Surf Forecasts:
Atlantida surf forecast from 18 Aug 2026:
- Best quality surf: Saturday 22 Aug, 9PM (local time) - 7ft (2.2m), 10s period, S swell with cross-offshore winds.
- Most powerful swell: Monday 24 Aug, 6AM (local time) - 7.5ft (2.3m), 14s period, SSE swell with 2,048 kJ wave energy.
- Next surfable swell (1★+): Tuesday 18 Aug, 6AM (local time) - 4.5ft (1.4m), 8s period with ENE swell.
Best Forecast Surf Conditions for Atlantida this week:
The surf forecast for Atlantida 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 1.4m and 8s period with a secondary swell of 0.2m and 10s. The wind is predicted to be glassy as the swell arrives.
The most powerful waves expected at Atlantida in the next 16 days are 2.3m 14s and forecast to arrive on Monday (Aug 24) at 6AM. Winds are predicted to be offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.6m 5s period and expected on Friday (Aug 21) at 12PM.
| Wave Type | Time (-03) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 6AM (Tue 18th Aug) | 4.5ft (1.4m) 8s |
| Best Surf | 9PM (Sat 22nd Aug) | 7ft (2.2m) 10s |
| Most Powerful | 6AM (Mon 24th Aug) | 7.5ft (2.3m) 14s |
Table - best surf conditions forecast for Atlantida over the next 16 days.
The Lowdown
Alright folks, Rusty here with a look at what Atlantida has got cookin' over the next couple of weeks. Gotta be straight with you, it's been a bit of a slow start, but there's a real gem hiding out there for the patient ones.
Right now, through this week, it’s mostly a tale of small, choppy waves and funky winds. We’ve got a bit of swell running, but the wind's all over the shop. Tuesday the 18th and Wednesday the 19th are a write-off with tiny waves and poor conditions. The paddle out ain't worth the hassle.
Thursday the 20th gets a little bump in size with some swell at 6ft, but a strong 19 mph cross-shore wind will have it looking like a washing machine. Not our day. Through Friday and Saturday, the wind switches offshore, cleaning things up, but the swell is pretty weak, only around 2ft to 4ft, with poor wave energy (62 to 317). It might look pretty, but there's just not enough push.
Now, hold onto your board shorts. Sunday the 23rd is where things start to get interesting. We’ve got a solid 6ft building from the South, and with an 11-second period, that’s some proper groundswell energy (798). The wind is a clean cross-offshore all day. That’s the first real chance for a good session, but the real standout is lurking just around the corner.
The absolute best on offer, no question, is Monday the 24th of August. Atlantida is going to be pumping. We’re looking at a solid 7ft swell from the SSE, and the period stretches out to a very long 14 seconds. That's proper energy (1803). The kicker? Glassy conditions in the morning with a 3 mph northerly. This is going to be a big, clean, powerful swell. Just a heads up, at this size and with that long period, this is going to be a heavy, straight-breaking wave at this beach setup, so it’s really one for the experienced crew. The water temp is about average for the time of year.
After that big Monday, it settles down through the rest of the week. Tuesday the 25th has a residual 5ft from the SSE, but the cross-shore wind will chop it up. Wednesday the 26th through the end of the month gives us some clean mornings with smaller 3ft to 3ft surf, perfect for a log or a soft top if the tide is right.
There’s a bit of a gap in quality, then the very last day of the outlook, Saturday the 30th, shows some decent 3ft waves with a light offshore wind. A small but clean option. The run into September looks pretty average, with a big NE wind event on the 1st that will just ruin what little surf there is.
So to sum it up: the first week is a struggle, but don't sleep on that Sunday/Monday combo on the 23rd and 24th. That Monday morning is the one to circle on the calendar.
Rusty.
