
Surf Forecasts:
Isla Negra surf forecast from 16 Sep 2026:
- Best quality surf: Sunday 20 Sep, 9PM (local time) - 5ft (1.6m), 10s period, WSW swell with cross-offshore winds.
- Most powerful swell: Sunday 20 Sep, 9PM (local time) - 5ft (1.6m), 10s period, WSW swell with 540 kJ wave energy.
- Next surfable swell (1★+): Wednesday 16 Sep, 12PM (local time) - 2ft (0.6m), 12s period with WSW swell.
Best Forecast Surf Conditions for Isla Negra this week:
The surf forecast for Isla Negra over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Wednesday (Sep 16) at 12PM. The primary swell is predicted to be 0.6m and 12s period with a secondary swell of 0.6m and 6s. The wind is predicted to be cross-offshore as the swell arrives.
The most powerful waves expected at Isla Negra in the next 16 days are 1.6m 10s and forecast to arrive on Sunday (Sep 20) at 9PM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.8m 12s period and expected on Monday (Sep 21) at 3PM.
| Wave Type | Time (-04) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 12PM (Wed 16th Sep) | 2ft (0.6m) 12s |
| Best Surf | 9PM (Sun 20th Sep) | 5ft (1.6m) 10s |
| Most Powerful | 9PM (Sun 20th Sep) | 5ft (1.6m) 10s |
Table - best surf conditions forecast for Isla Negra over the next 16 days.
The Lowdown
G’day, Rusty here. Look, it’s been a slow old start for Isla Negra. The first few days are pretty lackluster, with only tiny, weak waves and ordinary conditions. We’ve got to wait through a dead patch until the end of the week before anything really starts to happen.
Wednesday the 24th is where the story changes though. The combined energy from the swells jumps right up to (907), pushing in a solid *6ft* swell from the west at 11 seconds. That’s a proper step up in energy. There’s a bit of light rain around and a gentle cross-shore breeze, so it’s not going to be perfect, but the size is there. It’s going to be too much for most beginners, and the crowds at Isla Negra are *sometimes* an issue anyway. For experienced surfers, this one has some grunt.
Thursday the 25th might be the real standout of the whole run though. The swell holds near *6ft* from the west, with the period stretching out to 13 seconds – that’s a nice, long groundswell. The energy gets very strong, hitting (1230). It’s a reef break, so that long period will really draw into the point. The wind is a bit cross-onshore from the north, and the combined energy is so high (noted 5 digits) that it’s a lot of power. Still, that’s the day with the most potential; it will be proper, powerful stuff for the experts.
After that peak, the swell slowly drops back through the 26th and 27th with cleaner, smaller surf, then fades right out into flat, poor conditions by the end of the month. The end of the month sees the combined energy barely register a 2, so really, it’s a story of one big push mid-week.
Keep in mind, most of the good days have a slight cross-off or cross-on element to the wind, not the glassy perfection we’d dream of. But that Thursday morning on the 25th, for a thick, long-period west swell at Isla Negra – that’s the one to circle.
Rusty.
Short Range ForecastMostly dry. Warm (max 20°C on Fri afternoon, min 12°C on Fri morning). Wind will be generally light. | Days 4-6 Weather SummaryMostly dry. Very mild (max 17°C on Sat morning, min 12°C on Sun night). Wind will be generally light. | ||||||||||||||||||||
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 | |
Swell Height Map | |||||||||||||||||||||
Wave Height (m) Direction Period (s) | WSW 10 | WSW 12 | WSW 11 | WSW 14 | WSW 13 | WSW 12 | WSW 11 | WSW 11 | WSW 10 | WSW 10 | WSW 10 | WSW 12 | WSW 11 | WSW 10 | WSW 10 | W 10 | W 9 | W 10 | W 9 | W 10 | W 9 |
