Surf Forecasts:
Lopes Mendes (Ilha Grande) surf forecast from 16 Sep 2026:
- Best quality surf: Thursday 17 Sep, 12AM (local time) - 5ft (1.6m), 11s period, S swell with cross-offshore winds.
- Most powerful swell: Thursday 17 Sep, 3PM (local time) - 5.5ft (1.7m), 12s period, S swell with 778 kJ wave energy.
- Next surfable swell (1★+): Thursday 17 Sep, 12AM (local time) - 5ft (1.6m), 11s period with S swell.
Best Forecast Surf Conditions for Lopes Mendes (Ilha Grande) this week:
The surf forecast for Lopes Mendes (Ilha Grande) over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Thursday (Sep 17) at 12AM. The primary swell is predicted to be 1.6m and 11s period with a secondary swell of 0.5m and 8s. The wind is predicted to be cross-offshore as the swell arrives.
The most powerful waves expected at Lopes Mendes (Ilha Grande) in the next 16 days are 1.7m 12s and forecast to arrive on Thursday (Sep 17) 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 2.1m 8s period and expected on Sunday (Sep 20) at 3AM.
| Wave Type | Time (-03) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 12AM (Thu 17th Sep) | 5ft (1.6m) 11s |
| Best Surf | 12AM (Thu 17th Sep) | 5ft (1.6m) 11s |
| Most Powerful | 3PM (Thu 17th Sep) | 5.5ft (1.7m) 12s |
Table - best surf conditions forecast for Lopes Mendes (Ilha Grande) over the next 16 days.
Short Range ForecastLight rain (total 8mm), mostly falling on Wed morning. Warm (max 20°C on Wed morning, min 18°C on Wed night). Winds increasing (light winds from the S on Wed afternoon, fresh winds from the E by Fri afternoon). | Days 4-6 Weather SummaryHeavy rain (total 26mm), heaviest during Sun night. Warm (max 28°C on Mon afternoon, min 20°C on Sat night). Winds decreasing (fresh winds from the E on Sat afternoon, calm by Mon morning). | ||||||||||||||||||||
Wednesday 16 | Thursday 17 | Friday 18 | Saturday 19 | Sunday 20 | Monday 21 | Tuesday 22 | |||||||||||||||
AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | |
Wave Height (m) Direction Period (s) | S 10 | S 10 | S 11 | S 9 | S 12 | S 10 | S 11 | S 11 | S 10 | S 10 | ESE 7 | S 9 | S 12 | ESE 8 | ESE 8 | S 12 | S 11 | S 10 | S 10 | S 9 | SE 5 |
Wave Graph  | |||||||||||||||||||||
 kJ | 128 | 190 | 607 | 318 | 778 | 450 | 155 | 274 | 198 | 143 | 350 | 41 | 48 | 246 | 218 | 25 | 22 | 19 | 16 | 7 | 23 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | cross-on | cross-off | cross-off | cross-off | off | cross-off | cross-off | off | off | cross-off | off | off | cross-on | cross-off | cross-off | glassy | cross-off | cross-off | cross | cross-on |
High Tide | 4:39PM0.92m | 5:29AM0.89m | 5:05PM0.84m | 6:19AM0.77m | 5:35PM0.76m | 12:03PM0.77m | 6:33PM0.66m | 12:26PM0.86m | 11:44PM0.73m | 12:49PM0.96m | 00:16AM0.85m | 1:12PM1.04m | 00:43AM0.96m | ||||||||
