Surf Forecasts:
Isla Negra surf forecast from 4 Sep 2026:
- Best quality surf: Friday 4 Sep, 5AM (local time) - 6ft (1.8m), 13s period, WSW swell with offshore winds.
- Most powerful swell: Friday 4 Sep, 5AM (local time) - 6ft (1.8m), 13s period, WSW swell with 1,169 kJ wave energy.
- Next surfable swell (1★+): Friday 4 Sep, 5AM (local time) - 6ft (1.8m), 13s 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 Friday (Sep 04) at 5AM. The primary swell is predicted to be 1.8m and 13s period. The wind is predicted to be offshore as the swell arrives.
The most powerful waves expected at Isla Negra in the next 16 days are 1.8m 13s and forecast to arrive on Friday (Sep 04) at 5AM. 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 8s period and expected on Friday (Sep 04) at 8PM.
| Wave Type | Time (-04) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 5AM (Fri 4th Sep) | 6ft (1.8m) 13s |
| Best Surf | 5AM (Fri 4th Sep) | 6ft (1.8m) 13s |
| Most Powerful | 5AM (Fri 4th Sep) | 6ft (1.8m) 13s |
Table - best surf conditions forecast for Isla Negra over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let’s take a hard look at what’s on the table for Isla Negra.
Straight up, we’re in for a long, frustrating stretch. The next week looks nearly flat with only tiny, weak pulses. Hold tight – there are a couple of brighter windows later in the forecast, but patience is the name of the game.
The standout morning comes on Thursday, September 10th. Clean, light offshore wind from the S and a 3ft groundswell out of the WSW with a solid 13-second period. The energy reading hits 225 (moderate wave energy), and it’s the best combo we see for a long while. That’ll be your cleanest, most lined-up session of the early period. The water temp is about average for this time of year, nothing wild.
After that, it gets messy again with a lot of small, weak, or blown-out junk. The wind cranks up and the wave heights drop. It’s a real desert until we get to September 14th. That Monday sees some 2ft and 2ft swell, but the wind is onshore from the NW – that’s poor surf and not worth paddling out for.
Our second real highlight lands on Tuesday, September 15th. Morning session shapes up nicely: clean, a 3ft swell from the WSW with a period of 12 seconds, and light cross-off winds from the SSW. The combined energy reads a solid 292 (moderate wave energy). It’s your best chance for a decent wave in the second week. The afternoon sees the same size but the wind bumps up to 12 mph, making it a bit more ordinary.
Further out, Friday September 18th morning brings a bigger push – 5ft out of the WSW at 11 seconds – but wind is up to 12 mph and energy is strong at 439. Could be a bit of a handful and the tide might mess with it. That’s one to watch but no guarantee of perfection.
All in all, Thursday the 10th morning and Tuesday the 15th morning are your windows. The rest is a whole lot of nothing. If you’re a beginner, stick to those cleaner, smaller morning sessions. The bigger stuff on the 18th might be too much for you.
Stay patient, watch the wind, and don’t waste your energy on the flat days.
Rusty.