Short Range ForecastLight rain (total 3mm), mostly falling on Wed morning. Warm (max 24°C on Mon night, min 16°C on Tue night). Winds increasing (calm on Wed morning, fresh winds from the NE by Thu morning). | Days 5-7 Weather SummarySome drizzle, heaviest during Thu night. Very mild (max 19°C on Thu night, min 8°C on Sat night). Mainly fresh winds. | ||||||||||||||||||
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) | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 6 | E 6 | ENE 7 | ENE 7 | S 8 | S 8 | S 8 | S 8 | S 10 | S 11 | S 11 | SSE 12 |
Wave Graph | |||||||||||||||||||
306 | 221 | 190 | 147 | 125 | 96 | 104 | 197 | 94 | 136 | 51 | 153 | 562 | 287 | 360 | 573 | 790 | 694 | 1240 | |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross | cross-on | cross | cross | cross-on | cross-on | cross | cross-on | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off |
High Tide | 9:36PM0.23m | 3:16AM0.52m | 3:26PM0.46m | 10:27PM0.21m | 3:59AM0.46m | 3:55PM0.44m | 11:10PM0.20m | 4:44AM0.39m | 4:19PM0.41m | 11:41PM0.21m | 5:36AM0.33m | 12:09PM0.43m | 00:01AM0.22m | 12:39PM0.46m | 00:11AM0.25m | 1:07PM0.49m | 00:07AM0.28m | ||
Low Tide | 11:09PM0.21m | 7:14AM0.21m | 7:34PM0.12m | 7:40AM0.23m | 12:33PM0.31m | 8:16PM0.13m | 8:01AM0.25m | 1:37PM0.35m | 8:52PM0.15m | 8:08AM0.28m | 3:21PM0.37m | 9:21PM0.18m | 9:40PM0.22m | 4:26AM0.14m | 9:12PM0.26m | ||||
— | 6:50 | — | — | 6:50 | — | — | 6:48 | — | — | 6:48 | — | — | 6:47 | — | — | 6:45 | — | — | |
— | — | 5:57 | — | — | 5:58 | — | — | 5:58 | — | — | 5:59 | — | — | 5:59 | — | — | 6:00 | — | |
mm | — | — | — | — | 2 | — | — | — | 1 | 1 | — | — | — | — | — | — | — | — | — |
Temp °C | 24 | 22 | 20 | 18 | 17 | 17 | 17 | 18 | 20 | 19 | 15 | 16 | 13 | 12 | 12 | 10 | 12 | 14 | 10 |
Feels °C | 25 | 22 | 20 | 19 | 18 | 17 | 17 | 16 | 21 | 20 | 9 | 11 | 9 | 6 | 6 | 6 | 7 | 9 | 7 |
Swell 1 Height (m) Direction Period (s) | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | SSE 7 | S 8 | E 6 | ENE 7 | ENE 7 | S 8 | S 8 | S 8 | S 8 | S 10 | S 11 | S 11 | SSE 12 |
306 | 221 | 190 | 147 | 125 | 96 | 58 | 34 | 94 | 136 | 51 | 153 | 311 | 287 | 360 | 573 | 790 | 694 | 1240 | |
Swell 2 Height (m) Direction Period (s) | SSE 10 | S 9 | S 9 | S 8 | S 7 | S 7 | S 9 | SE 6 | ENE 8 | S 8 | S 7 | ENE 7 | ENE 8 | ENE 9 | ENE 9 | ENE 9 | ENE 9 | ENE 8 | NE 8 |
10 | 7 | 2 | 1 | 23 | 61 | 24 | 8 | 23 | 10 | 4 | 21 | 22 | 30 | 32 | 17 | 8 | 7 | 3 | |
Swell 3 Height (m) Direction Period (s) | E 9 | — | SE 8 | E 14 | E 12 | SE 13 | SE 13 | SE 12 | S 8 | E 12 | S 9 | — | — | — | — | — | — | — | — |
1 | — | 3 | 4 | 3 | 7 | 7 | 6 | 21 | 3 | 7 | — | — | — | — | — | — | — | — | |
Wind waves Height (m) Direction Period (s) | — | — | S 3 | S 3 | — | — | ENE 8 | ENE 6 | — | W 2 | WSW 4 | WSW 4 | S 8 | WSW 4 | WSW 4 | — | — | WSW 3 | — |
— | — | 2 | 2 | — | — | 104 | 197 | — | 1 | 61 | 27 | 562 | 13 | 12 | — | — | 7 | — | |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 18 | 18 | 190 | 190 | 190 | 190 | 204 | 208 | 230 | 18 | 190 | 222 | 222 | 222 | 570 | 0 | 0 | 209 | 0 |
Best forecast wave conditions in Rio Grande Do Sul | |||||||||||||||||||
Best forecast wave conditions in Brazil | |||||||||||||||||||
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Information about the Atlantida Surf forecast
The above surf forecast table for Atlantida provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Atlantida can be found by selecting the local surf guide option on the grey menu. Our Atlantida 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 (Atlantida) 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 Atlantida 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.
Are you planning a holiday in Rio Grande Do Sul? If you are looking for accommodation near Atlantida, camping, hotels and holiday cottages in Rio Grande Do Sul, consider staying in Capao da Canoa which is 8 km (5 miles) away. Other places in and around Rio Grande Do Sul where you can find information about places to rent, and car hire include Tramandai which is 21 km (13 miles) away, Osorio, Rolante and Torres.











