf worth getting in the water for at Prainha pops up on Monday the 14th. Things get decent for a little while but fade again by Tuesday afternoon, and then we’re stuck with average or poor conditions until around Sunday the 20th. After a bit of hope there, it gets messy again through to the middle of the next week. The tail end of the outlook from Thursday the 24th onward looks cleaner but that’s a far-out call.
Monday 14th September gets things started. The morning has a 1.3m SSE swell (moderate energy of 219) and a light cross-offshore wind. The afternoon cleans right up: 1.2m SSE swell (energy 249) and an offshore breeze from the SW, making it the pick of the week. That’s the cleanest surf you’re going to find.
Tuesday 15th September offers a small 0.9m ESE morning swell (204 energy) but the afternoon turns onshore and gets choppy, so get in early or miss it.
Wednesday the 16th is a mess with a 1.5m SSE swell and cross-shore wind pushing a lot of chop through. Any session Thursday the 17th is weak at best; a glassy 0.7m SEA (2ft) in the morning (energy 155) but that’s just too small to get excited about.
From Friday 18th through Tuesday 22nd, expect onshore winds from the north or east and slopes of chop – 1.0 to 1.3m (3–4ft) swell with poor lines. Stay on land.
Sunday 20th September morning is a good one – glassy conditions, no wind, and a 1.2m (4ft) easterly swell (energy 205). That’s your clean moment from this long quiet period. Don’t miss it if you’re around.
The next chance worth a mention is Thursday 24th September morning, with 1.0m (3ft) ESE swell (energy 263) and a light cross-offshore breeze from the SW. Clean but not big.
After that, it’s all downhill. From Friday the 25th out to Monday the 28th, the swell drops to under 0.9m (3ft) and the winds turn onshore or cross-onshore. Flat and messy.
Best bets: Monday 14th afternoon for clean 1.2m (4ft) surf with offshore wind, and Sunday 20th morning for a glassy 1.2m (4ft) session. Thursday 24th morning shows promise but is a week and a half out.
Water is sitting around 69°F, slightly warmer than usual for this time of year – nice for a paddle.
Rusty.
Short Range ForecastHeavy rain (total 29mm), heaviest during Sun afternoon. Very mild (max 17°C on Tue afternoon, min 13°C on Sun night). Wind will be generally light. | Days 4-6 Weather SummaryModerate rain (total 16mm), heaviest on Fri night. Very mild (max 19°C on Thu night, min 16°C on Wed morning). Winds increasing (calm on Wed night, fresh winds from the NE by Fri night). | ||||||||||||||||||||
Sunday 13 | Monday 14 | Tuesday 15 | Wednesday 16 | Thursday 17 | Friday 18 | Saturday 19 | |||||||||||||||
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) | SSE 7 | SSE 7 | SSE 7 | SSE 7 | SSE 8 | SE 8 | ESE 8 | ESE 8 | ESE 8 | SE 8 | SSE 8 | SE 9 | SE 12 | SE 12 | SE 12 | E 6 | E 6 | E 7 | E 8 | E 8 | E 8 |
