
Surf Forecasts:
Arpoador surf forecast from 15 Sep 2026:
- Best quality surf: Wednesday 16 Sep, 12AM (local time) - 3.5ft (1.1m), 9s period, S swell with glassy winds.
- Most powerful swell: Thursday 17 Sep, 6PM (local time) - 4.5ft (1.3m), 12s period, S swell with 456 kJ wave energy.
- Next surfable swell (1★+): Wednesday 16 Sep, 12AM (local time) - 3.5ft (1.1m), 9s period with S swell.
Best Forecast Surf Conditions for Arpoador this week:
The surf forecast for Arpoador over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Wednesday (Sep 16) at 12AM. The primary swell is predicted to be 1.1m and 9s period with a secondary swell of 0.5m and 8s. Another secondary swell of 0.8m and 5s is also forecast. The wind is predicted to be glassy as the swell arrives.
The most powerful waves expected at Arpoador in the next 16 days are 1.3m 12s and forecast to arrive on Thursday (Sep 17) at 6PM. 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 6s period and expected on Friday (Sep 18) at 9PM.
| Wave Type | Time (-03) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 12AM (Wed 16th Sep) | 3.5ft (1.1m) 9s |
| Best Surf | 12AM (Wed 16th Sep) | 3.5ft (1.1m) 9s |
| Most Powerful | 6PM (Thu 17th Sep) | 4.5ft (1.3m) 12s |
Table - best surf conditions forecast for Arpoador over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let’s take a look at what Arpoador’s got cooking for us over the next couple of weeks.
Right off the bat, it’s a bit of a slow start. The first few days are pretty ordinary with choppy, messy conditions and not much to get excited about. The water temp is sitting at 73°, which is actually a touch warmer than we’d normally expect for this time of year. That’s a nice little bonus.
We’ve got to wait until the morning of Thursday, the 17th of September to see things start to turn. Thursday morning brings a clean 4ft swell from the SSE (9 seconds) with a light E wind blowing cross-offshore – that means clean lines and open faces. The combined swell energy is moderate (329), so there’s enough push to make it fun. This is a solid, cruisy option for the beginner-friendly Arpoador, but don't expect it to be empty – crowds are often around here. Thursday afternoon holds similar size but gets a touch more energy, though the morning is definitely your best window.
Saturday the 19th is a bit of a write-off, but then we get a standout. The morning of Sunday, the 20th of September, looks like the pick of the first week. We’re looking at a 5ft swell from the E (7 seconds) with glassy conditions – that’s a 5 km/h NNE wind, dead glass – and the combined energy is strong (441). It’s a bit of a short-period swell, but the glassy wind and decent size will make for some super clean, fun waves. If you can get out early, that’s your session.
After Sunday, it drops right off. From Monday the 21st all the way through to Thursday the 24th, there’s very little surf on offer – a real lull with tiny, weak waves and mostly poor conditions. It's a proper gap of three to four days where you're really not missing anything.
Then, we start looking at the second week. The morning of Friday the 25th of September is worth noting. A clean 4ft swell from the S with a long 13-second period, and a light NNE offshore wind. That’s a proper groundswell, with good shape and energy (combined energy of 424). This kind of longer-period swell can be a bit straight for the beach breaks, but Arpoador is a point, so it should handle it beautifully. Best on offer for that weekend.
Moving into the end of the month, the morning of Tuesday the 29th of September is the real highlight of this whole 16-day run. You’ll see a 4ft S swell with a really long 12-second period and a light NNW cross-offshore breeze that will keep things super clean. The combined energy is very strong (726), and it’s forecast for "very good surf conditions." This is the one to circle on the calendar. It’s still a couple of weeks out, so it’s promising but not locked in yet, but if it fires, it’s going to be a ripper.
The following morning, Wednesday the 30th of September, backs it up nicely with a glassy 3ft S swell (11 seconds), still with good energy (268). A great way to finish the run.
So, to sum it up: Sunday the 20th is your early standout for clean, fun waves, but the long-range call for Tuesday the 29th is the one that’s got me keen. Get out there when you can.
Rusty.