Wave Graph | |||||||||||||||||||||
32 | 93 | 46 | 62 | 195 | 322 | 173 | 167 | 158 | 157 | 220 | 353 | 218 | 218 | 473 | 290 | 101 | 158 | 142 | 115 | 60 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | off | cross-off | cross-off | off | cross-on | glassy | cross-off | cross-off | cross-off | glassy | on | on | on | glassy | off | off | cross-off | off | cross-off | cross-off | off |
High Tide | 2:25PM0.89m | 2:50AM1.17m | 3:13PM0.77m | 3:44AM1.09m | 4:28PM0.68m | 5:02AM1.04m | 6:38PM0.66m | 6:34AM1.04m | 8:10PM0.71m | 7:46AM1.10m | 8:53PM0.78m | 8:35AM1.17m | 9:24PM0.86m | ||||||||
Low Tide | 8:08PM0.34m | 9:41AM0.39m | 8:43PM0.43m | 11:08AM0.45m | 9:37PM0.51m | 12:55PM0.45m | 11:22PM0.55m | 2:09PM0.38m | 1:01AM0.52m | 2:53PM0.31m | 2:04AM0.45m | 3:26PM0.24m | 2:49AM0.36m | ||||||||
7:45 | — | — | 7:43 | — | — | 7:41 | — | — | 7:39 | — | — | 7:39 | — | — | 7:37 | — | — | 7:35 | — | — | |
— | 7:37 | — | — | 7:38 | — | — | 7:39 | — | — | 7:39 | — | — | 7:40 | — | — | 7:42 | — | — | 7:42 | — | |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 16 | 15 | 15 | 17 | 16 | 14 | 16 | 20 | 15 | 17 | 15 | 14 | 15 | 16 | 16 | 15 | 15 | 14 | 16 | 16 | 16 |
Feels °C | 15 | 13 | 13 | 15 | 15 | 15 | 15 | 19 | 14 | 15 | 14 | 12 | 14 | 15 | 14 | 11 | 11 | 12 | 14 | 13 | 15 |
Swell 1 Height (m) Direction Period (s) | SW 6 | WSW 12 | SW 6 | SW 7 | WSW 13 | WSW 12 | WSW 11 | WSW 11 | WSW 10 | WSW 10 | WSW 10 | WSW 12 | WSW 11 | WSW 10 | WSW 10 | SW 12 | SW 12 | SW 11 | SW 11 | SW 10 | WSW 6 |
15 | 93 | 94 | 71 | 195 | 322 | 173 | 167 | 158 | 157 | 220 | 353 | 218 | 218 | 473 | 624 | 855 | 606 | 263 | 150 | 20 | |
Swell 2 Height (m) Direction Period (s) | SW 12 | W 10 | WSW 11 | WSW 11 | SW 6 | SW 20 | WSW 7 | SW 6 | SW 6 | SW 16 | SW 13 | NW 13 | NW 13 | NW 13 | SW 14 | W 10 | W 9 | W 10 | W 9 | W 10 | W 9 |
69 | 17 | 46 | 46 | 34 | 15 | 34 | 19 | 8 | 10 | 88 | 7 | 7 | 7 | 51 | 290 | 101 | 158 | 142 | 115 | 60 | |
Swell 3 Height (m) Direction Period (s) | WSW 10 | W 13 | WSW 15 | WSW 14 | NW 11 | W 11 | SW 19 | SW 18 | SW 17 | NW 14 | W 12 | W 19 | W 18 | W 18 | WNW 12 | — | WSW 10 | NW 12 | NW 12 | NW 13 | SW 10 |
32 | 3 | 21 | 62 | 5 | 2 | 14 | 12 | 11 | 8 | 12 | 7 | 6 | 6 | 15 | — | 32 | 6 | 6 | 7 | 23 | |
Wind waves Height (m) Direction Period (s) | — | SW 6 | — | — | — | — | — | — | — | — | — | N 2 | NNW 3 | — | — | — | — | — | — | — | — |
— | 39 | — | — | — | — | — | — | — | — | — | 1 | 3 | — | — | — | — | — | — | — | — | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 6 | 425 | 0 | 0 | 58 | 0 | 0 | 0 | 0 | 0 | 58 | 20 | 1 | 0 | 0 | 0 | 425 | 0 | 0 | 0 | 0 |
Best forecast wave conditions in Santiago | |||||||||||||||||||||
Best forecast wave conditions in Chile | |||||||||||||||||||||
Header Global | |||||||||||||||||||||
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Information about the Isla Negra Surf forecast
The above surf forecast table for Isla Negra provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Isla Negra can be found by selecting the local surf guide option on the grey menu. Our Isla Negra 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 (Isla Negra) 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 Isla Negra 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.
Isla Negra is 19 km (12 miles) from the city of San Antonio. If you plan a holiday in Santiago, look for hotels and other accommodation in San Antonio. San Antonio has rooms for a wide range of budgets as well as car hire and transport links.