Short Range ForecastMostly dry. Very mild (max 15°C on Fri afternoon, min 9°C on Thu night). Wind will be generally light. | Days 5-7 Weather SummaryMostly dry. Very mild (max 13°C on Wed afternoon, min 8°C on Mon night). Wind will be generally light. | ||||||||||||||||||
Friday 4 | Saturday 5 | Sunday 6 | Monday 7 | Tuesday 8 | Wednesday 9 | ||||||||||||||
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 13 | WSW 13 | WSW 13 | WSW 13 | WSW 19 | SW 18 | WSW 12 | SW 15 | SW 14 | SW 14 | SW 14 | WSW 5 | WSW 19 | WSW 5 | W 8 | WSW 16 | WSW 12 | NW 12 | WSW 13 |
Wave Graph  | |||||||||||||||||||
 kJ | 1186 | 362 | 261 | 202 | 241 | 0 | 177 | 0 | 0 | 0 | 0 | 5 | 35 | 10 | 1 | 100 | 90 | 6 | 215 |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | off | cross-off | cross-off | off | cross-off | cross-off | off | cross-off | cross | glassy | cross-off | cross-off | off | cross-off | cross-off | off | cross-off | cross-off | glassy |
High Tide | 3:01AM1.19m | 3:33PM0.75m | 4:23AM1.19m | 5:25PM0.71m | 5:52AM1.23m | 7:00PM0.76m | 7:06AM1.32m | 8:02PM0.86m | 8:04AM1.41m | 8:49PM0.97m | 8:53AM1.48m | 9:29PM1.07m | |||||||
Low Tide | 8:04PM0.32m | 10:05AM0.39m | 9:09PM0.39m | 11:50AM0.36m | 10:45PM0.42m | 1:11PM0.26m | 1:17AM0.37m | 2:08PM0.16m | 1:27AM0.28m | 2:52PM0.07m | 2:23AM0.18m | 3:30PM0.00m | 3:12AM0.10m | ||||||
 |  |  | | | | | | | | | | | | |  |  | | | |
 | — | 7:00 | — | — | 6:58 | — | — | 7:56 | — | — | 7:56 | — | — | 7:54 | — | — | 7:52 | — | — |
 | 6:30 | — | 6:30 | — | — | 6:30 | — | — | 7:31 | — | — | 7:32 | — | — | 7:32 | — | — | 7:34 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 12 | 12 | 15 | 13 | 12 | 12 | 11 | 12 | 13 | 12 | 11 | 12 | 10 | 11 | 12 | 11 | 12 | 13 | 12 |
Feels °C | 7 | 7 | 10 | 9 | 8 | 7 | 9 | 10 | 10 | 11 | 8 | 9 | 6 | 8 | 8 | 8 | 9 | 10 | 11 |
Swell 1 Height (m) Direction Period (s) | WSW 13 | WSW 8 | WSW 13 | SW 9 | SW 9 | SW 18 | SW 8 | SW 15 | SW 14 | SW 14 | SW 14 | SW 14 | SW 13 | SW 13 | SW 13 | SW 12 | SW 14 | SW 14 | WSW 13 |
| kJ | 1186 | 235 | 261 | 334 | 249 | 370 | 109 | 891 | 658 | 565 | 422 | 447 | 335 | 286 | 196 | 178 | 164 | 284 | 215 |
Swell 2 Height (m) Direction Period (s) | — | WSW 13 | SW 23 | WSW 13 | SW 12 | SW 12 | SW 16 | — | — | — | — | — | WSW 4 | WSW 5 | SW 17 | WSW 5 | WSW 12 | NW 12 | SW 4 |
| kJ | — | 362 | 21 | 202 | 144 | 116 | 361 | — | — | — | — | — | 7 | 10 | 75 | 17 | 90 | 6 | 4 |
Swell 3 Height (m) Direction Period (s) | — | — | — | SW 21 | WSW 19 | — | WSW 12 | — | — | — | — | — | WSW 19 | SW 18 | W 8 | WSW 16 | NW 13 | — | NW 12 |
| kJ | — | — | — | 116 | 241 | — | 177 | — | — | — | — | — | 35 | 79 | 1 | 100 | 7 | — | 6 |
Wind waves Height (m) Direction Period (s) | — | — | SW 8 | — | — | SW 9 | — | — | — | — | — | WSW 5 | — | — | SW 5 | — | SW 6 | SW 5 | — |
| kJ | — | — | 274 | — | — | 284 | — | — | — | — | — | 5 | — | — | 12 | — | 19 | 29 | — |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 0 | 61 | 450 | 0 | 108 | 289 | 0 | 55 | 289 | 1 | 6 | 108 | 0 | 6 | 425 | 0 | 0 | 6 | 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.
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