Short Range ForecastModerate rain (total 13mm), heaviest on Tue night. Warm (max 20°C on Tue afternoon, min 18°C on Tue night). Wind will be generally light. | Days 5-7 Weather SummaryLight rain (total 5mm), mostly falling on Mon morning. Warm (max 25°C on Sun morning, min 18°C on Fri night). Wind will be generally light. | |||||||||||||||||||
Tue 15 | Wednesday 16 | Thursday 17 | Friday 18 | Saturday 19 | Sunday 20 | Monday 21 | ||||||||||||||
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 10 | S 9 | SSE 8 | SSE 10 | S 12 | SSE 9 | SSE 10 | S 10 | S 11 | S 11 | S 10 | ESE 6 | ESE 7 | ESE 7 | E 7 | E 7 | ESE 8 | ESE 8 | ESE 7 | ESE 8 |
Wave Graph | ||||||||||||||||||||
205 | 199 | 151 | 169 | 383 | 222 | 288 | 196 | 118 | 189 | 128 | 101 | 134 | 186 | 267 | 276 | 117 | 72 | 48 | 54 | |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | glassy | cross-on | on | cross | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross | glassy | cross | cross-off | on | cross | off |
High Tide | 4:31PM1.00m | 5:08AM1.01m | 4:59PM0.91m | 6:06AM0.89m | 12:29PM0.62m | 00:53AM0.40m | 7:15AM0.80m | 12:41PM0.69m | 7:02PM0.75m | 8:16AM0.75m | 12:53PM0.75m | 8:06PM0.72m | 12:38PM0.81m | 10:05PM0.73m | 12:12PM0.89m | 11:28PM0.87m | ||||
Low Tide | 10:24PM0.24m | 10:23AM0.49m | 10:24PM0.29m | 10:14AM0.56m | 1:29PM0.61m | 10:36PM0.36m | 10:18AM0.62m | 3:06PM0.66m | 11:00PM0.45m | 3:22AM0.44m | 5:19PM0.58m | 5:15AM0.34m | 5:55PM0.48m | 5:56AM0.22m | 6:26PM0.40m | |||||
— | — | 5:48 | — | — | 5:48 | — | — | 5:47 | — | — | 5:45 | — | — | 5:43 | — | — | 5:43 | — | — | |
5:45 | — | — | 5:45 | — | — | 5:46 | — | — | 5:46 | — | — | 5:46 | — | — | 5:47 | — | — | 5:47 | — | |
mm | 1 | 4 | — | 2 | 4 | — | — | 2 | — | — | — | — | — | — | — | — | 1 | 4 | — | — |
Temp °C | 20 | 19 | 19 | 20 | 19 | 18 | 18 | 18 | 19 | 20 | 19 | 23 | 24 | 20 | 25 | 25 | 23 | 22 | 23 | 23 |
Feels °C | 19 | 19 | 20 | 20 | 18 | 17 | 16 | 17 | 17 | 18 | 17 | 22 | 23 | 19 | 26 | 25 | 25 | 24 | 24 | 24 |
Swell 1 Height (m) Direction Period (s) | SSE 10 | S 9 | SSE 8 | SSE 10 | S 12 | SSE 9 | SSE 10 | S 10 | SE 6 | S 11 | ESE 6 | ESE 6 | S 10 | ESE 7 | ESE 7 | ESE 7 | ESE 8 | ESE 8 | ESE 7 | ESE 8 |
205 | 199 | 151 | 169 | 383 | 222 | 288 | 196 | 47 | 189 | 103 | 85 | 64 | 151 | 108 | 84 | 117 | 72 | 48 | 54 | |
Swell 2 Height (m) Direction Period (s) | ESE 8 | SE 8 | SSE 13 | S 12 | SE 7 | S 14 | S 13 | SE 5 | S 11 | — | S 10 | S 10 | S 15 | S 9 | S 13 | S 12 | S 12 | S 12 | S 11 | S 10 |
7 | 28 | 57 | 113 | 27 | 97 | 117 | 30 | 118 | — | 128 | 69 | 4 | 27 | 52 | 74 | 27 | 24 | 10 | 8 | |
Swell 3 Height (m) Direction Period (s) | E 8 | ESE 9 | SE 12 | SE 8 | S 16 | ESE 10 | ESE 8 | S 12 | S 9 | — | — | S 16 | S 14 | S 14 | S 9 | — | S 14 | — | — | — |
33 | 25 | 6 | 29 | 21 | 10 | 47 | 72 | 53 | — | — | 5 | 16 | 32 | 14 | — | 4 | — | — | — | |
Wind waves Height (m) Direction Period (s) | SSW 5 | SW 5 | — | SSW 5 | — | — | E 10 | — | — | ESE 6 | ESE 6 | ESE 6 | ESE 7 | ESE 7 | E 7 | E 7 | NW 2 | — | — | — |
19 | 41 | — | 16 | — | — | 90 | — | — | 90 | 113 | 101 | 134 | 186 | 267 | 276 | 1 | — | — | — | |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 32 | 0 | 3 | 11 | 138 | 0 | 11 | 11 | 11 | 156 | 11 | 0 | 156 | 15 | 0 | 39 | 0 | 32 | 3 | 0 |
Best forecast wave conditions in Rio de Janeiro | ||||||||||||||||||||
Best forecast wave conditions in Brazil | ||||||||||||||||||||
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Information about the Arpoador Surf forecast
The above surf forecast table for Arpoador provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Arpoador can be found by selecting the local surf guide option on the grey menu. Our Arpoador 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 (Arpoador) 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 Arpoador 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.
Arpoador is 14 km (9 miles) from the very large city of Niteroi. If you plan a holiday in Rio de Janeiro, look for hotels and other accommodation in Niteroi. Niteroi has rooms for a wide range of budgets as well as cheap car hire and transport links.