Low Tide | 11:27AM0.47m | 11:24PM0.29m | 12:01PM0.57m | 00:20AM0.36m | 10:03AM0.67m | 1:55PM0.65m | 2:20AM0.42m | 4:17PM0.64m | 4:13AM0.39m | 5:45PM0.56m | 5:29AM0.30m | 6:23PM0.47m | 6:19AM0.19m | 6:54PM0.38m | |||||||
 | |  |  | |  | |  |  |  | |  | |  |  | | | | | | | |
 | 5:52 | — | — | 5:50 | — | — | 5:50 | — | — | 5:48 | — | — | 5:48 | — | — | 5:47 | — | — | 5:46 | — | — |
 | — | 5:50 | — | — | 5:50 | — | — | 5:51 | — | — | 5:51 | — | — | 5:51 | — | — | 5:52 | — | — | 5:52 | — |
mm | 3 | 2 | 3 | — | — | — | — | — | — | — | — | 3 | — | 4 | 19 | — | — | — | — | — | 1 |
Temp °C | 20 | 19 | 19 | 19 | 19 | 19 | 20 | 20 | 20 | 23 | 23 | 21 | 25 | 24 | 23 | 27 | 28 | 27 | 27 | 26 | 22 |
Feels °C | 19 | 19 | 18 | 17 | 17 | 18 | 18 | 17 | 17 | 21 | 20 | 22 | 27 | 26 | 23 | 29 | 30 | 29 | 28 | 28 | 24 |
Swell 1 Height (m) Direction Period (s) | S 10 | S 10 | S 11 | S 9 | S 12 | S 10 | S 9 | S 11 | S 10 | S 10 | S 9 | S 9 | ESE 8 | S 12 | ESE 8 | E 8 | ESE 8 | ESE 8 | ESE 8 | E 8 | SE 5 |
| kJ | 128 | 190 | 607 | 318 | 778 | 450 | 127 | 274 | 198 | 121 | 85 | 41 | 226 | 69 | 218 | 115 | 94 | 107 | 107 | 105 | 23 |
Swell 2 Height (m) Direction Period (s) | ESE 8 | S 12 | ESE 8 | S 14 | SSE 7 | S 12 | S 11 | — | — | S 15 | S 14 | S 13 | S 9 | S 12 | S 13 | S 12 | S 11 | S 10 | S 10 | S 9 | E 8 |
| kJ | 50 | 143 | 36 | 129 | 5 | 73 | 155 | — | — | 5 | 4 | 31 | 25 | 69 | 50 | 25 | 22 | 19 | 16 | 7 | 50 |
Swell 3 Height (m) Direction Period (s) | SE 8 | ESE 8 | SE 9 | ESE 10 | — | ESE 9 | ESE 8 | — | — | S 15 | — | S 13 | S 12 | — | — | WNW 4 | — | E 15 | SE 14 | SE 13 | S 9 |
| kJ | 33 | 51 | 27 | 57 | — | 48 | 28 | — | — | 4 | — | 32 | 48 | — | — | 1 | — | 4 | 7 | 7 | 6 |
Wind waves Height (m) Direction Period (s) | SSW 5 | — | — | — | ESE 10 | E 5 | ESE 6 | ESE 6 | E 6 | ESE 6 | ESE 7 | ESE 7 | E 8 | ESE 8 | N 3 | N 4 | — | — | — | NNE 2 | — |
| kJ | 33 | — | — | — | 54 | 57 | 62 | 182 | 239 | 143 | 350 | 365 | 368 | 246 | 7 | 2 | — | — | — | 1 | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 20 | 176 | 0 | 58 | 58 | 0 | 58 | 59 | 0 | 0 | 72 | 0 | 0 | 20 | 63 | 77 | 65 | 20 | 65 | 97 | 20 |
Best forecast wave conditions in Rio de Janeiro | |||||||||||||||||||||
Best forecast wave conditions in Brazil | |||||||||||||||||||||
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Information about the Lopes Mendes (Ilha Grande) Surf forecast
The above surf forecast table for Lopes Mendes (Ilha Grande) provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Lopes Mendes (Ilha Grande) can be found by selecting the local surf guide option on the grey menu. Our Lopes Mendes (Ilha Grande) 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 (Lopes Mendes (Ilha Grande)) 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 Lopes Mendes (Ilha Grande) 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.
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