Wave Graph  | |||||||||||||||||||||
 kJ | 93 | 316 | 262 | 164 | 188 | 35 | 119 | 119 | 134 | 125 | 257 | 112 | 134 | 86 | 36 | 114 | 76 | 157 | 160 | 172 | 187 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross-off | cross-off | cross-off | off | off | cross-off | cross-on | cross | cross | cross | cross | glassy | on | cross-on | on | on | on | on | on | cross |
High Tide | 4:00PM1.20m | 4:11AM1.30m | 4:24PM1.12m | 4:47AM1.20m | 4:46PM1.03m | 5:29AM1.08m | 5:05PM0.94m | 6:25AM0.96m | 3:17PM0.86m | 7:47AM0.87m | 2:57PM0.84m | 7:29PM0.75m | 3:37AM0.60m | 2:39PM0.82m | 9:26PM0.76m | ||||||
Low Tide | 9:03AM0.11m | 9:02PM0.16m | 9:27AM0.19m | 9:31PM0.14m | 9:52AM0.29m | 10:01PM0.16m | 10:20AM0.40m | 10:35PM0.22m | 10:50AM0.52m | 11:13PM0.32m | 11:26AM0.65m | 6:08PM0.74m | 4:56AM0.59m | 12:22PM0.78m | 6:24PM0.64m | ||||||
 |  |  | | |  |  |  |  |  |  |  | | | | | | |  | | | |
 | 6:13 | — | — | 6:13 | — | — | 6:11 | — | — | 6:09 | — | — | 6:09 | — | — | 6:07 | — | — | 6:07 | — | — |
 | — | 6:06 | — | — | 6:06 | — | — | 6:07 | — | — | 6:07 | — | — | 6:07 | — | — | 6:07 | — | — | 6:07 | — |
mm | 4 | 8 | 10 | 4 | 2 | — | — | — | 1 | 1 | — | — | — | — | 3 | 2 | 2 | 8 | 20 | 9 | 8 |
Temp °C | 15 | 15 | 15 | 13 | 13 | 14 | 16 | 17 | 17 | 16 | 17 | 16 | 17 | 18 | 19 | 18 | 19 | 19 | 19 | 19 | 19 |
Feels °C | 11 | 11 | 11 | 11 | 10 | 12 | 14 | 15 | 15 | 13 | 14 | 12 | 16 | 16 | 17 | 16 | 18 | 17 | 18 | 17 | 20 |
Swell 1 Height (m) Direction Period (s) | E 8 | SE 7 | SE 7 | SSE 7 | SE 5 | SE 8 | ESE 8 | ESE 8 | ESE 8 | SSE 12 | SE 8 | SE 9 | SE 12 | SE 12 | ESE 6 | E 6 | E 6 | SSE 9 | E 8 | E 8 | E 8 |
| kJ | 20 | 91 | 75 | 37 | 18 | 35 | 119 | 119 | 122 | 14 | 122 | 112 | 134 | 86 | 11 | 52 | 76 | 8 | 160 | 172 | 187 |
Swell 2 Height (m) Direction Period (s) | E 12 | E 8 | E 8 | E 5 | SE 9 | E 8 | SSE 8 | SE 9 | SSE 13 | E 13 | E 13 | ESE 8 | ESE 8 | E 7 | SE 12 | SE 10 | SE 10 | — | SSE 9 | SE 9 | SE 8 |
| kJ | 3 | 20 | 10 | 4 | 30 | 35 | 51 | 62 | 17 | 4 | 3 | 19 | 11 | 10 | 36 | 17 | 14 | — | 8 | 3 | 3 |
Swell 3 Height (m) Direction Period (s) | — | — | SE 13 | E 9 | E 8 | ESE 10 | SSE 10 | S 8 | SE 8 | E 14 | — | SE 14 | E 12 | E 11 | ESE 10 | ESE 9 | E 10 | — | SE 13 | SE 11 | S 8 |
| kJ | — | — | 7 | 14 | 13 | 11 | 34 | 36 | 3 | 4 | — | 7 | 10 | 10 | 20 | 8 | 8 | — | 7 | 5 | 1 |
Wind waves Height (m) Direction Period (s) | SSE 7 | SSE 7 | SSE 7 | SSE 7 | SSE 8 | — | — | ESE 2 | SSE 8 | SE 8 | SSE 8 | SE 6 | — | — | NE 4 | E 6 | NE 6 | E 7 | — | — | ENE 8 |
| kJ | 93 | 316 | 262 | 164 | 188 | — | — | 1 | 134 | 125 | 257 | 36 | — | — | 6 | 114 | 80 | 157 | — | — | 404 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 61 | 126 | 11 | 0 | 0 | 0 | 0 | 126 | 61 | 61 | 80 | 62 | 0 | 128 | 4 | 28 | 44 | 173 | 44 | 40 | 4 |
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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